C0274 Short to B+ in ABS Motor Relay Circuit

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Dia Code: 14

DESCRIPTION
While the ABS is operating, the skid control ECU turns the ABS MTR MAIN relay on and activates the pump motor in the brake actuator.
These codes may be stored if the motor relay (BM) voltage becomes lower than a specified level due to
insufficient output from the battery or alternator.

DTC Code Diag Code DTC Detection Condition Trouble Area
C0273 13 When either of the following is detected:
  1. When IG1 terminal voltage is 20 to 32 V, the relay contact is OFF (MT terminal voltage is less than 2 V) for 0.2 seconds or more.
  2. IG1 terminal voltage lowers due to turning the relay ON, and the relay contact is not ON for 0.2 seconds or more.
• ABS fuse
• ABS MTR MAIN relay
• ABS MTR MAIN relay circuit
• Brake actuator assembly
• Skid control ECU
C0274 14 When either of the following is detected:
  1. When the relay is OFF, the relay contact is ON (MT terminal voltage is 2 V or more) for 4 seconds or more.
  2. When the relay is OFF, an open in the MT terminal continues for 4 seconds or more.
• ABS fuse
• ABS MTR MAIN relay
• ABS MTR MAIN relay circuit
• Brake actuator assembly
• Skid control ECU

WIRING DIAGRAM



INSPECTION PROCEDURE

1.INSPECT ABS FUSE

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2.INSPECT ABS MOTOR RELAY (ABS MTR MAIN)

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3.INSPECT NO. 2 RELAY BLOCK (POWER SOURCE TERMINAL)

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4.INSPECT BRAKE ACTUATOR ASSEMBLY

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5.CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR - NO. 2 RELAY BLOCK)

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6.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)

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7.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - NO. 2 RELAY BLOCK)

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8.RECONFIRM DTC

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9.DTC Clear

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