NO.9 ABNORMAL SHIFTING[FS5A-EL]
id050308801400
9
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Abnormal shifting
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DESCRIPTION
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• Shifts incorrectly (incorrect shift pattern).
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POSSIBLE CAUSE
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• There is a malfunction in the signal circuit which controls shifting (TP sensor, input/turbine speed sensor, vehicle speed sensor), the control valve is stuck, the accumulator (forward or servo apply) is stuck, or the clutch circuit is stuck.
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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---|---|---|---|
1
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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 open ground circuit. Reconnect the TCM.
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2
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Inspect the value at the following PCM and TCM PIDs using the M-MDS.
(See PCM INSPECTION[LF, L3].)
(See TCM INSPECTION[FS5A-EL].)
PCM PIDs:
• APP
• TP REL
TCM PIDs:
• THOP
• TSS
• OSS
• VSS
Are the PID values normal?
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Yes
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Overhaul the control valve body and repair or replace any malfunctioning parts.
(See ATX workshop manual [FS5A-EL].)
If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts.
(See ATX workshop manual [FS5A-EL].)
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No
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Repair or replace any malfunctioning parts.
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3
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• Verify the test results.
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