NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING

id050300801900

14

Engine flares up or slips when upshifting or downshifting

DESCRIPTION

•  When accelerator pedal is depressed for driveway, engine speed increases but vehicle speed increases slowly.

•  When accelerator pedal is depressed while driving, engine speed increases but vehicle does not.

POSSIBLE CAUSE

•  There is clutch slip because clutch is stuck or line pressure is low.

1.  Clutch stuck, slippage (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 A malfunction

•  Shift solenoid B malfunction

•  Shift solenoid C malfunction

•  Pressure control solenoid malfunction

•  Body GND malfunction

•  Accelerator cable misadjustment

•  Control valve body malfunction

2.  Signal malfunction

•  Vehicle speed sensor malfunction

•  Sensor GND malfunction

•  Accelerator pedal position sensor malfunction

•  TP sensor malfunction or mis-adjustment

•  Input/turbine speed sensor malfunction

3.  Poor operation of mechanical pressure

•  Selector lever position disparity

•  TR switch position disparity

Note

•  Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Is shift point okay?	Yes	Go to next step.
1	Is shift point okay?	No	Go to No.9 “ABNORMAL SHIFTING”
2	Check the value at the following PIDs using the M-MDS. (See PCM INSPECTION [ZJ, ZY].) • APP • TP Are PID values okay?	Yes	Go to next step.
2		No	Repair or replace any defective parts.
3	Disconnect PCM. Is resistance between GND terminal at PCM connector and body GND less than 5.0 ohms?	Yes	Go to next step.
3		No	Repair open GND circuit. Reconnect PCM.
4	Check LPS PID value. Is LPS PID value okay? (See PCM INSPECTION [ZJ, ZY].)	Yes	Overhaul control valve body and repair or replace any defective parts. If problem remains, overhaul transaxle and repair or replace any defective parts.
4		No	Repair or replace any defective parts.
5	• Verify test results. ― If okay, return to diagnostic index to service any additional symptoms. ― If malfunction remains, inspect related Service informations and perform repair or diagnosis. • If vehicle not repaired, trouble shooting completed. • If vehicle not repaired or additional diagnostic information not available, replace PCM.