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DTC P1294: Target Idle Not Reached

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: Target idle is monitored when engine has been idling and transaxle is in Drive. No DTCs must exist for Manifold Absolute Pressure (MAP) sensor or Throttle Position (TP) sensor in order to properly monitor target idle. DTC may be stored in Powertrain Control Module (PCM) if engine idle speed is more than 200 RPM than target idle or is not more than 100 RPM less than target idle for 14 seconds. Condition must exist 2 consecutive times in a row for DTC to be stored in PCM. Possible causes are; vacuum leak, defective throttle body, throttle plate or linkage improperly positioned, defective idle air control motor, or defective connectors or wiring.
  1. Start engine and allow engine to idle for 60 seconds. Using scan tool, read target idle speed and engine RPM. If engine RPM is within 100 PRM of the target idle, go to next step. If engine RPM is not within 100 PRM of the target idle, go to step  6 .
  2. With engine idling, use scan tool in SYSTEM TESTS and perform IAC WIGGLE test. Engine speed should increase and decrease in accordance with display on scan tool. If engine speed operates correctly, stop IAC wiggle test, and go to next step. If engine speed does not operate correctly, check for proper idle air control motor operation. See DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS  .
  3. Turn ignition off. Inspect wiring harness and connectors between idle air control motor and PCM. Idle air control motor is mounted on throttle body and contains a 4-pin connector. PCM is located at driver's side front corner of engine compartment, just below air cleaner assembly. If no problems exist, go to next step. If any problems exist, repair wiring or connectors as necessary. Perform TEST VER-2A  .
  4. Start engine and allow engine to idle. With engine idling, use scan tool in SYSTEM TESTS and perform IAC WIGGLE test. Wiggle wiring harness and connectors between idle air control motor and PCM while monitoring engine RPM. If idle air control motor does not stop operating while wiggling wiring harness and connectors, go to next step. If idle air control motor stops operating while wiggling wiring harness and connectors, repair wiring or connectors as necessary that caused idle air control motor to stop operating. Perform TEST VER-2A  .
  5. Shut engine off. Check throttle linkage and throttle plate in throttle body for binding condition. With throttle linkage at idle position, ensure throttle plate is fully closed and against its stop. If no binding condition exists and throttle plate fully closes, test is complete. If binding condition exists or throttle plate does not fully close, repair as necessary. Perform TEST VER-2A  .
  6. With engine idling, use scan tool in SYSTEM TESTS and perform IAC WIGGLE test. Engine speed should increase and decrease in accordance with display on scan tool. If engine speed operates correctly, stop IAC wiggle test, and go to next step. If engine speed does not operate correctly, check for proper idle air control motor operation. See DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS  .
  7. Check engine, engine vacuum hoses and brake booster for vacuum leaks. Ensure proper PCV valve is installed and PCV valve is operating correctly. If no vacuum leaks exist, correct PCV valve is used and PCV valve is operating correctly, go to next step. If vacuum leaks exist, incorrect PCV valve is used, or PCV valve is not operating correctly, repair as necessary. Perform TEST VER-2A  .
  8. With engine off, check throttle linkage and throttle plate in throttle body for binding condition. With throttle linkage at idle position, ensure throttle plate is fully closed and against its stop. If no binding condition exists and throttle plate fully closes, go to next step. If binding condition exists or throttle plate does not fully close, repair as necessary. Perform TEST VER-2A  .
  9. Disconnect PCV valve hose from intake manifold and cap vacuum port on intake manifold. Disconnect idle purge hose from throttle body. See Fig 1 . Using small vacuum hose, install Air Metering Fitting (6457) on idle purge hose fitting on throttle body.
    Fig 1: Locating Idle Purge Hose
    G95C14532Courtesy of DAIMLERCHRYSLER CORPORATION
  10. Start engine and allow engine to idle. Operate engine until engine coolant temperature is more than 180°F (82°C). Using scan tool manufacturer's instructions, actuate MINIMUM AIRFLOW and note engine RPM. If engine RPM is less than 550 RPM, go to next step. If engine RPM is 550 RPM or more, replace throttle body. Perform TEST VER-2A  .
  11. Remove throttle body. With throttle fully open on throttle body, clean throttle body with parts cleaner. Using soft brush or pad, ensure throttle body bore and throttle plate are clean. Dry throttle body with compressed air.
  12. Reinstall throttle body with air metering fitting installed on idle purge hose fitting on throttle body. Start engine. Using scan tool manufacturer's instructions, actuate MINIMUM AIRFLOW and note engine RPM. If engine RPM is 550 RPM or more, throttle body is okay. Test is complete. If engine RPM is less than 550 RPM, replace throttle body. Perform TEST VER-2A  .
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