| DTC Code | DTC Name |
|---|---|
| P050B00 | Cold Start Ignition Timing Performance |
MONITOR DESCRIPTION
A monitor will run when the engine is started at an engine coolant temperature of -10 to 50°C (14 to 122°F). If certain conditions are met, a DTC is stored after the engine idles for 15 seconds (2 trip detection logic).
This DTC is designed to monitor the ignition timing at cold start. When the engine is started at an engine coolant temperature of less than 50°C (122°F), the ECM checks the ignition timing during engine idling. If the ignition timing advances beyond the specified level within 10 seconds, the ECM interprets this as a malfunction, illuminates the MIL and stores this DTC.
The idle speed control learned values are cleared by performing learning value reset. Idle speed control learning needs to be performed before this DTC can be stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P050B00 | Cold Start Ignition Timing Performance | Ignition timing insufficiently retarded at cold start (2 trip detection logic). |
|
Comes on | DTC stored | SAE: P050B |
MONITOR STRATEGY
| Required Sensors/Components (Main) | Throttle body with motor assembly |
| Required Sensors/Components (Related) | Engine coolant temperature sensor Mass air flow meter sub-assembly |
| Frequency of Operation | Once per driving cycle |
TYPICAL MALFUNCTION THRESHOLDS
| Accumulated time when ignition timing retard is cut off | 8 seconds or more |
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG).
Turn the GTS on.
Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).
Start the engine and warm it up for 5 minutes or more.
Stop the engine.
Leave the vehicle outside overnight.
Turn the power switch on (IG) [A].
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
Check that the value of the Data List item Coolant Temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).
Start the engine and warm it up until the engine coolant temperature is the same as the coolant temperature in the freeze frame data.
Idle the engine for 1 minute or more [B].
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTC.
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P050B00.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL |
|
| ABNORMAL |
|
| INCOMPLETE |
|
If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system is malfunctioning.
If the judgment result shows INCOMPLETE, idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] and [B] again.
CAUTION / NOTICE / HINT
Inspect the fuses for circuits related to this system before performing the following procedure.
Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
DTC P050B00 may be set when the engine has the symptoms listed below. If necessary, check the trouble areas listed below.
| Symptoms | Factor | Trouble Area |
|---|---|---|
| Low idle speed when engine is cold (immediately after engine start) |
Excessive engine friction | Engine oil deterioration |
| Rough idle when engine is cold (immediately after engine start) |
Abnormal combustion | Fuel quality |
Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
PROCEDURE
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B00)
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
If any DTCs other than P050B00 are output, troubleshoot those DTCs first.
GO TO DTC CHARTClick here
READ VALUE USING GTS (FUEL TRIM)
Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter sub-assembly.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).
| Tester Display |
|---|
| Inspection Mode |
Start the engine.
Enter the following menus: Powertrain / Engine / Data List / Short FT B1S1, Long FT B1S1, Short FT B2S1 and Long FT B2S1.
| Tester Display |
|---|
| Short FT B1S1 |
| Short FT B2S1 |
| Long FT B1S1 |
| Long FT B2S1 |
Read the values displayed on the GTS at engine idle.
Add the Short FT B1S1 and Long FT B1S1 values, and the Short FT B2S1 and Long FT B2S1 values to obtain the total fuel trim.
| Standard |
|---|
| Total of Short FT B1S1 and Long FT B1S1 values, and total of the Short FT B2S1 and Long FT B2S1 values is between -20 and 20%. |
| Result | |||
|---|---|---|---|
|
INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)
Check for foreign matter between the throttle valve and housing. If necessary, clean the throttle body with motor assembly. Also, check that the throttle valve moves smoothly.
| OK |
|---|
| Throttle valve is not contaminated with foreign matter and moves smoothly. |
| Result | |||
|---|---|---|---|
|
PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).
| Tester Display |
|---|
| Inspection Mode |
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.
The A/C switch and all accessories should be off.
Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure and Engine Independent.
| Active Test Display |
|---|
| Control the EGR Step Position |
| Data List Display |
|---|
| Intake Manifold Absolute Pressure |
| Engine Independent |
Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.
Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.
| OK |
|---|
| The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate". |
| Standard | ||||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.
| Result | |||
|---|---|---|---|
|
GO TO STEP 14
INSPECT EGR VALVE ASSEMBLY
Remove the EGR valve assembly.
Check if the EGR valve is stuck open.
| OK |
|---|
| EGR valve is tightly closed. |
| Result | |||
|---|---|---|---|
|
GO TO STEP 14
GO TO STEP 17
REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY
Replace the throttle body with motor assembly.
Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
| Result | ||
|---|---|---|
|
GO TO STEP 21
CHECK PCV HOSE CONNECTIONS
Check the PCV hose connections.
| OK |
|---|
| PCV valve and hose are connected correctly and are not damaged. |
| Result | |||
|---|---|---|---|
|
CHECK INTAKE SYSTEM
Check the intake system for vacuum leaks.
| OK |
|---|
| No leaks from intake system. |
| Result | |||
|---|---|---|---|
|
CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
Visually check that the air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.
| OK |
|---|
| The air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil. |
| Result | |||
|---|---|---|---|
|
PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).
| Tester Display |
|---|
| Inspection Mode |
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.
The A/C switch and all accessories should be off.
Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure and Engine Independent.
| Active Test Display |
|---|
| Control the EGR Step Position |
| Data List Display |
|---|
| Intake Manifold Absolute Pressure |
| Engine Independent |
Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.
Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.
| OK |
|---|
| The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate". |
| Standard | ||||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.
| Result | |||
|---|---|---|---|
|
GO TO STEP 12
INSPECT EGR VALVE ASSEMBLY
Remove the EGR valve assembly.
Check if the EGR valve is stuck open.
| OK |
|---|
| EGR valve is tightly closed. |
| Result | |||
|---|---|---|---|
|
PERFORM ACTIVE TEST USING GTS (OPERATE CAM TIMING OIL CONTROL SOLENOID ASSEMBLY)
Operate the VVT system through the Active Test, and check if the VVT system is operating normally.
Perform the Active Test, referring to DTC P001100 Procedure (VVT system for intake camshaft).
Perform the Active Test, referring to DTC P001400 Procedure (VVT system for exhaust camshaft).
| Result | |||
|---|---|---|---|
|
READ VALUE USING GTS (MASS AIR FLOW SENSOR)
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).
| Tester Display |
|---|
| Inspection Mode |
Start the engine.
Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.
| Tester Display |
|---|
| Engine Speed |
| Mass Air Flow Sensor |
| Coolant Temperature |
Allow the engine to idle until Coolant Temperature is 75°C (167°F) or higher.
Read Mass Air Flow Sensor with the engine speed at 2500 rpm.
During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, read the Data List after charge control has completed.
| Standard | ||||||
|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
GO TO STEP 23
CLEAR DTC
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs.
Turn the power switch off and wait for at least 30 seconds.
| Result | ||
|---|---|---|
|
CHECK WHETHER DTC OUTPUT RECURS (DTC P050B00)
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
| Tester Display |
|---|
| Coolant Temperature |
Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).
| Tester Display |
|---|
| Inspection Mode |
Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
| Tester Display |
|---|
| All Readiness |
Input the DTC: P050B00.
Check the DTC judgment result.
| Result | ||||||
|---|---|---|---|---|---|---|
|
CHECK FOR INTERMITTENT PROBLEMSClick here
GO TO STEP 23
CHECK AND REPAIR VVT SYSTEM
Check and repair the VVT system.
Refer to DTC P001100 Procedure for intake camshaft.
Refer to DTC P001400 Procedure for exhaust camshaft.
| Result | ||
|---|---|---|
|
GO TO STEP 21
REPLACE EGR VALVE ASSEMBLY
Replace the EGR valve assembly.
| Result | ||
|---|---|---|
|
GO TO STEP 21
REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
Replace the air cleaner filter element sub-assembly.
| Result | ||
|---|---|---|
|
GO TO STEP 21
REPAIR OR REPLACE INTAKE SYSTEM
Repair or replace the intake system.
| Result | ||
|---|---|---|
|
GO TO STEP 21
REPAIR OR REPLACE PCV HOSE
Repair or replace the PCV valve or hose.
| Result | ||
|---|---|---|
|
CLEAR DTC
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs.
Turn the power switch off and wait for at least 30 seconds.
| Result | ||
|---|---|---|
|
CHECK WHETHER DTC OUTPUT RECURS (DTC P050B00)
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
| Tester Display |
|---|
| Coolant Temperature |
Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).
| Tester Display |
|---|
| Inspection Mode |
Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
| Tester Display |
|---|
| All Readiness |
Input the DTC: P050B00.
Check the DTC judgment result.
| Result | ||||||
|---|---|---|---|---|---|---|
|
END
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)
Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.
Repair any problems.
| Result | ||
|---|---|---|
|
CLEAR DTC
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs.
Turn the power switch off and wait for at least 30 seconds.
| Result | ||
|---|---|---|
|
CHECK WHETHER DTC OUTPUT RECURS (DTC P050B00)
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
| Tester Display |
|---|
| Coolant Temperature |
Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).
| Tester Display |
|---|
| Inspection Mode |
Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
| Tester Display |
|---|
| All Readiness |
Input the DTC: P050B00.
Check the DTC judgment result.
| Result | ||||||
|---|---|---|---|---|---|---|
|
END
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
Disconnect the mass air flow meter sub-assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
REPLACE MASS AIR FLOW METER SUB-ASSEMBLY
Replace the mass air flow meter sub-assembly.
If the result of the inspection performed in step 13 (READ VALUE USING GTS (MASS AIR FLOW SENSOR)) indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
| Result | ||
|---|---|---|
|
CLEAR DTC
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs.
Turn the power switch off and wait for at least 30 seconds.
| Result | ||
|---|---|---|
|
CHECK WHETHER DTC OUTPUT RECURS (DTC P050B00)
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
| Tester Display |
|---|
| Coolant Temperature |
Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).
| Tester Display |
|---|
| Inspection Mode |
Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
| Tester Display |
|---|
| All Readiness |
Input the DTC: P050B00.
Check the DTC judgment result.
| Result | ||||||
|---|---|---|---|---|---|---|
|
END
REPLACE ECMClick here