Description
ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.
DTC DETECTION LOGIC
NOTE: If DTC P050A, P050B or P050E is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC No. | Trouble diagnosis name | DTC detecting condition | Possible cause |
P050A | Cold start idle air control system performance | ECM does not control engine idle speed properly when engine is started with prewarming up condition. |
|
P050B | Cold start ignition timing performance | ECM does not control ignition timing properly when engine is started with prewarming up condition. | |
P050E | Cold start engine exhaust temperature too low | The temperature of the catalyst inlet does not rise to the proper temperature when the engine is started with prewarming up condition. |
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDUREI
With CONSULT
With GST
Follow the procedure "With CONSULT" above.
Is the value of "COOLAN TEMP/S" between 15C (59F) and 36C (97F)?
YES >> GO TO 3.
NO1 [If it is below 15C (59F)]>>Warm up the engine until the value of "COOLAN TEMP/S" reaches 15C (59F) or more. Retry from step 1.
NO2 [If it is above 36C (97F)]>>Cool engine down to less than 36C (97F). Retry from step 1.
3.PERFORM DTC CONFIRMATION PROCEDUREII
With CONSULT
With GST
Follow the procedure "With CONSULT" above.
Is 1st trip DTC detected?
YES >> Go to EC, "Diagnosis Procedure".
NO >> INSPECTION END
1.PERFORM IDLE AIR VOLUME LEARNING
Perform EC, "Work Procedure".
Is Idle Air Volume Learning carried out successfully?
YES >> GO TO 2.
NO >> Follow the instruction of Idle Air Volume Learning.
2.CHECK INTAKE SYSTEM
Check for the cause of intake air volume lacking. Refer to the following.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace malfunctioning part
3.CHECK FUEL INJECTION SYSTEM FUNCTION
Perform DTC Confirmation Procedure for DTC P0171. Refer to EC, "DTC Logic".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Go to EC, "Diagnosis Procedure" for DTC P0171.
4.PERFORM DTC CONFIRMATION PROCEDURE
See EC, "DTC Logic".
Is the 1st trip DTC P050A, P050B or P050E displayed again?
YES >> GO TO 5.
NO >> INSPECTION END
5.REPLACE ECM
Replace ECM. Refer to EC, "Removal and Installation".
>> INSPECTION END
Description The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let into the intake manifold, by operating the electric throttle control ac ...
Compression pressure
Inspection
Warm up engine and then turn it off.
Release fuel pressure.
Remove ignition coil and spark plug from each cylinder.
Connect engine tachometer (not required in use of CONSULT).
Install compression gauge (B) with an adapter (A) (commercial
service tool) onto spark plug hole.
...
Fuel pressure check
Work Procedure
FUEL PRESSURE RELEASE
1.FUEL PRESSURE RELEASE
With CONSULT
Turn ignition switch ON.
Perform "FUEL PRESSURE RELEASE" in "WORK SUPPORT" mode with CONSULT.
Start engine.
After engine stalls, crank it two or three times to release all fuel
pressure.
Turn ignition switc ...