Inspection Procedure 11

INSPECTION PROCEDURE 11: Does not Shift Properly 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)





STEP 1. Using scan tool MB991502, check actuator test item 14: INVECS-II Cancel Command.

CAUTION: To prevent damage to scan tool MB991 502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Start the engine.
3. Set scan tool MB991502 to actuator test mode for item 14: INVECS-II Cancel Command.
^ The gear shifting correspond to the standard shift line of the shift pattern diagram.
4. Turn the ignition switch to "LOCK" (OFF) position.
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 INVECS-II 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 A/T fluid is -29°C (84°F) or less (early), or 125°C (257°F) or more (late)?
YES: The symptom is due to characteristics of the INVECS-II system, but is not abnormal.
NO: Go to Step 3.





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.
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.
Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Start over at Step 1.