NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE
id050300802200
17
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Excessive shift shock from N to D or N to R position/range
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DESCRIPTION
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• Strong shock felt when shifting from N to D or N to R position/range.
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POSSIBLE CAUSE
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• 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)
2. Poor hydraulic operation (Malfunction in range change)
3. Idle speed high
4. Poor tightening torque of engine mount, exhaust mount
5. Poor operation of mechanical pressure
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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---|---|---|---|
1
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Does shift shock occur only when engine cold?
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Yes
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Go to next step.
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No
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Go to Step 3.
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2
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Disconnect PCM.
Is resistance between GND terminal at PCM connector and body GND less than 5.0 ohms?
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Yes
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Check the value at the following PIDs using the M-MDS.
(See PCM INSPECTION [ZJ, ZY].)
• APP
• TP
• TFT
• TFTV
Repair or replace any defective parts.
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No
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Repair open GND circuit. Reconnect PCM.
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||
3
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Perform the stall test.
(See MECHANICAL SYSTEM TEST.)
Is stall speed okay?
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Yes
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Go to next step.
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No
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Go to Step 5.
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4
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Check TR PID value.
Is PID value okay?
(See PCM INSPECTION [ZJ, ZY].)
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Yes
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Overhaul control valve body and repair or replace any defective parts.
If problem remains, overhaul transaxle and repair or replace any defective parts.
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No
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Repair or replace any defective parts.
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||
5
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Check the value at the following PIDs using the M-MDS.
(See PCM INSPECTION [ZJ, ZY].)
• APP
• TP
Are PID values okay?
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Yes
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Go to next step.
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No
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Repair or replace any defective parts.
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6
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Disconnect PCM.
Is resistance between GND terminal at PCM connector and body GND less than 5.0 ohms?
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Yes
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Go to next step.
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No
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Repair open GND circuit. Reconnect PCM.
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7
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Check LPS PID value.
Is LPS PID value okay?
(See PCM INSPECTION [ZJ, ZY].)
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Yes
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Overhaul control valve body and repair or replace any defective parts.
If problem remains, overhaul transaxle and repair or replace any defective parts.
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No
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Repair or replace any defective parts.
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8
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• Verify test results.
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