Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: ABS Pump Motor Drive Circuit Supply Voltage Circuit Voltage Below Threshold (C116516)

DESCRIPTION

The ABS motor relay is built into the brake actuator assembly.

When the skid control ECU (brake actuator assembly) operates ABS, TRAC, VSC, brake hold or brake assist, the ABS motor relay turns ON and drives the motor pump built into the brake actuator assembly.

If the voltage supplied to the motor relay (+BM terminal) is below the DTC detection threshold due to low voltage from the auxiliary battery or DC/DC converter circuit, these DTCs may be stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C116516

ABS Pump Motor Drive Circuit Supply Voltage Circuit Voltage Below Threshold

A low ABS motor relay voltage is detected.

Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before performing troubleshooting, make sure to confirm that the auxiliary battery voltage is normal.

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PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(b) Disconnect the A151 skid control ECU (brake actuator assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A151-1 (+BM) - Body ground

Always

11 to 14 V

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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