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Isuzu Diagnostic Codes, Trouble Codes and Descriptions

WesTech Auto

Diagnostic Codes

Isuzu

12 No Distributor Reference Pulses
13 Oxygen Sensor Circuit
14 Coolant Temperature Sensor Circuit
15 Coolant Temperature Sensor Circuit
21 Throttle Position Sensor and/or Idle Switch
21 MAP Sensor (1989 I-Mark)
22 Throttle Position Sensor Circuit
22 No Starter Signal (I-Mark, MPFI)
22 Fuel Cut Off Relay (Carbureted)
23 M/C Solenoid Circuit (Carbureted)
23 Manifold Absolute Temperature Sensor Circuit
24 Vehicle Speed Sensor
25 Manifold Absolute Temperature Sensor or Vacuum Switching Valve
26 Vacuum Switching Valve System
27 Vacuum Switching Valve System
31 No Ignition Reference Pulses to ECM (Carbureted)
31 Wastegate Control
32 EGR System
33 MAP Sensor Circuit
33 Fuel Injector (1988-1991 Impulse, others with 2.6L Engine)
34 MAP Sensor Circuit
34 EGR Gas Sensor Circuit (Carbureted, Stylus & 1990-1992 Turbocharged Impulse)
34 Fuel Injector (Impulse)
35 Power Transistor System
36 MAP Sensor Circuit
41 Crank Angle Sensor
41 Cam Signal (Stylus & 1990-1992 Turbocharged Impulse)
42 Fuel Cut Off Relay (Carbureted)
42 Electronic Spark Timing (Throttle Body Injection)
42 Ignition Control Circuit
43 Electronic Spark Control
43 Knock Sensor (I-Mark, MPFI)
43 Throttle Valve Switch (1988-1991 Impulse, others with 2.6L Engine)
44 Oxygen Sensor Lean
44 Fuel Metering (1988-1991 Impulse, others with 2.6L Engine)
45 Oxygen Sensor Rich
45 Fuel Metering (1988-1991 Impulse, others with 2.6L Engine)
51 Fuel Cutoff Solenoid Circuit (Pickup, Carbureted) or ECM (all models)
52 ECM (PROM, EEPROM, ROM, RAM, or ECM itself)
53 Vacuum Switching Valve and/or ECM
54 M/C Solenoid Circuit and/or ECM (I-Mark, Carbureted)
54 Vacuum Control Solenoid and/or ECM (Pickup, Carbureted)
54 Power Transistor System
54 Fuel Pump, Voltage Low (TBI and I-Mark, MPFI)
55 ECM
61 Air Flow Sensor
62 Air Flow Sensor
63 Vehicle Speed Sensor
64 Fuel Injector
66 Knock Sensor
71 Throttle Position Sensor
72 Vacuum Switching Valve Faulty EGR
73 Vacuum Switching Valve Faulty EGR
The Diagnostic Codes and Explanations are derived from Manufacturer supplied Technical Data. WesTech does not guarantee the accuracy of this Information nor can it be held liable for providing it.
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