No Start (NS) Description

Fig 20 Ignition Coil Engine Harness Connector:

NOTE: This no-start test checks the camshaft position sensor and crankshaft position sensor.

OPERATION
The Powertrain Control Module (PCM) supplies 8 volts to the camshaft position sensor and crankshaft position sensor through one circuit. If the 8 volt supply circuit shorts to ground, neither sensor will produce a signal (output voltage to the PCM).

When the ignition key is turned and left in the On position, the PCM automatically energizes the Auto Shutdown (ASD) relay. However, the controller de-energizes the relay within one second because it has not received a camshaft position sensor signal indicating engine rotation.

During cranking, the ASD relay will not energize until the PCM receives a camshaft position sensor signal. Secondly, the ASD relay remains energized only if the controller senses a crankshaft position sensor signal immediately after detecting the camshaft position sensor signal.

TEST
1. Check battery voltage.
- Voltage should be approximately 12.66 volts or higher to perform failure to start test.
2. Disconnect the harness connector from the coil pack.
3. Connect a test light to the B+ (battery voltage) terminal of the coil electrical connector and ground as shown in (Fig. 20).
- The B+ wire for the DIS coil is dark green with an orange tracer
- Do not spread the terminal with the test light probe.
4. Turn the ignition key to the ON position.
- The test light should flash On and then Off.
- Do not turn the Key to off position, leave it in the On position.
a. If the test light flashes momentarily, the PCM grounded the Auto Shutdown (ASD) relay. Proceed to step 5.
b. If the test light did not flash, the ASD relay did not energize. The cause is either the relay or one of the relay circuits. Use the DRB or scan tool to test the ASD relay and circuits. Refer to the appropriate Powertrain Management Diagnostic Procedure.