P050A
2UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050A: Cold Start Idle Air Control System Performance
P050A - Cold Start Idle Air Control System Performance
DESCRIPTION
This monitor will run when the engine is started with the engine coolant temperature at -10 to 60°C (14 to 140°F). The DTC will 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 with the engine coolant temperature at lower than 60°C (140°F), the ECM (PCM) measures the accumulated mass air flow at engine idling. If it does not reach the criteria within 10 seconds, the ECM (PCM) 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 (Electronic 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 inspections or repairs, the ISC (Idle Speed Control) learning values are cleared. This DTC cannot be set with the ISC learning values cleared.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
INSPECTION PROCEDURE
HINT
When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.
PROCEDURE
1. CHECK DTC
OK:
Any other DTCs are not set.
NG -- GO TO DIAGNOSTIC TROUBLE CODE CHART SFI System
OK -- 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 power switch on (IG) and turn the Techstream ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Data List / A/F Control System / Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2.
(d) Read the values displayed on the Techstream.
(e) 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 -- CHECK VVT SYSTEM
OK -- Continue to next step.
3. CHECK THROTTLE BODY
(a) Check for deposits around the throttle valve and throttle valve condition.
OK:
No deposits around throttle valve and throttle valve moves smoothly.
OK -- REPLACE ECM
NG -- REPAIR OR REPLACE THROTTLE BODY
4. CHECK VVT SYSTEM
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG) and turn the Techstream ON.
(c) Put the engine in inspection mode Inspection Mode Procedure.
(d) Warm up the engine.
(e) Engine is idling.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2) / All Data / VVT-iE Aim Angle #1 and VVT Change Angle #1 or VVT-iE Aim Angle #2 and VVT Change Angle #2.
(g) Perform the Active Test operation with the engine speed at 1500 rpm.
OK:
NG -- CHECK AND REPAIR VVT SYSTEM
OK -- Continue to next step.
5. CHECK PCV SYSTEM
(a) Allow the engine to idle.
(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 HOSE
OK -- Continue to next step.
6. CHECK AIR CLEANER FILTER
(a) Visually check that the air cleaner filter is not excessively contaminated with dirt or oil.
NG -- REPLACE AIR CLEANER FILTER
OK -- Continue to next step.
7. CHECK AIR INDUCTION SYSTEM
(a) Check the air induction system for vacuum leakage Testing and Inspection.
OK -- REPLACE MASS AIR FLOW METER
NG -- REPAIR OR REPLACE AIR INDUCTION SYSTEM
8. REPAIR OR REPLACE THROTTLE BODY
(a) Repair or replace the throttle body Removal.
NEXT -- CHECK DTCS
9. REPLACE ECM
(a) Replace the ECM Removal.
NEXT -- CHECK DTCS
10. CHECK AND REPAIR VVT SYSTEM
NEXT -- CHECK DTCS
11. REPAIR OR REPLACE PCV HOSE
NEXT -- CHECK DTCS
12. REPLACE AIR CLEANER FILTER
NEXT -- CHECK DTCS
13. REPAIR OR REPLACE AIR INDUCTION SYSTEM
NEXT -- CHECK DTCS
14. REPLACE MASS AIR FLOW METER
(a) Replace the mass air flow meter Removal.
NEXT -- Continue to next step.
15. CHECK DTCS
(a) Check that the engine coolant temperature is -10 to 50°C (14 to 122°F).
(b) Clear the DTC DTC Check / Clear.
(c) Put the engine in inspection mode Inspection Mode Procedure.
(d) Enter the check mode using the Techstream Inspection Mode Procedure.
(e) Allow the engine to idle for 1 minute.
(f) Check that no DTC is present.
NEXT -- END