Chart A-3 - Engine Cranks But Will Not Start: Notes

Before using this chart, ensure battery condition, engine cranking speed, and fuel pressure and quantity are within specification.

1. An SES light on is a basic test to verify a 12-volt supply to ignition and ECM. If TPS reading is greater than 2.5 volts, the ECM may be in a clear flood mode, which will make starting difficult. The scan tester should read an RPM reference during cranking.
2. If RPM is indicated during cranking, the ignition module is receiving a crank signal. No spark at this test indicates the ignition module is not triggering the coil.
3. With fuel injector wiring disconnected, there should be no fuel spray when cranking engine. If fuel drips or leaks from injector, replace injector.
4. Use Test Light (BT-8329). Ensure test light blinks, indicating ECM is properly controlling injector.
5. Fuel spray from injector indicates fuel is available; however, the engine may be flooded. No fuel spray indicates a faulty fuel system or lack of injector control by ECM.
6. This test determines whether ignition module is not generating a reference pulse, or wiring and ECM are faulty. By touching and removing test light to 12 volts on circuit No. 430, a reference pulse should be generated. If reference pulse is generated, ECM and wiring are okay.
   NOTE: Ignition voltage is supplied to fuel injector on circuit No. 439. The injector will be pulsed (turned on and off) when ECM opens and grounds circuit No. 467.
7. No blinking light indicates no ECM control of injector, or wiring problem.
8. There is a remote possibility the resistance across the injector terminals is less than 1.2 ohms, and has resulted in a blown fuse for circuit No. 439. If this has happened, replace fuse and injector.