Diagnostic Aids

Engine Runs Okay  - Check for a faulty light bulb, circuit No. A5 open or defective gauge fuse. This will result in no oil or alternator lights, seat belt reminder, etc.

Engine Cranks, But Will Not Run  - Check for continuous battery drain, fuse or fusible link open, ECM ignition fuse open, battery circuits No. B1 and C16 to ECM open, ignition circuit No. A6 to ECM open or poor connection to ECM.

Fig 1: Chart A-1 Schematic - No Check Engine Light

Courtesy of ISUZU MOTOR CO.

Fig 2: Chart A-1 Flow Chart - No Check Engine Light

Courtesy of ISUZU MOTOR CO.