P050B

1AR-FE ENGINE CONTROL: SFI SYSTEM: P050B: Cold Start Ignition Timing Performance

DTC 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 the negative (-) battery terminal during inspections or repairs, the idle speed control learned values are cleared. This DTC cannot be stored with the idle speed control learned values cleared.
HINT: The idle speed control 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 procedure).
4. Turn the ignition switch off.
5. Turn the ignition switch to ON and turn the Techstream on [A].
6. Enter the following menus: Powertrain / Engine / Data List / All Data / 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 / Utility / All Readiness.
11. Input the DTC: P050B.
12. 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].

13. If the test result is UNKNOWN, enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
14. Read Pending DTCs.
HINT: If a pending DTC is output, the system is malfunctioning.

15. 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. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 / Trouble Codes.
(e) Read the DTCs.
Result:





HINT: If any DTCs other than P050B are output, troubleshoot those DTCs first.

B -- GO TO DTC CHART
A -- 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 / Data List / All Data / 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 (OPERATE OIL CONTROL VALVE)
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 BODY
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 (OPERATE OIL CONTROL VALVE)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Active Test / Control the VVT System (Bank 1).
(d) Check the engine speed while operating the camshaft timing oil control valve 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 INTAKE SYSTEM
(a) Check the intake system for vacuum leakage Intake System.
OK:
No leakage from the intake system.

NG -- REPAIR OR REPLACE INTAKE 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 BODY
(a) Repair or replace the throttle body Removal.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
11. CHECK AND REPAIR VVT SYSTEM
HINT: Refer to DTC P0011 Inspection Procedure P0011.

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 INTAKE 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 1 minute.
OK:
Stable fast idle.
(f) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
(g) Check for the pending DTCs.
OK:
No pending DTC is output.
NEXT -- REPAIR COMPLETED