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The ecu 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.

To activate the fault codes connect a wire to A and B of the diagnostic plug (10 pin version), then the fault codes will be displayed from the fault code light as flashes, eg. 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.

Vauxhall Fault Codes - GM Multec SPi

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)

28
Fuel Pump Relay (Contact Problem)

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)

46
EST Lines (Voltage High)

47
Linear EGR Position

49
Battery Voltage High

51
Electronic Control Unit (Memory Failure)

54
Idle CO Potentiometer

55
Electronic Control Unit

63
EST Line Coil Cylinder 2 & 3 (Voltage Low)

64
EST Line Coil Cylinder 1 & 4 (Voltage Low)

69
Air Temperature Sensor (Voltage Low)

71
Air Temperature Sensor (Voltage High)

75
Torque Control (Voltage Low)

76
Torque Control (Continuous)

81
Injector Valve (Voltage High)

93
Quad Driver Module


Vauxhall Fault Codes - GM Multec MPi

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

17
Fuel Injector Circuit(s)

18
Knock Filter Module

19
Incorrect RPM Signal

21
Throttle Position Sensor (Voltage High)

22
Throttle Position Sensor (Voltage Low)

24
Speed Sensor (No Signal)

28
Fuel Pump Relay (Contact Problem)

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)

46
EST Lines (Voltage High)

47
Linear EGR Position

49
Battery Voltage High

51
Electronic Control Unit (Memory Failure)

52
Secondary Air Pump Relay (Voltage Low)

53
Secondary Air Pump Relay (Voltage High)

55
Electronic Control Unit

56
Air Control Solenoid (Voltage Low)

57
Air Control Solenoid (Voltage High)

61
Fuel Tank Vent Valve (Voltage Low)

62
Fuel Tank Vent Valve (Voltage High)

63
EST Line Coil Cylinder 2 & 3 (Voltage Low)

64
EST Line Coil Cylinder 1 & 4 (Voltage Low)

66
Throttle Position Sensor (Hose Broken)

67
Hot Wire Meter (Out Of Range)

68
Hot Wire Meter (Incorrect Frequency)

69
Air Temperature Sensor (Voltage Low)

71
Air Temperature Sensor (Voltage High)

72
EST Lines (Open Circuit)

75
Torque Control (Voltage Low)

76
Torque Control (Continuous)

81
Injector Valve (Voltage High)

83
Immobiliser (No or Wrong Code)

84
Immobiliser (No Signal)

85
Immobiliser (Wring Signal)

87
Air Conditioning Cutoff Relay (Voltage Low)

88
Air Conditioning Cutoff Relay (Voltage High)

92
Camshaft Sensor (Hall Sensor Circuit)

93
Quad Driver Module


Vauxhall Fault Codes - Bosch And Simtec MPi

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 Sensor 1 (No Voltage Change)

17
Knock Sensor 2 (No Voltage Change)

18
Knock Control Unit (No Signal)

19
Crankshaft Sensor (Incorrect Signal)

21
Throttle Position Sensor (Voltage High)

22
Throttle Position Sensor (Voltage Low)

23
Knock Control Module

24
Vehicle Speed Sensor (No Signal)

25
Injector Valve 1 (Voltage High)

26
Injector Valve 2 (Voltage High)

27
Injector Valve 3 (Voltage High)

28
Injector Valve 4 (Voltage High)

29
Injector Valve 5 (Voltage High)

31
Crankshaft Sensor (No Signal)

32
Injector Valve 6 (Voltage High)

33
EGR Valve (Voltage Low)

34
EGR Valve (Voltage High)

35
Idle Speed Control Valve

37
Fault Code Light (Voltage Low)

38
Lambda Sensor (Voltage Low)

39
Lambda Sensor (Voltage High)

41
Vehicle Speed Sensor (Voltage Low)

42
Vehicle Speed Sensor (Voltage High)

44
Lambda Sensor (Weak Mixture)

45
Lambda Sensor (Rich Mixture)

46
Air Pump Relay (Voltage High)

47
Air Pump Relay (Voltage Low)

48
Battery Voltage Low

49
Battery Voltage High

51
Electronic Control Unit (Hardware Failure)

52
Fault Code Light (Voltage High)

53
Fuel Pump Relay (Voltage Low)

54
Fuel Pump Relay (Voltage High)

55
Electronic Control Unit (Hardware Failure)

56
Idle Air Control (Voltage High)

57
Idle Air Control (Voltage Low)

59
Inlet Manifold Valve 1 (Voltage High)

61
Fuel Tank Vent Valve (Voltage Low)

62
Fuel Tank Vent Valve (Voltage High)

63
Inlet Manifold Valve 1 (Voltage High)

65
Idle Co Potentiometer (Voltage Low)

66
Idle Co Potentiometer (Voltage High)

67
Throttle Valve Switch

68
Idle Speed Switch (Not Opening)

69
Air Temperature Sensor (Voltage Low)

71
Air Temperature Sensor (Voltage High)

72
Throttle Valve Switch (Not Opening)

73
Air Flow Sensor (Voltage Low)

74
Air Flow Sensor (Voltage High)

75
Auto Transmission Torque Control (Voltage Low)

76
Auto Transmission Torque Control (Ignition Retard Long)

79
Traction Control (Incorrect Ignition/Injection Cut-Off)

81
Injector Valve 1 (Voltage Low)

82
Injector Valve 2 (Voltage Low)

83
Injector Valve 3 (Voltage Low)

84
Injector Valve 4 (Voltage Low)

85
Injector Valve 5 (Voltage Low)

86
Injector Valve 6 (Voltage Low)

87
Air Conditioning Cutoff Relay (Voltage Low)

88
Air Conditioning Cutoff Relay (Voltage Low)

89
Lambda Sensor Heater (Voltage Low)

91
Lambda Sensor Heater (Voltage High)

92
Camshaft Sensor (Incorrect Signal)

93
Hall Effect Sender (Voltage Low)

94
Hall Effect Sender (Voltage High)

97
Traction Control (Incorrect Signal)

98
Lambda Sensor (Open Circuit)

113
Boost Control (Out Of Range)

114
Boost Pressure Idle (Above Upper Limit)

115
Boost Pressure Full (Below Upper Limit)

116
Boost Pressure (Above Upper Limit)

117
Waste Gate Valve (Voltage Low)

118
Waste Gate Valve (Voltage High)

121
Lambda Sensor 2 (Weak Mixture)

122
Lambda Sensor 2 (Rich Mixture)

123
Inlet Manifold Valve 1 (Blocked)

124
Inlet Manifold Valve 2 (Blocked)

132
EGR Valve (Incorrect Signal)

133
EGR Valve 2 (Voltage High)

134
EGR Valve 2 (Voltage Low)

135
Fault Code Light

136
Electronic Control Unit

137
Electronic Control Unit

141
Secondary Air Pump (Not Enough Air)

142
Secondary Air Pump (Air Without Pump)

143
Immobiliser Function In Ecu (No Or Incorrect Signal)

144
No Immobiliser Signal Received

145
Incorrect Immobiliser Signal Received

(Donated by Tom Gowlett)
 
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