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NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE [JA5AX-EL]

id050305802200

17 | Excessive shift shock from N to D or N to R position/range
DESCRIPTION | • Strong shock felt when shifting from N to D or N to R position/range at idle.
POSSIBLE CAUSE | • Shift shock may worsen when fail-safe is operating. If no DTC is output, shift shock may worsen due to poor operation of control valve body or sticking of clutch. - Clutch burned (N→D: Low clutch, N→R: Reverse clutch or low and reverse brake) • Line pressure low • Incorrect throttle position signal • Malfunction of TFT sensor • Malfunction of sensor ground • Misadjustment of throttle cable • Malfunction of control valve body - Poor hydraulic operation (Malfunction in range change) - Idle speed high - Poor tightening torque of engine mount, exhaust mount - Line pressure high 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 | • Does shift shock occur only when engine cold? | Yes | Go to next step.
No | Go to Step 3.
2 | • Inspect TFT sensor and related harness: vibration, intermittent open/short circuit. • Is it okay? | Yes | Go to next step.
No | Repair or replace part if necessary.
3 | • Is line pressure okay? (See Line Pressure Test.) | Yes | Go to next step.
No | Repair or replace any defective parts according to inspection results.
4 | • Is stall speed okay? (See Stall Speed Test.) | Yes | Go to next step.
No | Go to Step 6.
5 | • Inspect TR switch and related harness: vibration, intermittent open/short circuit. • Is it okay? | Yes | Go to next step.
No | Repair or replace part if necessary.
6 | • Stop engine and turn ignition switch on. • Inspect pressure control solenoid circuit. • Is it okay? | Yes | • Overhaul control valve body and repair or replace any defective parts. (See ATX Workshop Manual.) • If problem remains, replace or overhaul transaxle and repair or replace any defective parts. (See ATX Workshop Manual.)
No | • Inspect for pressure control solenoid mechanical stuck. (See SOLENOID VALVE INSPECTION [JA5AX-EL].)
7 | • 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 repaired, troubleshooting completed. • If vehicle not repaired or additional diagnostic information not available, replace TCM.