M20F-FXS, M20G-FXS ENGINE CONTROL SFI SYSTEM P050B00 Cold Start Ignition Timing Performance
MONITOR DESCRIPTION
A monitor will run when the engine is started at an engine coolant temperature of -10 (14°F) or higher, and less than 50°C (122°F). If certain conditions are met, a DTC is stored after the engine idles for 13 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.
- NOTICE:
-
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 | Note |
|---|---|---|---|---|---|
| P050B00 | Cold Start Ignition Timing Performance | Ignition timing insufficiently retarded at cold start (2 trip detection logic). | ·
Throttle body with motor assembly ·
Mass air flow meter ·
PCV system ·
Air cleaner filter element sub-assembly ·
Intake system ·
VVT system ·
EGR valve assembly ·
Wire harness or connector ·
ECM |
Comes on | SAE Code: P050B |
MONITOR STRATEGY
| Required Sensors/Components (Main) | Throttle body with motor assembly |
| Required Sensors/Components (Related) | Engine coolant temperature sensor
Mass air flow meter |
| 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
- HINT:
- ·
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
·When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).
Start the engine and warm it up for 5 minutes or more.
Stop the engine.
Leave the vehicle outside overnight.
Turn the ignition switch to ON [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 (Maintenance Mode).
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 [C].
Read the pending DTC.
- HINT:
- ·
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 | ·
DTC judgment completed ·
System normal |
| ABNORMAL | ·
DTC judgment completed ·
System abnormal |
| INCOMPLETE | ·
DTC judgment not completed ·
Perform driving pattern after confirming DTC enabling conditions |
- HINT:
- ·
If the judgment result is NORMAL, the system is normal.
·If the judgment result is ABNORMAL, the system is malfunctioning.
·If the judgment result is INCOMPLETE, idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] through [C] again.
·Idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] through [C]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
·When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
- ·
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 assembly 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 assembly, 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.
- HINT:
- ·
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
Read the DTCs.
- Powertrain > Engine > Trouble Codes
- 50001 372
- Result:
Result Proceed to DTC P050B00 is output A DTC P050B00 and other DTCs are output B
- HINT:
-
If any DTCs other than P050B00 are output, troubleshoot those DTCs first.
A
B
- HINT:
-
Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter.
Put the engine in Inspection Mode (Maintenance Mode).
- Powertrain > Hybrid Control > Utility
-
Tester Display Inspection Mode - 50005 397 2103
Start the engine.
Enter the following menus.
- Powertrain > Engine > Data List
-
Tester Display Short FT B1S1 Long FT B1S1 - 50003 372 207,209
Read the values displayed on the GTS at engine idle.
Add the Short FT B1S1 and Long FT B1S1 values to obtain the total fuel trim.
- Standard:
GTS Display Specified Condition Total of Short FT B1S1 and Long FT B1S1 Between -20 and 20%
- Result:
Proceed to OK NG
OK
NG
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:
Proceed to OK NG
OK
NG
Put the engine in Inspection Mode (Maintenance Mode).
- Powertrain > Hybrid Control > Utility
-
Tester Display Inspection Mode - 50005 397 2103
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.
- HINT:
-
The A/C switch and all accessories should be off.
Enter the following menus.
- Powertrain > Engine > Active Test
-
Active Test Display Control the EGR Step Position -
Data List Display Intake Manifold Absolute Pressure Coolant Temperature Engine Independent - 50004 372 25 385,205,428
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.
- NOTICE:
- ·
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:
- Control the EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Intake Manifold Absolute Pressure
(Data List)(EGR valve is fully closed) Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed
- HINT:
- ·
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:
Proceed to OK NG
OK
NG
Remove the EGR valve assembly.
Check if the EGR valve is stuck open.
- OK:
EGR valve is tightly closed.
- Result:
Proceed to OK NG
OK
NG
- HINT:
-
Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
- Result:
Proceed to NEXT
NEXT
Check the PCV hose connections.
- OK:
PCV hose and PCV valve are connected correctly and are not damaged.
- Result:
Proceed to OK NG
OK
NG
Check the intake system for vacuum leaks.
- OK:
No leaks from intake system.
- Result:
Proceed to OK NG
OK
NG
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:
Proceed to OK NG
OK
NG
Put the engine in Inspection Mode (Maintenance Mode).
- Powertrain > Hybrid Control > Utility
-
Tester Display Inspection Mode - 50005 397 2103
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.
- HINT:
-
The A/C switch and all accessories should be off.
Enter the following menus.
- Powertrain > Engine > Active Test
-
Active Test Display Control the EGR Step Position -
Data List Display Intake Manifold Absolute Pressure Coolant Temperature Engine Independent - 50004 372 25 385,205,428
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.
- NOTICE:
- ·
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:
- Control the EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Intake Manifold Absolute Pressure
(Data List)(EGR valve is fully closed) Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed
- HINT:
- ·
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:
Proceed to OK NG
OK
NG
Remove the EGR valve assembly.
Check if the EGR valve is stuck open.
- OK:
EGR valve is tightly closed.
- Result:
Proceed to OK NG
OK
NG
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-iE system for intake camshaft).
Perform the Active Test, referring to DTC P001400 Procedure (VVT-i system for exhaust camshaft).
- Result:
Proceed to OK NG
OK
NG
Put the engine in Inspection Mode (Maintenance Mode).
- Powertrain > Hybrid Control > Utility
-
Tester Display Inspection Mode - 50005 397 2103
Start the engine.
Turn the GTS on.
Enter the following menus.
- Powertrain > Engine > Data List
-
Tester Display Engine Speed Mass Air Flow Sensor Coolant Temperature - 50003 372 211,215,205
Allow the engine to idle until Coolant Temperature is 75°C (167°F) or higher.
Read Mass Air Flow Sensor while maintaining an engine speed of 2500 rpm.
- HINT:
-
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:
GTS Display Condition Specified Condition Mass Air Flow Sensor ·Engine warmed up
·Shift position: P
·A/C: Off
·Engine Speed: 2500 rpm
Between 5.5 and 18.6 gm/sec
- Result:
Proceed to OK NG
OK
NG
Clear the DTCs.
- Powertrain > Engine > Clear DTCs
- 50002 372
Turn the ignition switch off and wait for at least 30 seconds.
- Result:
Proceed to NEXT
NEXT
- NOTICE:
-
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).
Enter the following menus.
- Powertrain > Engine > Data List
-
Tester Display Coolant Temperature - 50003 372 205
Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (Maintenance Mode).
- Powertrain > Hybrid Control > Utility
-
Tester Display Inspection Mode - 50005 397 2103
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
-
Tester Display All Readiness - 50005 372 20
Input the DTC: P050B00.
Check the DTC judgment result.
- Result:
Result Proceed to NORMAL
(DTCs are not output)A ABNORMAL
(DTC P050B00 is output)B
A
B
Check and repair the VVT system.
- HINT:
- ·
Refer to DTC P001100 Inspection Procedure (VVT-iE system for intake camshaft).
·Refer to DTC P001400 Inspection Procedure (VVT-i system for exhaust camshaft).
- Result:
Proceed to NEXT
NEXT
- HINT:
-
Perform "Inspection After Repair" after replacing the EGR valve assembly.
- Result:
Proceed to NEXT
NEXT
Replace the air cleaner filter element sub-assembly.
- Result:
Proceed to NEXT
NEXT
Repair or replace the intake system.
- HINT:
-
Perform "Inspection After Repair" after repairing or replacing the intake system.
- Result:
Proceed to NEXT
NEXT
Repair or replace PCV valve or hose.
- Result:
Proceed to NEXT
NEXT
Clear the DTCs.
- Powertrain > Engine > Clear DTCs
- 50002 372
Turn the ignition switch off and wait for at least 30 seconds.
- Result:
Proceed to NEXT
NEXT
- NOTICE:
-
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).
Enter the following menus.
- Powertrain > Engine > Data List
-
Tester Display Coolant Temperature - 50003 372 205
Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (Maintenance Mode).
- Powertrain > Hybrid Control > Utility
-
Tester Display Inspection Mode - 50005 397 2103
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
-
Tester Display All Readiness - 50005 372 20
Input the DTC: P050B00.
Check the DTC judgment result.
- Result:
Result Proceed to NORMAL
(DTCs are not output)A ABNORMAL
(DTC P050B00 is output)B
A
B
Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM.
- HINT:
-
Repair any problems.
- Result:
Proceed to NEXT
NEXT
Clear the DTCs.
- Powertrain > Engine > Clear DTCs
- 50002 372
Turn the ignition switch off and wait for at least 30 seconds.
- Result:
Proceed to NEXT
NEXT
- NOTICE:
-
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).
Enter the following menus.
- Powertrain > Engine > Data List
-
Tester Display Coolant Temperature - 50003 372 205
Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (Maintenance Mode).
- Powertrain > Hybrid Control > Utility
-
Tester Display Inspection Mode - 50005 397 2103
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
-
Tester Display All Readiness - 50005 372 20
Input the DTC: P050B00.
Check the DTC judgment result.
- Result:
Result Proceed to NORMAL
(DTCs are not output)A ABNORMAL
(DTC P050B00 is output)B
A
B
Disconnect the mass air flow meter connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C26-4 (VCC) - C141-78 (VCVG) Always Below 1 Ω C26-3 (FG) - C141-101 (VG) Always Below 1 Ω C26-2 (E2G) - C141-79 (E2G) Always Below 1 Ω C26-4 (VCC) or C141-78 (VCVG) - Body ground and other terminals Always 10 kΩ or higher C26-3 (FG) or C141-101 (VG) - Body ground and other terminals Always 10 kΩ or higher C26-2 (E2G) or C141-79 (E2G) - Body ground and other terminals Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG
- HINT:
- ·
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.
·Perform "Inspection After Repair" after replacing the mass air flow meter.
- Result:
Proceed to NEXT
NEXT
Clear the DTCs.
- Powertrain > Engine > Clear DTCs
- 50002 372
Turn the ignition switch off and wait for at least 30 seconds.
- Result:
Proceed to NEXT
NEXT
- NOTICE:
-
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).
Enter the following menus.
- Powertrain > Engine > Data List
-
Tester Display Coolant Temperature - 50003 372 205
Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (Maintenance Mode).
- Powertrain > Hybrid Control > Utility
-
Tester Display Inspection Mode - 50005 397 2103
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
-
Tester Display All Readiness - 50005 372 20
Input the DTC: P050B00.
Check the DTC judgment result.
- Result:
Result Proceed to NORMAL
(DTCs are not output)A ABNORMAL
(DTC P050B00 is output)B
A
B