RX400h · Service Manual BRAKE

C1311/11

Diagnostic trouble codes

DESCRIPTION

ABS main relay 1 (ABS No.1 relay) supplies power to the changeover solenoid and the linear solenoid.
ABS main relay 2 (ABS No.2 relay) goes on for approximately 5 seconds after the ignition switch is turned off and the braking effort signal input is terminated. ABS main relay 2 (ABS No.2 relay) supplies electricity and maintains operating condition for the brake system when the ignition switch is off.
DTC No.
 INF Code
 DTC Detecting Condition
 Trouble Area
C1311/11
 1
  1. Relay contact is off (BS 1 terminal is less than 3.5 V) for at least 0.2 sec. when R1+ terminal voltage is 9.5 V or more and main relay 1 is on.
  2. R1+ terminal voltage is less than 9.5 V and main relay 1 cannot be on for at least 0.2 sec. when main relay 1 is turned on (BS 1 terminal is 3.5 V or more).
  1. ABS main relay 1
    (ABS No.1 relay)
  2. Skid control ECU
  3. Harness and connector
C1312/12
 3
 Relay contact is on for at least 4 sec. when main relay 1 is off.
  1. ABS main relay 1
    (ABS No.1 relay)
  2. Skid control ECU
  3. Harness and connector
C1313/13
 4
  1. Relay contact is off (BS2 terminal is less than 3.5 V) for at least 0.2 sec. when R2+ terminal voltage is 9.5 V or more and main relay 2 is on.
  2. R2+ terminal voltage is less than 9.5 V and main relay 2 cannot be on for at least 2 sec. when main relay 2 is turned on (BS 1 terminal is 3.5 V or more).
  1. ABS main relay 2
    (ABS No.2 relay)
  2. Skid control ECU
  3. Harness and connector
C1314/14
 6
 Relay contact is on for at least 4 sec. when main relay 2 is off.
  1. ABS main relay 2
    (ABS No.2 relay)
  2. Skid control ECU
  3. Harness and connector

WIRING DIAGRAM

Refer to DTCs C1241/41 and C1242/42 (Click here).

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 (ABS NO.1 RELAY, ABS NO.2 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 operation sound of the ABS No.1 and No.2 relays.

    Item
    		 Vehicle Condition / Test Details
    		 Diagnostic Note
    ECB Main Relay
    		 Turns ABS No.1 relay ON/OFF
    		 Operating of solenoid
    (clicking sound) can be heard
    ECB Main Relay 2
    		 Turns ABS No.2 relay ON/OFF
    		 Operating of solenoid
    (clicking sound) can be heard

    OK:
    Operating sound of ABS No.1 and ABS No.2 relays should be heard.



 NG
Go to step 6
OK


2. INSPECT ABS MAIN RELAY (ABS NO.1 RELAY, ABS NO.2 RELAY)

  1. F047762E01
    Remove the ABS No.1 relay and ABS No.2 relay.

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

    Resistance:
    Tester Connection
    		 Specified Condition
    Terminal 1 - Terminal 2
    		 100 Ω
    Terminal 3 - Terminal 5
    		 10 kΩ or higher (No Continuity)

  1. Apply battery voltage between terminals 1 and 2.

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

    Resistance:
    Tester Connection
    		 Specified Condition
    Terminal 3 - Terminal 5
    		 Below 1 Ω



NG
REPLACE ABS NO.1 RELAY OR ABS NO.1 RELAY
OK


3. INSPECT FUSE (ABS NO.1, ABS NO.2 AND ABS NO.3 FUSES)

  1. F100414E01
    Remove the ABS No.1, ABS No.2 and ABS No.3 fuses.

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

    Resistance:
    Fuse
    		 Specified Condition
    ABS No.1 Fuse
    		 Below 1 Ω (Continuity)
    ABS No.2 Fuse
    		 Below 1 Ω (Continuity)
    ABS No.3 Fuse
    		 Below 1 Ω (Continuity)



NG
REPLACE FUSE
OK


4. INSPECT SKID CONTROL ECU (+BI1, +BI2 TERMINAL)

  1. F047485E24
    Measure the voltage according to the value(s) in the table below.

    HINT:
    Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

    Voltage:
    Tester Connection
    		 Specified Condition
    S40-3 (+BI1) - Body ground
    		 10 to 14 V
    S39-5 (+BI2) - Body ground
    		 10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5. INSPECT SKID CONTROL ECU (+BO1, +BO2, R1+, R2+ TERMINAL)

  1. F047485E25
    Measure the voltage according to the value(s) in the table below.

    HINT:
    Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

    Voltage:
    Tester Connection
    		 Specified Condition
    S41-2 (R1+) - Body ground
    		 10 to 14 V
    S40-5 (+BO1) - Body ground
    		 10 to 14 V
    S39-4 (+BO2) - Body ground
    		 10 to 14 V
    S38-17 (R2+) - Body ground
    		 10 to 14 V



NG
REPLACE SKID CONTROL ECU
OK


6. INSPECT SKID CONTROL ECU (BS1, BS2 TERMINAL)

  1. F047485E26
    Measure the voltage according to the value(s) in the table below.

    HINT:
    Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

    Voltage:
    Tester Connection
    		 Specified Condition
    S41-3 (BS1) - Body ground
    		 10 to 14 V
    S38-7 (BS2) - Body ground
    		 10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SKID CONTROL ECU


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