Dtc C1253 Pump Motor Relay
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)
RECONFIRM DTC
CHECK TERMINAL VOLTAGE (+BM1, +BM2)
CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL)
RECONFIRM DTC
DTC C1253 Pump Motor Relay |
DESCRIPTION
The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU.DTC Code
| DTC Detection Condition
| Trouble Area
|
C1253
| There is a motor system circuit (motor input circuit) malfunction.
| - ABS NO. 1 fuse
- Motor relay circuit
- Master cylinder solenoid (Skid control ECU)
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- When replacing the master cylinder solenoid, perform calibration (LandCruiser RM00000452J00ZX.html).
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
| 1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY) |
Turn the ignition switch off.
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the intelligent tester on.
Start the engine.
Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.
ABS/VSC/TRCTester Display
| Test Part
| Control Range
| Diagnostic Note
|
Motor Relay
| Motor relay
| Relay ON/OFF
| An operating sound of the motor can be heard.
|
Check the operating sound of the motor individually when operating it with the intelligent tester.
- OK:
- An operating sound of the motor can be heard.
Clear the DTCs (LandCruiser RM0000046KV016X.html).
Turn the ignition switch off.
Depress the brake pedal more than 40 times.
Turn the ignition switch to ON.
Wait until the pump motor stops.
Depress the brake pedal several times until the pump motor turns on. (Procedure A)
Wait until the pump stops. (Procedure B)
Repeat the above steps (procedure A and B) 3 more times.
Check if the same DTC is output (LandCruiser RM0000046KV016X.html).
- HINT:
- Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.
ResultResult
| Proceed to
|
DTC is not output
| A
|
DTC is output (for LHD)
| B
|
DTC is output (for RHD)
| C
|
| 3.CHECK TERMINAL VOLTAGE (+BM1, +BM2) |
Disconnect the A7 and A8 skid control ECU connectors.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
A7-2 (+BM1) - Body ground
| Always
| 11 to 14 V
|
A8-2 (+BM2) - Body ground
| Always
| 11 to 14 V
|
Text in Illustration*a
| Front view of wire harness connector
(to Skid Control ECU)
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL) |
Disconnect the A7 and A8 skid control ECU connectors.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
A7-1 (GND1) - Body ground
| Always
| Below 1 Ω
|
A7-32 (GND2) - Body ground
| Always
| Below 1 Ω
|
A8-4 (GND3) - Body ground
| Always
| Below 1 Ω
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
Clear the DTCs (LandCruiser RM0000046KV016X.html).
Turn the ignition switch off.
Depress the brake pedal more than 40 times.
Turn the ignition switch to ON.
Wait until the pump motor stops.
Depress the brake pedal several times until the pump motor turns on. (Procedure A)
Wait until the pump stops. (Procedure B)
Repeat the above steps (procedure A and B) 3 more times.
Check if the same DTC is output (LandCruiser RM0000046KV016X.html).
- HINT:
- Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.
ResultResult
| Proceed to
|
DTC is not output
| A
|
DTC is output (for LHD)
| B
|
DTC is output (for RHD)
| C
|
