No.10 Low Idle/Stalls During Deceleration - Mazda 2002 6 Workshop Manual

STEP
2 Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory DTCs.
Are there any DTCs displayed?
3 Connect WDS or equivalent to DLC-2.
Access ACSW, COLP, CPP, CPP/PNP, TR and
PSP PIDs.
Monitor each PID.
(See F–45 PCM
Are PIDs okay?
4 Is there air leakage felt or heard at intake-air
system components while racing engine to
higher speed?
5 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
End Of Sie

NO.10 LOW IDLE/STALLS DURING DECELERATION

10 LOW IDLE/STALLS DURING DECELERATION
• Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
DESCRIPTION
• Vacuum leakage
• IAC valve malfunction
• Air leakage from intake-air system
• Improper air/fuel mixture ratio control
• Evaporative emission control system malfunction
• TP sensor misadjustment
POSSIBLE CAUSE
• TP sensor or related circuit malfunction
• MAF sensor or related circuit malfunction
• Brake switch or related circuit malfunction
• Neutral/clutch switch or related circuit malfunction (MTX)
• TR switch or related circuit malfunction (ATX)
• Improper A/C magnetic clutch operation
Diagnostic procedure
STEP
• Does engine idle rough?
1
2 Turn off A/C switch and fan switch.
Does A/C magnetic clutch engauge?
3 Verify following:
• Proper routing and no damage of vacuum
lines
• IAC valve is connected properly.
• No air leakage from intake-air system
Are all items okay?
4 Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
Are there any DTCs displayed?
5 Does idle speed drop or stall when
disconnecting IAC valve?
F–202
TROUBLESHOOTING
INSPECTION
INSPECTION.)
INSPECTION
RESULTS
Yes DTC is displayed:
Go to appropriate DTC test.
No No DTC is displayed:
Go to next step.
Yes Go to next step.
No 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.
Yes Repair or replace parts if necessary.
No Verify accelerator cable free play.
(See F–16 ACCELERATOR CABLE INSPECTION/
ADJUSTMENT.)
RESULTS
Yes Go to symptom troubleshooting "No.8 Engine runs
rough/rolling idle".
No Go to next step.
Yes Go to symptom troubleshooting "No.24 A/C is always
on or A/C compressor runs continuously."
No Go to next step.
Yes Go to next step.
No Service as necessary.
Repeat Step 3.
Yes DTC is displayed:
Go to appropriate DTC test.
No No DTC is displayed:
Go to next step.
Yes Go to next step.
No Inspect following:
• Circuit from IAC valve to PCM connector terminal
4G or 4J for open and short
• IAC valve for sticking
If okay, go to next step.
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