Inspection Procedure 6: Obstacle is not Detected even when The Shift Lever is Shifted to "R" (Reverse) Position <RALLIART>.


caution
  • Whenever the ECU is replaced, ensure that the input signal circuit is normal.
  • When the illuminated licence plate is installed, the sensors may not operate because of noise from the plate. (When the ultrasonic noise is received, the bass toned buzzer sound continuously. When the ultrasonic noise stops, the normal operation will be resumed immediately.)








COMMENTS ON TROUBLE SYMPTOM
If obstacle is not detected even when the selector or shift lever is shifted to "R" (reverse) position, the wiring harness, connectors, shift lever, or clearance warning control unit may be defective. In addition, obstacle is not detected when the ultrasonic noise is received.
note If ultrasonic noise is received with the sensor, the clearance warning control unit sounds the low toned buzzer continuously and turns off the system. When the ultrasonic noise is stopped, the sensor returns to normal.

PROBABLE CAUSES

  • Damaged harness wires and connectors
  • Malfunction of the shift lever
  • Malfunction of clearance warning control unit

DIAGNOSIS PROCEDURE

STEP 1. Check the reversing sensor (forward distance warning sensor and corner clearance sensor) for interference.

Q. Are there anything that interferes with the communication (things that generate radio waves such as magnets and an air-cleaning device that has a power plug) near the reversing sensor (forward distance warning sensor and corner clearance sensor)?
Move away or remove things that interfere with the communication (things that generate radio waves such as magnets and a air-cleaning device that has a power plug) near the reversing sensor (forward distance warning sensor and corner clearance sensor).
Go to Step 2

STEP 2. M.U.T.-III other system diagnosis code
Check if the diagnosis code is set to the TC-SST.

Q. Is the diagnosis code set?
Troubleshoot the TC-SST. Refer to GROUP 22E - Troubleshooting .
Go to Step 3.

STEP 3. Connector check: C-40 clearance warning control unit connector and C-58 shift lever connector.

Q. Is the check result normal?
Go to Step 4
Repair the defective connector.

STEP 4. Voltage measurement at C-40 clearance warning control unit connector.
(1)Disconnect C-40 clearance warning control unit connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ON" position, and move the shift lever to the "R" position.
(3)Measure the voltage between terminal No. 1 and earth.
OK: System voltage

Q. Is the check result normal?
Go to Step 8
Go to Step 5

STEP 5. Check the wiring harness between C-58 shift lever connector terminal No. 3 and C-40 clearance warning control unit connector terminal No. 1.
note Before the wiring harness inspection, inspect the intermediate connector C-28, joint connectors C-30 and C-39, and ETACS-ECU connectors C-304 and C-311, and repair if necessary.

Q. Is the check result normal?
Go to Step 6
Repair the wiring harness.

STEP 6. Voltage measurement at C-58 shift lever connector.
(1)Disconnect C-58 shift lever connector, and measure at the wiring harness side.
(2)Turn the ignition switch to "ON" position.
(3)Measure the voltage between C-58 shift lever connector terminal No. 4 and earth.
OK: System voltage

Q. Is the check result normal?
Replace the shift lever.
Go to Step 7

STEP 7. Check the wiring harness between C-58 shift lever connector terminal No. 4 and fusible link 34.
note Before the wiring harness inspection, inspect the intermediate connector C-31, joint connector C-30 and ETACS-ECU connectors C-309 and C-313, and repair if necessary.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the wiring harness.

STEP 8. Retest the system
Check if an obstacle is detected when the shift lever is shifted to the "R" (Reverse) position.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the clearance warning control unit.