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.

Fig 1: Chart A-1 - Schematic

Courtesy of ISUZU MOTOR CO.

Fig 2: Chart A-1 - Diagnostic Flowchart

Courtesy of ISUZU MOTOR CO.