DTC P050B

DTC P050B  : Cold Start Ignition Timing Control System Performance Problem

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. PGM-FI system check

   -1. Turn the vehicle to the ON mode.

   -2. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC

   Are any Pending or Confirmed DTCs other than P050B indicated?

   YES 

   Go to the indicated DTC's troubleshooting.

   NO 

   Go to step 2.

2. Intake air tube visual check

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Check for a poor connection or blockage at the intake air tube .

   Is it OK?

   YES 

   Go to step 3.

   NO 

   Reconnect or repair the intake air tube.

3. Air cleaner housing visual check

   -1. Check for a poor connection or blockage at the air cleaner housing .

   Is it OK?

   YES 

   Go to step 4.

   NO 

   Replace the air cleaner housing .

4. Air cleaner element visual check

   -1. Check for dirt or debris on the air cleaner element .

   Is it dirty?

   YES 

   Replace the air cleaner element .

   NO 

   Go to step 5.

5. Problem verification

   -1. Let the engine cool until the value of ECT Sensor 1 is 122 deg.F (50 deg.C) or less.

   Signal	Current conditions
   	Values	Unit
   ECT Sensor 1

   -2. Clear the DTC with the HDS.

   -3. Enter the maintenance mode, then start the engine , and let it idle for 10 seconds or more.

   -4. Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS.

   DTC Description	OBD STATUS
   P050B Cold Start Ignition Timing Control System Performance Problem

   Does the HDS indicate FAILED?

   YES 

   The failure is duplicated. Go to step 6.

   NO 

   If the HDS indicates PASSED, there is an intermittent failure and the system is OK at this time. Check for poor connections or loose terminals at the CKP sensor, the throttle body, MAF sensor/IAT sensor 1, ECT sensor 1, ECT sensor 2, and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot . If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 5-1 and recheck.

6. Determine possible failure area (CKP sensor, others)

   -1. Check the ignition timing .

   Is the ignition timing OK?

   YES 

   Go to step 8.

   NO 

   Go to step 7.

7. CKP sensor and CKP pulse plate visual check

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Remove the CKP sensor .

   -3. Check for damage at the CKP sensor and CKP pulse plate.

   Is the CKP sensor and CKP pulse plate damaged?

   YES 

   Replace the CKP sensor and/or the CKP pulse plate .

   NO 

   The CKP sensor and the CKP pulse plate are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

8. Throttle body check

   -1. Select the ETCS(TAC) TEST in the Function Test Menu with the HDS.

   ETCS(TAC) TEST

   Is the THROTTLE ACTUATOR CONTROL VALVE normal?

   YES 

   Go to step 9.

   NO 

   Replace the throttle body .

9. MAF sensor performance check

   -1. Enter the maintenance mode, then start the engine .

   -2. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

   -3. While holding the engine speed at 2, 500 rpm for 30 seconds, check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   MAF Sensor	7.5 - 10.5	g/s

   Do the current condition(s) match the malfunction threshold?

   YES 

   Go to step 10.

   NO 

   Replace MAF sensor/IAT sensor 1 .

10. ECT sensor 1 and ECT sensor 2 performance check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Allow the engine to cool to ambient temperature.

    -3. Note the ambient temperature.

    -4. Turn the vehicle to the ON mode.

    -5. Quickly note the value of the ECT Sensor 1 and ECT Sensor 2 in the DATA LIST with the HDS.

    Signal	Current conditions
    	Values	Unit
    ECT Sensor 1
    ECT Sensor 2

    -6. Compare the value of ECT Sensor 1 and the value of ECT Sensor 2 with the ambient temperature individually.

    Does either sensor differ more than 5.4 deg.F (3 deg.C) from the ambient temperature?

    YES 

    Replace the sensor that differed more than 3 deg.C (5.4 deg.F) from the ambient temperature.

    NO 

    ECT sensor 1 and ECT sensor 2 are OK. Check and repair any problems with the following items. Repair or replace them if needed. If every item is OK, check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

    • Engine compression and cylinder leakdown
    • Engine oil
    • A/C system