P050B
2AR-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 is stored 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 below 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. The MIL is illuminated and a DTC is stored when the malfunction is detected in consecutive driving cycles (2 trip detection logic).
NOTICE:
When the cable is disconnected from negative (-) battery terminal during inspections or repairs, the ISC (Idle Speed Control) learned values are cleared. This DTC cannot be stored with the ISC learned 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 DTCs (even if no DTCs are stored, perform the clear DTC operation) [A].
4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
5. Check that "Coolant Temp" in the Data List is within the range of -10 to 50°C.
6. Start the engine and warm it up until the coolant temperature is the same as the coolant temperature in the freeze frame data.
7. Idle the engine for 1 minute or more [B].
8. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
9. Input the DTC: P050B.
10. Check the DTC judgment result [C].
HINT
- 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].
11. If the test result is UNKNOWN, enter the following menus: Powertrain / Engine and ECT / Trouble Code / Pending.
12. Read Pending DTCs.
HINT
If a pending DTC is output, the system is malfunctioning.
13. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.
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 output 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 Engine Control System - SFI System
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (FUEL TRIM)
HINT
Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter.
(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 / Data List / A/F Control System / Short FT #1 and Long FT #1.
(e) Read the values displayed on the Techstream.
(f) Add together the Short FT #1 and Long FT #1 values to obtain the total Fuel Trim
OK:
Total of Short FT #1 and Long FT #1 values is between -20% and 20%.
NG -- PERFORM ACTIVE TEST USING TECHSTREAM (OCV OPERATION)
OK -- Continue to next step.
3. INSPECT THROTTLE BODY
(a) Check that there are no deposits around the throttle valve.
OK:
No deposits around the throttle valve.
NG -- REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
OK -- Continue to next step.
4. REPLACE ECM
(a) Replace the ECM Removal.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
5. PERFORM ACTIVE TEST USING TECHSTREAM (OCV OPERATION)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) Warm up the engine.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1).
(e) Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.
OK:
NG -- CHECK AND REPAIR VVT SYSTEM
OK -- Continue to next step.
6. CHECK PCV SYSTEM
(a) Start the engine.
(b) Pinch the PCV hose.
(c) Check the engine speed.
OK:
The engine speed rises when the PCV hose is pinched.
NG -- REPAIR OR REPLACE PCV SYSTEM
OK -- Continue to next step.
7. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
(a) Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil.
OK:
The air cleaner filter element is not excessively contaminated with dirt or oil.
NG -- REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
OK -- Continue to next step.
8. CHECK AIR INDUCTION SYSTEM
(a) Check the air induction system for vacuum leakage.
OK:
No leakage from the air induction system.
NG -- REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK -- Continue to next step.
9. REPLACE MASS AIR FLOW METER
(a) Replace the mass air flow meter Removal.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
10. REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
(a) Repair or replace the throttle with motor body assembly Removal.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
11. CHECK AND REPAIR VVT SYSTEM
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
12. REPAIR OR REPLACE PCV SYSTEM
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
13. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
14. REPAIR OR REPLACE AIR INDUCTION SYSTEM
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
NOTICE:
For this operation, the engine must be cold (the same temperature 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 the DTCs DTC Check / Clear.
(e) Start the engine and idle it for one minute.
OK:
Stable fast idle.
(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Code / Pending.
(g) Read the pending DTCs.
OK:
No pending DTC is output.
NEXT -- END