Chart A-3 Engine Cranks But Will Not Run

Chart A-3 Engine Cranks But Won't Run:

Injector Circuit:

Circuit Description
Before using this chart, battery condition, engine cranking speed, and fuel quantity should be checked and verified as being OK.

Chart Test Description
Number(s) below refer to circled number(s) on the diagnostic chart.

1. ^ A MIL (Service Engine Soon) "ON" is a basic test to determine if there is battery and ignition voltage at the PCM.

^ No DLC data may be the result of a PCM problem, and CHART A-2 will diagnose a PCM problem. Related Tests, Information and Procedures

^ If Throttle Position (TP) sensor is less than .2 volt, the TP sensor 5 volt reference circuit could be shorted to ground. If TP sensor is over 2.5 volts, the PCM could be in the "Clear Flood Mode" which may cause the engine to not start.

^ Compare coolant temperature with intake air temperature when engine is cold. If coolant temperature reading is 10 degrees greater or less than intake air temperature on a cold engine, check resistance of the Engine Coolant Temperature (ECT) sensor circuit or sensor. Compare resistance value to the "Diagnostic Aid" chart found on DTC 14 chart. Powertrain Controls - ECM/PCM

2. Because the Electronic Ignition (EI) system uses two spark plugs and cables to complete the circuit of each coil, the companion spark plug cable should be connected to a good ground.

3. The test light should flash, indicating that the PCM is controlling the injectors. How bright the light flashes is not important.

4. Ignition may have to be cycled "ON" several times to obtain maximum fuel pressure.


Diagnostic Aids
^ Water or contamination in fuel system may cause a no start condition during very cold or freezing weather. The engine may start after approximately 5 minutes in a heated shop.

^ An EGR valve sticking open can cause a rich air/fuel ratio during cranking. Unless the PCM enters "Clear Flood Mode" at the first indication of a flooding condition, it may result in a no start condition.

^ A MAP sensor stuck between .5 and 2.5 volts can cause a no start condition. Disconnect the MAP sensor, if vehicle starts replace faulty sensor.