Inspection Procedure 5

INSPECTION PROCEDURE 5: Selector "P" Position-linked Door Unlock Function does not Operate Normally. [TC-SST]

CAUTION: Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

Selector "P" Position-linked Door Unlock Function [TO-SST]:

OPERATION
ETACS-ECU determines whether the shift position is at "P" or not according to the shift position signal which is sent by shift lever.

TECHNICAL DESCRIPTION (COMMENT)
If the doors are not unlocked when the selector lever is shifted to the P position, a malfunction of the shift position signal input circuit(s) or ETACS-ECU is suspected. Also, the selector "P" position-linked door unlock function may have been "disabled" with the customization function.

TROUBLESHOOTING HINTS
- Malfunction of shift lever
- Malfunction of ETACS-ECU
- Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE

Required Special Tools:
- MB992006: Extra fine probe
- MB991223: Harness set
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Checking central door locking system operation
Check that the central door locking system works normally.

Q: Is the check result normal?

YES: Go to Step 2.

NO: Refer to Inspection procedure 1 "Central door locking system does not work at all". Inspection Procedure 1

STEP 2. Check the customize function.
Check that either of the followings other than "Disable" is set for "Auto door unlock by P position" with the customization function.
- Always enabled

Q: Is the check result normal?

YES: Go to Step 3.

NO: Set either of the followings other than "Disable" for "Auto door unlock by P position" with the customization function.

STEP 3. Using scan tool MB991958, read CAN bus the diagnostic trouble code.

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.







1. Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)"
2. Turn the ignition switch to the "ON" position.
3. Check whether the CAN bus lines related DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES: Repair the CAN bus line (Refer to Controller area network, CAN bus diagnostics table.

NO: Go to Step 4.

STEP 4. Using scan tool MB991958, read the diagnostic trouble code.

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.







1. Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)"
2. Turn the ignition switch to the "ON" position.
3. Check whether the shift lever related DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES: Diagnose the shift lever. Refer to twin clutch-sportronic shift transmssion (TC-SST), Diagnostic trouble code chart.

NO: Go to Step 5.

STEP 5. Retest the system.
Check that shifting the selector lever to the P position unlocks the doors.

Q: Is the check result normal?

YES: No action is necessary and testing is complete.

NO: Replace the ETACS-ECU. Check that the selector lever to the P position unlocks the doors normally.