Inspection Procedure 11
INSPECTION PROCEDURE 11: Early or late shifting in some gearsCOMMENT
- Keep in mind that INVECS-II's optimum shift pattern features adapt to the driver's individual driving habits. If some shifting occurs early or late when driving, the cause is probably a malfunction of the valve body
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 MB991502, 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, or 125° C (257° F) or more?
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.