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STEP
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INSPECTION
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ACTION
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1
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Powertrain control system
• Are there any malfunctions with the following?
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- Electrical input/output
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- Vehicle wiring harness
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- PCM
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- Electrical pressure control (EPC) solenoid
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- Transaxle fluid temperature (TFT) sensor
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Yes
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Perform OBD test
Perform DTC troubleshooting
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No
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Go to the next step
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2
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Control valve body
• Do any of the following malfunctions exist?
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- Bolts are not tightened to the specification
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- Gaskets are damaged
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- 2/4 accumulator piston plug and seal (also soft 3-4 shift), main regulator valve, or line modulator valve (also soft 3-4 shift) are stuck, damaged, or misassembled
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- Hydraulic passages are damaged
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- Pressure tap plate/gasket is damaged
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- Separator plates are damaged
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Yes
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Service if necessary
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No
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Go to the next step
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3
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2/4 band and servo component
• Do any of the following malfunctions exist?
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- Piston seals or piston bore are damaged, or missing
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- Servo rod or rod bore is damaged
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- 2/4 band and/or reverse clutch drum component are worn, damaged, or misassembled
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- Springs are damaged
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- Servo cover and seal are damaged
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Yes
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Service if necessary
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No
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Go to the next step
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4
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Forward OWC component (Slips in first gear)
• Is the forward OWC component damaged or not holding?
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Yes
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Service if necessary
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No
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Go to the next step
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5
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Forward clutch component (Slip in first gear)
• Do any of the following malfunctions exist?
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- Seals are damaged
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- Return spring is damaged
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- Friction elements are damaged
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- Pump support seals #3, #4 are damaged
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Yes
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Service if necessary
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No
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Go to the next step
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6
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Low OWC component
• Is the low OWC component damaged or slipping?
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Yes
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Service if necessary
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No
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Go to the next step
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7
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Low/reverse clutch component
• Is there any severe friction damage?
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Yes
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Service if necessary
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No
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Go to the next step
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8
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Transaxle case
• Do any of the following malfunctions exist?
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- Band anchor is damaged
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- Porosity/leakage in servo apply/servo release circuits
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Yes
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Service if necessary
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No
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The malfunction is not in the automatic transaxle
Go to the engine symptom troubleshooting
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9
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• Verify the test results.
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- If normal, return to the diagnostic index to service any additional symptoms.
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- If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
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• If the vehicle is repaired, troubleshooting is completed.
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• If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.
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