- DTC judgment completed
- System normal
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM10000000255WT |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [09/2022 - ] |
| Title: G16E-GTS (ENGINE CONTROL): SFI SYSTEM: P050B00; Cold Start Ignition Timing Performance; 2023 - 2025 MY GR Corolla [09/2022 - ] | ||
|
DTC |
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 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.
HINT:
Idle speed control learning is performed when the engine is warmed up and has been idling for 5 minutes.
|
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). |
|
Comes on |
SAE Code: P050B |
MONITOR STRATEGY
|
Related DTCs |
P050B: Cold start ignition timing performance |
|
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 |
|
Duration |
10 seconds |
|
MIL Operation |
2 driving cycles |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever the following DTCs are not stored |
P0010 (VVT oil control solenoid) P0011 (VVT system - advance) P0012 (VVT system - retard) P0013 (Exhaust VVT oil control solenoid) P0014 (Exhaust VVT system - advance) P0015 (Exhaust VVT system - retard) P0016 (VVT system - misalignment) P0017 (Exhaust VVT system - misalignment) P0087, P0088, P0191, P0192, P0193 (Fuel pressure sensor (for high pressure side)) P0101, P0102, P0103 (Mass air flow meter) P0107, P0108 (Manifold absolute pressure) P0116, P0117, P0118 (Engine coolant temperature sensor) P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor) P0125 (Insufficient coolant temperature for closed loop fuel control) P014C, P014D, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air fuel ratio sensor (sensor 1)) P0171, P0172 (Fuel system) P0201, P0202, P0203, P062D, P21CF, P21D0, P21D1 (Fuel injector) P0300 - P0303 (Misfire) P0335, P0337, P0338 (Crankshaft position sensor) P0340, P0342, P0343 (Camshaft position sensor) P0365, P0367, P0368 (Exhaust camshaft position sensor) P0500 (Vehicle speed sensor) P0657, P0658, P2102, P2103, P2111, P2112, P2119 (Throttle actuator) P107B, P107C, P107D (Fuel pressure sensor (for low pressure side)) P11EA, P11EC, P11ED, P11EE, P219A, P219C, P219D, P219E (Air-fuel ratio imbalance) P1235 (High pressure fuel pump circuit) P2228, P2229 (Atmospheric pressure sensor) |
|
Battery voltage |
8 V or higher |
|
Time after engine start |
3 seconds or more |
|
Starter |
Off |
|
Engine coolant temperature at engine start |
-10°C (14°F) or higher |
|
Engine coolant temperature |
-10°C (14°F) or higher, and less than 50°C (122°F) |
|
Engine idling time |
3 seconds or more |
|
Fuel-cut |
Off |
|
Vehicle speed |
Less than 3 km/h (1.875 mph) |
|
Atmospheric pressure |
76 kPa(abs) [11 psi(abs)] or higher |
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.
Click here
![2023 - 2025 MY GR Corolla [09/2022 - ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- 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.
- 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).
- 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
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 [B] 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 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
Refer to DTC P010012.
Click here
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
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
- Drive belt tension
- A/C compressor
- Generator assembly
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
|
1. |
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B00) |
(a) Read the DTCs.
Powertrain > Engine > Trouble Codes
|
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.
| B |
|
GO TO DTC CHART |
|
|
2. |
READ VALUE USING GTS (FUEL TRIM) |
HINT:
Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter sub-assembly.
(a) Start the engine.
(b) Read the values displayed on the GTS at engine idle.
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
Short FT B1S1 |
|
Long FT B1S1 |
(c) 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% |
| NG |
|
|
|
3. |
INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (VISUALLY CHECK THROTTLE VALVE) |
(a) 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.
| OK |
|
|
|
4. |
REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY |
Click here
HINT:
Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
Click here
| NEXT |
|
|
5. |
CHECK PCV VALVE AND HOSE CONNECTIONS |
(a) Check the PCV hose connections.
(b) Check the PCV valve.
Click here
OK:
PCV hose and PCV valve are connected correctly and are not damaged.
| NG |
|
|
|
6. |
CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks.
Click here
OK:
No leaks from intake system.
| NG |
|
|
|
7. |
CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY |
(a) 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.
| NG |
|
|
|
8. |
PERFORM ACTIVE TEST USING GTS (CHECK VVT SYSTEM) |
(a) Operate the VVT system through the Active Test, and check if the VVT system is operating normally.
(1) Perform the Active Test, referring to DTC P001100 Procedure (VVT-iE system for intake camshaft).
Click here
(2) Perform the Active Test, referring to DTC P001400 Procedure (VVT-i system for exhaust camshaft).
Click here
| NG |
|
|
|
9. |
READ VALUE USING GTS (MASS AIR FLOW SENSOR) |
(a) Start the engine.
(b) Allow the engine to idle until Coolant Temperature is 75°C (167°F) or higher.
(c) Read Mass Air Flow Sensor while maintaining an engine speed of 3000 rpm.
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
Engine Speed |
|
Mass Air Flow Sensor |
|
Coolant Temperature |
Standard:
|
GTS Display |
Condition |
Specified Condition |
|---|---|---|
|
Mass Air Flow Sensor |
Engine warmed up Shift position: P A/C: Off Engine Speed: 3000 rpm |
Between 4.5 and 12 gm/sec |
| NG |
|
|
|
10. |
CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs
(b) Turn the ignition switch off and wait for at least 30 seconds.
|
|
11. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P050B00) |
NOTICE:
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).
(a) Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
Coolant Temperature |
(b) 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.
(c) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(d) Check the DTC judgment result.
Powertrain > Engine > Utility
|
Tester Display |
|---|
|
All Readiness |
(e) Input the DTC: P050B00.
|
Result |
Proceed to |
|---|---|
|
NORMAL (DTCs are not output) |
A |
|
ABNORMAL (DTC P050B00 is output) |
B |
| A |
|
| B |
|
|
12. |
CHECK AND REPAIR VVT SYSTEM |
(a) Check and repair the VVT system.
HINT:
-
Refer to DTC P001100 Inspection Procedure (VVT-iE system for intake camshaft).
Click here
-
Refer to DTC P001400 Inspection Procedure (VVT-i system for exhaust camshaft).
Click here
| NEXT |
|
|
13. |
REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY |
(a) Replace the air cleaner filter element sub-assembly.
| NEXT |
|
|
14. |
REPAIR OR REPLACE INTAKE SYSTEM |
(a) Repair or replace the intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system.
Click here
| NEXT |
|
|
15. |
REPAIR OR REPLACE PCV VALVE OR HOSE |
(a) Repair or replace PCV valve or hose.
|
|
16. |
CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs
(b) Turn the ignition switch off and wait for at least 30 seconds.
|
|
17. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P050B00) |
NOTICE:
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).
(a) Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
Coolant Temperature |
(b) 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.
(c) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(d) Check the DTC judgment result.
Powertrain > Engine > Utility
|
Tester Display |
|---|
|
All Readiness |
(e) Input the DTC: P050B00.
|
Result |
Proceed to |
|---|---|
|
NORMAL (DTCs are not output) |
A |
|
ABNORMAL (DTC P050B00 is output) |
B |
| A |
|
END |
|
|
18. |
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) |
(a) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.
Click here
HINT:
Repair any problems.
|
|
19. |
CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs
(b) Turn the ignition switch off and wait for at least 30 seconds.
|
|
20. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P050B00) |
NOTICE:
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).
(a) Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
Coolant Temperature |
(b) 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.
(c) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(d) Check the DTC judgment result.
Powertrain > Engine > Utility
|
Tester Display |
|---|
|
All Readiness |
(e) Input the DTC: P050B00.
|
Result |
Proceed to |
|---|---|
|
NORMAL (DTCs are not output) |
A |
|
ABNORMAL (DTC P050B00 is output) |
B |
| A |
|
END |
|
|
21. |
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) |
(a) Disconnect the mass air flow meter sub-assembly connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C26-3 (VCC) - C142-84 (VCVG) |
Always |
Below 1 Ω |
|
C26-1 (FG) - C142-107 (VG) |
Always |
Below 1 Ω |
|
C26-2 (E2G) - C142-83 (E2G) |
Always |
Below 1 Ω |
|
C26-3 (VCC) or C142-84 (VCVG) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C26-1 (FG) or C142-107 (VG) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C26-2 (E2G) or C142-83 (E2G) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
22. |
REPLACE MASS AIR FLOW METER SUB-ASSEMBLY |
Click here
HINT:
- If the result of the inspection performed in step 9 (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.
Click here
|
|
23. |
CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs
(b) Turn the ignition switch off and wait for at least 30 seconds.
|
|
24. |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
NOTICE:
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).
(a) Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
Coolant Temperature |
(b) 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.
(c) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(d) Check the DTC judgment result.
Powertrain > Engine > Utility
|
Tester Display |
|---|
|
All Readiness |
(e) Input the DTC: P050B00.
|
Result |
Proceed to |
|---|---|
|
NORMAL (DTCs are not output) |
A |
|
ABNORMAL (DTC P050B00 is output) |
B |
| A |
|
END |
| B |
|
REPLACE ECM
|
|
|