With Throttle Body Injection (TBI)
Fig. 038 WIRING DIAGRAM for Chart A-3 Engine Cranks But Won't Run. VIN K:
CHART A-3
(Page 1 of 2)
ENGINE CRANKS BUT WON'T RUN
2.0L OHC (VIN K) "J" SERIES (TBI)
Circuit Description:
Before using this chart, battery condition, engine cranking speed, and fuel quantity should be checked and verified as being OK.
Fig. 037 Chart A-3 - Engine Cranks But Won't Run:
Test Description:
Number below refer to circled numbers on the diagnostic chart.
1. A "Service Engine Soon" light "ON" is a basic test to determine if there is a 12 volts supply and ignition 12 volts to ECM. No ALDL may be due to an ECM problem, and CHART A-2 will diagnose the ECM. If TPS is over 2.5 volts, the engine may be in the clear flood mode, which will cause starting problems. The engine will not start without reference pulses and, therefore, the "Scan" should read rpm (reference) during cranking.
2. If rpm was indicated during crank, the ignition module is receiving a crank signal, but "No Spark" at this test indicates the ignition module is not triggering the coil.
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. The test light should blink, indicating the ECM is controlling the injector OK. How bright the light blinks is not important. However, the test light should be a BT 8329 or equivalent.
5. Fuel spray from the injector indicates that fuel is available. However, the engine could be severely flooded due to too much fuel. No fuel spray from injector indicates a faulty fuel system or no ECM control of injector.
6. This test will determine if the ignition module is not generating the reference pulse, or if the wiring or ECM are at fault. By touching and removing test light to 12 volts on CKT 430, a reference pulse should be generated. If rpm is indicated, the ECM and wiring are OK.
Diagnostic Aids:
a. 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 re-occur until an overnight park is freezing temperatures.
b. An EGR sticking open can cause a low air/fuel rate during cranking. Unless engine enters "Clear Flood" at the first indication of a flooding condition it can result in a no start.
c. Fuel pressure: Low fuel pressure can result in a very lean air/fuel ratio. See CHART A-7.
CHART A-3
ENGINE CRANKS BUT WON'T RUN
2.0L OHC (VIN K) "J" SERIES (TBI)
Circuit Description:
Ignition voltage is supplied to the fuel injector on CKT 439. The injector will be pulsed (turned "ON" and "OFF") when the ECM opens and grounds injector drive CKT 487.
Fig. 039 Chart A-3 - Engine Cranks But Won't Run:
Test Description:
Numbers below refer to circled numbers on the diagnostic chart.
1. This check determines if injector connector has ignition voltage and only one terminal.
2. A faulty ECM may result in damage to the injector.
3. A test light connected from ECM harness terminal "W1" to ground should light due to continuity through the injector.