General information


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.

9-way

8-way

16-way

38-way

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).