Home/Isuzu/Impulse/Isuzu Impulse II (1990-1993)/Repair manual/Engine Controls - Tests W/codes - Efi/Diagnostic Aids

Contents

Section: Engine Controls - Tests W/codes - Efi

INTRODUCTION

HARD FAILURES

INTERMITTENT FAILURES

RETRIEVING CODES

CLEARING TROUBLE CODES

TROUBLE CODE CHARTS

DIAGNOSTIC CIRCUIT CHECK

ECM TERMINAL IDENTIFICATION-SOHC

CHART A-1, NO CHECK ENGINE LIGHT (NON-TURBO)

Diagnostic Aids

CHART A-1, NO CHECK ENGINE LIGHT (TURBO)

CHART A-2, NO ALDL DATA OR WON'T FLASH CODE 12 (NON-TURBO)

CHART A-2, NO ALDL DATA OR WON'T FLASH CODE 12 (TURBO) (CHECK ENGINE LIGHT ON STEADY)

CODE 13: O2 SENSOR-OPEN/SHORTED CKT (DOHC NON-TURBO)

CODE 13: O2 SENSOR-OPEN/SHORTED CKT (TURBO)

CODE 13: O2 SENSOR-OPEN/SHORTED CKT (SOHC)

CODE 14: CTS CIRCUIT-HIGH TEMP INDICATED (TURBO)

CODE 14A: CTS CKT-HIGH TEMP INDICATED (NON-TURBO)

CODE 14B: CTS CKT-LOW TEMP INDICATED (NON-TURBO)

CODE 15: CTS CKT-LOW TEMP INDICATED (TURBO)

CODE 21: TPS CKT-SIGNAL VOLTAGE HIGH (TURBO)

CODE 21A: TPS CKT-SIGNAL VOLTAGE HIGH (NON-TURBO)

CODE 21B: TPS CKT-SIGNAL VOLTAGE LOW (NON-TURBO)

CODE 22: TPS CKT-SIGNAL VOLTAGE LOW (TURBO)

CODE 23: MAT SENSOR CKT-LOW TEMP INDICATED (TURBO)

CODE 23A: MAT SENSOR CKT-LOW TEMP INDICATED (NON-TURBO)

CODE 23B: MAT SENSOR CKT-HIGH TEMP INDICATED (NON-TURBO)

CODE 24: 1.6L VSS CIRCUIT

CODE 25: MAT SENSOR CKT-HIGH TEMP INDICATED (TURBO)

CODE 31: TURBO OVERBOOST (TURBO)

CODE 32: 1.6L EXHAUST GAS RECIRCULATION (EGR) CIRCUIT

CODE 33: MAP SENSOR-SIGNAL VOLTAGE HIGH/LOW VAC (TURBO)

CODE 33A: MAP SENSOR-VOLTAGE HIGH/LOW VAC (NON-TURBO)

CODE 33B: MAP SENSOR-VOLTAGE LOW/HIGH VAC (NON-TURBO)

CODE 34: MAP SENSOR-SIGNAL VOLTAGE LOW/HIGH VAC (TURBO)

CODE 41: CAM SIGNAL CIRCUIT (TURBO)

CODE 42: EST-ELECTRONIC SPARK TIMING (NON-TURBO)

CODE 43: ESC-ELECTRONIC SPARK CONTROL (TURBO)

CODE 44: O2 SENSOR LEAN FUEL MIXTURE (DOHC NON-TURBO)

CODE 44: O2 SENSOR LEAN FUEL MIXTURE (TURBO)

CODE 44: O2 SENSOR-LEAN FUEL MIXTURE (SOHC)

CODE 45: O2 SENSOR RICH FUEL MIXTURE (DOHC NON-TURBO)

CODE 45: O2 SENSOR RICH FUEL MIXTURE (TURBO)

CODE 45: O2 SENSOR RICH FUEL MIXTURE (SOHC)

CODE 51: ECM FAILURE (MEM-CAL ERROR ON TURBO)

SUMMARY

All sections

Diagnostic Aids Isuzu Impulse II

Engine Controls - Tests W/codes - Efi 2 illustrations

Diagnostic Aids

Engine Runs Okay - Check for a faulty light bulb, open in circuit No. 419 or defective C7 (10-amp) fuse. This will result in no oil or alternator lights, seat belt reminder, etc.

Engine Cranks, But Will Not Run - Check for open in battery fuse or fusible link, ECM ignition fuse, battery circuit No. 240 to ECM, ignition circuit No. 439 to ECM, or poor connection at ECM.

Scheme 29

Scheme 29: Diagnostic Aids

Scheme 29: Diagnostic Aids

Scheme 30

Scheme 30

Scheme 30