Inspection Procedure 11

COMMENT
If some of the shift points are early or late when driving, the cause is probably a malfunction of the valve body, or it is due to the characteristics of the INVECS-II system,but is not an abnormality.

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Malfunction of the valve body
- Malfunction of the PCM

DIAGNOSIS





Required Special Tool: MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

STEP 1. Using Scan Tool MB991502, INVECS-II CANCEL COMMAND Item "14."
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Using scan tool MB991502, cancel INVECS-II.
4. Does the gear shifting correspond to the standard shift line of the shift pattern diagram?
If no, go to Step 2.
If yes, the symptom is due to characteristics of the INVECS-II system, but is not abnormal.

STEP 2. Are The Shift Points Early Or Late Only When A/T Fluid Is -29°C (84°F) Or Less, Or 125°C (257°F) Or More?
If no, go to Step 3.
If yes, the symptom is due to characteristics of the INVECS-II system, but is not abnormal.

STEP 3. Disassemble And Clean The Valve Body.





Check the O-ring installation bolts for looseness and the valve body for damage. Repair or replace the faulty parts. Refer to Valve Body.
If repair is not possible, replace the valve body assembly. Then check for the symptom.
If the symptom is eliminated, diagnosis is complete.
If the symptom is not eliminated, go to Step 4.

STEP 4. Replace The PCM.
Replace the PCM. The immobilizer-ECU and the ignition key should be replaced together with it. Refer to Ignition Switch and Immobilizer System - Ignition Switch and Immobilizer System. Confirm that the malfunction symptom is eliminated.
If malfunction is eliminated, diagnosis is complete.