NO.10 LOW IDLE/STALLS DURING DECELERATION[LF, L3]

id0103b2801600

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
•  Accelerator pedal position sensor or related circuit malfunction
•  Accelerator pedal position sensor misadjustment
•  TP sensor misadjustment
•  TP sensor or related circuit malfunction
•  MAF sensor or related circuit malfunction
•  Brake switch or related circuit malfunction
•  Neutral/clutch pedal position 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 rough?
Yes
Go to symptom troubleshooting "No.8 Engine runs rough/rolling idle".
(See NO.8 ENGINE RUNS ROUGH/ROLLING IDLE[LF, L3].)
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 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, L3].)
No
Go to the next step.
3
Verify the following:
•  Proper routing and no damage of vacuum lines
•  IAC valve is connected properly.
•  No air leakage from 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.
Retrieve any continuous memory, KOEO and KOER DTCs using M-MDS.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE[MTX, LF ATX (FS5A-EL)].)
(See DTC TABLE[LF ATX (FN4A-EL), L3 ATX].)
No
No DTC is displayed:
Go to the next step.
5
Perform the electronic throttle control system operation inspection.
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 the purge solenoid valve side.
Plug opening end of vacuum hose.
Drive vehicle.
Does 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 following PIDs.
•  TP
•  MAF
•  VSS
•  BOO
•  CPP (MTX)
•  CPP/PNP (MTX)
•  TR (ATX)
•  APP1, APP2
Monitor each PID while driving the vehicle.
(See PCM INSPECTION[LF, L3].)
Are PIDs normal?
Yes
Intermittent concern exists.
(See INTERMITTENT CONCERN TROUBLESHOOTING[LF, L3].)
No
TP PID:
Inspect the TP sensor.
(See THROTTLE POSITION (TP) SENSOR INSPECTION[LF, L3].)
MAF PID:
Inspect the MAF sensor.
(See MASS AIR FLOW (MAF) SENSOR INSPECTION[LF, L3].)
VSS PID:
Inspect the VSS.
(See DTC TABLE[MTX, LF ATX (FS5A-EL)].)
(See DTC TABLE[LF ATX (FN4A-EL), L3 ATX].)
BOO PID:(MTX)
Inspect the brake switch.
(See BRAKE SWITCH INSPECTION[EXCEPT MZ-CD 1.6 (Y6)].)
CPP PID:(MTX)
Inspect the clutch pedal position switch.
(See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION[LF, L3].)
CPP/PNP PID:(ATX)
Inspect the neutral switch.
(See NEUTRAL SWITCH INSPECTION[LF, L3].)
APP1, APP2 PIDs:
Inspect the accelerator pedal position sensor
8
Verify test results.
•  If normal, return to diagnostic index to service any additional symptoms.
•  If malfunction remains, inspect related Service information perform repair or diagnosis.
―  If vehicle repaired, troubleshooting completed.
―  If vehicle not repaired or additional diagnostic information not available, replace the PCM.