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DTC P1294: Target Idle Not Reached: Testing

NOTE: Fixed Orifice Adapter (6457) is needed to perform the following test.
  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step  10 .
  2. Start engine and let it idle for 60 seconds. Using scan tool, select SYSTEMS TEST, then IAC WIGGLE TEST. Idle speed should increase and decrease with scan tool display. If idle speed increases and decreases correctly, go to next step. If idle speed does not increase and decrease correctly, go to step  6 .
  3. Check vacuum hoses for leaks. Check for internal engine vacuum leaks. If no leaks are found, go to next step. If any leaks are found, repair as necessary.
  4. Check air intake system for restrictions or leaks. If no problems are found, go to next step. If any problems are found, repair as necessary.
  5. Inspect throttle plate for carbon build-up or other restrictions. Inspect throttle linkage for binding. Ensure throttle plate is touching throttle stop at idle. If no problems are found, go to next step. If any problems are found, repair as necessary.
  6. Turn ignition off. Disconnect IAC motor harness connector located on side of throttle body, below TP sensor. Start engine and let it idle. Using a test light connected to ground, probe each IAC motor harness connector terminal for 10 seconds. If test light flashes while probing each IAC driver circuit, go to next step. If test light does not flash while probing each IAC driver circuit, go to step  8 .
  7. Using a test light connected to battery positive, probe each IAC motor harness connector terminal for 10 seconds. If test light flashes while probing each IAC driver circuit, replace IAC motor. If test light does not flash while probing each IAC driver circuit, replace PCM.
  8. Turn ignition off. Disconnect PCM harness connectors. See Figure . Measure resistance of IAC driver circuit between IAC motor harness connector and PCM C2 harness connector that indicated no test light flashing. See WIRING DIAGRAMS article. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in appropriate IAC driver circuit.
  9. If no other possible causes are remaining, replace PCM.
  10. Start engine and let it idle for 60 seconds. Using scan tool, select SYSTEMS TEST, then IAC WIGGLE TEST. Idle speed should increase and decrease with scan tool display. If idle speed increases and decreases correctly, go to next step. If idle speed does not increase and decrease correctly, check IAC motor. See IDLE CONTROL SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article.
  11. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
    • Ensure throttle linkage operates smoothly. Ensure throttle plate is fully closed at idle.
    • With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
    • Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
    • Refer to any technical service bulletins that may apply.
    • Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
    • Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.

    If a problem is found, repair as necessary. If no problems are found, test is complete.

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