RX400h · Service Manual BRAKE

C1252/52

Diagnostic trouble codes

DESCRIPTION

The skid control ECU detects decreases in the accumulator pressure according to the data from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay.
The skid control ECU usually drives the motor relay 1 for ECB control, and the motor relay 2 for ABS control.
If either is malfunctioning, the will other substitute.
DTC No.
 INF Code
 DTC Detecting Condition
 Trouble Area
C1252/52
 130
 Motor relay is ON for at least 5 min.
  1. ABS MTR1 relay
  2. ABS MTR2 relay
  3. Brake actuator assembly
C1253/53
 132
 Motor relay 1 coil (monitor) is energized for at least 1 sec. when main relay 1 monitor (BS1) is 9.5 V or more and motor relay 1 is off.
  1. ABS MTR1 relay
  2. Wire harness or connector
C1253/53
 133
 Motor relay 1 coil (monitor) is not energized for at least 1 sec. when main relay 1 monitor (BS1) is 9.5 V or more and motor relay 1 is on.
  1. ABS MTR1 relay
  2. Wire harness or connector
C1253/53
 134
 MTT input is 3.5 V or less for at least 0.2 sec. when main relay 1 monitor (BS1) is 9.5 V or more and motor relay 1 is on.
  1. ABS MTR1 relay
  2. Wire harness or connector
  3. Brake actuator pump motor
  4. Brake actuator pump motor circuit
C1253/53
 136
 Motor relay 2 coil (monitor) is energized for at least 1 sec. when main relay 2 monitor (BS2) is 9.5 V or more and motor relay 2 is off.
  1. ABS MTR2 relay
  2. Wire harness or connector
C1253/53
 137
 Motor relay 2 coil (monitor) is not energized for at least 1 sec. (0.2 sec. during initial check) when main rely 2 monitor (BS2) is 9.5 V or more and motor relay 2 is on.
  1. ABS MTR2 relay
  2. Wire harness or connector
C1253/53
 138
 MTT input is 3.5 V or less for at least 1 sec. (0.2 sec. during initial check) when main relay 1 monitor (BS1) is 9.5 V or more and motor relay 2 is on.
  1. ABS MTR2 relay
  2. Wire harness or connector
  3. Brake actuator pump motor
  4. Brake actuator pump motor circuit
C1253/53
 140
 MTT input is 3.5 V or more for at least 2 sec. when motor relay 1 and 2 are off.
  1. ABS MTR1 relay
  2. ABS MTR2 relay
  3. Brake actuator pump motor
  4. Brake actuator pump motor circuit

WIRING DIAGRAM

C100607E04

INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (Click here).


1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ECB MOTOR RELAY)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on.

  1. Select the ACTIVE TEST mode on the intelligent tester.

  1. Check the operating sound of the ABS motor individually when operating it with the intelligent tester.

    ABS / VSC / TRAC: 
    Item
    		 Measurement Item /
    Range (Display)
    		 Normal Condition
    ECB Motor Relay
    		 Turns ABS MTR1 Relay ON/OFF
    		 Operating of solenoid
    (clicking sound) can be heard
    ECB Motor Relay 2
    		 Turns ABS MTR 2 Relay ON/OFF
    		 Operating of solenoid
    (clicking sound) can be heard

    OK:
    The operating sound of the ABS motor should be heard.



 NG
Go to step 6
OK


Go to step 3

2. INSPECT FUSE (ABS MTR1 AND ABS MTR2 FUSES)

  1. F100413E01
    Remove the ABS MTR1 and ABS MTR2 fuses from the engine room R/B No.4.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Fuse
    		 Specified Condition
    ABS MTR1
    		 Below 1 Ω (Continuity)
    ABS MTR2
    		 Below 1 Ω (Continuity)



NG
REPLACE FUSE
OK


Go to step 2

3. INSPECT BRAKE ACTUATOR ASSEMBLY

  1. F047491E01
    Disconnect the brake actuator assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		 Specified Condition
    32 (BM2) - 1 (GND1)
    		 Below 10 Ω
    31 (BM1) - 1 (GND1)
    		 Below 10 Ω
    32 (BM2) - 31 (BM1)
    		 Below 1 Ω
    1 (GND1) - 2 (GND2)
    		 Below 1 Ω
    32 (BM2) - 3 (MTT)
    		 About 33 Ω
    31 (BM1) - 3 (MTT)
    		 About 33 Ω



NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


4. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND BRAKE ACTUATOR ASSEMBLY)

  1. F047492E05
    Disconnect the skid control ECU connector and brake actuator assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		 Specified Condition
    S41-29 (MTT) - B18-3 (MTT)
    		 Below 1 Ω
    B18-1 (GND1) - Body ground
    		 Below 1 Ω
    B18-2 (GND2) - Body ground
    		 Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5. READ VALUE OF INTELLIGENT TESTER (ACCUMULATOR PRESSURE SENSOR)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on.

  1. Select the DTA LIST mode on the intelligent tester.

    ABS / VSC / TRAC: 
    Item
    		 Measurement Item /
    Range (Display)
    		 Normal Condition
    Accumulator Sensor
    		 Accumulator pressure sensor /
    min.: 0 V, max.: 5 V
    		 Specified value: 3.2 to 4.0 V

  1. Depress the brake pedal 4 or 5 times to operate the pump motor, and check the output value on the intelligent tester with the motor stopped (not braking).

    OK:
    Accumulator (ACC) pressure sensor voltage does not drop.



 NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK

REPLACE SKID CONTROL ECU

6. INSPECT ABS MOTOR RELAY

  1. B057491
    Remove the ABS MTR1 relay and ABS MTR 2 relay.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		 Connection
    		 Specified Resistance
    3 - 5
    		 Always
    		 10 kΩ or higher
    (No continuity)
    3 - 5
    		 Apply B+ between terminals 1 and 2
    		 Below 1 Ω



NG
REPLACE ABS MOTOR RELAY
OK


7. CHECK HARNESS AND CONNECTOR (BETWEEN ENGINE ROOM R/B NO.4 AND BATTERY)

  1. C113972E01
    Remove the ABS MTR1 relay and ABS MTR 2 relay.

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

    Voltage:
    Tester Connection
    		 Specified Condition
    ABS MTR1 Relay (5) - Body ground
    		10 to 14 V
    ABS MTR 2 Relay (5) - Body ground
    		 10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8. CHECK HARNESS AND CONNECTOR (BETWEEN ENGINE ROOM R/B NO.4 AND BREAK ACTUATOR ASSEMBLY)

  1. C112024E03
    Disconnect the brake actuator assembly connector.

  1. Remove the ABS MTR1 relay and ABS MTR 2 relay.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		 Specified Condition
    B18-32 (BM2) - ABS MTR 2 Relay (3)
    		Below 1 Ω
    B18-31 (BM1) - ABS MTR1 Relay (3)
    		 Below 1 Ω

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		 Specified Condition
    A2-1 (BM2) - Body ground
    		 10 kΩ or higher
    A2-2 (BM1) - Body ground
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9. CHECK HARNESS AND CONNECTOR (BETWEEN ENGINE ROOM R/B NO.4 AND SKID CONTROL ECU)

  1. C112025E03
    Disconnect the skid control ECU connector.

  1. Remove the ABS MTR1 relay and ABS MTR2 relay.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		Specified Condition
    S41-11 (MR1) - ABS MTR1 Relay (2)
    		 Below 1 Ω
    S41-25 (R1-) - ABS MTR1 Relay (1)
    		 Below 1 Ω
    S38-25 (MR2) - ABS MTR 2 Relay (2)
    		 Below 1 Ω
    S38-30 (R2-) - ABS MTR 2 Relay (1)
    		 Below 1 Ω

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		 Specified Condition
    S41-11 (MR1) - Body ground
    		 10 kΩ or higher
    S41-25 (R1-) - Body ground
    		 10 kΩ or higher
    S38-25 (MR2) - Body ground
    		 10 kΩ or higher
    S38-30 (R2-) - Body ground
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SKID CONTROL ECU


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