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Diagnostic Procedures

  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.4L AZTEK & RENDEZVOUS article. After performing diagnostic system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, check for DTCs. If DTCs P0101, P0230, P0336, P0601, P0602, P1626, P1630 or P1631 are set, diagnose DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 3.4L AZTEK & RENDEZVOUS article. If DTC(s) are not set, go to next step.
  3. Using a test light, probe both sides of the following fuses: ELEC, ENG and Fuel INJ fuses. Does test light illuminate on at least one side of the fuses listed? If yes, go to next step. If no, diagnose or replace ignition relay.
  4. Turn ignition off. Disconnect a spark plug wire. Install a Spark Tester (J 26792) to spark plug wire. Attempt to start engine. Is spark present at spark tester? If yes, go to next step. If no, diagnose electronic ignition system. See IGNITION SYSTEMS  .
  5. Using scan tool, command fuel pump ON. Does the fuel pump turn on? If yes, go to next step. If no, diagnose fuel pump electrical circuit. See FUEL SYSTEMS  .
  6. While monitoring the cylinder 1-6 injector circuit status parameters with scan tool, crank engine. Do all of the Cylinder Injector Circuit Status parameters display OK while cranking the engine? If yes, go to next step. If no, diagnose fuel injector. See FUEL INJECTOR COIL TEST under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 3.4L AZTEK & RENDEZVOUS article.
  7. Turn ignition off. Reinstall all disconnected components. Install Fuel Pressure Gauge (J 34730-1A). Turn ignition on, with engine off. Using scan tool, command fuel pump on. Is fuel pressure within 52-59 psi (358-405 kPa)? If yes, go to next step. If no, perform fuel system diagnosis. See FUEL SYSTEMS  .
  8. Check for collapsed air intake duct, restricted air filter element, fouled spark plugs, engine mechanical condition or restricted exhaust system. Check ECT sensor value (ECT sensor is NOT close to actual engine temperature), compare MAP/BARO parameters to another vehicle (parameters should be close in value) or check TP sensor for being stuck in range. Did you find and correct the condition? If yes, go to next step. If no, problem is intermittent.
  9. Using scan tool, clear any DTCs that are set. Attempt to start engine. Does engine start and continue to operate? If yes, go to next step. If engine does not start, go to step  2 .
  10. Allow engine to reach operating temperature. Observe DTC information on scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, diagnose affected DTC. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 3.4L AZTEK & RENDEZVOUS article. If no, system is okay.
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