RX400h · Service Manual BRAKE

C1315/31

Diagnostic trouble codes

DESCRIPTION

Each solenoid adjusts pressure which affects each wheel cylinder according to signals from the skid control ECU and controls the vehicle.
The master cut solenoid (SMC 1/2) is closed and blocks the master cylinder pressure from the ECB control pressure when the system is normal. The master cut solenoid is open and sends the master cylinder fluid pressure to the non-assisted brake wheel cylinders during the fail safe due to system malfunction.
DTC No.
 INF Code
 DTC Detecting Condition
 Trouble Area
C1315/31
 61
  1. SMC1 drive circuit is malfunctioning for 0.05 sec. or more.
  2. Short to +B.
  1. Brake actuator assembly (SMC1)
  2. Skid control ECU
  3. Harness and connector
C1315/31
 62
 Open circuit in SMC1 continues for 0.05 sec. or more when SMC1 is off
  1. Brake actuator assembly (SMC1)
  2. Skid control ECU
  3. Harness and connector
C1315/31
 63
 Open circuit in SMC1 continues for 0.05 sec. or more when SMC1 is off
  1. Brake actuator assembly (SMC1)
  2. Skid control ECU
  3. Harness and connector
C1315/31
 64
 Over current in SMC1 continues for 0.05 sec. or more.
  1. Brake actuator assembly (SMC1)
  2. Skid control ECU
  3. Harness and connector
C1316/32
 66
  1. SMC1 driver circuit is malfunctioning for 0.05 sec. or more.
  2. Short to +B.
  1. Brake actuator assembly (SMC2)
  2. Skid control ECU
  3. Harness and connector
C1316/32
 67
 Open circuit in SMC2 continues for 0.05 sec. or more when SMC2 is off.
  1. Brake actuator assembly (SMC2)
  2. Skid control ECU
  3. Harness and connector
C1316/32
 68
 Open circuit in SMC2 continues for 0.05 sec. or more.
  1. Brake actuator assembly (SMC2)
  2. Skid control ECU
  3. Harness and connector
C1316/32
 69
 Open circuit in SMC2 continues for 0.05 sec. or more.
  1. Brake actuator assembly (SMC2)
  2. Skid control ECU
  3. Harness and connector
C1352/21
 11
 Open circuit in SLAFR continues for 0.05 sec. or more when SLAFR is off.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1352/21
 12
 Open circuit in SLAFR continues for 0.05 sec. or more when SLAFR is on.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1352/21
 13
 Short to +B or voltage leak in SLAFR continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1352/21
 14
 Over current in SLAFR continues for 0.05 sec. or more
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1353/23
 21
 Open circuit in SLAFL continues for 0.05 sec. or more when SLAFL is off.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1353/23
 22
 Open circuit in SLAFL continues for 0.05 sec. or more when SLAFL is on.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1353/23
 23
 Short to +B or voltage leak in SLAFL continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1353/23
 24
 Over current in SLAFL continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1354/25
 31
 Open circuit in SLARR continues for 0.05 sec. or more when SLARR is off
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1354/25
 32
 Open circuit in SLARR continues for 0.05 sec. or more when SLARR is on.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1354/25
 33
 Short to +B or voltage leak in SLARR continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1354/25
 34
 Over current in SLARR continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1355/27
 41
 Open circuit in SLARL continues for 0.05 sec. or more when SLARL is off.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1355/27
 42
 Open circuit in SLARL continues for 0.05 sec. or more when SLARL is on.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1355/27
 43
 Short to +B or voltage leak in SLARL continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1355/27
 44
 Over current in SLARL continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1356/22
 16
 Open circuit in SLRFR continues for 0.05 sec. or more when SLRFR is off.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1356/22
 17
 Open circuit in SLRFR continues for 0.05 sec. or more when SKRFR is on.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1356/22
 18
 Short to +B or voltage leak in SLRFR continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1356/22
 19
 Over current in SLRFR continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1357/24
 26
 Open circuit in SLRFL continues or 0.05 sec. or more when SLRFL is off.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1357/24
 27
 Open circuit in SLRFL continues for 0.05 sec. or more when SLRFL is on.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1357/24
 28
 Short to +B or voltage leak in SLRFL continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1357/24
 29
 Over current in SLRFL continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1358/26
 36
 Open circuit in SLRRR continues for 0.05 sec. or more when SLRRR is off.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1358/26
 37
 Open circuit in SLRRR continues for 0.05 sec. or more when SLRRR is on.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1358/26
 38
 Short to +B or voltage leak in SLRRR continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1358/26
 39
 Over current in SLRRR continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1359/28
 46
 Open circuit in SLRRL continues for 0.05 sec. or more when SLRRL is off.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1359/28
 47
 Open circuit in SLRRL continues for 0.05 sec. or more when SLRRL is on.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1359/28
 48
 Short to +B or voltage leak in SLRRL continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector
C1359/28
 49
 Over current in SLRRL continues for 0.05 sec. or more.
  1. Brake actuator assembly
  2. Skid control ECU
  3. Harness and connector

WIRING DIAGRAM

C112019E03
C112020E03

INSPECTION PROCEDURE

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


1. INSPECT BRAKE ACTUATOR ASSEMBLY

  1. F047491E02
    Disconnect the brake actuator connector.

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

    HINT:
    Check the brake actuator assembly when it is cooled down.

    Resistance:
    Tester Connection
    		 Specified Condition
    37 (SMC1) - 36 (BS1)
    		 15.3 to 17.3 Ω
    19 (SMC2) - 20 (BS2)
    		 15.3 to 17.3 Ω
    44 (SLAFR+) - 43 (SLAFR-)
    		 3.6 to 4.2 Ω
    28 (SLRFR+) - 27 (SLRFR-)
    		 3.6 to 4.2 Ω
    35 (SLAFL+) - 38 (SLAFL-)
    		 3.6 to 4.2 Ω
    21 (SLRFL+) - 22 (SLRFL-)
    		 3.6 to 4.2 Ω
    41 (SLARL+) - 42 (SLARL-)
    		 3.6 to 4.2 Ω
    25 (SLRRL+) - 26 (SLRRL-)
    		 4.4 to 5.0 Ω
    39 (SLARR+) - 40 (SLARR-)
    		 3.6 to 4.2 Ω
    23 (SLRRR+) - 24 (SLRRR-)
    		 4.4 to 5.0 Ω



NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


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

  1. Measure the voltage according to the value(s) in the table below.F047497E02

    Voltage:
    Tester Connection
    		 Condition
    		 Specified Condition
    S41-4 (SMC1) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 10 to 14 V
    S38-3 (SMC2) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 10 to 14 V
    S41-7 (FRA+) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Pulse generation (see waveform 1)
    (Click here)
    S41-6 (FRA-) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Pulse generation (see waveform 1)
    (Click here)
    S38-1 (FLA+) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Pulse generation (see waveform 1)
    (Click here)
    S38-2 (FLA-) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Pulse generation (see waveform 1)
    (Click here)
    S38-19 (RRA+) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Pulse generation (see waveform 1)
    (Click here)
    S38-9 (RRA-) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Pulse generation (see waveform 1)
    (Click here)
    S41-15 (RLA+) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Pulse generation (see waveform 1)
    (Click here)
    S41-27 (RLA-) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Pulse generation (see waveform 1)
    (Click here)
    S41-17 (FRR+) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Below 1.5 V
    S38-8 (FLR+) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Below 1.5 V
    S38-20 (RRR+) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Below 1.5 V
    S41-16 (RLR+) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Below 1.5 V
    S41-34 (FRR-) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Below 1.5 V
    S38-26 (FLR-) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Below 1.5 V
    S38-18 (RRR-) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Below 1.5 V
    S41-26 (RLR-) - Body ground
    		 Ignition switch ON
    Brake pedal released
    		 Below 1.5 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SKID CONTROL ECU


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