Lexus IS250 IS220d GSE20 ALE20 - BRAKE CONTROL
PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS MOTOR RELAY)
INSPECT SKID CONTROL ECU (GND2 TERMINAL)
DTC C1251/51 Open in Pump Motor Circuit
DESCRIPTION
| DTC No. | DTC Detection Condition | Trouble Area |
| C1251/51 | Actuator pump motor does not operate properly. Open in actuator pump motor circuit continues for at least 2 seconds. |
Brake actuator assembly (GND circuit) Brake actuator assembly (Motor circuit) |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- When replacing the brake actuator assembly, perform zero point calibration .
| 1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS MOTOR RELAY) |
Connect the intelligent tester to the DLC3.
Start the engine.
Select the Active Test mode on the intelligent tester.
Check the operating sound of the ABS motor relay and motor when operating the motor relay with the intelligent tester.
| Item (Display) | Vehicle Condition / Test Details | Diagnostic Note |
| Motor Relay | Turns ABS motor relay ON / OFF | Operating sound of relay (clicking sound) and motor can be heard |
- OK:
- The operating sound of the ABS motor relay and motor can be heard.
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| NG | |
| 2.INSPECT SKID CONTROL ECU (GND2 TERMINAL) |
Turn the engine switch off.
Disconnect the skid control ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition A14-1 (GND2) - Body ground Always Below 1 Ω
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| OK | |
| 3.RECONFIRM DTC |
Reconnect the skid control ECU connector.
Clear the DTC .
Start the engine.
Drive the vehicle at the speed of 4.3 mph (7 km/h) or more.
Check if the same DTC is recorded .
- Result:
Condition Proceed to DTC (C1251/51) is not output A DTC (C1251/51) is output B
- HINT:
If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
If a normal system code is output (trouble code is not output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
If any DTCs are output while jiggling a connector or wire harness of the brake actuator assembly, inspect and repair the connector or wire harness.
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| A | ||
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