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Diagnostic Trouble Codes - 1995 Isuzu

 13  Open Oxygen Sensor Circuit
 14  Coolant Temperature Sensor (High Temp Indicated)
 15  Coolant Temperature Sensor (Low Temp Indicated)
 21  Wide Open Throttle Switch Faulty
 22  Starter Signal System
 23  Power Transistor System
 25  Vacuum Switching Valve For Fuel Pressure Control
 26  Vacuum Switching Valve For EVAP Canister
 27  Vacuum Switching Valve For EVAP Canister
 32  EGR system fault
 33  Fuel Injection System
 34  EGR Temperature Sensor System
 35  Power Transistor System
 41  Crankshaft Position Sensor System
 43  Wide Open Throttle Switch Faulty
 44  Heated Oxygen Sensor (HO2S) Circuit
 45  Heated Oxygen Sensor (HO2S) Circuit
 51  Engine Control Module (ECM) RAM
 52  Engine Control Module (ECM) ROM
 53  Vacuum Switching Valve For Fuel Pressure Control
 54  Power Transistor System
 61  Mass Air Flow Sensor System
 62  Mass Air Flow Sensor System
 63  Vehicle Speed Sensor
 64  Fuel Injector System
 65  Wide Open Throttle Switch Faulty

To extract a trouble from the computer for diagnostic purposes, the Assembly Line Communication Link (ALDL) connector is used.

To activate the Diagnostic mode, a special connector located in the center console is utilized. When the ALDL (assembly line diagnostic link) connector is jumpered between terminals "A" and "C" with the ignition "ON" and the engine not running, the light will flash any stored codes.


The ALDL diagnostic connector is located in the passenger compartment.

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