C1396

C1396 Engine Torque Intervention Refusal

CAUTION:
- If DTC C1396 is set in the ABS/TCL-ECU, always diagnose the CAN main bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set.
- Whenever the ABS/TCL-ECU is replaced, ensure that the communication circuit is normal.

DTC SET CONDITIONS
This DTC is set when the refusal of torque intervention request is sent from PCM.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
- Malfunction of the MFI system.
- Malfunction of the CAN bus line.
- Malfunction of the ABS/TCL-ECU.

DIAGNOSIS

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

STEP 1. 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 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Check for MFI system diagnostic trouble code. (Refer to MFI Diagnosis - Diagnostic Function - How to Read and Erase Diagnostic Trouble Code). Diagnostic Trouble Code Descriptions
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is any DTC set?

YES: Repair the MFI control system. (Refer to MFI Diagnosis - Diagnostic Trouble Code Chart). Then go to Step 4. Diagnostic Trouble Code Descriptions

NO: Go to Step 2.

STEP 2. Using scan tool MB991958, diagnose the CAN bus line.

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 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is any DTC set?

YES: Repair the CAN bus line. (Refer to Diagnosis - Can Bus Diagnostic Chart in Information Bus). Then go to Step 4.

NO: Go to Step 3.

STEP 3. 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 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Use scan tool MB991958 to read the TCL diagnostic trouble codes.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is DTC C1396 set?

YES: Replace the hydraulic unit (integrated with ABS/TCL-ECU). (Refer to Hydraulic Unit). Then go to Step 4.

NO: It can be assumed that this malfunction is intermittent.

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.