Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1996 Isuzu Trooper LS, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Circuit Tests
- Notes
- DTC P0101 - Mass Airflow (MAF) Sensor Circuit Performance
- DTC P0102 - MAF Sensor Circuit/Low Frequency
- DTC P0103 - Mass Airflow (MAF) Sensor Circuit/High Frequency
- DTC P0106 - Map Sensor Circuit Performance
- DTC P0107 - Map Sensor Circuit/Low Voltage
- DTC P0108 - Map Sensor Circuit/High Voltage
- DTC P0112 - IAT Circuit/Low Voltage
- DTC P0113 - Intake Air Temperature (IAT) Circuit/High Voltage
- DTC P0117 - ECT Circuit/Low Voltage
- DTC P0118 - ECT Circuit/High Voltage
- DTC P0121 - Throttle Position (TP) Sensor Circuit Performance
- DTC P0122 - Throttle Position (TP) Sensor Circuit/Low Voltage
- DTC P0123 - Throttle Position (TP) Sensor Circuit/Low Voltage
- DTC P0125 - Insufficient Coolant Temperature For Closed Loop
- DTC P0131 - Ho2S No. 1 Bank 1/Low Voltage
- DTC P0132 - Ho2S No. 1 Bank 1/High Voltage
- DTC P0133 - Ho2S No. 1 Bank 1/Slow Response
- DTC P0134 - Ho2S No. 1 Bank 1/Insufficient Activity
- DTC P0135 - Ho2S No. 1 Bank 1/Heater Circuit
- DTC P0137 - Ho2S No. 2 Bank 1/Low Voltage
- DTC P0138 - Ho2S No. 2 Bank 1/High Voltage
- DTC P0140 - Ho2S No. 2 Bank 1/Insufficient Activity
- DTC P0141 - Ho2S No. 2 Bank 1/Heater Circuit
- DTC P0143 - Ho2S No. 3 Bank 1/Low Voltage
- DTC P0144 - Ho2S No. 3 Bank 1/High Voltage
- DTC P0146 - Ho2S No. 3 Bank 1/Insufficient Activity
- DTC P0147 - Ho2S No. 3 Bank 1/Heater Circuit
- DTC P0151 - Ho2S No. 1 Bank 2/Low Voltage
- DTC P0152 - Ho2S No. 1 Bank 2/High Voltage
- DTC P0153 - Ho2S No. 1 Bank 2/Slow Response
- DTC P0154 - Ho2S No. 1 Bank 2/Insufficient Activity
- DTC P0155 - Ho2S No. 1 Bank 2/Heater Circuit
- DTC P0157 - Ho2S No. 2 Bank 2/Low Voltage (A/T Only)
- DTC P0158 - Ho2S No. 2 Bank 2/High Voltage (A/T Only)
- DTC P0160 - Ho2S No. 2 Bank 2/Insufficient Activity (A/T Only)
- DTC P0161 - Ho2S No. 2 Bank 2/Heater Circuit (A/T Only)
- DTC P0171 - Bank 1 System Too Lean
- DTC P0172 - Bank 1 System Too Rich
- DTC P0174 - Bank 2 System Too Lean
- DTC P0175 - Bank 2 System Too Rich
- DTC P0201-P0206 Injector Circuit Nos. 1-6
- DTC P0300 - Random Misfire Detected
- DTC P0301-P0306 Cylinder Nos. 1-6 Misfire
- DTC P0325 - Knock Filter Module
- DTC P0327 - Knock Sensor (KS) Circuit
- DTC P0336 - CKP Sensor 58X Reference Signal Circuit
- DTC P0337 - CKP Sensor Circuit/Low Frequency
- DTC P0341 - CMP Sensor Circuit Performance
- DTC P0342 - Camshaft Position (CMP) Sensor/No Signal
- DTC P0351-P0356 - Ignition Circuit Nos. 1-6
- DTC P0401 - EGR Flow Insufficient
- DTC P0420 - Low Catalyst Efficiency Bank 1
- DTC P0440 - EVAP System
- DTC P0442 - EVAP System Small Leak Detected
- DTC P0446 - EVAP Canister Vent Blocked
- DTC P0461 - Fuel Level Sensor Circuit Performance
- DTC P0462 - Fuel Level Sensor Circuit Low Voltage
- DTC P0463 - Fuel Level Sensor Circuit High Voltage
- DTC P0502 - Vehicle Speed Sensor (VSS) Circuit/Low Input
- DTC P0506 - Idle Control System Low Rpm
- DTC P0507 - Idle Control System High Rpm
- DTC P0562 - System Low Voltage
- DTC P0563 - System High Voltage
- DTC P0601 - Pcm Memory Error
- DTC P1106 - Map Sensor Circuit Intermittent High Voltage
- DTC P1107 - Map Sensor Circuit Intermittent Low Voltage
- DTC P1111 - IAT Sensor Circuit Intermittent High Voltage
- DTC P1112 - IAT Sensor Circuit Intermittent Low Voltage
- DTC P1114 - ECT Sensor Circuit Intermittent Low Voltage
- DTC P1115 - ECT Sensor Circuit Intermittent High Voltage
- DTC P1121 - TP Sensor Circuit Intermittent High Voltage
- DTC P1122 - TP Sensor Circuit Intermittent Low Voltage
- DTC P1133 - Ho2S No. 1 Bank 1 Circuit/Insufficient Switching
- DTC P1134 - Ho2S No. 1 Bank 1 Circuit Transition Time Ratio
- DTC P01153 - Ho2S No. 1 Bank 2 Circuit/Insufficient Switching
- DTC P1154 - Ho2S No. 1 Bank 2 Circuit Transition Time Ratio
- DTC P1171 - Fuel System Lean During Acceleration
- DTC P1390 - "G" Sensor Circuit Intermittent Low Voltage
- DTC P1391 - "G" Sensor Circuit Performance
- DTC P1392 - "G" Sensor Circuit Low Voltage
- DTC P1393 - "G" Sensor Circuit High Voltage
- DTC P1394 - "G" Sensor Circuit Intermittent High Voltage
- DTC P1406 - EGR Valve Pintle Position Circuit
- DTC P1441 - EVAP System Flow During Non-Purge
- DTC P1442 - EVAP System Vacuum Switch Circuit
- DTC P1508 - Idle Control System Low Rpm
- DTC P1509 - Idle Control System High Rpm
- DTC P1618 - SPI Pcm INTERPROCESSOR Communication Error
- DTC P1640 - Output Driver Module (ODM) "A" Fault
- Summary
- Wiring Diagrams
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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