LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Isuzu >> 1998 >> Trooper S, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.2L & 3.5L >> Diagnostic Trouble Code Identification
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Trouble Code Identification

DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC/Type (1) Component/System Most Likely Cause
P0101  /B MAF Sensor Circuit Range/ Performance Problem MAF Sensor
P0102  /A MAF Sensor Circuit Low Frequency Open/Short, MAF Sensor Or PCM
P0103  /A MAF Sensor Circuit High Frequency Open/Short, MAF Sensor Or PCM
P0106  /B MAP Sensor Circuit Range/ Performance Problem MAP Sensor
P0107  /A MAP Sensor Circuit Low Frequency Open/Short, MAP Sensor Or PCM
P0108  /A MAP Sensor Circuit High Frequency Open, MAP Sensor Or PCM
P0112  /A IAT Sensor Circuit Low Frequency Short, IAT Sensor Or PCM
P0113  /A IAT Sensor Circuit High Frequency Open, IAT Sensor Or PCM
P0117  /A ECT Sensor Circuit Low Frequency Short, ECT Sensor Or PCM
P0118  /A ECT Sensor Circuit High Frequency Open, ECT Sensor Or PCM
P0121  /A TP Sensor Circuit Range/ Performance Problem TP Sensor Or PCM
P0122  /A TP Sensor Circuit Low Frequency Open/Short, TP Sensor Or PCM
P0123  /A TP Sensor Circuit High Frequency Open Circuit, TP Sensor Or PCM
P0125  /B ECT Sensor Circuit Excessive Warm-Up Time To Closed Loop Cooling System, ECT Or PCM
P0131  /A Bank 1 Primary HO2S Circuit Low Voltage Short, HO2S Sensor, Fuel Supply Or PCM
P0132  /A Bank 1 Primary HO2S Circuit High Voltage Open, HO2S Sensor Or PCM
P0133  /B Bank 1 Primary HO2S Slow Response Open/Short, HO2S Sensor Or PCM
P0134  /A Bank 1 Primary HO2S Insufficient Activity Poor Connections, HO2S Sensor Or PCM
P0135  /B Bank 1 Primary HO2S Heater Circuit Malfunction Open/Short Or HO2S
P0137  /A Bank 1 Secondary HO2S Circuit Low Voltage Short, HO2S Or PCM
P0138  /A Bank 1 Secondary HO2S Circuit High Voltage Open/Short, HO2S Or PCM
P0140  /A Bank 1 Secondary HO2S Circuit Insufficient Activity Open, HO2S Or PCM
P0141  /B Bank 1 Secondary HO2S Circuit Malfunction Open Or HO2S
P0143  /A (3) Bank 1 Tertiary HO2S Low Voltage (M/T Only) Short Or PCM
P0144  /A (3) Bank 1 Tertiary HO2S High Voltage (M/T Only) Open/Short, HO2S Or PCM
P0146  /A (3) Bank 1 Tertiary HO2S Insufficient Activity (M/T Only) Short, HO2S Or PCM
P0147  /B (3) Bank 1 Tertiary HO2S Heater Circuit (M/T Only) Open/Short Or HO2S
P0151  /A (3) Bank 2 Secondary HO2S Circuit Low Voltage Short Or PCM
P0152  /A Bank 2 Secondary HO2S Circuit High Voltage Short, HO2S Or PCM
P0153  /B Bank 2 Secondary HO2S Circuit Slow Response Open/Short, HO2S Contamination Or PCM
P0154  /A Bank 2 Secondary HO2S Insufficient Activity HO2S Or PCM
P0155  /B Bank 2 Secondary HO2S Heater Circuit Short Or HO2S
P0157  /A Bank 2 Secondary HO2S Circuit Low Voltage (A/T Only) Short Or PCM
P0158  /A Bank 2 Secondary HO2S Circuit High Voltage (A/T Only) Short, HO2S Or PCM
P0160  /A Bank 2 Secondary HO2S Circuit Insufficient Activity (A/T Only) Open, HO2S Or PCM
P0161  /B Bank 2 Secondary HO2S Heater Circuit Malfunction (A/T Only) Open Or HO2S
P0171  /B Bank 1 System Too Lean Fuel Supply/Contam- ination, Primary HO2S, MAF, Leaking Exhaust Or Valve Clearance
P0172  /B Bank 1 System Too Rich Fuel Supply, Primary HO2S, MAF Sensor, Fuel, Contamination Or Valve Clearance
P0174  /B Bank 2 System Too Lean Air Intake System, MAF Sensor, Fuel Supply Or Exhaust System
P0175  /B Bank 2 System Too Rich Air Intake System, MAF Sensor, Fuel Supply Or TP Sensor
P0201  /A Injector No. 1 Circuit Malfunction Open/Short Or PCM
P0202  /A Injector No. 2 Circuit Malfunction Open/Short Or PCM
P0203  /A Injector No. 3 Circuit Malfunction Open/Short Or PCM
P0204  /A Injector No. 4 Circuit Malfunction Open/Short Or PCM
P0205  /A Injector No. 5 Circuit Malfunction Open/Short Or PCM
P0206  /A Injector No. 6 Circuit Malfunction Open/Short Or PCM
P0218/D (4) Transmission High Temp. Condition (A/T Only) Miscellaneous
P0300  /B Random Misfire Detected Ignition System, Fuel Supply, MAF Sensor, EGR System, IAC Valve Or Contaminated Fuel
P0301  /B Cylinder No. 1 Misfire Detected Miscellaneous
P0302  /B Cylinder No. 2 Misfire Detected Miscellaneous
P0303  /B Cylinder No. 3 Misfire Detected Miscellaneous
P0304  /B Cylinder No. 4 Misfire Detected Miscellaneous
P0305  /B Cylinder No. 5 Misfire Detected Miscellaneous
P0306  /B Cylinder No. 6 Misfire Detected Miscellaneous
P0325  /B Knock Filter Module PCM
P0327  /B Knock Sensor (KS) Circuit Open/Short, KS Or PCM
P0336  /B CKP Sensor Range/Performance Or Reference Signal CKP Sensor, Valve Timing, Timing Belt Skipped Teeth, Or PCM
P0337  /B CKP Circuit Low Frequency Open/Short, CKP Sensor Or PCM
P0341  /A CMP Circuit Performance Open/Short, CMP Sensor, Faulty Or Missing CMP Magnet OR PCM
P0342  /A CMP Sensor Low Frequency CMP Sensor/Magnet Or PCM
P0351  /A Ignition 1 Control Circuit Ignition Control Module (ICM) Open/Short Or PCM
P0352  /A Ignition 2 Control Circuit Miscellaneous
P0353  /A Ignition 3 Control Circuit Miscellaneous
P0354  /A Ignition 4 Control Circuit Miscellaneous
P0355  /A Ignition 5 Control Circuit Miscellaneous
P0356  /A Ignition 6 Control Circuit Miscellaneous
P0401  /A Insufficient EGR Flow Detected MAP Sensor, EGR Valve Or Line
P0402  /B EGR Pintle Crank Error Open, Poor Connections, Open Or EGR Valve
P0404  /B EGR Valve Pintle Position Open EGR Valve, EGR Valve Circuit Or PCM
P0405  /A EGR Valve Sensor Signal Low Short, EGR Valve Or PCM
P0406  /A EGR Sensor Signal High Open/Short, EGR Valve Or PCM
P0420  /A Bank 1 Catalyst System Efficiency Below Threshold Catalytic Converter Or Secondary HO2S
P0430  /A Bank 2 Catalyst System Efficiency Below Threshold (A/T Only) Catalytic Converter Or Secondary HO2S
P0440  /A (2) EVAP System EVAP Canister, Canister Purge Valve, EVAP Vent Solenoid Or Hoses
P0441  /B (3) Evaporative Emission Control System, Incorrect Purge Flow EVAP Canister, Vacuum Switch, Purge Solenoid Or PCM
P0442  /A (2) EVAP Small Leak Detected Vent Solenoid, Fuel Cap Or Lines
P0446  /A (2) EVAP System Canister Vent Blocked Short, EVAP Canister Vent Solenoid Or EVAP Canister
P0452  /D Fuel Tank Pressure Sensor Signal Low Open Or PCM
P0453  /D Fuel Tank Pressure Sensor Signal High Open/Short, Pressure Sensor Or PCM
P0461  /D (2) Fuel Level Sensor Circuit Performance Fuel Level Sensor/ Circuit Or PCM/VCM
P0462  /D (2) Fuel Level Sensor Circuit Low Voltage Open/Short, Fuel Level Sensor Or PCM/VCM
P0463  /D (2) Fuel Level Sensor Circuit High Voltage Fuel Level Sensor/ Circuit Or PCM/VCM
P0502  /A VSS Circuit Low Frequency Open/Short, VSS Or PCM
P0506  /B Idle Control System Low RPM Open/Short, IAC Valve Or PCM
P0507  /B Idle Control System High RPM IAC Valve Or PCM
P0560/D (4) System Voltage Malfunction (A/T Only) Miscellaneous
P0562  /D System Voltage Low Open Or PCM
P0563  /D System Voltage High Generator Or PCM
P0601  /A Powertrain Control module (PCM) Memory Check Sum Error PCM
P0705/D (4) Transmission Range Switch Illegal Position Miscellaneous
P0706/D (4) Transmission Range Sensor Performance Miscellaneous
P0712/D (4) Transmission Fluid Temperature Low Voltage Miscellaneous
P0713/D (4) Transmission Fluid Temperature High Voltage Miscellaneous
P0719/D (4) Brake Switch Circuit Low Miscellaneous
P0722/A (4) Output Speed Sensor Circuit No Signal Miscellaneous
P0723/A (4) Output speed Sensor Circuit Intermittent Signal Miscellaneous
P0724/D (4) Brake Switch Circuit High Miscellaneous
P0730/C (4) Incorrect Gear Ratio. Stuck In 1st Or 4th Gear (A/T) Faulty Shift Control System
P0742/A (4) Torque Converter Clutch Circuit Stuck On Miscellaneous
P0748/C (4) Transmission Pressure Control Solenoid Electrical Circuit Fault Miscellaneous
P0751/B (4) Transmission Shift Solenoid "A" Performance Or Stuck Off (A/T) Miscellaneous
P0753/A (4) Transmission Shift Solenoid "A" Electrical Circuit Fault Open/Short Or Faulty Solenoid
P0756/B (4) Transmission Shift Solenoid "B" Performance Stuck Off (A/T) Miscellaneous
P0758/A (4) Transmission Shift Solenoid "B" Electrical Circuit Fault Open/Short Or Faulty Solenoid
P1106  /D Manifold Absolute Pressure (MAP) Circuit Intermittent High Voltage Open/Short In Circuit
P1107  /D MAP/Barometric Pressure Circuit Low Voltage Intermittent Open/ Short Or PCM
P1111  /D Intake Air Temperature (IAT) Circuit Intermittent High Voltage Poor Ground Or Open Circuit
P1112  /D IAT Circuit Intermittent Low Voltage Short In Circuit
P1114  /D Engine Coolant Temperature (ECT) Circuit Intermittent Low Voltage Intermittent Short
P1115  /D ECT Circuit Intermittent High Voltage Poor PCM Ground Or Open
P1121  /D Throttle Position (TP) Circuit Intermittent High Voltage Open/Short Or Poor Ground In Circuit
P1122  /D TP Circuit Intermittent Low Voltage Open/Short Or Poor Ground In Circuit
P1133  /B Bank 1 Primary HO2S Circuit Insufficient Switching Exhaust Leak, Short In Circuit, HO2S Or PCM
P1134  /B Bank 1 Primary HO2S Circuit Transition Time Ratio Exhaust Leak, Open/ Short In Circuit, HO2S Or PCM
P1153  /B Bank 2 Primary HO2S Circuit Insufficient Switching Exhaust Leak, Short In Circuit, HO2S Or PCM
P1154  /B Bank 2 Primary HO2S Circuit Transition Time Ratio Exhaust Leak, Open/ Short In Circuit, HO2S Or PCM
P1171  /A Fuel System Lean During Acceleration Faulty Or Incorrect Fuel Pump, Plugged Strainer, Incorrect Fuel Or Hot Fuel
P1380P1380  /A ABS DTC Detected Rough Road Data Unusable PCM
P1381P1381  /A ABS Rough Road Class 2 Serial Link Error Open Circuit Or PCM
P1404  /A EGR Valve Closed Pintle Position EGR Valve/Circuit Or PCM
P1441  /B (2) Evaporative Emission (EVAP) System Flow During Non-Purge Short, PCM, EVAP Purge Solenoid Or
P1441 (3) Evaporative Emission (EVAP) System Flow During Non-Purge EVAP Vacuum Switch
P1442  /B (3) EVAP System Vacuum Switch Circuit Open/Short, PCM Or EVAP Vacuum Switch
P1508  /B Idle Control System Low RPM IAC Valve Circuit Or PCM
P1509  /B Idle Control System High RPM Vacuum Leaks, IAC Circuit Or PCM
P1618  /A Serial Peripheral Interface PCM Interprocessor Communication Error PCM
P1625  /A Unexpected PCM Reset Open/Short Or PCM
P1640  /D ODM "A" Fault Open in Ignition Circuit Or PCM
P1650  /D ODM "A" Fault Open in Ignition Circuit Or PCM
P1790/A (4) TRANS ROM Checksum Error Miscellaneous
P1792/A (4) TRANS EEPROM Checksum Error Miscellaneous
P1835/D (4) TRANS Kick Down Switch Malfunction Miscellaneous
P1850/A (4) Brake Band Apply Solenoid Malfunction Miscellaneous
P1860/A (4) TCC PWM Solenoid Circuit Fault Miscellaneous
P1870/A (4) Transmission Component Slipping Miscellaneous
(1) For information on Type of DTC, see TRIP DETECTION LOGIC in TESTS W/CODES - INTRODUCTION article.
(2) Applies to 3.2L only.
(3) Applies to 3.5L only.
(4) Transmission fault. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.