P050B
1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050B: Cold Start Ignition Timing Performance
P050B - Cold Start Ignition Timing Performance
DESCRIPTION
This monitor will run when the engine is started at an engine coolant temperature of -10 to 50°C (14 to 122°F). The DTC will set after the engine idles for 13 seconds (2 trip detection logic).
The DTC is designed to monitor the ignition timing at cold start. When the engine is started at an engine coolant temperature of lower than 50°C (122°F), the ECM checks the ignition timing at engine idling. If the ignition timing advances beyond the specified level within 10 seconds, the ECM interprets this as a malfunction. The MIL is illuminated and a DTC is set when the malfunction is detected in consecutive driving cycles (2 trip detection logic).
NOTICE:
When the negative battery terminal is disconnected during inspections or repairs, the ISC (Idle Speed Control) learning values are cleared. This DTC cannot be set with the ISC learning values cleared.
HINT
The ISC learning is performed when the engine is warmed up and has been idling for 5 minutes.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON and turn the Techstream on [A].
6. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
7. Check that "Coolant Temp" in the Data List are within the range of -10 to 50°C (14 to 122°F).
8. Start the engine and warm it up until the coolant temperature is the same as the coolant temperature in the freeze frame data.
9. Idle the engine for 1 minute or more [B].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
11. Read the pending DTCs.
HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13. Input the DTC: P050B.
14. Check the DTC judgment result.
HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.
* If the judgment result shows INCOMPLETE or UNKNOWN, idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] through [C] again.
15. If no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.
INSPECTION PROCEDURE
HINT
* DTC P050B may be set when the engine has the symptoms listed below. If necessary, check the trouble areas listed below.
* Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.
PROCEDURE
1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read the DTCs.
Result
HINT
If any DTCs other than P050B are output, troubleshoot those DTCs first.
NG -- GO TO DTC CHART SFI System
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (FUEL TRIM) P050A
NG -- CHECK PCV SYSTEM
OK -- Continue to next step.
3. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY P050A
NG -- REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
OK -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
4. REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY P050A
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
5. CHECK PCV SYSTEM P050A
NG -- REPAIR OR REPLACE PCV HOSE
OK -- Continue to next step.
6. CHECK INTAKE SYSTEM P0101
NG -- REPAIR OR REPLACE INTAKE SYSTEM
OK -- Continue to next step.
7. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY P050A
NG -- REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
OK -- Continue to next step.
8. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV) P050A
NG -- CHECK AND REPAIR VVT SYSTEM
OK -- Continue to next step.
9. READ VALUE USING TECHSTREAM (MAF) P0171
NG -- CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER CONNECTOR CONNECTION)
OK -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
10. REPAIR OR REPLACE PCV HOSE P050A
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
11. REPAIR OR REPLACE INTAKE SYSTEM P050A
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
12. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY P050A
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
13. CHECK AND REPAIR VVT SYSTEM P050A
NEXT -- Continue to next step.
14. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
NOTICE:
For this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data).
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON and turn the Techstream on.
(g) Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
(h) Check that the engine coolant temperature is between -10°C and 50°C (14 and 122°F).
(i) Start the engine and warm it up.
(j) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(k) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
(l) Input the DTC: P050B.
(m) Check the DTC judgment result.
Result
B -- CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER CONNECTOR CONNECTION)
A -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
15. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER CONNECTOR CONNECTION) P050A
NEXT -- Continue to next step.
16. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
NOTICE:
For this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data).
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON and turn the Techstream on.
(g) Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
(h) Check that the engine coolant temperature is between -10°C and 50°C (14 and 122°F).
(i) Start the engine and warm it up.
(j) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(k) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
(l) Input the DTC: P050B.
(m) Check the DTC judgment result.
Result
B -- CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
A -- END
17. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) P0300
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
18. REPLACE MASS AIR FLOW METER P050A
NEXT -- Continue to next step.
19. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
NOTICE:
In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON and turn the Techstream on.
(g) Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
(h) Check that the engine coolant temperature is between -10°C and 50°C (14 and 122°F).
(i) Start the engine and warm it up.
(j) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(k) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
(l) Input the DTC: P050B.
(m) Check the DTC judgment result.
Result
B -- REPLACE ECM Removal
A -- END