Engine Fails to Start, Quick Test

FAULT DIAGNOSIS, ENGINE FAILS TO START, QUICK TEST

1. Checking The Fuses
Check that the following fuses are intact:
- 23 (+30 supply to control module)
- 13 (+15 supply to control module)
- 14 (fuel pump relay's supply to fuel pump)

2. Checking the CHECK ENGINE lamp (MIL)
Generate a DTC in the Trionic control module.
Unplug the intake air temperature sensor 5 2-pin connector (diagnostic trouble code P0108 will be generated when the control module is en ergized).
Ignition switch in the ON position. Check that the CHECK ENGINE lamp (MIL):
- Lights up and stays on for about 3 seconds.
- Goes out for about 3 seconds.
- Flashes the trouble code, 2 flashes after 10-15 seconds.

IMPORTANT: If the Trionic control module has stored another DTC there may be a different number of flashes.

Diagnostic trouble code readouts with lamp flash codes. In the DTC table it can be seen that diagnostic trouble code P0108 is denoted by 2 lamp flashes. Engine Control Systems

If the CHECK ENGINE lamp (MIL) does not work as described above, the control module has no +30 supply, +15 supply or connection to ground. See diagnostic trouble code P1500. P1500

Also check the fuel level.






3. Checking The Main Relay And Crankshaft Position Sensor
Since the main relay supplies the injectors and ignition discharge module with voltage, check the operation of the main relay as follows:
- Connect the test lamp to pins 10 and 6 of the ignition discharge module's connection
- Turn the ignition switch to the OFF position and remove fuse 23 for 5 seconds.
- Refit fuse 23
- Ignition switch in the ON position - check that the test lamp lights up for about 6 seconds and then goes out. If it does not, see fault diagnosis, main relay. Main Relay

When the test lamp goes out, run the starter motor. The test lamp should then light up again. If it does not, the control module is receiving no information from the crankshaft position sensor, see diagnostic trouble code P0335. P0335

4. Checking The Fuel Pump Relay
Since the fuel pump relay supplies power to the fuel pump, check the operation of this relay as follows:
- Turn the ignition switch to the OFF position. Remove fuse 23 for 5 seconds.
- Refit fuse 23.
- Ignition switch in the ON position - listen for the sound of the fuel pump working. It should run for about 2 seconds. If it does not, see fault diagnosis, fuel pump relay/fuel pump. Fuel Pump Relay / Fuel Pump





5. Additional Checks
- Check that the injectors are receiving power from the main relay. If they are not, check the lead between crimped connections J67 and J37.
- Check that the ignition discharge module produces sparks. If it does not, see fault diagnosis, ignition - engine fails to start. Engine Fails to Start

- Check that fuel is delivered under pressure.