Inspection Procedure
2: Power supply to the BSW-ECU (slave) fails (Cannot communicate with BSW-ECU (slave) using
the M.U.T.-III.)
caution |
When replacing the ECU, always
check that the communication circuit is normal.
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COMMENTS ON TROUBLE SYMPTOM
BSW-ECU (slave) is communicating with M.U.T.-III via CAN. Therefore, communication error of
BSW-ECU (slave) is suspected.
note |
Check whether the BSW-ECU (master) sets diagnosis code No. C2332. Then follow this diagnosis.
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PROBABLE CAUSES
- Malfunction of the power supply and the earth of BSW-ECU (slave)
- Malfunction of the BSW-ECU (slave)
DIAGNOSIS PROCEDURE
STEP 1. Resistance measurement at BSW-ECU (slave) connector
terminal GND.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the BSW-ECU (slave) connector terminal GND and body
earth. OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Go to Step 2
Repair the connector(s) or wiring harness.
STEP 2. Voltage measurement at BSW-ECU (slave) connector terminal
IG.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Check the voltage between the BSW-ECU (slave) connector terminal IG and body earth. OK: System voltage
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Q.
Is the check result normal?
Go to Step 3
Repair the connector(s) or wiring harness.
STEP 3. Retest the system
Check if M.U.T.-III can communicate with the BSW-ECU (slave).
Q.
Is the check result normal?
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use
Troubleshooting/Inspection Service Points - How to cope with Intermittent Malfunction).
Replace the BSW-ECU (slave).