CODE No. C2332
Master-Slave communication fail
caution |
Before replacing the ECU,
ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
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OPERATION
The BSW-ECU (master) communicates with the BSW-ECU (slave) through the local CAN lines.
CHECK CONDITION
When all of the conditions below are satisfied:
- Ignition switch is in the ON position.
- BSW-ECU (master) system voltage is at 9-16 V.
DIAGNOSTIC FUNCTION AND JUDGEMENT CRITERIA
When the BSW-ECU (master) cannot receive any CAN signal from the BSW-ECU (slave) for at
least 1 second, the ECU will set diagnosis code No.C2332.
PROBABLE CAUSES
- Local CAN bus circuit fails
- Malfunction power supply circuit to the BSW-ECU (slave)
- Malfunction of the BSW-ECU (master/slave)
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting
).
STEP 2. 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 3
Repair the connector(s) or wiring harness.
STEP 3. 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 4
Repair the connector(s) or wiring harness.
STEP 4. Check of short and open circuit in CNH2 and CNL2 line between
BSW-ECU (master) connector and BSW-ECU (slave) connector
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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 (master) connector terminal CNH2 and
the BSW-ECU (slave) connector terminal CNH2, and between the BSW-ECU (master) connector terminal
CNL2 and the BSW-ECU (slave) connector terminal CNL2. OK: Continuity exists (2 Ω or less)
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(3)Measure the resistance between the BSW-ECU (master) connector terminal CNH2 and
body earth, and between the BSW-ECU (master) connector terminal CNL2 and body earth. OK: No continuity
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(4)Measure the resistance between the BSW-ECU (master) connector terminal CNH2 and
any of the other terminals, and between the BSW-ECU (master) connector terminal CNL2 and any
of the other terminals. OK: No continuity
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Q.
Is the check result normal?
Go to Step 5
Repair the connector(s) or wiring harness.
STEP 5. Measure the terminal resistance at the BSW-ECU.
caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the BSW-ECU (master/slave), and measure at the equipment side.
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(2)Resistance between the BSW-ECU (master) connector terminal CNH2 and CNL2. OK: 120 ± 20 Ω
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(3)Resistance between the BSW-ECU (slave) connector terminal CNH2 and CNL2. OK: 120 ± 20 Ω
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Q.
Is the check result normal?
Go to Step 6
Replace a defective ECU.
STEP 6. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the BSW-ECU (master).
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the BSW-ECU (slave). Then Go to Step 7.
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to cope with Intermittent Malfunction).
STEP 7. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the BSW-ECU (master).
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Use the BSW-ECU (slave), which has been removed at step 6, as the BSW-ECU (master).
This diagnosis is complete.