Code No. C2116 Pump
motor voltage low
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caution |
- 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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- ABS-ECU contains the power supply circuit (+BM terminal) for the
pump motor. The pump motor is energised by the motor switch, which is incorporated in ABS-ECU.
- The pump motor switch, which is incorporated in ABS-ECU, is always off unless the
motor solenoid valve check is activated when the vehicle is started.
- ABS-ECU activates the pump motor by turning on the ECU built-in pump motor switch.
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DIAGNOSIS CODE SET CONDITIONS
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This diagnosis codes will be set under the cases below:
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- When the power supply voltage of the pump motor, which is not in operation,
is abnormally low for a prolonged period
- When the power supply voltage of the pump motor, which is not in operation, is abnormally
high for a prolonged period
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Current trouble
- Fusible link malfunction
- Damaged wiring harness and connectors
- Abnormality in battery or alternator
- ABS-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 (+BM terminal) to the ABS-ECU motor
and the 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 diagnostics
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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.C2116 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 SFB5.
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Visually check for open circuit in the fusible link No.4 and SFB5.
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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 ABS-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.4 or SFB5.
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(3)Resistance between the +BM 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 SFB5. 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 ABS-ECU connector +BM terminal and the fusible link, and then replace
the fusible link No.4 or SFB5. Then go to Step 10.
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STEP 7. Voltage measurement at the ABS-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 +BM 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 ABS-ECU connector +BM terminal and the fusible link. Then go to
Step 10.
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STEP 8. Resistance measurement at ABS-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 ABS-ECU connector GND1 terminal and the body earth, and between the ABS-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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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 20 km/h or higher.
note |
The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h
or higher.
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Q.
Is the diagnosis code No.C2116 set?
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Replace the hydraulic unit (integrated with ABS-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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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 20 km/h or higher.
note |
The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h
or higher.
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Q.
Is the diagnosis code No.C2116 set?
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Return to Step 1.
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This diagnosis is complete.
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