P050B

2GR-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 -10 to 50°C (14 to 122°F) of the engine coolant temperature. The DTC will set after the engine idling for 13 seconds or more (2 trip detection logic).
The DTC is designed to monitor the idle air control at cold start. When the engine is started at lower than 50°C (122°F) of the engine coolant temperature, the ECM measures the accumulated mass air flow at the engine idling. If it does not reach the criteria 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).
The electronic throttle control system controls the idle speed. The electronic throttle control system operates the throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle speed.
NOTICE: When the negative (-) battery terminal is disconnected during inspection or repairs, the idle speed control learned values are cleared. Idle speed control learning is performed when the engine has been warmed up and idled for 5 minutes because this DTC cannot be set after the idle speed control learned values are cleared.





MONITOR DESCRIPTION





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 [A].
3. Clear the DTCs (even if no DTCs are stored, perform the Clear DTC procedure) DTC Check / Clear.
4. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.
5. Check that "Coolant Temp" in the Data List is within the range of -10 to 50°C (14 to 122°F).
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 / 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 / Trouble Codes / 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 set when the engine shows the symptom as listed below. If necessary, check the trouble area as 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 be helpful in determining whether the vehicle was running or stopped, 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 P050B)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following the 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 sub-assembly.
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Active Test / Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2.
(e) Read the values displayed on the Techstream at engine idle.
(f) Add together the Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values to obtain the total fuel trim.
OK:
Total of Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values is between -20 % and 20 %.

NG -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT SYSTEM BANK 1 OR BANK 2)
OK -- Continue to next step.

3. CHECK THROTTLE VALVE
(a) Check for deposits around the throttle valve and throttle valve condition.
OK:
No deposits around throttle valve and throttle valve moves smoothly.

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. REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
(a) Repair or replace the throttle with motor body assembly Removal.
NEXT -- Continue to next step.

6. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
NOTICE: In 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 ON and turn the Techstream on (Step A).
(c) Clear the DTCs (even if no DTCs are stored, perform the Clear DTC procedure) DTC Check / Clear.
(d) Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
(e) Check that "Coolant Temp" in the Data List are within the range of -10 to 50°C (14 to 122°F).
(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.
(g) Idle the engine for 1 minute ore more (Step B).
(h) Enter the following menus: Powertrain / Engine / Utility / All Readiness.
(i) Input the DTC: P050B.
(j) Check the DTC MONITOR is NORMAL (Step C).
(k) If DTC MONITOR is INCOMPLETE or UNKNOWN, let the engine cool down, and then perform steps A through C.





OK:
DTC MONITOR is NORMAL.
NEXT -- END
7. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT SYSTEM BANK 1 OR BANK 2)
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Warm up the engine.
(e) Enter the following menus: Powertrain / Engine / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2).
(f) Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream.
OK:






NG -- CHECK AND REPAIR VVT SYSTEM
OK -- Continue to next step.

8. CHECK PCV HOSE (HOSE CONNECTIONS)
(a) Check the PCV hose connections Testing and Inspection.
OK:
PCV hose is connected correctly and is not damaged.

NG -- REPAIR OR REPLACE PCV HOSE
OK -- Continue to next step.

9. CHECK INTAKE SYSTEM
(a) Check the intake system for vacuum leaks Testing and Inspection.
OK:
No leaks in intake system.

NG -- REPAIR OR REPLACE INTAKE SYSTEM
OK -- Continue to next step.

10. 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:
Air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.

NG -- REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
OK -- Continue to next step.

11. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY
(a) Replace the mass air flow meter sub-assembly Removal.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
12. CHECK AND REPAIR VVT SYSTEM
(a) Check and repair the VVT system.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
13. REPAIR OR REPLACE PCV HOSE
(a) Repair or replace the PCV hose.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
14. REPAIR OR REPLACE INTAKE SYSTEM
(a) Repair or replace the intake system.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
15. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
(a) Replace the air cleaner filter element sub-assembly.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
16. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
NOTICE: In 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 ON and turn the Techstream on (Step A).
(c) Clear the DTCs (even if no DTCs are stored, perform the Clear DTC procedure) DTC Check / Clear.
(d) Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
(e) Check that "Coolant Temp" in the Data List are within the range of -10 to 50°C (14 to 122°F).
(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.
(g) Idle the engine for 1 minute ore more (Step B).
(h) Enter the following menus: Powertrain / Engine / Utility / All Readiness.
(i) Input the DTC: P050B.
(j) Check the DTC MONITOR is NORMAL (Step C).
(k) If DTC MONITOR is INCOMPLETE or UNKNOWN, let the engine cool down, and then perform steps A through C.





OK:
DTC MONITOR is NORMAL.
NEXT -- END