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Trouble code identification

Flash

type

Fault location

Probable cause

12

Start and end of diagnosis - some models

-

10

Engine control module (ECM) - coding

ECM incorrectly programmed

13

Heated oxygen sensor (HO2S)/oxygen sensor (O2S) -
open circuit

Wiring, HO2S/O2S, ECM

14

Engine coolant temperature (ECT) sensor - voltage
low

Wiring short to earth, ECT sensor, ECM

15

Engine coolant temperature (ECT) sensor - voltage
high

Wiring short to positive, ECT sensor, ECM

16

Knock sensor (KS) 1 - signal

Wiring, KS

17

Knock sensor (KS) 2 - signal

Wiring, KS

18

Engine control module (ECM) - KS control

Internal KS control failure

19

Engine speed (RPM) sensor - incorrect signal

Wiring, RPM sensor, reluctor ring, ECM

21

Throttle position (TP) sensor - voltage high

Wiring short to positive, TP sensor, ECM

22

Throttle position (TP) sensor - voltage low

Wiring short to earth, TP sensor, ECM

23

Knock sensor (KS) - KS control

ECM

24

Vehicle speed sensor (VSS) - no signal

Wiring, VSS, ECM

25

Injector 1 - except Motronic M1.5 - voltage high

Wiring short to positive, injector, ECM

25

Injectors - Motronic M1.5 - voltage high

Wiring short to positive, injectors, ECM

26

Injector 2 - voltage high

Wiring short to positive, injector, ECM

27

Injector 3 - voltage high

Wiring short to positive, injector, ECM

28

Injector 4 - voltage high

Wiring short to positive, injector, ECM

29

Injector 5 - voltage high

Wiring short to positive, injector, ECM

31

Engine speed (RPM) sensor - no signal

Wiring, RPM sensor, engine not running

32

Injector 6 - voltage high

Wiring short to positive, injector, ECM

33

Exhaust gas recirculation (EGR) solenoid - voltage low

Wiring open circuit/short to earth, EGR solenoid

34

Exhaust gas recirculation (EGR) solenoid - voltage
high

Wiring short to positive, EGR solenoid

37

Engine control module (ECM) - MIL control

Wiring open circuit/short to earth, ECM

38

Heated oxygen sensor (HO2S)/oxygen sensor (O2S) -
voltage low

Wiring short to earth, ECM

39

Heated oxygen sensor (HO2S)/oxygen sensor (O2S) -
voltage high

Wiring short to positive, ECM

41

First gear position switch - voltage low

Wiring short to earth, first gear position switch

42

First gear position switch - voltage high

Wiring short to positive, first gear position switch

44

Heated oxygen sensor (HO2S)/oxygen sensor (O2S) -
weak mixture

Wiring, ECT/IAT sensor, MAF/VAF sensor, CTP switch, fuel
system, ECM

45

Heated oxygen sensor (HO2S)/oxygen sensor (O2S) -
rich mixture

Wiring, ECT/IAT sensor, MAF/VAF sensor, CTP switch, fuel
system, ECM

46

Secondary air injection (AIR) pump relay - voltage low

Wiring open circuit/short to earth, fuse, AIR pump relay, AIR
solenoid, AIR pump

Manufacturer: Opel/Vauxhall

Model: Omega-B 2,5

Engine code: X25XE

Output: 125 (170) 6000

Tuned for: R-Cat

Year: 1994-00

© Autodata Limited 2007

2008-07-12

V6.410-

47

Secondary air injection (AIR) pump relay - voltage high

Wiring open circuit/short to positive, fuse, AIR pump relay,
AIR solenoid, AIR pump

48

Battery supply voltage - low

Wiring, battery, ECM relay, ECM

49

Battery supply voltage - high

Alternator, regulator

51

Engine control module (ECM) - incorrect programming

Wiring, ECM

52

Engine control module (ECM) - MIL control

Wiring short to positive, ECM

53

Fuel pump relay - voltage low

Wiring short to earth, fuel pump relay, fuel pump, ECM

54

Fuel pump relay - voltage high

Wiring short to positive, fuel pump relay, fuel pump, ECM

55

Engine control module (ECM) - defective

ECM

56

Idle air control (IAC) valve - voltage high

Wiring short to positive, IAC valve, ECM

57

Idle air control (IAC) valve - voltage low

Wiring short to earth, IAC valve, ECM

61

Evaporative emission (EVAP) canister purge valve -
voltage low

Wiring short to earth, EVAP canister purge valve, ECM

62

Evaporative emission (EVAP) canister purge valve -
voltage high

Wiring short to positive, EVAP canister purge valve, ECM

63

Intake manifold air control solenoid - voltage high

Wiring short to positive, intake manifold air control solenoid,
ECM

65

Mixture adjustment resistor - voltage low

Wiring short to earth, ECM

66

Mixture adjustment resistor - voltage high

Wiring short to positive, ECM

67

Closed throttle position (CTP) switch - voltage low

Wiring, CTP switch, ECM

69

Intake air temperature (IAT) sensor - voltage low

Wiring short to earth, IAT sensor, ECM

71

Intake air temperature (IAT) sensor - voltage high

Wiring short to positive, IAT sensor, ECM

72

Wide open throttle (WOT) switch - voltage low

Wiring short to earth, WOT switch, ECM

73

Mass air flow (MAF) sensor/volume air flow (VAF)
sensor - voltage low

Wiring short to earth, MAF/VAF sensor, ECM

74

Mass air flow (MAF) sensor/volume air flow (VAF)
sensor - voltage high

Wiring short to positive, MAF/VAF sensor, ECM

75

AT torque control, signal - voltage low

Wiring open circuit

76

AT torque control, signal - continuous

Wiring, ECM, TCM

79

Traction control - signal voltage low

Wiring, traction control module

81

Injector 1 - except Motronic M1.5 - voltage low

Wiring short to earth, injector, ECM

81

Injectors - Motronic M1.5 - voltage low

Wiring short to earth, injectors, ECM

82

Injector 2 - voltage low

Wiring short to earth, injector, ECM

83

Injector 3 - voltage low

Wiring short to earth, injector, ECM

84

Injector 4 - voltage low

Wiring short to earth, injector, ECM

85

Injector 5 - voltage low

Wiring short to earth, injector, ECM

86

Injector 6 - voltage low

Wiring short to earth, injector, ECM

87

AC control signal - voltage low

Wiring short to earth, AC cut-off relay, ECM

88

AC control signal - voltage high

Wiring short to positive, AC cut-off relay, ECM

91

Oxygen sensor heater - voltage high

Wiring short to positive, ECM

93

Camshaft position (CMP) sensor - voltage low

Wiring short to earth, CMP sensor

94

Camshaft position (CMP) sensor - voltage high

Wiring short to positive, CMP sensor

95

Fuel pressure regulator control solenoid - voltage low

Wiring short to earth, fuel pressure regulator control solenoid

96

Fuel pressure regulator control solenoid - voltage high

Wiring short to positive, fuel pressure regulator control
solenoid

97

Traction control - signal voltage high

Wiring, traction control module

98

Oxygen sensor heater - voltage low

Wiring short to earth, ECM

113

Turbocharger (TC) pressure - out of limits

Wiring, TC, TC wastegate regulating valve, ECM

114

Turbocharger (TC) pressure - idling control limit
exceeded

Wiring, TC wastegate regulating valve, ECM

115

Turbocharger (TC) pressure - full load control limit not
reached

Turbocharger, ECM

116

Turbocharger (TC) pressure - full load control limit
exceeded

Wiring, TC wastegate regulating valve, ECM

Manufacturer: Opel/Vauxhall

Model: Omega-B 2,5

Engine code: X25XE

Output: 125 (170) 6000

Tuned for: R-Cat

Year: 1994-00

© Autodata Limited 2007

2008-07-12

V6.410-

117

Turbocharger (TC) wastegate regulating valve -
voltage low

Wiring short to earth, TC wastegate regulating valve, ECM

118

Turbocharger (TC) wastegate regulating valve -
voltage high

Wiring short to positive, TC wastegate regulating valve, ECM

119

Manifold absolute pressure (MAP) sensor -
range/performance problem

Wiring, MAP sensor, air leak, hose blocked

125

Manifold absolute pressure (MAP) sensor, signal -
below lower limit

Wiring, MAP sensor, intake system

126

Manifold absolute pressure (MAP) sensor, signal -
above upper limit

Wiring, MAP sensor, intake system

129

Exhaust gas recirculation (EGR) valve position sensor
- voltage low

Wiring open circuit/short to earth, EGR valve position sensor

131

Exhaust gas recirculation (EGR) valve position sensor
- voltage high

Wiring short to positive, EGR valve position sensor

132

Exhaust gas recirculation (EGR) valve position sensor
- incorrect signal

Wiring, EGR valve position sensor

135

Engine control module (ECM) - MIL control

Wiring open circuit/short to earth, ECM

136

Engine control module (ECM) - unknown output error

ECM internal short to positive

137

Engine control module (ECM) - temperature high

-

138

Manifold absolute pressure (MAP) sensor - voltage low Wiring short to earth, MAP sensor

139

Manifold absolute pressure (MAP) sensor - voltage
high

Wiring short to positive, MAP sensor

143

Immobilizer control module - programming

Immobilizer control module incorrectly/not programmed

144

Immobilizer control module - no signal

Immobilizer control module

145

Immobilizer control module - incorrect signal

Immobilizer control module

Manufacturer: Opel/Vauxhall

Model: Omega-B 2,5

Engine code: X25XE

Output: 125 (170) 6000

Tuned for: R-Cat

Year: 1994-00

© Autodata Limited 2007

2008-07-12

V6.410-