Inspection Procedure 3
Inspection Procedure 3: When the Shift Lever is Moved to "N" Position, Cruise Control is not Cancelled [TC-SST.]
CIRCUIT OPERATION
When the shift lever is in the "N" position, the "N" position signal is transmitted from the shift lever ECU to the ECM via CAN bus line.
COMMENT
- Malfunction of CAN bus line.
- Malfunction of shift lever system.
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)
- Malfunction of CAN bus system.
- Damaged harness or connector.
- Malfunction of the shift lever system.
- Malfunction of the TC-SST-system.
- Malfunction of the ECM.
DIAGNOSTIC PROCEDURE
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
CAUTION:
If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code (DTC) may be set. Prior to this diagnosis, diagnose the CAN bus lines Initial Inspection and Diagnostic Overview.)
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
(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 (Refer to Reading and Clearing Diagnostic Trouble Codes.)
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line (Refer to Scan Tool Testing and Procedures.)
Q. Is the check result satisfactory?
YES Go to Step 2
NO Repair the CAN bus lines CAN Bus Diagnostics Chart.) Then go to Step 6.
STEP 2. Using scan tool MB991958, read the shift lever system DTC.
(1)Connect scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes.)
(2)Turn the ignition switch to the "ON" position.
(3)Check for shift lever system DTC Reading and Clearing Diagnostic Trouble Codes.)
Q. Is any DTC set?
YES Repair the shift lever system Shift Lever.) Then go to Step 6.
NO Go to Step 3.
STEP 3. Using scan tool MB991958, read the TC-SST system DTC.
(1)Connect scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes.)
(2)Turn the ignition switch to the "ON" position.
(3)Check for shift lever system DTC Reading and Clearing Diagnostic Trouble Codes.)
Q. Is any DTC set?
YES Repair the TC-SST system Twin Clutch-Sportronic Shift Transmission (TC-SST).) Then go to Step 6.
NO Go to Step 4.
STEP 4. Using scan tool MB991958, check data list item 88: Neutral switch.
(1)Connect scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes.)
(2)Turn the ignition switch to the "ON" position.
(3)Set scan tool MB991958 to data reading mode for cruise control system (Refer to Scan Tool Testing and Procedures.)
- Item 88: Neutral switch.
- When shift lever is at the "N" or "P" position, the display on scan tool MB991958 should be "ON".
- When shift lever is other than "N" or "P" position, the display on scan tool MB991958 should be "OFF".
Q. Is the switch operating properly?
YES Go to Step 5.
NO Replace the ECM [ Removal and Replacement.] Then go to Step 6.
STEP 5. Check the symptom.
Q. When the shift lever is moved to "N" position, is the cruise control cancelled?
YES It can be assumed that this malfunction is intermittent How to Cope With Intermittent Malfunctions.)
NO Replace the ECM [ Removal and Replacement.] Then go to Step 6.
STEP 6. Check the symptom.
Q. When the shift lever is moved to "N" position, is the cruise control cancelled?
YES The procedure is complete.
NO Return to Step 1.