P050B

4GR-FSE 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 -10 to 50°C (14 to 122°F) of the engine coolant temperature. The DTC will set after the engine idling for 13 seconds (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 ETCS (Electrical Throttle Control System) controls the idle speed. The ETCS 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 ISC (Idle Speed Control) learned values are cleared. ISC learning is performed when the engine has been warmed up and idled for 5 minutes because this DTC cannot be set after the ISC learned values cleared.





MONITOR DESCRIPTION





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

- Turn the engine switch on (IG) and turn the Techstream on.

- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.

- Turn the engine switch off and wait for 30 seconds.

- Turn the engine switch on (IG) and turn the Techstream on [A].

- Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.

- Check that "Coolant Temp" in the Data List is within the range of -10 to 50°C (14 to 122°F).

- Start the engine and warm it up until the 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 / Pending.

- Read the pending DTC [C].

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: P050B.

- Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- 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 [B].
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Check the DTC judgment result.

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- 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 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 Freeze Frame Data.
PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B)

(a) Connect Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the tester on.

(d) Select the following the menu items: 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 Diagnostic Trouble Code Descriptions
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 Techstream to the DLC3.

(b) Start the engine.

(c) Turn the tester on.

(d) Select the following menu items: Powertrain / Engine / Data List / Short FT #1 and Long FT #1.

(e) Read the values displayed on the tester at engine idles.

(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%.

OK -- CHECK THROTTLE VALVE
NG -- Continue to next step.

3. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV)

(a) Connect Techstream to the DLC3.

(b) Start the engine and turn the tester on.

(c) Warm up the engine.

(d) Select the following menu items: Powertrain / Engine / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2).

(e) Check the engine speed while operating the Oil Control Valve (OCV) using the tester.

OK:





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

4. CHECK PCV HOSE CONNECTIONS

OK:

PCV hose is connected correctly and is not damaged.

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

5. CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leakage.

OK:

No leakage from intake system.

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

6. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

(a) Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil.

OK:

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.

7. REPLACE MASS AIR FLOW METER

(a) Replace mass air flow meter Removal.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)

8. CHECK AND REPAIR VVT SENSOR

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)

9. REPAIR OR REPLACE PCV HOSE

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)

10. REPAIR OR REPLACE INTAKE SYSTEM

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)

11. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)

12. 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 BODY ASSEMBLY
OK -- Continue to next step.

13. REPLACE ECM

(a) Replace ECM Removal.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)

14. REPAIR OR REPLACE THROTTLE BODY ASSEMBLY

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)

15. 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 Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs DTC Check / Clear.

(e) Turn the engine switch off and wait for 30 seconds.

(f) Turn the engine switch on (IG) and turn the Techstream on.

(g) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

(h) Enter the following menus: Powertrain / Engine / Utility / All Readiness.

(i) Input the DTC: P050B

(j) Check the DTC judgment result.

OK:

DTC judgment result is NORMAL.

NEXT -- END