DTC P050B
DTC P050B : Cold Start Ignition Timing Control System Performance Problem
| DTC Description | Confirmed DTC | Pending DTC |
|---|---|---|
| P050B Cold Start Ignition Timing Control System Performance Problem |
DTC (PGM-FI)
- 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 DTC (PGM-FI)
Are any Pending or Confirmed DTCs other than P050B indicated?
YES
Go to the indicated DTC's troubleshooting.
NO
Go to step 2.
- Intake air duct visual check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Check for 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, or replace it if needed .
- Air cleaner housing visual check
-1. Check for poor connection or blockage at the air cleaner housing .
Is it OK?
YES
Go to step 4.
NO
- 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.
- Problem verification
-1. Turn the vehicle to the ON mode.
-2. 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 Data List
-3. Clear the DTC with the HDS.
-4. Turn the vehicle to the OFF (LOCK) mode.
-5. Enter the maintenance mode, then start the engine , and let it idle for 10 seconds or more.
-6. 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 OBD Status
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, 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 5-2 and recheck.
- Determine possible failure area (CKP sensor, others)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Check the ignition timing .
Is the ignition timing OK?
YES
Go to step 8.
NO
Go to step 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 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 , then recheck. If DTC P050B goes away and the PCM was substituted, replace the original PCM .
- Throttle body test
-1. Turn the vehicle to the ON mode.
-2. Select the ETCS TEST in the Function Test Menu with the HDS.
ETCS TEST
Is the THROTTLE ACTUATOR CONTROL VALVE normal?
YES
Go to step 9.
NO
- MAF sensor performance check
-1. Enter the maintenance mode, then start the engine .
-2. Hold the engine speed at 3000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
-3. While holding the engine speed at 2500 RPM for 30 seconds, check the parameter(s) below with the HDS.
Signal Threshold Current conditions Values Unit Values Unit MAF Sensor 2.4-3.4 g/s Data List
Do the current condition(s) match the malfunction threshold?
YES
The MAF sensor is OK. Go to step 10.
NO
- 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. Observe the ambient temperature.
-4. Turn the vehicle to the ON mode.
-5. Quickly observe 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 Data List
-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 5.4 deg.F (3 deg.C) from the ambient temperature.
NO
The ECT sensors 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 , then recheck. If DTC P050B goes away and the PCM was substituted, replace the original PCM .
- Engine compression and cylinder leakdown
- Valve pause system
- Engine oil
- A/C system