Inspection Procedure 13
INSPECTION PROCEDURE 13: Poor accelerationCOMMENT
- If acceleration is poor when downshifting occurs while driving, a malfunction of the engine system or a brake or clutch may exist.
TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Malfunction of the engine system
- Malfunction of the clutch system and brake system
- Malfunction of the PCM
DIAGNOSIS
STEP 1. Check the engine system.
Q: Is the inspection result good?
YES: Go to Step 2.
NO: Repair or replace the engine component(s).
STEP 2. Check each brake and clutch. Perform the torque converter stall test. Then check for the symptom.
Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Go to Step 3.
STEP 3. Perform the hydraulic pressure test.
Perform the hydraulic pressure test. Then check for the symptom.
Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Go to Step 4.
STEP 4. Check each brake system and clutch system.
1. Remove the valve body cover and valve body.
2. Blow compressed air into the each brake oil orifice and clutch oil orifice of the transmission case, and check if the each brake and clutch piston move and air pressure is maintained.
Q: Is the air pressure maintained?
YES: Diagnosis is complete.
NO: Go to Step 5.
STEP 5. Check each brake system and clutch system.
1. Remove the transmission.
2. Check the facings for seizure and piston seal ring for damage and interference with retainer. Repair or replace the faulty parts. Then check for the symptom.
Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Go to Step 6.
STEP 6. Replace the PCM.
Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Start over at Step 1.