NO.10 LOW IDLE/STALLS DURING DECELERATION [MZR 1.6]

id0103f9801600

10

LOW IDLE/STALLS DURING DECELERATION
DESCRIPTION
•  The engine stops unexpectedly at the beginning of deceleration or recovery from deceleration.
POSSIBLE CAUSE
•  Improper operation of A/C magnetic clutch
•  Vacuum leakage
•  Air leakage from intake-air system
•  Continuous memory DTC is stored
•  Improper operation of drive-by-wire control system
•  EVAP control system malfunction
•  APP sensor or related wiring harness malfunction
•  TP sensor or related wiring harness malfunction
•  MAF sensor or related wiring harness malfunction
•  Brake switch or related wiring harness malfunction
•  CPP switch or related wiring harness malfunction (MTX)
•  Neutral switch or related wiring harness malfunction (MTX)
•  TR switch or related wiring harness malfunction (ATX)
•  PCM malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
Does the engine idle rough?
Yes
Go to the symptom troubleshooting “NO.8 ENGINE RUNS ROUGH/ROLLING IDLE”.
(See NO.8 ENGINE RUNS ROUGH/ROLLING IDLE [MZR 1.6].)
No
Go to the next step.
2
Note
•  Following test is for engine running rough idle with the A/C on concerns. If other symptoms exist, go to the next step.
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 [MZR 1.6].)
No
Go to the next step.
3
Inspect the following:
•  Proper routing and no damage of vacuum lines
•  No air leakage from intake-air system
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
Repeat Step 3.
No
Go to the next step.
4
Connect M-MDS to the DLC-2.
Perform the KOEO or KOER self test.
(See KOEO/KOER SELF TEST [MZR 1.6].)
Are any continuous memory DTCs present?
Yes
Go to the appropriate DTC inspection.
(See DTC TABLE [MZR 1.6].)
No
Go to the next step.
5
Perform the Drive-by-wire Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.6].)
Does the throttle body operate properly?
Yes
Go to the next step.
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 the purge solenoid valve side.
Plug the opening end of vacuum hose.
Drive the vehicle.
Does the engine condition improve?
Yes
Inspect the EVAP 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:
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].)
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [PCM (FN4A-EL)].)
•  APP
•  TP1, TP2, TP REL
•  MAF
•  BOO
•  CPP
•  CPP/PNP
•  TR
Monitor the each PID while driving the vehicle.
Are all PIDs normal?
(See PCM INSPECTION [MZR 1.6].)
Yes
Intermittent concern exists.
•  Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
No
APP:
•  Inspect the APP sensor and related wiring harness.
TP1, TP2, TP REL:
•  Inspect the TP sensor and related wiring harness.
MAF:
•  Inspect the MAF sensor and related wiring harness.
BOO:
•  Inspect the brake switch and related wiring harness.
CPP:
•  Inspect the CPP switch and related wiring harness (MTX).
CPP/PNP:
•  Inspect the neutral switch and related wiring harness (MTX).
TR:
•  Inspect the TR switch and related wiring harness (ATX).
Repair or replace the malfunctioning part according to the inspection results.
8
Verify the test results.
•  If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZR 1.6].)
•  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. (See PCM REMOVAL/INSTALLATION [MZR 1.6].)