Chart A3 (2 Of 2) - Engine Cranks But Won't Run
This test assumes that battery condition and engine cranking speed are okay, and there is adequate fuel in the tank.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- No fuel spray from one injector indicates a faulty fuel injector or no ECM control of injector. If the test light blinks while cranking, then ECM control should be considered okay. Be sure test light makes good contact between connector terminals during test. The light may be a little dim when its blinking. This is due to current draw of the test light. How bright the blinks is not important.
- Circuits No. 481 and 482 supply ignition voltage to the injectors. Probe each connector terminal with test light to ground. There should be a light on at one terminal. If the test light confirms ignition voltage at the connector, the ECM injector control circuits No. 467 and 468 may be open. Reconnect the injector and using a test light connected to ground, check at the applicable ECM connector terminal "D14" or "D16". A light at this point indicates that the injector drive circuit is okay. If an ECM repeat failure has occurred, the injector is shorted. Replace the injector and ECM.