Inspection Procedure 11

INSPECTION PROCEDURE 11: Early or Late Shifting in Some Gears

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 CONDITION:)

- Malfunction of the valve body
- Malfunction of the PCM

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, check special function: INVECS-II Cancel Command.





(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958 to the data link connector.
(2)Start the engine.
(3)Set scan tool MB991958 to the actuator test mode.

- Special function: INVECS-II Cancel Command.
- Drive the vehicle and confirm the gear shifting correspond to the standard shift line of the shift pattern diagram. Refer to General Information .
(4)Turn the ignition switch to the "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 transmission 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. Valve Body Disassembly and Assembly Valve Body Valve Body Disassembly and Assembly.
Replace the valve body assembly if the damages are thought to be irreparable. Then check the symptom.

Q. Is the symptom eliminated?

YES The procedure is complete.

NO Go to Step 4.

STEP 4. Replace the PCM.

When the PCM is replaced, register the encrypted code. Immobilizer System.

Q. Is the symptom eliminated?

YES The procedure is complete.
NO Start over at Step 1.