Code No.C1361: Abnormal pressure sensor characteristics

caution

If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Diagnose the CAN bus lines before the diagnosis codes (Refer to GROUP 54C, CAN bus-line diagnostic flow

OPERATION

ASTC-ECU monitors the fluid pressure in the hydraulic unit using the incorporated pressure sensor, and adjusts the fluid pressure for the ASC or ATC drive based on this data.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set in the following cases:

The output value of the pressure sensor does not change at the vehicle speed of 7 km/h or more.
When the vehicle drives at the speed of 40 km/h or more, the amount of the change of the pressure sensor output values during the time from the brake pedal depression to the vehicle stop is less than the specified value.
The output value of the pressure sensor is abnormal.

PROBABLE CAUSES

The most likely causes for these diagnosis codes to set are:

Damaged wiring harness or connector
Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)

DIAGNOSIS

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

caution

Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.

(1)Connect M.U.T.-III to the 16-pin diagnosis 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.

Q. Is the check result?

Go to Step 3.

Repair the CAN bus line (Refer to GROUP 54C, CAN bus line Diagnostic flow

). Then go to Step 2.

STEP 2. Check whether the diagnosis code is reset.

caution

Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.

(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.C1361 set?

Go to Step 3.

The procedure is complete.

STEP 3. Check whether the diagnosis code is reset.

Check again if the diagnosis code is set.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.C1361 set?

Replace the hydraulic unit assembly (integrated with ASTC-ECU). Then go to Step 4.

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction

STEP 4. Check whether the diagnosis code is reset.

Q. Is code No.C1361 set?

Go to Step 1.

The procedure is complete.