NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE [FS5A-EL]
id050308802200
17 |
Excessive shift shock from N to D or N to R position/range |
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DESCRIPTION
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• Strong shock is felt when shifting from N to D or N to R position/range at idle.
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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 burnt (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 the shift shock occur only when the engine is cold?
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Yes
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Go to the 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 the TCM connector.
Is the resistance between the ground terminal at the TCM connector and the body ground less than 5.0 ohms?
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Yes
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Inspect the value at the following PCM and TCM PIDs using the M-MDS.
PCM PIDs:
• APP
• RPM
TCM PIDs:
• THOP
• TFT
• TFTV
Repair or replace any malfunctioning parts according to the inspection result.
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No
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Repair or replace the wiring harness for a possible open circuit.
Reconnect the TCM connector.
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3
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Perform the stall test.
Is the stall speed normal?
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Yes
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Go to the next step.
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No
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Go to Step 5.
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4
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Inspect the value at the following TCM PID using the M-MDS.
• TR
Is the PID value normal?
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Yes
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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.)
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No
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Repair or replace any malfunctioning parts according to the inspection result.
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5
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Inspect the value at the following TCM PID using the M-MDS.
• THOP
Is the PID value normal?
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Yes
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Go to the next step.
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No
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Repair or replace any malfunctioning parts according to the inspection result.
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6
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Disconnect the TCM connector.
Is the resistance between the ground terminal at the TCM connector and the body ground less than 5.0 ohms?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for a possible open circuit.
Reconnect the TCM connector.
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7
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Inspect the value at the following TCM PID using the M-MDS.
• LPS
Is the PID value normal?
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Yes
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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.)
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No
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Repair or replace any malfunctioning parts according to the inspection result.
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8
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• Verify the test results.
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