P050A
2AR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050A: Cold Start Idle Air Control System Performance
P050A - Cold Start Idle Air Control System Performance
MONITOR 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 idle air control at cold start. When the engine is started at an engine coolant temperature of below 50°C (122°F), the ECM measures the accumulated mass air flow during engine idling. If the accumulated mass air flow does not reach 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).
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 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) Reading and Clearing Diagnostic Trouble Codes.
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 / 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: P050A.
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 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
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 P050A)
(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 P050A are output, troubleshoot those DTCs first.
B -- GO TO DTC CHART SFI System
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 / 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 (OPERATE OCV)
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 P050A)
5. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV)
(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).
(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.
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. 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:
The 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.
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 P050A)
10. REPAIR OR REPLACE THROTTLE BODY
(a) Repair or replace the throttle body Removal.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
11. CHECK AND REPAIR VVT SYSTEM
HINT
Refer to DTC P0011 Inspection Procedure P0011.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
12. REPAIR OR REPLACE PCV SYSTEM
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
13. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
14. REPAIR OR REPLACE INTAKE SYSTEM
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
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 to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the ignition switch off and wait for at least 30 seconds.
(f) Turn the ignition switch to ON and turn the Techstream on.
(g) Start the engine and warm it up.
(h) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Utility / All Readiness.
(j) Input the DTC: P050A
(k) Check the DTC judgment result.
OK:
DTC judgment result is NORMAL.
NEXT -- END