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Diagnostic Procedures

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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® 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, P0606 or P0610 is set, diagnose affected DTC(s). See SELF-DIAGNOSTICS - 3.0L SATURN VUE article. If ECM DTC P0601, P0602, P0603, P0604, P0606 or P0610 is not set, go to next step.
  4. Check 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 INJ/MAN 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.
  5. Check if DTCs P0628 or P0629 is set. If any of the DTC is set, diagnose affected DTC(s). See SELF-DIAGNOSTICS - 3.0L SATURN VUE 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 SELF-DIAGNOSTICS - 3.0L SATURN VUE article. If RPM is detected, go to next step.
  7. Turn ignition on, with engine off. Check ENG/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.
  8. 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, diagnose ignition system. See IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - TRUCKS - EXCEPT TRACKER article.
  9. Connect Fuel Pressure Gauge (SA9127E) to fuel line test port. Using scan tool, command fuel pump relay on for at least 5 seconds. If fuel pressure is 50-60 psi (3.5-4.2 kg/cm 2 ), go to next step. If fuel pressure is not 50-60 psi (3.5-4.2 kg/cm 2 ), diagnose fuel system.
  10. Turn ignition on, with engine off. Check for a normal MAF sensor voltage reading (0.8-1.2 volts) and a normal ECT sensor voltage (based on actual engine temperature). Are 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 (P0101 - MAF or P0116 - ECT). See SELF-DIAGNOSTICS - 3.0L SATURN VUE article.
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