Code No. C2104
Valve power supply circuit
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- If there is
any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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- ASC-ECU contains the power supply circuit (+BV terminal) for the
solenoid valve. The solenoid valve is energised by the valve relay, which is incorporated in
ASC-ECU.
- The valve relay, which is incorporated in ASC-ECU, is always energising the solenoid
valve unless the initial check is in progress when the ignition switch is turned on, and the recurrent
system check is in progress.
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DIAGNOSIS CODE SET CONDITIONS
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This diagnostic trouble codes will be set when the solenoid valve supply voltage is not
within the standard value.
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Current trouble
- Fusible link malfunction
- Damaged wiring harness and connectors
- Abnormality in battery or alternator
- ASC-ECU malfunction
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Past trouble
- Carry out diagnosis with particular emphasis on wiring harness and
connector failures between the power supply circuit (+BV terminal) to ASC-ECU solenoid
valve or earth circuit (GND1, GND2 terminal). For diagnosis procedures, refer to How to treat
past trouble (GROUP 00 - How to Use Troubleshooting/How to Treat Past Trouble ).
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 3
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Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Q.
Is the diagnosis code No. C2104 set?
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Go to Step 3
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This diagnosis is complete.
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Refer to GROUP 54A - Battery Test .
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Q.
Is the battery in good condition?
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Go to Step 4
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Replace the battery. Then go to Step 10.
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STEP 4. Charging system check
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Refer to GROUP 16 - On-vehicle Service/Alternator Output Line
Voltage Drop Test .
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Q.
Is the charging system in good condition?
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Go to Step 5
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Repair or replace the charging system component(s). Then go to Step 10.
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STEP 5. Fusible link check: Check the fusible link No.4 and SBF7.
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Visually check for open circuit in the fusible link No.4 and SBF7.
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Q.
Is the check result normal?
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Go to Step 7
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Go to Step 6
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STEP 6. Resistance measurement at ASC-ECU connector
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Disconnect the fusible link No.SBF7.
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(3)Resistance between the +BV terminal and the body earth. OK: No continuity
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Q.
Is the check result normal?
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Replace the fusible link No.4 or SBF7. Then go to Step 10.
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The short circuit may be present in the power supply circuit. Repair the wiring
harness between the ASC-ECU connector +BV terminal and the fusible link, and then replace
the fusible link No.4 or SBF7. Then go to Step 10.
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STEP 7. Voltage measurement at the ASC-ECU connector
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the voltage between the +BV terminal and the body earth. OK: Approximately system voltage
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Q.
Is the check result normal?
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Go to Step 8
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The open circuit may be present in the power supply circuit. Repair the wiring
harness between the ASC-ECU connector +BV terminal and the fusible link. Then go to
Step 10.
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STEP 8. Resistance measurement at ASC-ECU connector
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Resistance between the GND1 terminal and the body earth, and between the GND2 terminal
and the body earth OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 9
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An open circuit may be present in the earth circuit. Repair the wiring harness
between the ASC-ECU connector GND1 terminal and the body earth, and between the ASC-ECU connector
GND2 terminal and the body earth. Then go to Step 10.
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STEP 9. Check whether the diagnosis code is reset.
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Erase the diagnosis code.
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Q.
Is the diagnosis code No.C2104 set?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Then go to Step 10.
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How
to Cope with Intermittent Malfunctions ).
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STEP 10. Check whether the diagnosis code is reset.
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Erase the diagnosis code.
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Q.
Is diagnosis code No.C2104 set?
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Return to Step 1.
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This diagnosis is complete.
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