NO.10 LOW IDLE/STALLS DURING DECELERATION [L5]SM2444473
NO.10 LOW IDLE/STALLS DURING DECELERATION [L5]

id0103a8801600

10

LOW IDLE/STALLS DURING DECELERATION
DESCRIPTION
• Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
POSSIBLE CAUSE
• ECT sensor malfunction
• Improper operation of A/C magnetic clutch
• Vacuum leakage
• Air leakage from intake air system
• PCM DTC is stored
• Improper operation of electronic throttle control system
• Improper operation of evaporative emission control system
• APP sensor malfunction
• Brake switch malfunction
• TP sensor malfunction
• MAF sensor malfunction
• VSS malfunction
• A/C switch malfunction
• Refrigerant pressure sensor malfunction
• Evaporator temperature sensor malfunction
• FAN switch malfunction
• Communication error between climate control unit and instrument cluster
• Communication error between instrument cluster and PCM
• TR switch malfunction
• Communication error between TCM and PCM

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 [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 [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
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
4
Perform the PCM DTC inspection using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [L5].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [L5].)
No
Go to the next step.
5
Perform the Electronic Throttle Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
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.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
7
Access the following PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [L5].)
• APP1
• APP2
• BOO
• TP_REL
• MAF
• VSS
Are the PID values normal?
(See PCM INSPECTION [L5].)
Yes
Go to the next step.
No
APP1, APP2 PIDs are not specified:
• Inspect the APP sensor. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [L5].)
BOO PID is not specified:
• Inspect the brake switch. (See BRAKE SWITCH INSPECTION.)
TP_REL PID is not specified:
• Inspect the TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L5].)
MAF PID is not specified:
• Inspect the MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [L5].)
VSS PID is not specified:
• Inspect the VSS. (See VEHICLE SPEED SENSOR (VSS) INSPECTION [FS5A-EL].)
Repair or replace the malfunctioning part according to the inspection results.
8
Access the AC_REQ and TR PIDs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [L5].)
Are the PID values normal?
(See PCM INSPECTION [L5].)
Yes
Go to the next step.
No
AC_REQ PID is not specified:
• Inspect the A/C switch, refrigerant pressure sensor, evaporator temperature sensor and fan switch. (See REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].) (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
• Inspect communication error between climate control unit and instrument cluster.
• Inspect communication error between instrument cluster and PCM.
TR PID is not specified:
• Inspect the TR switch. (See TRANSAXLE RANGE (TR) SWITCH INSPECTION [FS5A-EL].)
• Inspect communication error between TCM and PCM.
Repair or replace the malfunctioning part according to the inspection results.
9
Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [L5].)
• If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
― If the vehicle is repaired, troubleshooting is completed.
― If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.