NO.10 LOW IDLE/STALLS DURING DECELERATION [L8, LF, L5]

id010346801600

10

LOW IDLE/STALLS DURING DECELERATION
DESCRIPTION
•  Engine stops unexpectedly at the beginning of deceleration or recovery from deceleration.
POSSIBLE CAUSE
•  Vacuum leakage
•  Improper operation of electronic throttle control system
•  Air leakage from intake air system
•  Improper air/fuel mixture ratio control
•  Evaporative emission control system malfunction
•  APP sensor or related circuit malfunction
•  APP sensor misadjustment
•  TP sensor or related circuit malfunction
•  MAF sensor or related circuit malfunction
•  Brake switch or related circuit malfunction
•  Neutral/CPP switch or related circuit malfunction (MTX)
•  TR switch or related circuit malfunction (ATX)
•  Improper A/C magnetic clutch operation

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Does the engine idle roughly?
Yes
Go to the symptom troubleshooting "No.8 Engine runs rough/rolling idle".
(See NO.8 ENGINE RUNS ROUGH/ROLLING IDLE [L8, LF, L5].)
No
Go to the next step.
2
Turn off the A/C switch and fan switch.
Does the A/C magnetic clutch engage?
Yes
Go to the symptom troubleshooting “No.24 A/C is always on or A/C compressor runs continuously.“
(See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L8, LF, L5].)
No
Go to the next step.
3
Verify the following:
•  Proper routing of and no damage to the vacuum lines
•  No air leakage from the intake air system
Are all items normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 3.
4
Connect the M-MDS to the DLC-2.
Switch the ignition to ON (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [L8, LF, L5].)
No
No DTC is displayed:
Go to the next step.
5
Perform the electronic throttle control system operation inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L8, LF, L5].)
Does the electronic throttle control system function properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to electronic throttle control system operation inspection results.
6
Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid valve side.
Plug the open end of the vacuum hose.
Drive the vehicle.
Does the engine condition improve?
Yes
Inspect the evaporative emission control system.
No
Go to the next step.
7
Connect the M-MDS to the DLC-2.
Access the APP1, APP2, TP_REL, MAF and VSS PIDs.
Monitor each PID while driving the vehicle.
(See PCM INSPECTION [L8, LF, L5].)
Are the PIDs normal?
Yes
Go to the next step.
No
APP1, APP2 PIDs: Inspect the APP sensor.
TP_REL PID: Inspect TP sensor.
MAF PID: Inspect MAF sensor.
VSS PID: Inspect VSS.
8
Connect the M-MDS to the DLC-2
Access the ACCS, COLP, CPP/PNP and TR PIDs.
Monitor each PID.
(See PCM INSPECTION [L8, LF, L5].)
Are the PID normal?
Yes
Go to the next step.
No
ACCS PID:
Inspect the A/C switch, refrigerant pressure switch and
fan switch.
COLP PID:
Inspect the refrigerant pressure switch (middle pressure).
CPP PID:
Inspect the clutch switch (MTX).
CPP/PNP PID:
Inspect the neutral switch (MTX).
TR PID:
TR switch (ATX).
9
•  Verify test results.
―  If normal, return to the diagnostic index to service any additional symptoms.
―  If the malfunction remains, inspect the related Service Information and perform repair or diagnosis.
•  If the vehicle is repaired, troubleshooting is completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.