Chart A3 (1 Of 2) - Engine Cranks But Won't Run: Notes

NOTE: Before performing this test, check battery condition (12 volts), engine cranking speed, and for adequate fuel in tank.

NOTE: Test numbers refer to test numbers on diagnostic chart.

A "SERVICE ENGINE SOON" light on is a basic test to determine if there is a 12-volt supply to the ECM. No ALDL may be due to an ECM problem and CHART A2 will diagnose the ECM. If TPS is over 2.5 volts, the engine may be into the clear flood mode which will cause starting problems. The engine will not start without reference pulses and therefore, the "SCAN" tester should read RPM (reference) during cranking.
No spark may be caused by one of several components related to the ignition system. CHART C-4 will address all problems related to the causes of a no spark condition.
Fuel spray from the injectors indicates that fuel is available. However, the engine could be severely flooded due to too much fuel.
While cranking engine, there should be no fuel spray with injector disconnected. Replace an injector if it sprays fuel or drips like a leaking water faucet.
The fuel pressure will drop after the fuel pump stops running due to a controlled bleed in the fuel system. Use of the fuel pressure gauge will determine if fuel system pressure is enough for engine to start and run.
No fuel spray from injector indicates a faulty fuel system or no ECM control of injector.
This test will determine if the ignition module is not generating the reference pulse, of if the wiring or ECM are at fault. Using a test light connected to 12-volts, touch circuit No. 430, a reference pulse should be generated. If injector test light blinks, the ECM and wiring are okay.