Inspection Procedure 3: The Tight Corner Braking Phenomenon* Appears With The Drive Mode Selector In The Fwd Or AWD Position: Diagnosis
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
- STEP 1. Check for the tight corner braking phenomenon occurrence during driving on a flat road
Check if the tight corner braking phenomenon occurs during driving on a flat road with the drive mode selector being on the FWD or AWD position.
Q: Does the tight corner braking phenomenon occur?
YES: Go to Step 2.
NO: Go to Step 5.
- STEP 2. Wiring harness check NOTE: Prior to the wiring harness inspection, check the following connectors for improper engagement, terminal damage or terminal drawn in the connector case.
- C-128 AWD-ECU connector
- D-113 Joint connector
Check the wiring harness between the C-128 AWD-ECU connector (terminal No.1) and the D-119 electronic control coupling solenoid connector (terminal No. 1) for damage or other problem.
Q: Is the wiring harness in good condition?
YES: Go to Step 3.
NO: Repair damage or other problem in the wiring harness. Then go to Step 7.
- STEP 3. Scan tool MB991958 data list
Check the service data for the items below (refer to INSPECTION PROCEDURE 4: NO DTC IS SET EVEN WHEN THE AWD/LOCK INDICATOR LAMPS FLASH ).
- Item 16: FL wheel speed sensor
- Item 17: FR wheel speed sensor
- Item 18: RL wheel speed sensor
- Item 19: RR wheel speed sensor
- Item 26: Throttle position
Q: Does the service data meet the standard value range?
YES: Go to Step 5.
NO: Perform the troubleshooting of the ABS system, refer to DIAGNOSTIC TROUBLE CODE CHART . For troubleshooting of the engine control system, refer to DIAGNOSTIC TROUBLE CODE CHART for 2.4L engines or DIAGNOSTIC TROUBLE CODE CHART for 30.L engines. Then go to Step 4.
- STEP 4. Check for the tight corner braking phenomenon occurrence during driving on a flat road
Check if the tight corner braking phenomenon occurs during driving on a flat road with the drive mode selector being on the FWD position.
Q: Does the tight corner braking phenomenon occur?
YES (Coil current is 0 A): Measure the coil current when the tight corner braking occurs. If the coil current measures 0 A, replace the electronic control coupling (Refer to CHECK OF ELECTRONIC CONTROL COUPLING ). Then go to Step 5.
YES (Coil current is other than 0 A): Measure the coil current when the tight corner braking occurs. If the coil current is other than 0 A, go to Step 5.
NO: Go to Step 6.
- STEP 5. Retest the system.
Q: Does the malfunction occur again?
YES: Replace AWD-ECU (refer to REMOVAL AND INSTALLATION ). Then go to Step 6.
NO: The trouble can be an intermittent malfunction (refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
- STEP 6. Retest the system.
Q: Does the malfunction occur again?
YES: Replace the electronic control coupling (refer to CHECK OF ELECTRONIC CONTROL COUPLING ). Then go to Step 7.
NO: This diagnosis is complete.
- STEP 7. Check whether the DTC is reset.
Q: Does the malfunction occur again?
YES: Diagnose again from Step 1.
NO: This diagnosis is complete.