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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
  2. Turn ignition switch to RUN position, engine OFF. Observe the DTC Information using a scan tool. Does the scan tool display DTCs P0336, P0601, P0602, P1621, P1631, or P1632? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article. If no, go to next step.
  3. Does the scan tool display any Body Control Module (BCM) Vehicle Theft Deterrent (VTD) DTCs? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article. If no, go to next step.
  4. Attempt to start the engine. Monitor the CKP activity counter while the engine is cranking with a scan tool. Does the CKP activity counter increment while cranking the engine? If yes, go to next step. If no, go to ELECTRONIC IGNITION SYSTEM DIAGNOSIS under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  5. Using a scan tool, command the fuel pump ON. Does the fuel pump operate? If yes, go to next step. If no, go to FUEL INJECTOR CIRCUIT DIAGNOSIS under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
    6. NOTE: Not grounding the ignition coil housing, may cause erratic spark.
  6. Turn ignition switch to OFF position. Remove the ignition coil housing. Install a jumper wire with clips on both ends from the top of the Ignition Control Module (ICM) to ground. Install the Ignition System Diagnostic Harness (J 36012-A), or equivalent. Install Spark Tester (J 26792), or equivalent, on No. 1 spark plug jumper wire. Ground No. 4 (companion to No. 1) spark plug jumper wire. Crank the engine with the remaining spark plug jumper wires connected. Repeat the above steps by installing the spark tester on No. 4 and grounding No. 1. Do the same for No. 2 and No. 3 spark plugs. Ensure the companion wire is grounded. Does the spark tester spark on all cylinders? If yes, go to next step. If no, go to ELECTRONIC IGNITION SYSTEM DIAGNOSIS under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  7. Turn ignition switch to OFF position. Disconnect an injector harness connector. Install Injector Test Light (J 34730-405), or equivalent, to the injector connector. Attempt to start the engine. Does the test light blink while the engine is cranking? If yes, go to next step. If no, go to FUEL INJECTOR CIRCUIT DIAGNOSIS under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  8. Turn ignition switch to OFF position. Connect Fuel Pressure Gauge (J 34730-1A), or equivalent, to the fuel pressure connection, located on the fuel rail. See Fig 1. Turn ignition switch to RUN position, engine OFF. Command the fuel pump ON using a scan tool. Is the fuel pressure 50-60 psi (345-414 kPa) while the fuel pump is operating? If yes, go to next step. If no, go to FUEL SYSTEM DIAGNOSIS (GASOLINE)  or FUEL SYSTEM DIAGNOSIS (CNG)  .
  9. Check for the following conditions:
    • Collapsed air intake duct.
    • Restricted air filter element.
    • Check spark plugs for gas or coolant fouling. If the spark plugs are fouled, determine what caused the condition. Repair as necessary.
    • Engine mechanical condition, worn timing chain and gears, low compression. See MECHANICAL INSPECTION .
    • Restricted exhaust system. Go to RESTRICTED EXHAUST under SYMPTOMS in TROUBLE SHOOTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
    • The Engine Coolant Temperature (ECT) sensor is NOT close to the actual engine temperature. Go to DTC P0117: ENGINE COOLANT TEMPERATURE SENSOR or DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
    • Compare Manifold Absolute Pressure/Throttle Position (MAP/TP) parameters to another vehicle. The parameters should be close in value. Go to DTC P0105: MANIFOLD ABSOLUTE PRESSURE SENSOR under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
    Did you complete the action? If yes, go to next step.
  10. Using the scan tool, clear the DTCs. Turn ignition switch to OFF position for 30 seconds. Attempt to start the engine. Does the engine start, then continue to run? If yes, go to next step. If no, go to step  2.
  11. Allow the engine to reach operating temperature. Observe the DTC information using a scan tool. Are there any DTCs that have not been diagnosed? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS under SELF-DIAGNOSTICS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article. If no, system is okay at this time.
Fig 1: Connecting Fuel Pressure Gauge (J 34730-1A)
G00217341Courtesy of GENERAL MOTORS CORP.
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