Inspection Procedure 5: Speed Change With the Paddle Shift Is Impossible

INSPECTION PROCEDURE 5: Speed change with the paddle shift is impossible.

PADDLE SHIFT SWITCH SYSTEM CIRCUIT
Inspection Procedure 3: Speed Change With the Paddle Shift Is Impossible.

CAUTION
Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

COMMENTS ON TROUBLE SYMPTOM
The paddle shift switch, or shift lever-ECU may have a problem.

PROBABLE CAUSES
^ Malfunction of the paddle shift switch
^ Damaged harness wires and connectors
^ Malfunction of the shift lever-ECU
^ Malfunction of TC-SST-ECU

DIAGNOSTIC PROCEDURE

Required Special Tools:
^ MB991958: Scan Tool (M.U.T.-III Sub Assembly)
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.

STEP 2. Paddle shift switch check
Paddle Shift Assembly Test
Q: Is the check result normal?
YES: Go to Step 3.
NO: Replace the paddle shift assembly. Service and Repair

STEP 3. Measure the resistance at C-207 paddle shift switch connector.
Disconnect the connector, and measure the resistance between terminal No.2 and ground at the wiring harness side.
OK: Continuity exists. (2 ohms or less)
Q: Is the check result normal?
YES: Go to Step 6.
NO: Go to Step 4.

STEP 4. Paddle shift switch connector check: C-207
Check for the contact with terminals.
Q: Is the check result normal?
YES: Go to Step 5.
NO: Repair the defective connector.

STEP 5. Check the wiring harness between C-207 paddle shift switch connector terminal No. 2 and the body ground.
Check the ground line for open circuit.
Q: Is the check result normal?
YES: Go to Step 6.
NO: Repair the wiring harness.

STEP 6. Inspection of the shift lever assembly connector, intermediate connector, and paddle shift switch connector: C-27, C-130, C-207
Check for the contact with terminals.
Q: Is the check result normal?
YES: Go to Step 7.
NO: Repair the defective connector.

STEP 7. Check the wiring harness between C-207 paddle shift switch connector terminal No. 1 and C-27 shift lever assembly connector terminal No. 11, and between C-207 paddle shift switch connector terminal No. 3 and C-27 shift lever assembly connector terminal No. 10.
Check the output line for short or open circuit.
Q: Is the check result normal?
YES: Go to Step 8.
NO: Repair the wiring harness.

STEP 8. Trouble symptom recheck after replacing the shift lever assembly
1) Replace the shift lever assembly.
2) Verify that the condition described by the customer exists.
Q: Does a malfunction take place again?
YES: Replace the mechatronic assembly.
NO: Intermittent malfunction.