Test Description

The number(s) below refer to step(s) on diagnostic table.

1. 2. It is important to check for presence of spark to all of cylinders to isolate problem to either EI system ignition coil inputs or outputs.
2. 5. In checking PCM/ECM outputs for electronic spark timing signal, it recommended to use an oscilloscope to view varying voltage signals. In measuring these outputs with a voltmeter, intermittent errors may occur that cannot be seen by a voltmeter.
3. 6. After confirming PCM/ECM inputs for electronic spark timing to EI system ignition coil are okay it can be determined that a faulty EI system ignition coil is at fault.
4. 11. After confirming proper CKP sensor inputs to PCM/ECM and no wiring problems present, it can be determined that PCM/ECM is at fault.
5. 24. This step, along with step 25, checks for battery voltage and a ground to EI system ignition coil.

Fig 1: Ignition System Check (1 Of 3)

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Fig 2: Ignition System Check (2 of 3)

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Fig 3: Ignition System Check (3 Of 3)

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