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DTC P050B: Cold Start Ignition Timing Control System Performance Problem: Notes

Fig 1: DTC Troubleshooting Flow Chart (P050B)
G08875723Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information  See HOW TO TROUBLESHOOT THE A/T SYSTEM or HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
DTC Description Confirmed DTC Pending DTC Freeze Frame
P050B COLD START IGNITION TIMING CONTROL SYSTEM PERFORMANCE PROBLEM      
  1. PGM-FI system check:
    • 1. Turn the ignition switch to ON (II).
    • 2. Check for Pending or Confirmed DTCs with the HDS.
      DTC Description Confirmed DTC Pending DTC Freeze Frame
             

    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 duct visual check:
    • 1. Check for a poor connection or blockage at the intake air duct.

    Is it OK? 

    YES  : Go to step 3.

    NO  : Reconnect or repair the intake air duct, then do the repair verification  .

  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 , then do the repair verification  .

  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 , then do the repair verification  .

    NO  : Go to step 5.

  5. Problem verification:
    • 1. Let the engine cool until the value of ECT SENSOR 1 is 122 °F (50 °C) or less.
      Signal Current conditions
      Values Unit
      ECT SENSOR 1    
    • 2. Clear the DTC with the HDS  See HOW TO TROUBLESHOOT THE A/T SYSTEM or HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
    • 3. Start the engine, and let it idle for 10 seconds or more.
    • 4. Monitor the OBD STATUS for DTC P050B 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, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step  1. and recheck.

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

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

    Is the CKP sensor and/or the CKP pulse plate damaged? 

    YES  : REPLACE THE CKP SENSOR and/or the CKP PULSE PLATE , then do the repair verification  .

    NO  : The CKP sensor and the CKP pulse plate is OK. Update the PCM  See PCM REMOVAL AND INSTALLATION or PCM UPDATE if it does not have the latest software, or substitute a known-good PCM  See PCM REMOVAL AND INSTALLATION or PCM UPDATE , then do the repair verification  .

  8. Throttle body test:
    • 1. Do the ETCS TEST with the HDS.

    Is the THROTTLE ACTUATOR CONTROL VALVE normal? 

    YES  : The throttle body is OK. Go to step 9.

    NO  : Replace the throttle body  See THROTTLE BODY DISASSEMBLY AND REASSEMBLY , THROTTLE BODY REMOVAL AND INSTALLATION or THROTTLE BODY CLEANING , then do the repair verification  .

  9. MAF sensor performance check:
    • 1. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
    • 2. 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 7.0-8.6 g/s    

    Do the current condition(s) match the threshold? 

    YES  : The MAF sensor is OK. Go to step 10.

    NO  : REPLACE THE MAF SENSOR/IAT SENSOR , then do the repair verification  .

  10. ECT sensor 1 and ECT sensor 2 performance check:
    • 1. Turn the ignition switch to LOCK (0).
    • 2. Allow the engine to cool to the ambient temperature.
    • 3. Note the ambient temperature.
    • 4. Turn the ignition switch to ON (II).
    • 5. Quickly note the value of 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 to the ambient temperature individually.

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

    YES  : Replace the sensor that differed more than 5.4 °F (3 °C) from the ambient temperature, then do the repair verification  .

    NO  : The ECT sensors are OK. Check and repair any problems with the following items. Repair or replace them if needed, then do the repair verification  . If every item is OK, update the PCM  See PCM REMOVAL AND INSTALLATION or PCM UPDATE if it does not have the latest software, or substitute a known-good PCM  See PCM REMOVAL AND INSTALLATION or PCM UPDATE , then do the repair verification  .

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