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Diagnostic Procedure

  1. If diagnostic system check has already been performed, go to next step. If diagnostic system check has not been performed, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 5.7L CORVETTE article.
  2. Turn ignition ON, with the engine OFF. Observe DTC information with a scan tool. Does scan tool display DTC P0230, DTC P0335, DTC P0336, DTC P0601, DTC P0602, DTC P0604, DTC P0606, DTC P1626, DTC 1631, or DTC 1683? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 5.7L CORVETTE article. If no, go to next step.
  3. Does the scan tool display any body control module (BCM) or Vehicle Theft Deterrent, (VTD) DTCs? If yes, see THEFT DETERRENT SYSTEM DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in appropriate ANTI-THEFT SYSTEMS article in ACCESSORIES & EQUIPMENT. If no, go to next step.
  4. Turn ignition ON, with the engine OFF. Probe both sides of fuses located in the underhood electrical center listed below using a test light connected to ground. See Fig 1 .
    • INJR 1
    • INJR 2
    Does the test light illuminate on at least one side of each fuse? If yes, go to next step. If no, test ignition relay. See IGNITION RELAY under MOTORS, RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - CORVETTE article.
  5. Command the fuel pump ON with a scan tool. Does the fuel pump operate? If yes, go to next step. If no, see FUEL PUMP ELECTRICAL CIRCUIT DIAGNOSIS  under FUEL SYSTEMS.
  6. Turn ignition OFF. Disconnect a spark plug wire. Install Spark Tester (J-26792). Attempt to start the engine. Does the spark tester spark? If yes, go to next step. If no, see ELECTRONIC IGNITION SYSTEM DIAGNOSIS  under IGNITION SYSTEMS.
  7. Turn ignition OFF. Install a fuel pressure gauge. See FUEL SYSTEM PRESSURE RELEASE  under FUEL SYSTEMS. Turn ignition ON, with the engine OFF. Command fuel pump ON with a scan tool. You may need to command the fuel pump ON a few times in order to obtain highest possible fuel pressure. Observe fuel pressure while fuel pump is operating. Is the fuel pressure within 55-62 psi (379-427 kPa)? If yes, go to next step. If no, see FUEL SYSTEM DIAGNOSIS  under FUEL SYSTEMS.
  8. Inspect for the following conditions:
    • Collapsed air intake duct.
    • Restricted air filter element.
    • Spark plugs for being fouled. If the spark plugs are fouled, determine what caused the condition.
    • Engine mechanical condition, for example, broken timing chain, low compression.
    • Restricted exhaust system.
    • Engine Coolant Temperature (ECT) sensor is NOT close to actual engine temperature. Refer to DTC P0125: EXCESSIVE TIME TO ENTER CLOSED LOOP under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 5.7L CORVETTE article.
    • Compare Manifold Absolute Pressure (MAP) parameter to another vehicle. The parameters should be close in value. Refer to DTC P0106: MAP SYSTEM PERFORMANCE under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 5.7L CORVETTE article.
    If problem found and corrected, go to next step. If no, diagnose by symptom. See SYMPTOMS in TROUBLE SHOOTING - NO CODES - 5.7L CORVETTE article.
  9. With a scan tool, clear DTCs. Attempt to start the engine. Does engine start and continue to operate? If yes, go to next step. If no, go to step  2 .
  10. Idle the engine. Allow engine to reach operating temperature. With a scan tool, observe DTC information. Are any DTCs displayed? If yes, see go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 5.7L CORVETTE article. If no, system is okay.
Fig 1: Identifying Underhood Fuse Block Details
G00232259Courtesy of GENERAL MOTORS CORP.
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