The electronic ignition (EI) system ignition coil is supplied with battery voltage when the ignition is ON. The electronic control module (ECM) triggers the circuit for the EI system ignition coil. Voltage is then induced in the secondary portion of the EI system ignition coil. Control of the EI system ignition coil is monitored separately for the 2 electronic spark timing lines.
• | No voltage is supplied by the ECM through the electronic spark timing A line while reference pulses are received by the ECM from the crankshaft position (CKP) sensor. |
• | This error occurs over 6 times. |
• | Inspect the ECM harness connectors for backed-out terminals, improperly formed or damaged terminals, a poor terminal-to-wire connection, and a damaged wiring harness. |
• | If connections and the harness are OK, connect a digital voltmeter or an oscilloscope between the affected terminal and ground while moving the related connectors and the wiring harness. If the fault is induced, the voltage reading or the scope pattern will change. |
Step | Action | Values | Yes | No |
---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Is the problem found? | -- | Go to Step 9 | Go to Step 3 |
3 |
Does the voltage fluctuate within the value specified? | 0.2-2 V | Go to Step 4 | Go to Step 10 |
4 |
Is the problem found? | -- | Go to Step 9 | Go to Step 5 |
5 | Inspect for an open or short to ground between the EI system ignition coil connector terminal B and the ECM connector terminal C14. Is the problem found? | -- | Go to Step 7 | Go to Step 6 |
6 | Inspect for an open or short to ground between the EI system ignition coil connector terminal B and the ECM connector terminal C14 while moving the connectors and the wiring harness of the ignition circuit. Is the problem found? | -- | Go to Step 7 | Go to Step 8 |
7 |
Is the repair complete? | -- | System OK | -- |
8 | Inspect the wires and wiring harnesses of the ignition circuit for any damage that could cause an intermittent open or short to ground. Is the problem found? | -- | Go to Step 9 | Go to Step 11 |
9 |
Is the repair complete? | -- | System OK | -- |
10 |
Is the repair complete? | -- | System OK | -- |
11 |
Is the repair complete? | -- | System OK | -- |