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Home >> Oldsmobile >> 1994 >> Achieva L4-138 2.3L VIN A FI HP >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> - Diagnosis By Symptom >> Engine Cranks, But Will Not Run >> Part II

Part II




ENGINE CRANKS BUT WILL NOT RUN 2.3L (VIN D, A & 3) "N" CARLINE










Circuit Description:
This engine is equipped with a distributorless ignition system called the Electronic Ignition (EI) system. The primary circuit of the EI system consists of two separate ignition coils, an electronic Ignition Control Module, (ICM) and Crankshaft Position (CKP) sensor as well as the related connecting wires and the Ignition Control (IC) portion of the Powertrain Control Module (PCM). Each secondary circuit consists of the secondary winding of the coil, two connecting metal strips molded into the coil housing, the spark plug boot/connector assemblies and spark plugs.

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

6. Battery voltage should be available at CKT 120 whenever the fuel pump power feed circuit is switched "ON." The PCM should switch the fuel pump "ON" for 2-3 seconds after ignition is turned "ON" (and when PCM is receiving ignition reference pulses, as while cranking or running). The ignition must be turned "OFF" for at least 10 seconds to assure that the PCM powers down and will then switch the fuel pump back "ON" for 2-3 seconds when ignition is turned back "ON."
7. Light "ON" one circuit only indicates power is available at cavity "A", but grounded circuit is not being completed on the other circuit. This could be due to open circuit or PCM not switching the injector driver circuit to ground.
8. Steady light indicates ground circuit is always completed and is not being switched. This could be due to short to ground in circuit, or faulty PCM injector driver.
9. The fuel pump should be switched "ON" by the PCM for 2-3 seconds after ignition is first turned "ON." It is necessary to turn the ignition "OFF" for at least 10 seconds to assure that the PCM powers down and will then switch the fuel pump back "ON." If the fuel pump operates, but power is not available at injector harness, CKT 120 must be open. If the fuel pump does not operate, CHART A-5 should be used to diagnose the cause.
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