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BOSCH Motronic ECU Fault Codes (c20xe/c20let)


This fault code chart shows the Bosch Motronic fault codes for the following systsms:- 1.5, 1.7, 1.8, 2.5, 2.7, 2.8, 2.8.1, 2.8.3, 3.1, MP3.1, 3.2, 4.1, 5.1, 5.1.1, First Generation and MPi.



Bosch Motronic Code Chart:




Code: Item: Fault:
12 Initiation of diagnosis. n/a
13 Oxygen sensor No change in voltage/open circuit.
14 Coolant Temperature Sensor (CTS) Low voltage
15 Coolant Temperature Sensor (CTS) High voltage
16 Knock sensor 1 No change in voltage
17 Knock sensor 2 No change in voltage
18 Knock control unit No signal, Engine Control Unit (ECU) fault
19 RPM signal (crankshaft sensor) Incorrect signal
21 Throttle position sensor High voltage
22 Throttle position sensor Low voltage
23 Knock sensor module n/a
24 Vehicle speed sensor (VSS) No signal
25 Injector valve 1 High voltage
26 Injector valve 2 High voltage
27 Injector valve 3 High voltage
28 Injector valve 4 High voltage
28 Fuel pump relay Low voltage
29 Injector valve 5 High voltage
31 Engine RPM signal (crankshaft sensor) No signal
32 Injector valve 6 High voltage
32 Fuel pump relay High voltage
33 Inlet manifold pressure sensor Voltage too high
34 Exhaust Gas Re-circulation (EGR) valve Voltage too high
34 Manifold Absolute Pressure (MAP) sensor Low voltage
35 Idle Speed Control Valve (ISCV) Poor or no idle speed control
36 Incorrect RON/Octane setting Damaged RON plug or bad connection.
37 Engine self-diagnosis (fault code light) Low voltage
38 Oxygen sensor Voltage low (1990 model year on)
39 Oxygen sensor Voltage high (1990 model year on)
41 Vehicle speed sensor (VSS) Low voltage
41 1 gear ident switch (C20LET systems) Low voltage
41 EST Line coil cylinder 2&3 (M2.8/XEV systems) High voltage
42 Vehicle speed sensor (VSS) High voltage
42 1 gear ident switch (C20LET systems) High voltage
42 EST Line coil cylinder 2&3 (M2.8 / XEV systems) High voltage
43 Linear EGR system (XEV systems) Faulty
44 Oxygen sensor Air/fuel mixture too lean (weak)
45 Oxygen sensor Air/fuel mixture too rich
46 Air pump relay High voltage
47 Air pump relay Low voltage
47 Linear EGR Position (XEV systems) Faulty
48 Battery voltage Low voltage
49 Battery voltage High voltage
51 ECU Programmable memory PROM error, hardware failure
52 Engine check light; final stage (fault code light) High voltage
53 Fuel pump relay Low voltage
54 Fuel pump relay High voltage
55 Engine Control Unit (ECU) fault Renew Engine Control Unit (ECU)
56 Idle Speed Control Valve (ISCV) Short to earth
57 Idle Speed Control Valve (ISCV) Interruption
59 Inlet manifold valve 1 Low voltage
61 Fuel Tank Vent Valve (FTVV) Low voltage
62 Fuel Tank Vent Valve (FTVV) High voltage
63 Inlet manifold valve 1 High voltage
63 EST Line coil cylinder 2&3 (M2.8 / XEV systems) Low voltage
64 EST Line coil cylinder 1&4 (M2.8 / XEV systems) Low voltage
65 Carbon Monoxide (CO) potentiometer Low voltage
66 Carbon Monoxide (CO) potentiometer High voltage
67 Throttle valve switch - idle position switch Low voltage - switch not opening
68 Throttle Switch (TS) - idle contact Idle switch not opening
69 Air Temperature Sensor (ATS) Low voltage
71 Air Temperature Sensor (ATS) High voltage
72 Throttle Switch (TS) - full load contact High voltage - Full load switch not running
73 Air Flow Sensor (AFS) Low voltage
74 Air Flow Sensor (AFS) High voltage
75 Transmission switch - torque control Low voltage
76 Automatic Transmission (AT) torque control Engaged long, ignition retard long
79 Traction control unit Incorrect ignition/injector cut-off
81 Injector valve 1 Low voltage
82 Injector valve 2 Low voltage
83 Injector valve 3 Low voltage
84 Injector valve 4 Low voltage
85 Injector valve 5 Low voltage
86 Injector valve 6 Low voltage
87 Air Conditioning (AC) cut off relay Low voltage
88 Air Conditioning (AC) cut off relay High voltage
89 Oxygen sensor heater Low voltage
91 Oxygen sensor heater High voltage
92 Camshaft sensor failure (XEV systems) Faulty
93 Hall Effect Switch (HES) Low voltage
94 Hall Effect Switch (HES) High voltage
95 Hot start valve Low voltage
96 Hot start valve High voltage
97 Traction control unit - ignition/injection cut off Incorrect signal - high voltage
98 Oxygen sensor Open circuit, wiring break
99 Code unknown n/a
113 Turbo boost control Boost presure high, out of range
114 Idle boost valve Above upper limit
115 Full boost pressure Below lower limit
116 Boost pressure Above upper limit
117 Wastegate valve Low voltage
118 Wastegate valve High voltage
121 Oxygen sensor 2 Lean exhaust, weak mixture
122 Oxygen sensor 2 Rich mixture/exhaust
123 Inlet manifold valve 1 Blocked
124 Inlet manifold valve 2 Blocked
132 Exhaust Gas Re-circulation (EGR) valve Incorrect signal
133 Exhaust Gas Re-circulation (EGR) valve 2 High voltage
134 Exhaust Gas Re-circulation (EGR) valve 2 Low voltage
135 'Check engine' lamp (fault code lamp) Low voltage
136 Engine Control Unit (ECU) n/a
137 Engine Control Unit (ECU) box High temperature
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 recived Faulty unit or break in wiring
145 Incorrect immobiliser signal received Faulty unit or break in wiring



GM-Multec ECU Fault Codes


This fault code chart shows the GM-Multec fault codes for the following systems:- SPi, MPi, CFi, M and S.



GM-Multec Code Chart:




Code: Item: Fault:
12 Initiation of diagnosis. n/a
13 Oxygen sensor No change in voltage/open circuit.
14 Coolant Temperature Sensor (CTS) Low voltage
15 Coolant Temperature Sensor (CTS) High voltage
16 Knock signal circuit n/a
18 Knock control processor n/a
19 Crank Angle Sensor (CAS) Incorrect RPM signal
21 Throttle Potentiometer Sensor (TPS) High voltage
22 Throttle Potentiometer Sensor (TPS) Low voltage
24 Vehicle Speed Sensor (VSS) No speed signal or low voltage
25 Injector valve Low voltage
28 Fuel pump relay contacts Contact problem
29 Fuel pump relay Low voltage
32 Fuel pump relay High voltage
33 Manifold Absolute Pressure (MAP) sensor High voltage
34 Manifold Absolute Pressure (MAP) sensor Low voltage
35 Idle stepper motor Poor or no idle speed control
41 Amplifier control signal, cylinders 2 and 3 (Direct Ignition System (DIS)) High voltage
42 Amplifier control signal, cylinders 1 and 4 (Direct Ignition System (DIS)) High voltage
43 Primary ignition (distributor systems) High voltage
44 Oxygen sensor Air/Fuel mixture too lean (weak)
45 Oxygen sensor Air/Fuel mixture too rich
46 Amplifier (Direct Ignition System (DIS)) control signal (A+B) High voltage
47 Linear exhaust gas re-circulation (EGR) position n/a
49 Battery supply to Engine Control Unit (ECU) High voltage (greater than 17 volts)
51 Engine Control Unit (ECU) Defective ECU (disconnect and reconnect (ECU), then recheck for fault codes). Memory failure
52 Secondary air pump relay Low voltage
53 Secondary air pump relay High voltage
54 Idle Carbon Monoxide (CO) potentiometer n/a
55 Engine Control Unit (ECU) fault Renew Engine Control Unit (ECU)
56 Air control soleniod Low voltage
57 Air control soleniod High voltage
61 Fuel tank vent valve (FTVV) Low voltage
62 Fuel tank vent valve (FTVV) High voltage
63 Amplifier control signal, cylinders 2 and 3 (Direct Ignition System (DIS)) Low voltage
64 Amplifier control signal, cylinders 1 and 4 (Direct Ignition System (DIS)) Low voltage
65 Primary ignition (distributor systems) Low voltage
66 Throttle position sensor (TPS) Hose broken
67 Air Flow Sensor (AFS), hot wire meter (air mass meter) Signal is outside normal operation parameters (out of range)
68 Air Flow Sensor (AFS), hot wire meter (air mass meter) Faulty air mass meter signal, incorrect frequency
69 Air Temperature Sensor (ATS) (MPi only) Low voltage
71 Air Temperature Sensor (ATS) (MPi only) High voltage
72 Amplifier (Direct Ignition System (DIS)) control signal (A+B) Lead interruption, open circuit
75 Torque control (Automatic Transmission (AT) only) Low voltage
76 Torque control (Automatic Transmission (AT) only) Continuous
81 Injector valve High voltage
83 Immobiliser No or wrong code
84 Immobiliser No signal
85 Immobiliser Wrong signal
87 Air conditioning cut-off relay Low voltage
88 Air conditioning cut-off relay High voltage
92 Camshaft sensor Faulty hall effect sensor or circuit
93 Quad drive module (in ECU) n/a

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Siemens Simtec 56.0/56.1 ECU Fault Codes



Siemens Simtec 56.0/56.1 Code Chart:




Code: Item: Fault:
12 Initiation of diagnosis. n/a
13 Oxygen sensor Open circuit
14 Coolant temperature sensor Voltage low
15 Coolant temperature sensor Voltage high
16 Knock sensor signal circuit No change in voltage
19 Incorrect Revs per Minute (RPM) signal (crankshaft sensor) Incorrect signal, check sensor
21 Throttle position sensor (TPS) Voltage high
22 Throttle position sensor (TPS) Voltage low
23 Knock control module signal Out of range
24 Vehicle speed signal (VSS) 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
37 Check light (fault code lamp) Voltage low
38 Oxygen sensor circuit Voltage high
39 Oxygen sensor circuit Voltage low
44 Oxygen sensor Lean exhaust (weak mixture)
45 Oxygen sensor Rich exhaust (rich mixture)
48 Battery Voltage low
49 Battery Voltage high
52 Check light (fault code lamp) Voltage high
53 Fuel pump relay Voltage low
54 Fuel pump relay Voltage high
55 Engine Control Unit (ECU) faulty Check chassis earth and ECU connector.
56 Idle air control Voltage high
57 Idle air control Voltage low
61 Fuel tank vent valve Voltage low
62 Fuel tank vent valve Voltage high
69 Intake air temperature sensor Voltage low
71 Intake air temperature sensor Voltage high
73 Mass air flow temperature Voltage low
74 Mass air flow temperature Voltage high
75 Torque control (automatic) Voltage low
76 Torque control (automatic) Continuous signal, ignition retard long
81 Injector valve 1 Voltage low. Injector short circuit to ground.
82 Injector valve 2 Voltage low. Injector short circuit to ground.
83 Injector valve 3 Voltage low. Injector short circuit to ground.
84 Injector valve 4 Voltage low. Injector short circuit to ground.
87 Air Conditioning (A/C) cut-off relay Voltage low
88 Air Conditioning (A/C) cut-off relay Voltage high
91 Oxygen sensor heater Voltage high
92 Camshaft sensor Incorrect signal
98 Oxygen sensor heater Voltage low, open circuit



Siemens Simtec 56.5 ECU Fault Codes



Siemens Simtec 56.5 Code Chart (P Codes):




Code: Item: Fault:
0100 Mass Air Flow (MAF) sensor n/a
0105 Intake manifold pressure sensor n/a
0110 Intake Air Temperature Sesnor (ATS) n/a
0115 Intake Coolant Temperature Sesnor (CTS) n/a
0120 Throttle Potentiometer Sensor (TPS) n/a
0130 Heated Exhaust Gas Oxygen (HEGO) sensor n/a
0135 Heated Exhaust Gas Oxygen (HEGO) sensor heater n/a
0150 Heated Exhaust Gas Oxygen (HEGO) sensor n/a
0173 Heated Exhaust Gas Oxygen (HEGO) sensor n/a
0201 Injector valve 1 n/a
0202 Injector valve 2 n/a
0203 Injector valve 3 n/a
0204 Injector valve 4 n/a
0205 Injector valve 5 n/a
0206 Injector valve 6 n/a
0230 Fuel pump n/a
0325 Knock sensor n/a
0330 Knock sensor 2 n/a
0335 Crank sensor n/a
0340 Camshaft sensor n/a
0351 Ignition coil 1 and 4 n/a
0352 Ignition coil 2 and 3 n/a
0400 Exhaust gas circulation valve n/a
0403 Exhaust Gas Re-circulation (EGR) valve n/a
0410 Secondary air pump relay n/a
0412 Secondary solenoid valve n/a
0433 Tank vent valve n/a
0500 Idle speed stepper motor/idle air regulator n/a
0560 Battery n/a
1110 Switch over valve solenoid n/a
1112 Switch over valve 1 n/a
1113 Switch over valve 2 n/a
1120 Throttle body malfunction n/a
1229 Power supply relay n/a
1231 Fuel pump relay n/a
1320 Knock control cylinder 1 n/a
1327 Knock control cylinder 2 n/a
1328 Knock control cylinder 3 n/a
1329 Knock control cylinder 4 n/a
1405 Exhaust Gas Re-circulation (EGR) valve n/a
1410 Secondary air pump relay n/a
1411 Secondary air pump n/a
1501 Immobiliser control unit n/a
1502 Immobiliser control unit n/a
1503 Immobiliser control unit n/a
1530 Air flow relay n/a
1600 Internal control module n/a
1601 Engine Control Unit (ECU) too hot n/a
1602 Knock control module n/a
1604 Knock control unit n/a
1605 Knock control unit n/a
1606 Knock control unit n/a
1640 Knock control unit or quad drive module n/a
1690 MIL/Engine fail (malfunction indicator lamp) n/a
1740 Torque control unit n/a