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 height sensor, code No. B2514 is stored.
JUDGEMENT CRITERIA
The ETACS-ECU detects the power supply error of the height sensor (less than 4.2 V, or
5.8 V or more) for 1 second or longer continuously.
PROBABLE CAUSES
Malfunction of the front height sensor
Malfunction of the rear height sensor
Malfunction of the ETACS-ECU
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Voltage measurement at front height sensor connector
(SBF 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 front height sensor connector (SBF terminal)
and body earth. OK: 5 V
Q.
Is the check result normal?
Go to Step 3.
Go to Step 2.
STEP 2. Check of short to power supply, short to earth circuit in
SBF line between front height sensor connector and ETACS-ECU connector.
Q.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
STEP 3. Check whether the diagnosis code is reset.
Q.
Is diagnosis code No. B2514 set?
Go to Step 4.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to cope with Intermittent Malfunctions ).
STEP 4. 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 6.
Go to Step 5.
STEP 5. Check of short to power supply, short to earth circuit in
SBR line between rear height sensor connector and ETACS-ECU connector.
Q.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
STEP 6. Check whether the diagnosis code is reset.
Q.
Is diagnosis code No. B2514 set?
Go to Step 7.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to cope with Intermittent Malfunctions ).
STEP 7. M.U.T.-III data list
Disconnect the front and rear height sensor connector, and check the power supply voltage
to the height sensor.
Item No.
Item name
Normal condition
Item 410
HS power supply voltage
5 V
OK: Normal condition is displayed.
Q.
Is the check result normal?
Go to Step 8.
Go to Step 11.
STEP 8. Front height sensor check
Check the front height sensor for the internal failure. Refer to .
Q.
Is the check result normal?
Go to Step 9.
Replace the front height sensor.
STEP 9. Check whether the diagnosis code is reset.
Q.
Is diagnosis code No. B2514 set?
Go to Step 10.
The diagnosis is complete.
STEP 10. Rear height sensor check
Check the rear height sensor for the internal failure. Refer to .
Q.
Is the check result normal?
Go to Step 11.
Replace the rear height sensor.
STEP 11. Check whether the diagnosis code is reset.
Go to Step 3.
Go to Step 2.
).