Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 4: This step tests for a short to ground in the ignition 1 voltage circuit.
- 5: This step test for a fault in the ignition 1 voltage circuit.
- 6: This step test for high resistance. Three ohms or more can cause can cause a driveability condition.
Electronic Ignition (EI) System Diagnosis
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Engine Controls? | - | Go to Step 2 | Go to Diagnostic System Check - Engine Controls |
| 2 |
IMPORTANT:
Do not perform this diagnostic procedure if you were not sent here from a misfire DTC or the Engine Cranks but Does Not Run diagnostic. Attempt to start the engine.Does the engine start and run? |
- | Go to Step 3 | Go to Step 4 |
| 3 | Observe the misfire current counters with a scan tool. Does the scan tool display any misfire current counters incrementing? |
- | Go to Step 7 | Go to Intermittent Conditions |
| 4 | Inspect the fuse that supplies the ignition 1 voltage to the ignition coil. Is the fuse open? |
- | Go to Step 9 | Go to Step 5 |
| 5 |
|
- | Go to Step 6 | Go to Step 8 |
| 6 | Test for high resistance in the ignition 1 voltage circuit of the ignition coil. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Is the resistance more than the specified value? |
4 ohms | Go to Step 10 | Go to Step 11 |
| 7 | Test for an intermittent and for a poor connection at the ignition coil. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 12 | Go to Step 11 |
| 8 | Repair the open in the ignition 1 voltage circuit of the coil. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 12 | - |
| 9 |
IMPORTANT:
The ignition 1 voltage circuit is shared with other components. Review the electrical schematic and diagnose the shared circuits and components. Repair the short to ground in the ignition 1 voltage circuit of the ignition coil. Refer to Wiring Repairs
in Wiring Systems.Replace the fuse.Did you complete the repair? |
- | Go to Step 12 | - |
| 10 | Repair the high resistance in the ignition 1 voltage circuit of the ignition coil. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 12 | - |
| 11 | Replace the ignition coil. Refer to Ignition Coil(s) Replacement
. Did you complete the replacement? |
- | Go to Step 12 | - |
| 12 |
|
- | Go to Step 13 | Go to Step 2 |
| 13 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
- | Go to Diagnostic Trouble Code (DTC) List | System OK |