U0167
DTC U0167: Immobilizer Communication Error
CAUTION:
- If the ECM output the DTC U0167, make sure to diagnose the CAN bus line.
- Before replacing the ECU, make sure that the communication circuit is operating normally.
DTC SET CONDITIONS
Check Conditions
- Ignition switch is in "ON" position.
- Battery positive voltage is 8 volts or higher.
Judgement Criterion
- Unable to receive KOS-ECU/WCM (immobilizer-ECU) signals through the CAN bus line.
COMMENT
Current Trouble
- Some of the possible causes are a harness or connector damage between the ECM and the KOS-ECU/WCM (immobilizer-ECU) on the CAN bus line, a failure in the KOS-ECU/WCM (immobilizer-ECU) power supply system, a failure in the KOS-ECU/WCM (immobilizer-ECU), or a failure in the ECM.
Past Trouble
- Proceed to troubleshoot based on a harness or connector damage on the CAN bus line between the ECM and KOS-ECU/WCM (immobilizer-ECU), and a failure in the KOS-ECU/WCM (immobilizer-ECU) power supply system. Refer to "How to cope with past trouble" How to Treat Past Trouble ).
NOTE:
If a malfunction occurred in the past, a failure cannot be discovered through the MB991958 CAN bus diagnosis even if there might be a problem with the CAN bus. In this case, refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions How to Cope With Intermittent Malfunctions. Furthermore, it is possible to narrow down the areas of the possible failures from the DTCs that are output by the ECUs, which are communicating on the CAN bus Initial Inspection and Diagnostic Overview).
FAIL-SAFE AND BACKUP FUNCTION
- Engine start is prohibited.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- CAN line harness damage or connector damage.
- KOS-ECU/WCM (immobilizer-ECU) failed.
- ECM failed.
DIAGNOSIS
Required Special Tools:
- MB991958: Scan tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A
STEP 1. Using scan tool MB991958, diagnose 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 CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is the CAN bus line normal?
YES Go to Step 2.
NO Repair the CAN bus line. CAN Bus Diagnostics Chart.
Then go to Step 3.
STEP 2. Using scan tool MB991958, read the diagnostic trouble code
(DTC).
(1)Turn the ignition switch to the "ON" position.
(2)Read the immobilizer-DTC.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is the immobilizer-DTC set?
YES Refer to Keyless Operation System (KOS) or Wireless Control Module - Diagnosis Trouble Code Chart [Vehicles with WCM] Wireless Control Module (WCM).
NO Go to Step 3.
STEP 3. Using scan tool MB991958, read the diagnostic trouble code
(DTC).
(1)Turn the ignition switch to the "ON" position.
(2)After the MFI-DTC has been deleted, read the MFI-DTC again.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is DTC U0167 set?
YES Replace the ECM (Refer to, Removal and Installation Removal and Replacement).
NO It can be assumed that this malfunction is intermittent of CAN bus line between ECM and KOS-ECU/WCM (immobilizer-ECU). How to Cope With Intermittent Malfunctions.