NO.10 LOW IDLE/STALLS DURING DECELERATION [MZR 1.8, MZR 2.0, MZR 2.5]
id0103d4801600
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
• Erratic signal to PCM
• Improper load signal input
|
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”.
|
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.“
|
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
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.
Are any DTCs present?
|
Yes
|
Go to the applicable DTC inspection.
|
No
|
Go to the next step.
|
||
5
|
Perform the Electronic Throttle Control System Inspection.
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.
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:
• APP1
• APP2
• BOO
• TP1
• TP2
• MAF
• VSS
Do the PIDs indicate the correct values under the trouble condition?
|
Yes
|
Go to the next step.
|
No
|
APP1, APP2 PIDs are not specified:
• Inspect the APP sensor.
BOO PID is not specified:
• Inspect the brake switch.
(See BRAKE SWITCH INSPECTION.)
TP1, TP2 PIDs are not specified:
• Inspect the TP sensor.
MAF PID is not specified:
• Inspect the MAF sensor.
VSS PID is not specified:
• Inspect the VSS.
Repair or replace the malfunctioning part according to the inspection results.
|
||
8
|
Access the following PIDs using the M-MDS:
• AC_REQ
• COLP
• CPP (MTX)
• CPP/PNP (MTX)
• TR (ATX)
Are the PID values normal?
|
Yes
|
Go to the next step.
|
No
|
AC_REQ PID is not specified:
• Inspect the refrigerant pressure switch and evaporator temperature sensor fan switch.
COLP PID is not specified:
• Inspect the refrigerant pressure switch (middle pressure).
CPP PID is not specified: (MTX)
• Inspect the CPP switch.
CPP/PNP PID is not specified: (MTX)
• Inspect the neutral switch.
TR PID is not specified: (ATX)
• Inspect the TR switch.
• 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.
• If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
|