The engine management system constantly monitors the input signals from the various sensors in the injection system and compares them with set limit values. If a signal goes outside these limits, the control unit stores a fault code in its memory.
The function of the ignition control system is to control the ignition system of the engine. The control unit constantly monitors the input signals from the various sensors and compares them with set limit values.
There are several different types of diagnosis, fault code reading and fault code tables. On Mercedes cars there are four different diagnostics sockets. These occur in different combinations. Choose the combination of diagnostic sockets about which you require diagnostic information.
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DIAGNOSTICS SOCKET – Ignition control system
Some systems have a separate control unit for ignition. Fault codes can be read from these control units by means of a diode tester. Diagnostics sockets exist in two variants. Choose the combination about which you want information.
Both 16- and 9-way diagnostics sockets
Fault codes are read at the 16-way diagnostics socket. The 16-way socket is located close to the battery, which is on the right-hand side at the bulkhead in the engine compartment. The 9-way socket is located on the left-hand inner panel in the engine compartment close to the ignition control unit.
Both 38- and 9-way diagnostics sockets
Fault codes are read at the 38-way diagnostics socket. The 38-way socket is located in the “E-box” on the right-hand side at the bulkhead in the engine compartment. The 9-way socket is located on the left-hand side in the rear part of the engine compartment. The engine management unit is also located in the “E-box”.
Reading and deleting fault codes on Mercedes with separate ignition control unit, at 16-way diagnostics socket
This is done by reading a blink code at the 16-way socket.
READING FAULT CODES Blink code, 16-way socket
There is only one way to read fault codes from the EZ-K ignition control system with a 16-way diagnostics socket. This is done by using a switch wire (with a normally-open contact) and a diode tester connected to the 16-way diagnostics socket.
1.
Connect the switch wire (normally-open contact) to terminals 1 and 8 of the diagnostics socket.
2.
Connect the + connection of the diode tester to terminal 16 on the diagnostics socket and the - connection to terminal 8 on the diagnostics socket.
3.
Start the engine and let it idle. Increase the engine speed to 3100-3600 RPM for about 8 seconds and let it return to idling. Disconnect the vacuum hose from the EZ-K ignition control unit.
4.
Move the automatic transmission selector lever from P or N to D and back to N . Increase the engine speed to 5000 rpm for at least two seconds and let the engine return to idling. Re-connect the vacuum hose to the EZ-K ignition control unit. Increase the engine speed to 2300 rpm and quickly “floor” the throttle pedal so that the full throttle contact on the throttle butterfly closes. Let the engine return to idling, then close the switch on the switch wire (normally-open contact) for about 4-5 seconds. Open the contact.
5 .
The first fault code now appears on the diode tester. The fault code only appears once and should therefore be noted when it appears. The codes are displayed in an order of priority defined by the control unit. To see the next fault code, close the switch on the switch wire (normally-open contact) again for about 4-5 seconds. The next code is displayed on the diode tester.
6.
To stop fault code readout, switch off the ignition.
7.
Check against fault code table.
Fault Code Flash | Fault Code Description |
01 | No fault found |
02 | Knock control max. retard |
03 | Engine coolant temperature sensor |
04 | Mainfold absolute pressure sensor |
05 | Knock sensor |
06 | Camshaft sensor |
07 | Knock control |
08 | Auto transmission |
09 | Auto transmission |
10 | Data exchange between KE and EZ control units |
11 | Ignition control |
12 | Engine speed signal |
13 | Throttle position switch – full load |
14 | Throttle position switch – idle |
15 | Ignition end stage fault |
17 | Engine speed sensor |
DELETING FAULT CODES
The ignition control unit cannot store fault codes, so when the ignition is switched off, all the codes disappear.
Reading and deleting fault codes on Mercedes with separate ignition control unit, at 38-way diagnostics socket
This is done by reading a blink code at the 38-way socket.
READING FAULT CODES Blink code, 38-way socket
There is only one way to read fault codes from the EZ-K ignition control system with a 38-way diagnostics socket. This is done by using a switch wire (with a normally-open contact) and a diode tester connected to the 38-way diagnostics socket.
1.
Connect the switch wire (normally-open contact) to terminals 1 and 17 of the diagnostics socket.
2.
Connect the + connection of the diode tester to terminal 3 on the diagnostics socket and the - connection to terminal 17 on the diagnostics socket.
3.
Switch on the ignition, close the switch on the switch wire (normally-open contact) for about 2-4 seconds, then open the switch. The control unit now displays blink codes on the diode tester. Each code consists of a number of blinks (flashes); these should be noted. The codes are displayed in an order of priority defined by the control unit. To see the next fault code, close the switch on the switch wire (normally-open contact) again for about 2-4 seconds. The next code is displayed on the diode tester.
To see the fault codes again, switch off the ignition and repeat step 3.
4.
To finish reading fault codes, switch off ignition and disconnect the diode tester and the switch wire (normally-open contact) from the diagnostics socket.
5.
Check against fault code table.
Fault Code Flash | Fault Code Description |
02 | Knock control max. retard |
04 | Mainfold absolute pressure sensor |
05 | Knock sensor |
06 | Camshaft sensor |
07 | Knock control |
08 | Auto transmisson |
09 | Auto transmisson |
11 | Ignition control |
12 | Engine speed signal |
15 | Ignition end stage fault |
16 | Ignition end stage fault |
17 | Engine speed sensor |
18 | Crankshaft position – segments missing on flywheel |
20 | EZ-K control unit |
21 | Mainfold absolute pressure sensor |
26 | Data exchange between LH and EZ control units |
27 | Data exchange between LH and EZ control units |
34 | Ignition fault No. 1 cylinder |
35 | Ignition fault No. 5 cylinder |
36 | Ignition fault No. 4 cylinder |
37 | Ignition fault No. 8 cylinder |
38 | Ignition fault No. 6 cylinder |
39 | Ignition fault No. 3 cylinder |
40 | Ignition fault No. 7 cylinder |
41 | Ignition fault No. 2 cylinder |
DELETING FAULT CODES
To delete existing fault codes after testing/repair, read fault codes again.
To delete existing blink codes, each code must be deleted individually by closing the switch on the switch wire (normally-open contact) for about 6-8 seconds immediately after the fault code was displayed.
DIAGNOSTICS SOCKET - Engine management system
Both 8- and 9-way diagnostics sockets
The 8-way socket is located close to the battery, which is on the right-hand side at the bulkhead in the engine compartment. The 9-way socket is located on the left-hand inner panel in the engine compartment close to the ignition control unit. The engine management unit is usually located behind the battery, in front of the windscreen.
Both 16- and 9-way diagnostics sockets
The 16-way socket is located close to the battery, which is on the right-hand side at the bulkhead in the engine compartment. The 9-way socket is located on the left-hand inner panel in the engine compartment close to the ignition control unit. The engine management unit is usually located behind the battery, in front of the windscreen.
Both 38- and 9-way diagnostics sockets
The 38-way socket is located in the “E-box” on the right-hand side at the bulkhead in the engine compartment. The 9-way socket is located on the left-hand side in the rear part of the engine compartment. The engine management unit is also located in the “E-box”.
9-way diagnostics socket only
The 9-way socket is located on the left-hand inner panel in the engine compartment close to the ignition module.
16-way diagnostics socket only
The 16-way socket is located close to the battery, which is on the right-hand side at the bulkhead in the engine compartment. The engine management unit is usually located on the left-hand inner panel in the engine compartment.
38-way diagnostics socket only
The 38-way socket is located close to the battery, which is on the right-hand side at the bulkhead in the engine compartment. The engine management unit is usually located on the left-hand inner panel in the engine compartment.
Reading and deleting fault codes on Mercedes with 8-way and 9-way diagnostics sockets
This is done by reading a blink code at the 8-way socket or a percent code at the 9-way socket. (see below)
READING FAULT CODES Blink code, 8-way socket
Fault codes are read by using a switch wire (normally-open contact) and a diode tester at the 8-way diagnostics socket.
1.
The ignition must be off.
2.
Connect a switch wire (normally-open contact) between terminal 1 and terminal 3.
3.
Connect the - terminal of the diode tester to terminal 3 and the + terminal to battery plus (+).
4.
Switch on the ignition.
5.
Close the contact for 2-4 seconds. Count the blinks (flashes) of the LED. Note fault codes and compare with the fault code table..
6.
Repeat step 5 to read the next fault code.
7.
Switch off the ignition. Compare with a fault code table.. Correct any faults.
Fault Code | Fault Code Description | |
Flash Code | % Code | |
100% | Lambda sensor (signal) | |
60% | Vehicle speed signal | |
0% | Lambda sensor (signal) | |
1 | No fault found | |
2 | 20% | Throttle position switch – full load |
3 | 30% | Engine coolant temperature sensor |
4 | 40% | Air flow sensor (potentiometer) |
5 | 50% | Lambda sensor (signal) |
7 | 70% | Engine speed signal |
8 | 80% | Barometric pressure sensor |
9 | Pressure actuator | |
10 | 10% | Throttle position switch – idle |
DELETING FAULT CODES Blink
1.
The ignition must be off.
2.
Connect a switch wire (normally-open contact) between terminal 1 and terminal 3.
3.
Connect the - terminal of the diode tester to terminal 3 and the + terminal to battery plus (+).
4.
Switch on the ignition.
5.
Close the contact for 2-4 seconds. Let the LED display the fault code. Close the switch contact for 6-8 seconds to delete the fault code.
6.
Repeat step 5 to delete the next fault code.
7.
Start the engine.
READING FAULT CODES %reading at 9-way socket
Reading fault codes with a cam angle meter or a multimeter capable of reading in % at the 9-way diagnostics socket.
1.
The ignition must be off. Connect a cam angle meter or a multimeter capable of reading in % to terminal 3 of the diagnostics socket, and connect the other terminal to earth.
2.
Switch on the ignition. Check that the meter reads 70%. This indicates that the system has a fault memory.
3.
Start the engine and let it idle.
4.
If the reading varies, no fault codes have been logged.
If the reading DOES NOT vary, note fault codes and compare with the fault code table..
5.
Switch off the ignition.
Fault Code | Fault Code Description | |
Flash Code | % Code | |
100% | Lambda sensor (signal) | |
60% | Vehicle speed signal | |
0% | Lambda sensor (signal) | |
1 | No fault found | |
2 | 20% | Throttle position switch – full load |
3 | 30% | Engine coolant temperature sensor |
4 | 40% | Air flow sensor (potentiometer) |
5 | 50% | Lambda sensor (signal) |
7 | 70% | Engine speed signal |
8 | 80% | Barometric pressure sensor |
9 | Pressure actuator | |
10 | 10% | Throttle position switch – idle |
DELETING FAULT CODES %
1.
Switch off the ignition.
2.
Unplug the connector from the engine management unit wiring harness or disconnect the battery earth cable for 60 seconds.
Note:
Disconnecting the battery may delete the memory of electrical devices (eg radio, clock, etc).
Reading and deleting fault codes on Mercedes with 16-way and 9-way diagnostics sockets
This is done by reading a blink code at the 16-way socket or a percent code at the 9-way socket. (see below)
READING FAULT CODES Blink code, 16-way socket
Fault codes are read by using a switch wire (normally-open contact) and a diode tester at the 16-way diagnostics socket.
1.
The ignition must be off.
2.
Connect a switch wire (normally-open contact) between terminal 1 and terminal 3.
3.
Connect the - terminal of the diode tester to terminal 3 and the + terminal to battery plus (+).
4.
Switch on the ignition.
5.
Close the contact for 2-4 seconds. Count the blinks (flashes) of the LED. Note fault codes and compare with the fault code table..
6.
Repeat step 5 to read the next fault code.
7.
Switch off the ignition. Compare with a fault code table. Correct any faults.
Fault Code Flash | Fault Code Description |
01 | No fault stored |
02 | Throttle position switch – full load |
03 | Engine coolant temperature sensor |
04 | Air flow meter potentiometer |
05 | Lambda sensor (signal) |
07 | Engine speed sensor |
08 | Altitude signal from ignition system |
09 | Pressure actuator |
10 | Throttle position switch – idle |
11 | Secondary air pump |
12 | Pressure signal from ignition system |
13 | Intake air temperature sensor |
14 | Vehicle speed sensor |
16 | EGR system |
17 | Lambda sensor (signal) |
18 | Idle speed control |
22 | Lambda sensor (heater) |
23 | EVAP canister purge solenoid valve |
25 | Cold start valve |
27 | Data exchange between KE and EZ control units |
28 | Engine coolant temperature sensor |
29 | Engine coolant temperature sensor |
31 | Intake air temperature sensor |
32 | MKV resistor |
34 | Engine coolant temperature sensor |
DELETING FAULT CODES Blink
1.
The ignition must be off.
2.
Connect a switch wire (normally-open contact) between terminal 1 and terminal 3.
3.
Connect the - terminal of the diode tester to terminal 3 and the + terminal to battery plus (+).
4.
Switch on the ignition.
5.
Close the contact for 2-4 seconds. Let the LED display the fault code. Close the switch contact for 6-8 seconds to delete the fault code.
6.
Repeat step 5 to delete the next fault code.
7.
Start the engine.
READING FAULT CODES %reading at 9-way socket
Reading fault codes with a cam angle meter or a multimeter capable of reading in % at the 9-way diagnostics socket. Fault codes are read either with the ignition on or with the engine idling .
With ignition on
1.
The ignition must be off. Connect a cam angle meter or a multimeter capable of reading in % to terminal 3 of the diagnostics socket, and connect the other terminal to earth.
2.
Switch on the ignition.
3.
Note fault codes. Compare with a fault code table.
4.
Switch off the ignition.
With engine idling
1.
The ignition must be off. Connect a cam angle meter or a multimeter capable of reading in % to terminal 3 of the diagnostics socket, and connect the other terminal to earth.
2.
Start the engine and let it idle.
3.
If the reading varies, no fault codes have been logged.
If the reading DOES NOT vary, note fault codes and compare with the fault code table.
4.
Switch off the ignition.
Fault Code Flash | Fault Code Description |
01 | No fault stored |
02 | Throttle position switch – full load |
03 | Engine coolant temperature sensor |
04 | Air flow meter potentiometer |
05 | Lambda sensor (signal) |
07 | Engine speed sensor |
08 | Altitude signal from ignition system |
09 | Pressure actuator |
10 | Throttle position switch – idle |
11 | Secondary air pump |
12 | Pressure signal from ignition system |
13 | Intake air temperature sensor |
14 | Vehicle speed sensor |
16 | EGR system |
17 | Lambda sensor (signal) |
18 | Idle speed control |
22 | Lambda sensor (heater) |
23 | EVAP canister purge solenoid valve |
25 | Cold start valve |
27 | Data exchange between KE and EZ control units |
28 | Engine coolant temperature sensor |
29 | Engine coolant temperature sensor |
31 | Intake air temperature sensor |
32 | MKV resistor |
34 | Engine coolant temperature sensor |
DELETING FAULT CODES %
1.
Switch off the ignition.
2.
Unplug the connector from the engine management unit wiring harness or disconnect the battery earth cable for 60 seconds.
Note:
Disconnecting the battery may delete the memory of electrical devices (eg radio, clock, etc).
Reading and deleting fault codes on Mercedes with 38-way and 9-way diagnostics sockets
This is done by reading a blink code at the 38-way socket or a percent code at the 9-way socket. (see below)
READING FAULT CODES Blink code, 38-way socket
Fault codes are read by using a switch wire (normally-open contact) and a diode tester at the 38-way diagnostics socket.
1.
The ignition must be off.
2.
Connect a switch wire (normally-open contact) between terminal 1 and terminal 4.
3.
Connect the + terminal of the diode tester to terminal 3 and the - terminal to terminal 4.
4.
Switch on the ignition.
5.
Close the contact for 2-4 seconds. Count the blinks (flashes) of the LED. Note fault codes and compare with the fault code table.
6.
Repeat step 5 to read the next fault code.
7.
Switch off the ignition. Compare with a fault code table. Correct any faults.
Fault Code Flash | Fault Code Description |
1 | No fault found |
2 | Engine coolant temperature sensor |
3 | Engine coolant temperature sensor |
4 | Air flow sensor (hot wire) |
6 | CO adjuster |
7 | Engine speed signal |
8 | Cylinder identification |
9 | Starter signal |
10 | Throttle position switch |
11 | Secondary air pump |
12 | Air flow sensor (hot wire) – burn-off inoperative |
13 | Intake air temperature sensor |
15 | Exhaust gas temperature sensor |
17 | CAN signal (communication between system computers) |
18 | CAN signal (communication between system computers) |
20 | CAN signal (communication between system computers) |
21 | Lambda sensor (signal) |
22 | Lambda sensor (heater) |
23 | EVAP canister purge solenoid valve |
24 | Variable camshaft adjustment |
25 | Variable camshaft adjustment |
26 | Auto transmission |
27 | Injectors |
28 | MKV coding |
29 | 1 gear relay |
30 | Immobiliser system fault |
DELETING FAULT CODES Blink
1.
The ignition must be off.
2.
Connect a switch wire (normally-open contact) between terminal 1 and terminal 4.
3.
Connect the + terminal of the diode tester to terminal 3 and the - terminal to terminal 4.
4.
Switch on the ignition.
5.
Close the contact for 2-4 seconds. Let the LED display the fault code. Close the switch contact for 6-8 seconds to delete the fault code.
6.
Repeat step 5 to delete the next fault code.
7.
Start the engine.
READING FAULT CODES %reading at 9-way socket
Reading fault codes with a cam angle meter or a multimeter capable of reading in % at the 9-way diagnostics socket. Fault codes are read either with the ignition on or with the engine idling .
With ignition on
1.
The ignition must be off. Connect a cam angle meter or a multimeter capable of reading in % to terminal 3 of the diagnostics socket, and connect the other terminal to earth.
2.
Switch on the ignition.
3.
Note fault codes. Compare with a fault code table.
4.
Switch off the ignition.
With engine idling
1.
The ignition must be off. Connect a cam angle meter or a multimeter capable of reading in % to terminal 3 of the diagnostics socket, and connect the other terminal to earth.
2.
Start the engine and let it idle.
3.
If the reading varies, no fault codes have been logged.
If the reading DOES NOT vary, note fault codes and compare with the fault code table.
4.
Switch off the ignition.
Fault Code Flash | Fault Code Description |
1 | No fault found |
2 | Engine coolant temperature sensor |
3 | Engine coolant temperature sensor |
4 | Air flow sensor (hot wire) |
6 | CO adjuster |
7 | Engine speed signal |
8 | Cylinder identification |
9 | Starter signal |
10 | Throttle position switch |
11 | Secondary air pump |
12 | Air flow sensor (hot wire) – burn-off inoperative |
13 | Intake air temperature sensor |
15 | Exhaust gas temperature sensor |
17 | CAN signal (communication between system computers) |
18 | CAN signal (communication between system computers) |
20 | CAN signal (communication between system computers) |
21 | Lambda sensor (signal) |
22 | Lambda sensor (heater) |
23 | EVAP canister purge solenoid valve |
24 | Variable camshaft adjustment |
25 | Variable camshaft adjustment |
26 | Auto transmission |
27 | Injectors |
28 | MKV coding |
29 | 1 gear relay |
30 | Immobiliser system fault |
DELETING FAULT CODES %
1.
Switch off the ignition.
2.
Unplug the connector from the engine management unit wiring harness or disconnect the battery earth cable for 60 seconds.
Note:
Disconnecting the battery may delete the memory of electrical devices (eg radio, clock, etc).
Reading and deleting fault codes on Mercedes with 9-way diagnostics socket
This is done by reading a percent code at the 9-way socket.
READING FAULT CODES %reading at 9-way socket
Reading fault codes with a cam angle meter or a multimeter capable of reading in % at the 9-way diagnostics socket.
1.
The ignition must be off. Connect a cam angle meter or a multimeter capable of reading in % to terminal 3 of the diagnostics socket, and connect the other terminal to earth.
2.
Switch on the ignition. Check that the meter reads 70%. This indicates that the system has a fault memory.
3.
Start the engine and let it idle.
4.
If the reading varies, no fault codes have been logged.
If the reading DOES NOT vary, note fault codes and compare with the fault code table.
5.
Switch off the ignition.
Fault Code Percentage % | Fault Code Description |
0% | Lambda sensor (signal) – cat cars |
0% | Diagnosis socket – Non cat cars |
10% | Throttle position switch – idle |
20% | Throttle position switch – full load |
30% | Engine coolant temperature sensor |
40% | Air flow meter potentiometer |
50% | Lambda sensor (signal) – cat cars |
60% | Vehicle speed sensor |
70% | Engine speed signal |
80% | Intake air temperatur sensor |
100% | Lambda sensor (signal) – cat cars |
100% | No ground or voltage at ECM – non cat cars |
DELETING FAULT CODES %
1.
Switch off the ignition.
2.
Unplug the connector from the engine management unit wiring harness or disconnect the battery earth cable for 60 seconds.
Note:
Disconnecting the battery may delete the memory of electrical devices (eg radio, clock, etc).
Reading and deleting fault codes on Mercedes with 16-way diagnostics socket
This is done by reading a blink code at the 16-way socket.
READING FAULT CODES Blink code, 16-way socket
Fault codes are read by using a switch wire (normally-open contact) and a diode tester at the 16-way diagnostics socket.
1.
The ignition must be off.
2.
Connect a switch wire (normally-open contact) between terminal 1 and terminal 8.
3.
Connect the - terminal of the diode tester to terminal 8 and the + terminal to terminal 16.
4.
Switch on the ignition.
5.
Close the contact for 2-4 seconds. Count the blinks (flashes) of the LED. Note fault codes and compare with the fault code table.
6.
Repeat step 5 to read the next fault code.
7.
Switch off the ignition. Compare with a fault code table. Correct any faults.
Fault Code Flash | Fault Code Description |
1 | No fault stored |
2 | Engine coolant temperature sensor |
3 | Intake air temperature sensor |
4 | Mainfold absolute pressure sensor |
5 | Throttle position switch – idle |
6 | Throttle position sensor |
7 | Throttle valve actuator potentiometer |
8 | Idle speed control |
9 | Lambda sensor (signal) |
11 | Lambda sensor (heater) |
13 | Lambda sensor (signal) |
14 | Injectors – 4cyl. Nos. 1 & 4 |
15 | Injectors – 4cyl. Nos. 2 & 3 |
20 | Lambda sensor (signal) |
21 | Ignition primary circuit – cylinder 1 & 4 |
22 | Ignition primary circuit – cylinder 2 & 3 |
24 | Engine speed sensor |
26 | Octane encoding |
27 | Engine speed sensor |
28 | Vehicle speed sensor |
29 | Intake mainfold preheating relay |
30 | Fuel pump circuit |
31 | CO adjuster |
36 | EVAP canister purge solenoid valve |
37 | Auto transmission |
49 | Battery voltage supply to ECM |
DELETING FAULT CODES
There are two ways of deleting fault codes: by using a switch wire (normally-open contact) and a diode tester, or by disconnecting the battery earth cable.
Method 1
1.
The ignition must be off.
2.
Connect a switch wire (normally-open contact) between terminal 1 and terminal 8.
3.
Connect the - terminal of the diode tester to terminal 8 and the + terminal to terminal 16.
4.
Switch on the ignition.
5.
Close the contact for 2-4 seconds, except Bosch ECM –8/93.
Close the contact for 5-6 seconds, Bosch ECM –8/93 only.
6.
Let the LED display the fault code.
7.
Close the contact for 6-8 seconds, except Bosch ECM –8/93.
Close the contact for 8-9 seconds, Bosch ECM –8/93 only.
8.
Repeat steps 5-7 to delete all stored fault codes.
9.
After deleting fault codes, switch off the ignition, wait for two seconds, switch on the ignition, wait for 10 seconds.
10.
Start the engine.
Method 2
1.
The ignition must be off.
2.
Disconnect the battery earth cable.
Note:
Disconnecting the battery may delete the memory of electrical devices (eg radio, clock, etc).
Reading and deleting fault codes on Mercedes with 38-way diagnostics socket
This is done by reading a blink code at the 38-way socket.
READING FAULT CODES Blink code, 38-way socket
Fault codes are read by using a switch wire (normally-open contact) and a diode tester at the 38-way diagnostics socket.
1.
The ignition must be off.
2.
Connect a switch wire (normally-open contact) between terminal 1 and terminal 4.
3.
Connect the + terminal of the diode tester to terminal 3 and the - terminal to terminal 4.
4.
Switch on the ignition.
5.
Close the contact for 2-4 seconds. Count the blinks (flashes) of the LED. Note fault codes and compare with the fault code table.
6.
Repeat step 5 to read the next fault code.
7.
Switch off the ignition. Compare with a fault code table. Correct any faults.
Fault Code Flash | Fault Code Description |
01 | No fault stored |
02 | Engine coolant temperature sensor |
03 | Intake air temperature sensor |
04 | Mainfold absolute pressure sensor |
05 | Throttle position switch – idle |
06 | Throttle position sensor |
07 | Idle speed control - position sensor |
08 | Idle speed control |
09 | Lambda sensor (signal) |
10 | Lambda sensor 2 |
11 | Lambda sensor (heater) |
12 | Lambda sensor heating |
13 | Lambda control |
14 | Injectors – 4cyl. Nos. 1 & 3 |
15 | Injectors – 4cyl. Nos. 2 & 4 |
16 | Injector – cyl. 3 |
17 | Injector – cyl. 4 |
18 | Injector – cyl. 5 |
19 | Injector – cyl. 6 |
20 | Lambda sensor (signal) |
21 | Ignition primary circuit – cylinder 1 & 4 |
22 | Ignition primary circuit – cylinder 2 & 3 |
24 | Engine speed sensor |
25 | Camshaft position sensor |
26 | MKV coding |
27 | Tachometer circuit |
28 | Vehicle speed sensor |
29 | Intake mainfold preheating relay |
30 | Fuel pump circuit |
32 | Knock sensor 1 or 2 |
33 | Knock control |
34 | ECU faulty |
35 | Secondary air pump/valve |
36 | EVAP canister purge solenoid valve |
37 | Auto transmission |
38 | Camshaft adjustment |
39 | Exhaust gas recirculation EGR |
40 | Gear overload protection switch |
41 | CAN |
42 | CAN – no communication to diagnostic module or ASR |
43 | No starter signal |
44 | Temperature sensor cat converter |
45 | Fuel shutdown |
46 | Valve for intake manifold switchover |
49 | ECM power supply |
50 | Faulty ECU |
DELETING FAULT CODES
There are two ways of deleting fault codes: by using a switch wire (normally-open contact) and a diode tester, or by disconnecting the battery earth cable.
Method 1
1.
The ignition must be off.
2.
Connect a switch wire (normally-open contact) between terminal 1 and terminal 4.
3.
Connect the + terminal of the diode tester to terminal 3 and the - terminal to terminal 4.
4.
Switch on the ignition.
5.
Close the contact for 2-4 seconds, except Bosch ECM –8/93.
Close the contact for 5-6 seconds, Bosch ECM –8/93 only.
6.
Let the LED display the fault code.
7.
Close the contact for 6-8 seconds, except Bosch ECM –8/93.
Close the contact for 8-9 seconds, Bosch ECM –8/93 only.
8.
Repeat steps 5-7 to delete all stored fault codes.
9.
After deleting fault codes, switch off the ignition, wait for two seconds, switch on the ignition, wait for 10 seconds.
10.
Start the engine.
Method 2
1.
The ignition must be off.
2.
Disconnect the battery earth cable.
Note:
Disconnecting the battery may delete the memory of electrical devices (eg radio, clock, etc).