NO.10 LOW IDLE/STALLS DURING DECELERATION [L8, LF, L3]
id0103a1801600
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10 |
LOW IDLE/STALLS DURING DECELERATION |
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DESCRIPTION
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• Engine stops unexpectedly at the beginning of deceleration or recovery from deceleration.
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POSSIBLE CAUSE
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• 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 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
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Diagnostic procedure
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STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Does the engine idle roughly?
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Yes
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Go to symptom troubleshooting "No.8 Engine runs rough/rolling idle".
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No
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Go to the next step.
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2
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Turn off the A/C switch and fan switch.
Does the A/C magnetic clutch engage?
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Yes
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Go to symptom troubleshooting “No.24 A/C is always on or A/C compressor runs continuously.“
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No
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Go to the next step.
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3
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Verify the following:
• Proper routing of and no damage to vacuum lines
• No air leakage from intake-air system
Are all items normal?
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Yes
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Go to the next step.
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No
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Service if necessary.
Repeat Step 3.
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4
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Connect the WDS or equivalent to the DLC-2.
Turn the ignition switch to the ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
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Yes
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DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [L8, LF, L3].)
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No
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No DTC is displayed:
Go to the next step.
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5
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Perform the electronic throttle control system operation inspection.
Does the electronic throttle control system function properly?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to electronic throttle control system operation inspection results.
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6
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Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid valve side.
Plug opening end of vacuum hose.
Drive the vehicle.
Does the engine condition improve?
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Yes
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Inspect the evaporative emission control system.
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No
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Go to the next step.
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7
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Connect the WDS or equivalent to the DLC-2.
Access APP1, APP2, TP, MAF and VSS PIDs.
Monitor each PID while driving vehicle.
(See PCM INSPECTION [L8, LF, L3].)
Are PIDs normal?
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Yes
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Go to the next step.
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No
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APP1, APP2 PIDs: Inspect the accelerator pedal position sensor.
TP PID: Inspect TP sensor.
MAF PID: Inspect MAF sensor.
VSS PID: Inspect VSS.
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8
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Connect the WDS or equivalent to DLC-2
Access ACSW, COLP, CPP/PNP, TR and PSP PIDs.
Monitor each PID.
(See PCM INSPECTION [L8, LF, L3].)
Are PIDs value okay?
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Yes
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Go to the next step.
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No
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ACSW PID:
Inspect A/C switch, refrigerant pressure switch and
fan switch.
COLP PID:
Inspect refrigerant pressure switch (middle pressure).
CPP PID:
Inspect clutch switch (MTX).
CPP/PNP PID:
Inspect neutral switch (MTX).
TR PID:
TR switch (ATX).
PSP PID:
Inspect P/S pressure switch.
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9
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• Verify test results.
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