Inspection Procedure 11

INSPECTION PROCEDURE 11: Some points (Early or late shift points)
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 the scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting the 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.
Q: Does the gear shifting correspond to the standard shift line of the shift pattern diagram?
YES: The symptom is due to characteristics of the INVECS11 system, but is not abnormal.
NO: Go to Step 2.

STEP 2. Check the shift points.
Q: Are the shift points early or late only when automatic transmission fluid is -29°C(84°F) or less (early), or 125°C (257°F) or more?
YES: The symptom is due to characteristics of the INVECS11 system, but is not abnormal.
NO: Go to Step 3.

STEP 3. Disassemble and clean the valve body.





1) Check the O-ring installation bolts for looseness and the valve body for damage. Repair or replace the faulty parts.
Q: Is the repair possible and the symptom eliminated?
YES: Diagnosis is complete.
NO: Replace the valve body assembly. Then check the symptom. Go to Step 4.

STEP 4. Replace the PCM.
1) Replace the PCM. The immobilizer-ECU and the ignition key should be replaced together with it. Confirm that the malfunction symptom is eliminated.
Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Start over at Step 1.