NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE (GENERAL (L.H.D.) SPECS. SPORT AT) [FN4A-EL]


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.
POSSIBLE CAUSE	• Shift shock may worsen when the fail-safe is operating. If no DTC is output, the shift shock may worsen due to poor operation of the control valve body or sticking of the clutch. 1. Clutch burned (N→D: Forward clutch, N→R: Reverse clutch or low and reverse brake) • Line pressure low, high • TP sensor malfunction • Accelerator pedal position sensor malfunction or mis-adjustment • Vehicle speed sensor malfunction • Input/turbine speed sensor malfunction • Shift solenoid B malfunction • Shift solenoid D malfunction • Shift solenoid A malfunction • Shift solenoid C malfunction • Pressure control solenoid malfunction • Control valve body malfunction • Sensor GND malfunction • Body GND malfunction 2. Poor hydraulic operation (Malfunction in range change) • Forward accumulator malfunction • Servo apply accumulator malfunction • Pressure switch malfunction 3. Idle speed high 4. Poor tightening torque of engine mount, exhaust mount 5. Poor operation of mechanical pressure • Selector lever position disparity Note • Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See BASIC INSPECTION (GENERAL (L.H.D.) SPECS. SPORT AT) [FN4A-EL].)


STEP	INSPECTION		ACTION
1	Does shift shock occur only when engine cold?	Yes	Go to next step.
1	Does shift shock occur only when engine cold?	No	Go to Step 3.
2	Disconnect TCM. Is resistance between ground terminal 1P or 1O at TCM connector and body ground less than 5.0 ohms?	Yes	Check the value at the following. PCM PIDs (using WDS or equivalent): • APP1 • APP2 • TP_REL Terminal voltage: • TCM terminal 2M (TFT sensor) (See TCM INSPECTION (GENERAL (L.H.D.) SPECS. SPORT AT) [FN4A-EL].) Repair or replace any defective parts.
2		No	Repair harness. Reconnect TCM.
3	Perform stall test. Is stall speed okay?	Yes	Go to next step.
3	Perform stall test. Is stall speed okay?	No	Go to Step 5.
4	Inspect following terminal voltage. • TCM terminal 2H (TR switch) (See TCM INSPECTION (GENERAL (L.H.D.) SPECS. SPORT AT) [FN4A-EL].) Is voltage okay?	Yes	Overhaul control valve body and repair or replace any defective parts. (See ATX Workshop Manual (FN4A-EL).) If problem remains, overhaul transaxle and repair or replace any defective parts. (See ATX Workshop Manual (FN4A-EL).)
4		No	Repair or replace any defective parts.
5	Check the value at the following PCM PIDs using the WDS or equivalent. • APP1 • APP2 • TP_REL Are PIDs values okay?	Yes	Go to next step.
5		No	Repair or replace any defective parts.
6	Disconnect TCM. Is resistance between ground terminal 1P or 1O at TCM connector and body ground less than 5.0 ohms?	Yes	Go to next step.
6		No	Repair harness. Reconnect TCM.
7	Inspect pressure control solenoid circuit. Is it okay?	Yes	Overhaul control valve body and repair or replace any defective parts. (See ATX Workshop Manual (FN4A-EL).) If problem remains, overhaul transaxle and repair or replace any defective parts. (See ATX Workshop Manual (FN4A-EL).)
7	Inspect pressure control solenoid circuit. Is it okay?	No	Repair or replace any defective parts.
8	• Verify test results. - If okay, return to diagnostic index to service any additional symptoms. - If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. • If vehicle repaired, troubleshooting completed. • If vehicle not repaired or additional diagnostic information not available, replace TCM.