Chart A-3, Engine Cranks But Will Not Run: Notes

Before using this chart, battery condition, engine cranking speed and fuel pressure and quantity must be verified as within specification.

Test Number 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.

Test Number 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.

Test Number 3)  With fuel injector wiring disconnected, there should be no fuel spray when cranking engine. If fuel drips or leaks from injector, replace injector.

Test Number 4)  Using Test Light (BT-8329), ensure the test light blinks indicating the ECM is controlling the injector okay.

Test Number 5)  Fuel spray from injector indicates fuel is available; however, the engine could be flooded. No fuel spray indicates a faulty fuel system or lack of injector control by ECM.

Test Number 6)  This test will determine if ignition module is not generating a reference pulse, or if wiring or ECM are faulty. By touching and removing a test light to 12 volts on circuit No. 430, a reference pulse should be generated. If reference is generated, ECM and wiring are okay.

Test Number 7)  No blinking light indicates no ECM control of injector, or wiring problem.

Test Number 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.