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
Trailer towing
(with towing package)
Your vehicle is designed primarily as a passenger-and-load-carrying
vehicle. Towing a trailer can have an adverse impact on
handling, performance, braking, durability, and fuel consumption.
For your safety and the safety of others, you must not overload
your vehicle or trailer. You must also e ...
Speaker Circuit
DESCRIPTION
When the vehicle has a built-in type amplifier, a sound signal is
sent from the radio receiver to the
speakers via the "6 Speaker System" circuit.
When the vehicle has a separate type amplifier, a sound signal
from the radio receiver is amplified by
...
Transmitter ID not Registered
DTC C2171/71 Transmitter ID not Registered
DESCRIPTION
The IDs of each tire pressure warning valve and transmitters are registered
to the tire pressure warning
ECU.
When the IDs have never been registered, a DTC is output.
INSPECTION PROCEDURE
NOTICE:
When replacing the tire pressu ...