DTC P050A: Cold Start Idle Air Control System Performance Problem
- Turn the ignition switch to ON (II).
- Check for Pending or Confirmed DTCs with the HDS.
Are any Pending or Confirmed DTCs other than P050A indicated?
YES -Go to the INDICATED DTC'S TROUBLESHOOTING .
NO -Go to step 3.
- Check for poor connections or a blockage at the intake air duct.
Is it OK?
YES -Go to step 4.
NO -Reconnect or repair the intake air duct, then go to step 19.
- Check for damage to the air cleaner housing.
Is it OK?
YES -Go to step 5.
NO -Replace the air cleaner housing (see AIR CLEANER ELEMENT INSPECTION/REPLACEMENT ), then go to step 19.
- Check for dirt or debris in the air cleaner element.
Is it dirty?
YES -Replace the air cleaner element or remove the debris (see AIR CLEANER ELEMENT INSPECTION/REPLACEMENT ), then go to step 19.
NO -Go to step 6.
- Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
- Clear the DTC with the HDS.
- Start the engine, and let it idle for 10 seconds or more.
- Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES -Go to step 10.
NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the ECM/PCM. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 and recheck.
- Do the ETCS TEST in the INSPECTION MENU with the HDS.
Is the THROTTLE ACTUATOR CONTROL VALVE normal?
YES -Go to step 11.
NO -Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ), then go to step 19.
- Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
- While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS.
Is there about 5.4-7.8 (M/T model) or 5.9-8.5 (A/T model) gm/s?
YES -Go to step H.
NO -Replace the MAF sensor/IAT sensor (see MAF SENSOR/IAT SENSOR REPLACEMENT ), then go to step 19.
- Turn the ignition switch to LOCK (0).
- Allow the engine to cool to ambient temperature.
- Note the ambient temperature.
- Turn the ignition switch to ON (II).
- Quickly note the value of IAT SENSOR in the DATA LIST with the HDS.
- Compare the value of the IAT SENSOR and the ambient temperature.
Does the value of the IAT SENSOR differ 5.4°F (3°C) or more from the ambient temperature?
YES -Replace the MAF sensor/IAT sensor (see MAF SENSOR/IAT SENSOR REPLACEMENT ), then go to step 20.
NO -Check for dirt, carbon, or damage in the throttle bore. If there is dirt or carbon, clean the throttle body (see AIR CLEANER ELEMENT INSPECTION/REPLACEMENT ), then go to step 20. If there is damage in the throttle bore, replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ), then go to step 20.
- Turn the ignition switch to ON (II).
- Reset the ECM/PCM with the HDS.
- Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
- Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
- Start the engine, and let it idle for 10 seconds or more.
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P050A indicated?
YES - Check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the ECM/PCM, then go to step 1.
NO -Go to step 26.
- Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 24, go to the INDICATED DTC'S TROUBLESHOOTING .
NO -If the screen indicates FAILED, check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the ECM/PCM, then go to step 1. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 22.