P050A

2ZR-FE ENGINE CONTROL: SFI SYSTEM: P050A: Cold Start Idle Air Control System Performance

DTC 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 can be set 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 lower than 50°C (122°F), the ECM measures the accumulated mass air flow at idle. If it does not reach the specified level 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.
NOTE: When the negative battery terminal is disconnected during inspection or repairs, the idle speed control (ISC) learned values are cleared. Idle speed control learning needs to be performed before this DTC can be stored. To perform idle speed control learning, the engine must be warmed up by allowing it to idle for 5 minutes. For idle speed control learning to be successful, when the engine is started to warm it up, there must be at least 10 seconds of idling with the coolant temperature below 30°C before allowing it to continue running for the 5 minute learning period.
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





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 and ECT / 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
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 and ECT / Data List / 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 CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY)
OK -- Continue to next step.

3. INSPECT THROTTLE BODY ASSEMBLY
(a) Check that there are no deposits around the throttle valve.
OK:
No deposits around the throttle valve.
NG -- REPLACE THROTTLE BODY ASSEMBLY
OK -- Continue to next step.

4. REPLACE ECM
(a) Replace ECM Removal.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
5. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY)
(a) Check the camshaft timing oil control valve assembly for intake camshaft.
(1) Connect the Techstream to the DLC3.
(2) Start the engine.
(3) Turn the Techstream on.
(4) Turn the A/C switch to ON.
(5) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1).
(6) Check the engine speed while operating the camshaft timing oil control valve assembly (for intake camshaft) using the Techstream.
Result:





HINT: If the result is not acceptable, cool the engine and perform the Active Test again.

(7) Start the engine when the engine coolant temperature is 30°C (86°F) or less.
(8) Turn the Techstream on.
(9) Turn the A/C switch to ON.
(10) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1).
(11) Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream with the engine coolant temperature is 50°C (122°F) or less.
Result:






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

6. CHECK PCV SYSTEM
(a) Start the engine.
(b) Pinch the positive crankcase ventilation (PCV) hose.
(c) Check the engine rpm.
OK:
The engine rpm 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 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 leaks Testing and Inspection.
OK:
No leaks 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. REPLACE THROTTLE BODY ASSEMBLY
(a) Repair or replace the throttle body assembly Removal.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
11. CHECK AND REPAIR VVT SYSTEM
HINT: Check the VVT system for intake camshaft 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 -- Continue to next step.

15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
NOTE: For 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 DTCs DTC Check / Clear.
(e) Switch the ECM from normal mode to check mode using the Techstream Check Mode Procedure.
(f) Start the engine and idle it for one minute.
OK:
Stable fast idle
(g) Read the DTCs.
OK:
No DTC is output.
NEXT -- END