ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1407, C1408

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DESCRIPTION

Refer to DTCs C1401 and C1402 (Click here).

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INSPECTION PROCEDURE

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PROCEDURE

1. Click here

   CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

   
   

   1. Using the GTS, check for any momentary interruption in the wire harness and connector corresponding to the DTC (Click here).

      Table 1. ABS/VSC/TRC

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      RR Speed Open	Rear speed sensor RH open detection/ Error or Normal	Normal	-
      RL Speed Open	Rear speed sensor LH open detection/ Error or Normal	Normal	-

      OK
      Normal (there are no momentary interruptions).

      Tip:

      Perform the above inspection before removing the sensor and connector.

   
   
   • OKClick here
   • NGClick here
2. Click here

   READ VALUE USING GTS (RR/RL WHEEL SPEED)

   
   

   1. Turn the ignition switch off.

   2. Connect the GTS to the DLC3.

   3. Start the engine.

   4. Turn the GTS on.

   5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      Table 2. ABS/VSC/TRC

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      RR Wheel Speed	Rear speed sensor RH reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Actual wheel speed	No large fluctuations when driving at a constant speed.
      RL Wheel Speed	Rear speed sensor LH reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Actual wheel speed	No large fluctuations when driving at a constant speed.

   6. Check that there is no difference between the speed value output from the speed sensor displayed on the GTS and the speed value displayed on the speedometer when driving the vehicle.

      Tip:

      Factors that affect the indicated vehicle speed include tire size, tire inflation and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart (Click here).

      OK
      The speed value output from the speed sensor displayed on the GTS is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

   
   
   • OKClick here
   • NGClick here
3. Click here

   RECONFIRM DTC

   
   

   1. Clear the DTC (Click here).

   2. Turn the ignition switch off.

   3. Start the engine.

   4. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

   5. Check if the same DTC is output (Click here).

      Table 3. Result

      Result	Proceed to
      DTC is not output	A
      DTC is output (for LHD)	B
      DTC is output (for RHD)	C

   
   
   • AClick here
   • BClick here
   • CClick here
4. Click here

   INSPECT SKID CONTROL SENSOR WIRE

   Table 4. Text in Illustration

   *A	for RH	*B	for LH
   *1	Skid Control Sensor Wire	-	-

   
   

   1. Remove the skid control sensor wire (Click here).

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

      Standard Resistance
      Table 5. for RH Tester Connection Condition Specified Condition Nz1-4 - z19-2 (RR+) Always Below 1 Ω Nz1-3 - z19-1 (RR-) Always Below 1 Ω Nz1-4 - Nz1-3 Always 10 kΩ or higher Nz1-4 - Nz1-1 Always 10 kΩ or higher Nz1-4 - Nz1-2 Always 10 kΩ or higher
      Table 6. for LH Tester Connection Condition Specified Condition Nz1-2 - z20-2 (RL+) Always Below 1 Ω Nz1-1 - z20-1 (RL-) Always Below 1 Ω Nz1-2 - Nz1-1 Always 10 kΩ or higher Nz1-2 - Nz1-3 Always 10 kΩ or higher Nz1-2 - Nz1-4 Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)

   
   

   1. Install the skid control sensor wire.

   2. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

   3. Disconnect the z19 and/or z20 speed sensor connector.

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

      Standard Resistance
      Table 7. for RH Tester Connection Condition Specified Condition A24-5 (RR+) - z19-2 (RR+) Always Below 1 Ω A24-5 (RR+) - Body ground Always 10 kΩ or higher A24-19 (RR-) - z19-1 (RR-) Always Below 1 Ω A24-19 (RR-) - Body ground Always 10 kΩ or higher
      Table 8. for LH Tester Connection Condition Specified Condition A24-20 (RL+) - z20-2 (RL+) Always Below 1 Ω A24-20 (RL+) - Body ground Always 10 kΩ or higher A24-6 (RL-) - z20-1 (RL-) Always Below 1 Ω A24-6 (RL-) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
6. Click here

   CHECK HARNESS AND CONNECTOR (RR+/RL+ TERMINAL)

   
   

   1. Connect the skid control ECU (master cylinder solenoid) connector.

   2. Disconnect the speed sensor connector.

   3. 

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

      Standard Voltage
      Table 9. for RH Tester Connection Switch Condition Specified Condition z19-2 (RR+) - Body ground Ignition switch ON 11 to 14 V
      Table 10. for LH Tester Connection Switch Condition Specified Condition z20-2 (RL+) - Body ground Ignition switch ON 11 to 14 V

      Table 11. Text in Illustration

      *A	for RH
      *B	for LH
      *a	Front view of wire harness connector (to Rear Speed Sensor)

      Table 12. Result

      Result	Proceed to
      OK	A
      NG (for LHD)	B
      NG (for RHD)	C

   
   
   • AClick here
   • BClick here
   • CClick here
7. Click here

   REPLACE MASTER CYLINDER SOLENOIDClick here

8. Click here

   REPLACE SKID CONTROL SENSOR WIREClick here

9. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

10. Click here

    REPLACE REAR SPEED SENSORClick here

11. Click here

    CHECK FOR INTERMITTENT PROBLEMSClick here

12. Click here

    REPLACE MASTER CYLINDER SOLENOIDClick here