P0702

DTC P0702: Internal control module, monitoring processor system (Malfunction)

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

DIAGNOSTIC FUNCTION

TC-SST-ECU checks that the internal module and monitoring processor are normal.

DESCRIPTIONS OF MONITOR METHODS

The internal module and monitoring processor are determined to be abnormal.

PROBABLE CAUSES

- 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. CAN Bus Diagnostics Chart.) After repairing the CAN bus line, go to Step 2.
STEP 2. Check the TC-SST-ECU power supply circuit

Refer to Inspection Procedure 4.

Q. Is the check result normal?

YES Go to Step 3.
NO Repair the TC-SST-ECU power supply circuit. (Refer to Inspection Procedure 4.) After repairing the power supply circuit, go to Step 3.
STEP 3. Check whether the DTC is reset.

Q. Is DTC No. P0702 set?

YES Replace the transaxle assembly. (Refer to Removal and Replacement.)
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)