C1361

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0273/13: Open in ABS Motor Relay Circuit

DTC C0273/13 - Open in ABS Motor Relay Circuit

DTC C0274/14 - Short to B+ in ABS Motor Relay Circuit

DTC C1361/91 - Short Circuit in ABS Motor Fail Safe Relay Circuit

DESCRIPTION

- The ABS motor relays consist of the 2 semiconductor relays and are included in the J/B NO. 2.
- The ABS motor relay 1 is turned on after turning the ignition switch to the ON position. If the DTCs in the ABS pump motor circuit are memorized, the ABS motor relay 1cuts off the power supply to the ABS motor relay 2 and performs the fail safe.
- While any of the ABS, BA, TRAC and VSC is operating, the skid control ECU (included in the actuator) turns the ABS motor relay 2 on to operate the actuator pump motor.
- If the voltage applied to the ABS motor relays (+BM) drops below the condition that detects the DTCs due to the shortage of the battery or alternator output, the DTCs may be memorized.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT ABS NO. 2 FUSE
(a) Remove the ABS NO. 2 fuse from the FL block.

(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE ABS NO. 2 FUSE
OK -- Continue to next step.
2. CHECK JUNCTION BLOCK NO. 2 (+BM TERMINAL)
(a) With the ignition switch off, remove the J/B NO. 2 with the wire harness still connected.

(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)
OK -- Continue to next step.
3. CHECK JUNCTION BLOCK NO. 2 (GND TERMINAL)
(a) With the ignition switch off, remove the J/B NO. 2 with the wire harness still connected.

(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (JUNCTION BLOCK NO. 2 - SKID CONTROL ECU)
(a) With the ignition switch off, disconnect the skid control ECU connector and the J/B NO. 2 connectors.

(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (JUNCTION BLOCK NO. 2 - SKID CONTROL ECU)
OK -- Continue to next step.
5. CHECK JUNCTION BLOCK NO. 2
(a) With the ignition switch off, remove the J/B NO. 2.

(b) Connect the battery positive lead to terminal +BM of the J/B NO. 2 and the negative lead to terminal SGND, PGND, MRF and MR.

(d) Connect the battery positive lead to terminal R+ of the J/B NO. 2 in addition to terminal +BM.

(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPLACE JUNCTION BLOCK NO. 2
OK -- Continue to next step.
6. RECONFIRM DTC
(a) Clear the DTCs .
(b) Drive the vehicle at a speed of 4 mph (6 km/h) or more.
(c) Check if the same DTCs are recorded .
Result:

HINT:
- The skid control ECU inspects the motor relay circuit when the stop light switch is turned off and the vehicle is running at a speed of 4 mph (6 km/h) or more.
- It is suspect that the DTCs were output due to a poor connection of the connector terminal.

B -- END
A -- REPLACE BRAKE ACTUATOR ASSEMBLY