Fault Codes For VAUXHALL-OPEL GM Multec

 The warning lamp will illuminate when the ignition is switched on, but as soon as the engine is started the warning lamp will go out. If the warning lamp stays on or comes on while the engine is running, then the ecu has detected a fault. If the ecu detects a serious fault then the ecu will then switch to an emergency programme which will allow the vehicle to be driven to a garage, so that the fault can be cured.

 When pin D8 off the ecu is grounded or the diagnostic socket pins A and B connected together by a wire, then the fault codes will be displayed from the fault code light as flashes, e.g. fault code 12 displays as one flash, pause, then two flashes.

 To erase the fault code, turn the ignition on/off for 25 times, if this is unsuccessful then disconnect the battery earth lead for at least one minute. The disadvantage for removing the earth lead is that it will erase the memory from other electronic units, eg. security coded radio.
 

Fault Code

Associated Component/Cause Of Fault
12

Diagnosis Initiated
13

Lambda Sensor (Open Circuit)
14

Coolant Temperature Sensor (Voltage Low)

15

Coolant Temperature Sensor (Voltage High)

16

Knock Signal Circuit
18

Knock Control System
19

Incorrect Rpm Signal
21

Throttle Position Sensor (Voltage High)
22

Throttle Position Sensor (Voltage Low)
24

Speed Sensor (No Signal)
25

Injector Valve (Voltage Low)
29

Fuel Pump Relay (Voltage Low)
32

Fuel Pump Relay (Voltage High)
33

Map Sensor (Voltage High)
34

Map Sensor (Voltage Low)
35

Stepper Motor (No Idle Speed Control)
41

EST Line Coil Cylinder 2 & 3 (Voltage High)
42

EST Line Coil Cylinder 1 & 4 (Voltage High)
43

Linear EGR System
44

Lambda Sensor (Mixture Too Weak)
45

Lambda Sensor (Mixture Too Rich)
47

Linear EGR Position
49

Battery Voltage High
51

Electronic Control Unit (Memory Failure)
55

Electronic Control Unit
63

EST Line Coil Cylinder 2 & 3 (Voltage Low)
64

EST Line Coil Cylinder 1 & 4 (Voltage Low)
75

Torque Control (Voltage Low)
76

Torque Control (Continuous)
81

Injector Valve (Voltage High)
93

Quad Driver Module