Chart A-3 Engine Cranks But Will Not Run

Fig. 071 - Chart A-3 - Engine Cranks But Will Not Run:

Fig. 072 - Wiring Diagram for Chart A-3 Engine Cranks But Will Not Run. VIN O:

CHART A-3

ENGINE CRANKS BUT WON'T RUN
1.8L "J" SERIES



1. A "SERVICE ENGINE SOON" light "on" is a basic check for ignition and battery supply to the Electronic Control Module (ECM).
2. Fuel Spray from the injector indicates that fuel is available. However, the engine could be severely flooded due too much fuel.
3. While cranking engine there should be no fuel spray with injector disconnected. Replace the injector if it sprays fuel or drips like a leaking water faucet.
4. At this point the fuel system appears to be operating normally. Voltage at the spark plugs is checked using a ST-125 Spark Gap Tool. No spark indicates a basic HEI problem. If spark is OK the following checks should be made.
a. Throttle Position Sensor (TPS): If the sensor is sticking or binding in the wide open throttle position, the ECM will be in the 'Clear Flood' mode. The air/fuel ratio will be 18:1 to 20:1, and this may be to lean to start a cold engine.
b. Coolant Sensor: If the sensor signal circuit "opens" with ignition off, the ECM will think the coolant temperature is -40°F, (-40°C) and provide fuel for this, extremely cold temperature. The engine will be severely flooded, because the ECM cannot recognize an open coolant circuit until the engine has been running for 1 minute or more.
Check this circuit using CODE 15 Chart.
c. Water or foreign material can cause a no start during freezing weather. The engine may start after 5 or 6 minutes in a heated shop. The problem may not reoccur until an overnight park in freezing temperatures.
d. An EGR sticking open can cause a high air/fuel ratio during cranking. Unless engine enters "Clear Flood" at the first indication of a flooding condition, it can result in a no start.
e. An open crank signal may cause a no start during very cold weather. Chart C-1B.
f. Fuel pressure: Low fuel pressure or volume can result in a very lean air/fuel ratio. See Chart A-5.
5. The EFI system should be considered OK if no trouble was found. Reconnect injector an review Symptoms in DIAGNOSIS BY SYMPTOM for possible mechanical problems.
6. No fuel spray from injector indicates a faulty fuel system or no ECM control of injector. If the test light "blinks" while cranking, the ECM control should be considered OK. Be sure test light makes good contact between connector terminals during test. The light may be a little dim when 'blinking'. This is due No fuel spray from injector indicates a faulty fuel system or no ECM control of injector. If the test light "blinks" while cranking, the ECM control should be considered OK. Be sure test light makes good contact between connector terminals during test. The light may be a little dim when 'blinking'. This is due to current draw of the test light. How bright it "blinks" is not important. However, the test light bulb should be an 1847 or equivalent.