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.
1999 Isuzu Trooper Part TimeFACTORY OEM SERVICE PROCEDURE
Engine Controls - Self-Diagnostics
- Diagnostic Tests
- Diagnostic Trouble Code Identification
- Notes
- DTC P0101: Mass Airflow (MAF) Sensor Circuit Performance
- DTC P0102: Mass Airflow (MAF) Sensor Circuit/Low Frequency
- DTC P0103: Mass Airflow (MAF) Sensor Circuit/High Frequency
- DTC P0106: Manifold Absolute Pressure (Map) Sensor Circuit Performance
- DTC P0107: Manifold Absolute Pressure (Map) Sensor Circuit/Low Voltage
- DTC P0108: Manifold Absolute Pressure (Map) Sensor Circuit/High Voltage
- DTC P0112: Intake Air Temperature (IAT) Circuit/Low Voltage
- DTC P0113: Intake Air Temperature (IAT) Circuit/High Voltage
- DTC P0117: Engine Coolant Temperature (ECT) Circuit/Low Voltage
- DTC P0118: Engine Coolant Temperature (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: Heated Oxygen Sensor (Ho2S) No. 1 Bank 1/Low Voltage
- DTC P0132: Heated Oxygen Sensor (Ho2S) No. 1 Bank 1/High Voltage
- DTC P0133: Heated Oxygen Sensor (Ho2S) No. 1 Bank 1/Slow Response
- DTC P0134: Heated Oxygen Sensor (Ho2S) No. 1 Bank 1/Insufficient Activity
- DTC P0135: Heated Oxygen Sensor (Ho2S) No. 1 Bank 1/Heater Circuit
- DTC P0137: Heated Oxygen Sensor (Ho2S) No. 2 Bank 1/Low Voltage
- DTC P0138: Heated Oxygen Sensor (Ho2S) No. 2 Bank 1/High Voltage
- DTC P0140: Heated Oxygen Sensor (Ho2S) No. 2 Bank 1/Insufficient Activity
- DTC P0141: Heated Oxygen Sensor (Ho2S) No. 2 Bank 1/Heater Circuit
- DTC P0143: Heated Oxygen Sensor (Ho2S) No. 3 Bank 1/Low Voltage (3.5L)
- DTC P0144: Heated Oxygen Sensor (Ho2S) No. 3 Bank 1/High Voltage (3.5L)
- DTC P0146: Heated Oxygen Sensor (Ho2S) No. 3 Bank 1/Insufficient Activity (3.5L)
- DTC P0147: Heated Oxygen Sensor (Ho2S) No. 3 Bank 1/Heater Circuit (3.5L)
- DTC P0151: Heated Oxygen Sensor (Ho2S) No. 1 Bank 2/Low Voltage
- DTC P0152: Heated Oxygen Sensor (Ho2S) No. 1 Bank 2/High Voltage
- DTC P0153: Heated Oxygen Sensor (Ho2S) No. 1 Bank 2/Slow Response
- DTC P0154: Heated Oxygen Sensor (Ho2S) No. 1 Bank 2/Insufficient Activity
- DTC P0155: Heated Oxygen Sensor (Ho2S) No. 1 Bank 2/Heater Circuit
- DTC P0157: Heated Oxygen Sensor (Ho2S) No. 2 Bank 2/Low Voltage
- DTC P0158: Heated Oxygen Sensor (Ho2S) No. 2 Bank 2/High Voltage
- DTC P0160: Heated Oxygen Sensor (Ho2S) No. 2 Bank 2/Insufficient Activity
- DTC P0161: Heated Oxygen Sensor (Ho2S) No. 2 Bank 2/Heater Circuit
- 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
- DTC P0300: Random Misfire Detected
- DTC P0301-P0306: Misfire
- DTC P0325: Knock Filter Module
- DTC P0327: Knock Sensor (KS) Circuit
- DTC P0336: Crankshaft Position (CKP) Sensor 58X Reference Signal Circuit
- DTC P0337: Crankshaft Position (CKP) Sensor Circuit/Low Frequency
- DTC P0341: Camshaft Position (CMP) Sensor Circuit Performance
- DTC P0342: Camshaft Position (CMP) Sensor Circuit Low
- DTC P0351-P0356: Ignition Circuit
- DTC P0401: EGR Flow Insufficient
- DTC P0402: EGR Pintle Crank Error
- DTC P0404: EGR Stuck Open
- DTC P0405: EGR Low Voltage
- DTC P0406: EGR High Voltage
- DTC P0420: Low Catalyst Efficiency Bank 1, Or DTC P0430: Low Catalyst Efficiency Bank 2
- DTC P0440: EVAP System
- DTC P0442: EVAP System Small Leak Detected
- DTC P0446: EVAP Canister Vent Blocked
- DTC P0452: Fuel Tank Pressure Sensor Low Voltage
- DTC P0453: Fuel Tank Pressure Sensor High Voltage
- DTC P0461: Fuel Level Sensor Circuit Performance (3.2L)
- DTC P0462: Fuel Level Sensor Circuit Low Voltage (VEHICROSS & 3.2L)
- DTC P0463: Fuel Level Sensor Circuit High Voltage (VEHICROSS & 3.2L)
- 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: Heated Oxygen Sensor (Ho2S) No. 1 Bank 1 Circuit/Insufficient Switching
- DTC P1134: Heated Oxygen Sensor (Ho2S) No. 1 Bank 1 Circuit Transition Time Ratio
- DTC P1153: Heated Oxygen Sensor (Ho2S) No. 1 Bank 2 Circuit/Insufficient Switching
- DTC P1154: Heated Oxygen Sensor (Ho2S) No. 1 Bank 2 Circuit Transition Time Ratio
- DTC P1171: Fuel System Lean During Acceleration
- DTC P1380: Abs Rough Road Abs System Fault
- DTC P1381: Abs Rough Road Class 2 Serial Link Error
- DTC P1404: EGR Stuck Closed
- DTC P1441: EVAP System Flow During Non-Purge (3.2L)
- DTC P1441: EVAP System Flow During Non-Purge (3.5L)
- DTC P1442: EVAP Vacuum Switch High Voltage During Ignition On (3.5L)
- DTC P1508: Idle Air Control (IAC) System Low Rpm
- DTC P1509: Idle Control System High Rpm
- DTC P1618: Serial Peripheral Interface (SPI) Pcm INTERPROCESSOR Communication Error
- DTC P1625: Pcm Unexpected Reset
- DTC P1640: Output Driver Module (ODM) "A" Fault
- DTC P1650: Quad Driver Module "A" Fault
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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