NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING [FS5A-EL]

id050308801900

14

Engine flares up or slips when upshifting or downshifting
DESCRIPTION
•  When accelerator pedal is depressed, engine speed increases normally but vehicle speed increases slowly.
•  When accelerator pedal is depressed while driving, engine speed increases but vehicle speed does not.
POSSIBLE CAUSE
•  There is clutch slippage because the clutch is stuck or the line pressure is low.
1.  Clutch stuck, slippage, burnt (Forward clutch, 3–4 clutch, 2–4 brake band, one-way clutch)
•  Line pressure low
•  Shift solenoid D malfunction
•  Shift solenoid E malfunction
•  Shift solenoid F malfunction
•  Shift solenoid A malfunction
•  Shift solenoid B malfunction
•  Shift solenoid C malfunction
•  Pressure control solenoid A malfunction
•  Body GND malfunction
•  Control valve body malfunction
2.  Signal malfunction
•  VSS malfunction
•  Sensor GND malfunction
•  APP sensor malfunction
•  MAF sensor malfunction
•  CKP sensor malfunction
•  Input/turbine speed sensor malfunction
3.  Poor operation of mechanical pressure
•  Selector lever position disparity
•  TR switch position disparity
Note
•  Before following the 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 [FS5A-EL].) (See BASIC INSPECTION [FS5A-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Is the shift point normal?
Yes
Go to the next step.
No
Perform the symptom troubleshooting “NO.9 ABNORMAL SHIFTING”.
(See NO.9 ABNORMAL SHIFTING [FS5A-EL].)
2
Inspect the value at the following TCM PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)
•  THOP
Is the PID value normal?
Yes
Go to the next step.
No
Inspect the value at the following PCM PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.8, MZR 2.0, MZR 2.5].)
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI].)
•  APP
Repair or replace any malfunctioning parts according to the inspection result.
(See PCM INSPECTION [MZR 1.8, MZR 2.0, MZR 2.5].)
(See PCM INSPECTION [MZR 2.0 DISI].)
3
Disconnect the TCM connector.
Is the resistance between the ground terminal at the TCM connector and the body ground less than 5.0 ohms?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit.
Reconnect the TCM connector.
4
Inspect the value at the following TCM PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)
•  LPS
Is the PID value normal?
Yes
Overhaul the control valve body and repair or replace any malfunctioning parts.
(See Automatic Transaxle Workshop Manual FS5A-EL.)
If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts.
(See Automatic Transaxle Workshop Manual FS5A-EL.)
No
Repair or replace any malfunctioning parts according to the inspection result.
5
•  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, troubleshooting is completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.