Code No. U1117 Immobilizer-ECU Time-out

caution

If Diagnosis Code U1117 is output from engine-ECU surely perform CAN busline diagnosis.

caution

Replace ECU after certainly confirming that the communication circuits are normal.

TROUBLE JUDGMENT

Check Condition

Ignition switch is in "ON" position.

Judgment Criterion

The signal from the immobilizer-ECU is not received for 0.5 second or more.

COMMENT ON TROUBLE SYMPTOM

Current malfunction

The failure is possibly caused by malfunction of the harness and connector in CAN busline between engine-ECU and immobilizer-ECU, by malfunction in the power supply system of immobilizer-ECU, in immobilizer-ECU itself, in engine-ECU.

Past malfunction

Focus on diagnosing malfunction of the harness and connector in CAN busline between engine-ECU and immobilizer-ECU as well as malfunction in the power supply system of immobilizer-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

caution

When the ignition key is maintained within the range "A" (i.e., the ignition switch IG2 is in OFF position but the cranking does not start) for more than 1 second, engine-ECU stores diagnosis code U1117 (the past trouble).

note

In case of Past trouble, M.U.T.-III CAN bus diagnosis cannot detect the failure even if there is malfunction in CAN bus, so that check CAN busline in the same way as Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions

). The diagnosis codes being output to each ECU with CAN communication can narrow down the most suspected area. (Refer to GROUP 54C - Explanation About The M.U.T.-III Can Bus Diagnostics

PROBABLE CAUSE

Failed of the harness and the connector
Failed engine-ECU
Failed immobilizer-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

Using M.U.T.-III, perform CAN busline diagnosis.

Q. Is the check result normal?

	Go to Step 2 .

	Correct CAN busline (Refer to GROUP 54C - Diagnosis - Can Bus Diagnostic Chart ), and then go to Step 3 .

STEP 2. M.U.T.-III other system diagnosis codes

Confirm whether the diagnosis codes are output from immobilizer-ECU.

Q. Is the diagnosis code output?

	YES : Perform the troubleshooting of immobilizer system (Refer to GROUP 54A - Immobilizer System - Check Chart for Diagnosis Code ).

	Go to Step 3 .

STEP 3. M.U.T.-III diagnosis code

Reconfirm whether the diagnosis codes are output from engine-ECU

Erase the diagnosis codes being output.
Ignition switch: "LOCK" (OFF) to ON
Confirm whether the diagnosis codes are output.

Q. Is the diagnosis code output?

	Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

	Intermittent malfunction in CAN busline between engine-ECU and immobilizer-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).