Ignition System No Start Test

NOTE: To prevent unnecessary diagnostic time and wrong test results, the previous Checking For Spark test should be performed prior to this test.

WARNING: SET PARKING BRAKE OR BLOCK THE DRIVE WHEELS BEFORE PROCEEDING WITH THIS TEST.

No Start Test:

1. Unplug the ignition coil harness connector at the coil.

2. Connect a set of small jumper wires (18 gauge or smaller) between the ignition coil and coil electrical connector.

3. Determine that sufficient battery voltage (12.4 volts) is present for the starting and ignition systems.

4. Crank the engine for 5 seconds while monitoring the voltage at the coil positive terminal:

^ If the voltage remains near zero during the entire period of cranking, refer to On-Board Diagnostics. Check the powertrain control module and auto shut down relay.

^ If voltage is at near battery voltage and drops to zero after 1-2 seconds of cranking, check the camshaft position sensor-to-powertrain control module circuit.

Engine Controller 60-Way Connector:

^ If voltage remains at near battery voltage during the entire 5 seconds, turn the key off. Remove the 60-way connector from the powertrain control module (PCM). Check 60-way connector for any spread terminals.

5. Remove test lead from the coil positive terminal. Connect an 18 gauge jumper wire between the battery positive terminal and the coil positive terminal.

Special Jumper - Ground To Coil Negative:

6. Make the special jumper shown above. Using the jumper, momentarily ground terminal-19 of the 60-way connector. A spark should be generated at the coil cable when the ground is removed.

7. If spark is generated, replace the PCM.

8. If spark is not seen, use the special jumper to ground the coil negative terminal directly.

9. If spark is produced, repair wiring harness for an open condition.

10. If spark is not produced, replace the ignition coil.