DTC P050A Cold Start Idle Air Control System Performance
DESCRIPTION
This monitor will run when the engine is started at -10 to 50C (14 to 122F) 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 50C (122F) 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
INSPECTION PROCEDURE
HINT: Read freeze frame data using the intelligent tester. 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.
1 CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A)
Result
HINT: If any DTCs other than P050A are output, troubleshoot those DTCs first.
2 READ VALUE USING INTELLIGENT TESTER (FUEL TRIM)
HINT: Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter.
OK: Total of SHORT FT #1 and LONG FT #1 values is between -20 % and 20 %.
3 PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE OCV)
OK
4 CHECK PCV HOSE CONNECTIONS
OK: PCV hose is connected correctly and is not damaged.
5 CHECK INTAKE SYSTEM
OK: No leakage from intake system.
6 CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
OK: Air cleaner filter element is not excessively contaminated with dirt or oil.
7 REPLACE MASS AIR FLOW METER
8 CHECK AND REPAIR VVT SYSTEM
9 REPAIR OR REPLACE PCV HOSE
10 REPAIR OR REPLACE INTAKE SYSTEM
11 REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
12 CHECK THROTTLE VALVE
OK: No deposits around throttle valve and throttle valve moves smoothly.
13 REPLACE ECM
14 REPAIR OR REPLACE THROTTLE BODY ASSEMBLY
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).
OK: Stable fast idling.
OK: No DTC output.
END
Replacing a flat tire
Chock the tires.
Slightly loosen the wheel nuts
(one turn).
Turn the tire jack portion A by
hand until the notch of the jack
is in contact with the jack point.
The jack point guides are located
on the side of rocker moulding.
They indicate the jack point po ...
Mute Signal Circuit between Radio Receiver and Stereo Component
Amplifier
DESCRIPTION
This circuit sends a signal to the stereo component amplifier to mute noise.
Because of that, the noise
produced by changing the sound source ceases.
If there is an open in the circuit, noise can be heard from the speakers when
changing the sound source.
If there is a short i ...
Input instructions
(a) The general VIN input instructions using the
intelligent tester are shown below:
(b) The arrow buttons (UP, DOWN, RIGHT and LEFT)
and numerical buttons (0 to 9) are used to input the
VIN.
(c) Cursor Operation
To move the cursor around the tester screen, press
the RIGHT and LEFT buttons. ...