Toyota 4Runner: Open or Short in Master Cylinder Pressure Sensor (C1421,C1281,C1423,C1424)

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Open or Short in Master Cylinder Pressure Sensor (C1421,C1281,C1423,C1424)

DESCRIPTION

DTC Code	DTC Detection Condition	Trouble Area
C1421	Either condition is met: Both of the following conditions continue for at least 1.2 seconds. The IG1 terminal voltage is between 9.5 V and 17.0 V. The VM/C1 terminal voltage is not within 4.4 V and 5.6 V. Both of the following conditions continue for at least 1.2 seconds. The VM/C1 terminal voltage is between 4.4 V and 5.6 V. The PM/C1 terminal voltage is not within 0.19 V and 4.57 V.	Master cylinder pressure sensor circuit Master cylinder solenoid (Master cylinder pressure sensor, skid control ECU)
C1423	Both of the following conditions continue for at least 5 seconds The stop light switch is off. The PM/C1 terminal voltage is below 0.3 V.
C1424	One of the following condition is met: Noise occurs in the signal from the PM/C1 terminal 7 times or more within 5 seconds When the vehicle speed drops from 40 km/h (25 mph) to 10 km/h (6 mph), the master cylinder pressure does not change by at least 0.048 MPa. At a vehicle speed of 7 km/h (4 mph) or more, the PM/C1 terminal voltage is between 0.86 and 1.0 V and master cylinder pressure does not change by at least 0.048 MPa for 60 seconds or more. At a vehicle speed of 7 km/h (4 mph) or more, the PM/C1 terminal voltage is 1.0 V or higher and master cylinder pressure does not change by at least 0.048 MPa for 30 seconds or more. At a vehicle speed of 7 km/h (4 mph) or more with the stop light switch ON, a state in which the master cylinder pressure sensor input value is sufficiently greater than the estimated master pressure continues for 1 second of more and this state occurs 5 or more times each time the ignition switch is turned to ON, and this occurs 8 or more times consecutively.
C1281	Stored only during test mode.

CAUTION / NOTICE / HINT

NOTICE:

When replacing the master cylinder solenoid, perform calibration (See page ).

PROCEDURE

1.	REPLACE MASTER CYLINDER SOLENOID

(a) Replace the master cylinder solenoid (See page ).

END

Acceleration Sensor Malfunction (C1420)

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DESCRIPTION Refer to DTCs C1421, C1423 and C1424 (See page ). DTC Code DTC Detection Condition Trouble Area C1422 When the stop light s ...

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