Faultcodes Mitsubishi m88-92


General information

The engine control system constantly monitors the input signals from the various sensors in the injection system and compares them with defined limit values. If a signal violates these limits, the control unit stores the fault code in the memory. The fault codes can be read out via the engine lamp or via LEDs on the control unit.

The diagnostics socket

The diagnostics socket is located to the left of the central console or to the left of the steering column.

If a voltmeter is connected between terminals 1 and 12, the pointer will deflect in accordance with the pattern shown in the fault code table.

The clearest results will be obtained by using a circuit tester or an LED with a series resistor..

Apperance of the fault codes

Fault code

Output signal

Description

None

ECU fault

12

Öpen circuit or short circuit in the air flow sensor circuit

13

Öpen circuit or short circuit in the air inlet temperature sensor circuit

14

Öpen circuit or short circuit in the throttle potentiometer circuit

15

Öpen circuit or short circuit in the cylinder identification sensor circuit

21

Öpen circuit or short circuit in the coolant temperature sensor circuit

22

No change in voltage on the revolution sensor signal

23

No change in voltage on the cylinder identification signal

24

No change in voltage on the road speed sensor signal

25

Öpen circuit or short circuit in the athmospheric pressure sensor circuit

31

Öpen circuit in the knock sensor circuit

41

Öpen circuit in the fuel injector circuit

44

Fuelpump

0

Normal, no fault code

   

Fault code list

0

No fault in the system

11

Lambda sensor front

12

Air inlet sensor

13

Air inlet temperature sensor

14

Throttle potentiometer

16

Power supply to ECU

18

+50 –signal

21

Coolant temperature sensor

22

Revolution sensor (crankshaft)

23

Cylinder identification sensor (camshaft position sensor)

24

Road speed sensor

25

Altitude sensor (ATM)

26

Idle switch

27

Power steering switch

28

AC-switch

31

Knock sensor

36

Ignition timing – control signal (not saved)

41

Injection valve

44

Ignition coil or/and ignition output stage

45

ISC (stepper) motor position

49

AC relay

54

Immobilizer

59

Lambda sensor (rear)

64

Alternator FR-terminal

Reading fault codes

If a voltmeter is connected between terminals 1 and 12, the pointer will deflect in accordance with the pattern shown in the fault code table.

The clearest results will be obtained by using a circuit tester or an LED with a series resistor.

Long blinks mean tens and short blinks mean units.

Deleting fault codes

Correct the faults in the system before you delete the fault codes.

1.

Disconnect the negative terminal from the battery for at least 30 seconds

  

2.

Connect the negative terminal

  

3.

Start the engine and warm it up thoroughly

  

4.

Check that the fault codes have been deleted