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General Inspection

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  1. Ensure vehicle has adequate fuel and cranking speed is normal. Turn ignition off for 10 seconds. Turn ignition on, with engine off. Using scan tool, verify if communications can be established with the BCM and ECM. Check for DTCs. If scan tool communicates with BCM and ECM, go to next step. If scan tool does not communicate with BCM and ECM, diagnose network communications problem. See appropriate BODY CONTROL MODULES article.
  2. Check if there are any BCM/ECM PassLock(R) security system or communication DTCs present. If BCM DTCs are not present, go to next step. If BCM DTCs are present, see appropriate BODY CONTROL MODULES article.
  3. If ECM DTC P0601, P0602, P0603, P0604 or P0606 is set, diagnose affected DTC(s). See appropriate SELF-DIAGNOSTICS article. If ECM DTC P0601, P0602, P0603, P0604 or P0606 is not set, go to next step.
  4. If fuel injector DTCs P0201-P0206 are set. If DTCs P0201-P0206 are not set, go to next step. If DTCs P0201-P0206 are set, check ENG CNTL 2 fuse, located in underhood fuse block. Replace as necessary and retest. If fuse continues to open, check for short on injector circuits. If fuse is okay, repair open in ignition voltage circuit between fuel injectors and underhood fuse block. See WIRING DIAGRAMS article.
  5. Check if DTCs P0230, P0231, P0232 or P1403 is set. If any of the DTC is set, diagnose affected DTC(s). See appropriate SELF-DIAGNOSTICS article. If no DTC is set, go to next step.
  6. Using scan tool, monitor ENGINE SPEED while cranking engine. If RPM is not detected, diagnose using DTC P0335 diagnostic procedures. See appropriate SELF-DIAGNOSTICS article. If RPM is detected, go to next step.
  7. Check if DTC P0341, P0342 or P0343 is set. If any the DTC is set, diagnose affected DTC(s). See appropriate SELF-DIAGNOSTICS article. If no DTC is set, go to next step.
  8. Turn ignition on, with engine off. Check IGN fuse in underhood fuse block. Replace as necessary and retest. If fuse continues to open, check for short to ground in ignition circuit. If fuse is okay, go to next step.
  9. Using scan tool, perform IGNITION COIL CYL 1-6 test for each individual cylinder while listening closely for spark at appropriate ignition coil. Is spark audible on each cylinder? If yes, go to next step. If no, go to IGNITION DIAGNOSIS .
  10. Connect Fuel Pressure Gauge (SA9127E) to test port. Using scan tool, command fuel pump relay on for at least 5 seconds. If fuel pressure is 39-49 psi (2.7-3.4 kg/cm 2 ), go to next step. If fuel pressure is not 39-49 psi (2.7-3.4 kg/cm 2 ), go to FUEL DELIVERY SYSTEM .
  11. Turn ignition on, with engine off. Check for a normal MAF sensor voltage reading (0.8-1.2 volts), a normal closed EGR sensor voltage reading (0.5-1.0 volt) and a normal ECT sensor voltage (based on actual engine temperature). Are the 3 sensor readings within range? If yes, check for fouled spark plugs, restricted air induction, restricted exhaust, cam timing or engine mechanical failure. If no, diagnose affected sensor using appropriate DTC test procedures (MAF - P0101, EGR - P1406 or ECT - P0116).
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