Before replacing the ECU, ensure
that the power supply circuit, the earth circuit and the communication circuit are normal.
When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition
key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine
cannot be started. Register the encrypted code as described in Immobilizer System - How
to Register Key ID .)
DIAGNOSTIC FUNCTION
If a trouble occurs in rear height sensor, code No. B2516 is stored.
JUDGEMENT CRITERIA
The ETACS-ECU detects the error of the signal voltage from the rear height sensor (less
than 0.7 V, or 4.2 V or more) or 1 second or longer continuously.
PROBABLE CAUSES
Malfunction of the rear height sensor
Malfunction of the rear height sensor installation
Malfunction of the ETACS-ECU
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Check if diagnosis code No. B2514 is set.
Q.
Is diagnosis code No. B2514 set?
Perform the troubleshooting of the diagnosis code No. B2514.
Go to Step 2.
STEP 2. Rear height sensor installation status check
Check that the rear height sensor is installed properly.
Q.
Is the check result normal?
Go to Step 3.
Install the rear height sensor properly.
STEP 3. Voltage measurement at rear height sensor connector (SBR terminal).
(1)Disconnect the connector, and measure at the wiring harness-side connector.
(2)Turn the ignition switch to the ON position.
(3)Measure the resistance between the rear height sensor connector (SBR terminal)
and body earth. OK: 5 V
Q.
Is the check result normal?
Go to Step 5.
Go to Step 4.
STEP 4. Check of open circuit in SBR line between rear height sensor
connector and ETACS-ECU connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the rear height sensor connector (SGR terminal)
and body earth. OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 7.
Go to Step 6.
STEP 6. Check of open circuit in SGR line between rear height sensor
connector and ETACS-ECU connector.
Q.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
STEP 7. Check of short to power supply, short to earth, and open circuit
in SHR line between rear height sensor connector and ETACS-ECU connector.
Q.
Is the check result normal?
Go to Step 8.
Repair the connector(s) or wiring harness.
STEP 8. rear height sensor check
Check that the rear height sensor is normal (Refer to ).
Q.
Is the check result normal?
Go to Step 9.
Replace the rear height sensor.
STEP 9 M.U.T.-III data list
Check the rear height sensor for the signal voltage.
Item No.
Item name
Normal condition
Item 412
Rear HS signal voltage
0.7 V - 4.1 V
OK: Normal condition is displayed.
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 Malfunctions ).
Perform the troubleshooting of the diagnosis code No. B2514.
Go to Step 2.
).