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

id010397801600

10

LOW IDLE/STALLS DURING DECELERATION

DESCRIPTION

•  The 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

•  EVAP system malfunction

•  APP sensor or related circuit malfunction

•  APP sensor malfunction

•  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

•  PCM malfunction

10	LOW IDLE/STALLS DURING DECELERATION
DESCRIPTION	• The 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 • EVAP system malfunction • APP sensor or related circuit malfunction • APP sensor malfunction • 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 • PCM malfunction

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 [LF, L5].)
1	Does the engine idle roughly?	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 [LF, L5].)
2		No	Go to the next step.
3	Inspect 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.
3		No	Repair or replace the malfunctioning part according to the inspection results. Repeat Step 3.
4	Connect the M-MDS to the DLC-2. Switch the ignition to ON (engine off). Retrieve any DTCs. (See ON-BOARD DIAGNOSTIC TEST [LF, L5].) Are any DTCs present?	Yes	Go to the appropriate DTC inspection. (See DTC TABLE [LF, L5].)
4		No	Go to the next step.
5	Perform the Electronic Throttle Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [LF, L5].) Does the electronic throttle control system function properly?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning part according to the 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 EVAP system. Repair or replace the malfunctioning part according to the inspection results.
6		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 using the M-MDS while driving the vehicle. (See ON-BOARD DIAGNOSTIC TEST [LF, L5].) Are the PID values normal? (See PCM INSPECTION [LF, L5].)	Yes	Go to the next step.
7		No	APP1, APP2 PIDs: • Inspect the APP sensor. TP REL PID: • Inspect the TP sensor. MAF PID: • Inspect the MAF sensor. VSS PID: • Inspect the VSS. Repair or replace the malfunctioning part according to the inspection results.
8	Connect the M-MDS to the DLC-2 Access the AC_REQ and TR PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [LF, L5].) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].) Are the PID values normal? (See PCM INSPECTION [LF, L5].)	Yes	Go to the next step.
8		No	AC_REQ PID: • 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].) CPP PID is not specified: • Inspect the clutch switch (MTX). (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [LF, L5].) CPP/PNP PID is not specified: • Inspect the neutral switch (MTX). (See NEUTRAL SWITCH INSPECTION [LF, L5].) TR PID: • Inspect the following: ― TR switch (ATX) (See TRANSAXLE RANGE (TR) SWITCH INSPECTION [FS5A-EL].) ― Communication between TCM and PCM Repair or replace the malfunctioning part according to the inspection results.
9	• Verify the test results. ― If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [LF, L5].) ― If a malfunction remains, inspect the related Service Information perform repair or diagnosis. • If the vehicle repaired, troubleshooting is completed. • If the vehicle not repaired or additional diagnostic information not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [LF, L5].)