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Home >> Jeep >> 2001 >> Cherokee Classic, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1294: Target Idle Not Reached >> Testing
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DTC P1294: Target Idle Not Reached: Testing

  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed for DTC P1294 and displayed count is "0", go to step  3 . If GOOD TRIP counter for DTC P1294 is not displayed or displayed count is not "0", go to next step.
  2. Check FREEZE FRAME data on scan tool to determine the conditions when DTC was set. Attempt to duplicate conditions for added diagnosis. Recheck for DTCs. If DTC P1294: TARGET IDLE NOT REACHED reoccurs, go to next step. If DTC P1294: TARGET IDLE NOT REACHED does not reoccur, conditions to set DTC are not present at this time. Test is complete.
  3. Turn ignition on. Ensure throttle plate is fully closed against stop. Check throttle plate and linkage for binding. Repair throttle plate and linkage as necessary. If throttle plate and linkage are okay, go to next step.
  4. Start engine and allow it to idle for 60 seconds. If vehicle is equipped with A/T, apply brakes and shift gear selector to Drive. Using scan tool, read TARGET IDLE and ENGINE RPM. If engine RPM is within 100 RPM of target idle, go to next step. If engine RPM is not within 100 RPM of target idle, go to step  8 .
  5. Turn ignition off. Using scan tool, go to SYSTEM TESTS and select IAC WIGGLE TEST. Idle speed should vary while in wiggle test mode. If idle speed raises and lowers during wiggle test, go to next step. If idle speed does not raise and lower during wiggle test, perform DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS  test.
  6. Start engine and allow it to idle. Using scan tool, go to SYSTEM TESTS and select IAC WIGGLE TEST. While wiggling wiring harness between IAC motor and PCM, monitor engine RPM. IAC motor is located on throttle body. PCM is located in engine compartment on left front fender, near radiator support. If IAC motor stops operating at any time while wiggling wiring harness, repair wiring harness where wiggling caused IAC motor to stop operating. If IAC motor does not stop operating, go to next step.
  7. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, no problem is indicated at this time. Test is complete.
    NOTE: The following step is invalid if engine has any vacuum leaks.
  8. Start engine and allow it to idle. Check engine, brake booster and vacuum hoses for leaks. Ensure Closed Crankcase Ventilation (CCV) system is functioning properly. Repair vacuum leaks as necessary. If CCV system is okay and no vacuum leaks exist, go to next step.
  9. Start engine and allow it to idle for 60 seconds. Using scan tool, go to SYSTEM TESTS and select IAC WIGGLE TEST. Idle speed should vary while in wiggle test mode. If idle speed raises and lowers during wiggle test, go to next step. If idle speed does not raise and lower during wiggle test, perform DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS  test.
    10. WARNING: Clean throttle body in well ventilated area and wear rubber gloves.
  10. Turn ignition off. Remove throttle body. While holding throttle open, spray entire throttle body bore with appropriate cleaner. Using a soft scuff pad, clean throttle body bore and throttle plate. Using compressed air, dry throttle body. Install throttle body. Start engine and allow it to idle. Using scan tool, actuate MIN AIRFLOW. If engine speed is less than 550 RPM, replace throttle body. If engine speed is 550 RPM or more, no problem is indicated at this time. Test is complete.
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