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Home >> Eagle >> 1998 >> Talon Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Self-Diagnostics - With Codes >> DTC Test >> Test TC-138A: Target Idle Not Reached

Test TC-138A: Target Idle Not Reached

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. Turn ignition on with engine off. Check throttle plate and linkage for binding. Ensure throttle linkage is at idle position. Repair either condition as required. Perform TEST VER-2A . If both conditions are okay, go to next step.
  2. Start engine. Allow engine to idle for one minute. Using scan tool, read target idle and engine RPM. If engine RPM is within 200 RPM of target idle, go to step 5)  . If engine RPM is not within 200 RPM of target idle, go to next step.
    NOTE: For remainder of this test to be valid, engine must not have any vacuum leaks.
  3. Verify PCV valve is correct application and operating properly. If PCV valve is correct and operating properly, go to next step. If PCV valve is not correct or operating properly, repair as necessary. Perform TEST VER-2A .
  4. Start engine. With engine warm, using scan tool, actuate Idle Air Control (IAC) wiggle test. Idle speed should raise and lower with scan tool display. If idle speed changes with scan tool display, go to TEST TC-138B . If idle speed does not change with scan tool display, go to TEST TC-25A .
  5. Condition to set trouble code is not present at this time. TARGET IDLE NOT REACHED DTC sets if engine speed is not within 200 RPM greater than or 100 RPM less than target idle for 14 seconds. On Avenger, Breeze, Cirrus, Sebring Convertible, Sebring Coupe, Stratus and Talon, 2 trips are required to set code. On Neon, code will set in one trip. On all models, possible causes are: Idle Air Control (IAC) driver circuit shorted to ground, IAC driver circuit shorted to battery, IAC driver circuits shorted together, failed Powertrain Control Module (PCM), shorted IAC motor, engine carbon deposits, open IAC driver circuit, faulty connections or wiring, large vacuum leak, throttle misadjusted (minimum airflow RPM wrong) or throttle not closing reliably. Go to next step.
  6. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, go to next step. If related wiring and connectors were repaired, perform TEST VER-2A .
  7. Start engine. With engine warm, using scan tool, actuate Idle Air Control (IAC) wiggle test. Idle speed should raise and lower with scan tool display. If idle speed changes with scan tool display, go to next step. If idle speed does not change with scan tool display, go to TEST TC-25A 
  8. Observe engine RPM. Wiggle wiring harness from IAC motor to PCM. If IAC motor operates uninterrupted, go to next step. If IAC motor stops operating at any time, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-2A .
  9. Stop IAC wiggle test. See INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-2A .
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