NO.21 ENGINE STALLS WHEN DRIVING AT SLOW SPEEDS OR STOPPING [DJVA-EL]

id050312248200

21

Engine stalls when driving at slow speeds or stopping
DESCRIPTION
•  Engine stalls when brake pedal is depressed while driving at low speed or stopping.
POSSIBLE CAUSE
An idle increase malfunction or insufficient engine power condition in the engine system can be considered possible causes. A torque converter clutch (TCC) system malfunction (lock-up engine stall) with the CVT is also a possible cause.
•  Idle speed control malfunction, idle increase malfunction, engine malfunction, or insufficient power
•  Torque converter clutch (TCC) system malfunction (solenoid operation circuit, oil passage clogging, or operation malfunction)
―  Output solenoid malfunction (Stuck)
•  Torque converter clutch (TCC) solenoid
•  Torque converter clutch (TCC) engage solenoid
―  Input signal malfunction
•  APP sensor
•  CKP sensor
•  Input/turbine speed sensor
•  VSS
•  Sensor GND
•  Oil cooler restriction (Foreign material mixed in CVT (continuously variable transaxle) fluid), oil cooler pipe bend
Note
•  Before following the symptom troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [DJVA-EL].) (See BASIC INSPECTION [DJVA-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Retrieve the DTC for PCM and TCM using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.5, MZR 1.6].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [DJVA-EL].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.5, MZR 1.6].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [DJVA-EL].)
No
Go to the next step.
2
Is the idle speed properly?
Yes
Go to the next step.
No
Perform the Electronic Throttle Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.5, MZR 1.6].)
3
Does the idle speed increase smoothly when the A/C or electrical load is switched on, or when the selector lever is shifted from N to D position?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
•  Electronic throttle control system malfunction
•  Malfunction in the climate control, electrical load, or N to D input signal system.
4
Access the following PCM and TCM PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.5, MZR 1.6].)
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [DJVA-EL].)
PCM PIDs
•  APP
•  RPM
TCM PIDs
•  TSS
•  VSS
Verify the monitoring value when the selector lever is shifted from the N to D position while idling.
Are all PID values normal?
(See PCM INSPECTION [MZR 1.5, MZR 1.6].)
Yes
Go to the next step.
No
Inspect for open or short suspect sensor related circuit. (Highly possibility of intermittent malfunction, therefore shake connector and wiring harness.)
Repair or replace the malfunctioning part according to the inspection results.
5
Inspect the following TCM output signal circuit:
•  Torque converter clutch (TCC) solenoid
•  Torque converter clutch (TCC) engage solenoid
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
6
Inspect the following solenoids:
(See SOLENOID VALVE INSPECTION [DJVA-EL].)
•  Torque converter clutch (TCC) solenoid
•  Torque converter clutch (TCC) engage solenoid
Is there any malfunction?
Yes
Replace the CVT.
(See CVT (CONTINUOUSLY VARIABLE TRANSAXLE) REMOVAL/INSTALLATION [DJVA-EL].)
No
Go to the next step.
7
Is there any excessive bending in the oil cooler pipe?
Yes
Replace the oil cooler pipe.
(See OIL COOLER REMOVAL/INSTALLATION [DJVA-EL].)
No
Go to the next step.
8
Blow the oil cooler outlet with compressed air.
Is there any foreign material?
Yes
Clean or replace the oil cooler.
(See OIL COOLER REMOVAL/INSTALLATION [DJVA-EL].)
No
One of the following malfunctions may have occurred:
•  Improper operation of torque converter clutch (TCC)
•  Control valve body
Replace the CVT.
(See CVT (CONTINUOUSLY VARIABLE TRANSAXLE) REMOVAL/INSTALLATION [DJVA-EL].)
9
•  Verify the 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 repair or diagnosis.
•  If the vehicle is repaired, the symptom troubleshooting is completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM. (See TCM REMOVAL/INSTALLATION [DJVA-EL].)