DTC 75
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM (for 2AZ-FE): C1235/35, C1236/36, C1238/38, C1239/39, C1275/75-C1278/78: Foreign Object is Attached on Tip of Front Speed Sensor RH
C1278/78 - Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)
DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for the ABS control system.
Speed sensor rotors have rows of alternating N and S magnetic poles (for rear 2WD) or 48 serrations (except for rear 2WD). The hall IC type speed sensor use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect vehicle speeds even when the vehicle is nearly stationary.
When foreign matter or oil adheres to the speed sensor tip or speed sensor rotor, these DTCs are output. An abnormal waveform input from the sensor determines these conditions.
These DTCs may be detected when a malfunction occurs in the connector terminals or wire harness of the speed sensor circuit.
DTCs C1275/75 to C1278/78 will be deleted when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1275/75 to C1278/78 are output only in Test Mode.
HINT
* DTCs C1235/35 and C1275/75 are for the front speed sensor RH.
* DTCs C1236/36 and C1276/76 are for the front speed sensor LH.
* DTCs C1238/38 and C1277/77 are for the rear speed sensor RH.
* DTCs C1239/39 and C1278/78 are for the rear speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration Programming and Relearning.
HINT
When C0200/31, C0205/32, C0210/33 and/or C0215/34 is output together with C1235/35, C1236/36, C1238/38, or C1239/39, inspect and repair the trouble areas indicated by C0200/31, C0205/32, C0210/33 and/or C0215/34 first C0200 for front, or C0210 for rear).
PROCEDURE
1. INSPECT SPEED SENSOR
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(b) Disconnect each speed sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 2WD RH
for 4WD RH
for 2WD LH
for 4WD LH
Result:
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
B -- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SPEED SENSOR)
C -- REPLACE SPEED SENSOR
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)
(a) Disconnect the skid control sensor wire.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NG -- REPLACE SKID CONTROL SENSOR WIRE
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SPEED SENSOR)
(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU (SENSOR INPUT)
(a) Reconnect the skid control ECU connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for RH
for LH
NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Turn the ignition switch off.
(b) Reconnect the skid control sensor wire (for rear 2WD).
(c) Reconnect the speed sensor connector.
(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Start the engine.
(f) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(g) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR
C -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System
A -- Continue to next step.
6. CHECK SPEED SENSOR TIP
(a) Turn the ignition switch off.
(b) Remove the front speed sensor or the rear speed sensor Removal for front, or Removal for rear).
(c) Check the speed sensor tip.
OK:
No scratches, oil or foreign matter on the sensor tip.
NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
NG -- CLEAN OR REPLACE SPEED SENSOR
OK -- Continue to next step.
7. CHECK SPEED SENSOR ROTOR
(a) Remove the front speed sensor rotor or the rear speed sensor rotor Removal for front or Removal for rear).
(b) Check the speed sensor rotors.
OK:
No scratches, oil, or foreign matter on the rotors.
NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
HINT
* If the front speed sensor rotor needs to be replaced, replace it together with the front axle outboard joint shaft assembly.
* If the rear speed sensor rotor needs to be replaced, replace it together with the rear drive outboard joint shaft assembly.
NG -- CLEAN OR REPLACE SPEED SENSOR ROTOR
OK -- Continue to next step.
8. RECONFIRM DTC
(a) Install the speed sensor and the speed sensor rotor.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Start the engine.
(d) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System
A -- Continue to next step.
9. REPLACE SPEED SENSOR
(a) Turn the ignition switch off.
(b) Replace the front speed sensor or the rear speed sensor Removal for front, or Removal for rear).
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
10. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- Continue to next step.
11. REPLACE SPEED SENSOR ROTOR
(a) Turn the ignition switch off.
(b) Remove the front drive shaft assembly or the rear drive shaft assembly Removal for front or Removal for rear).
(c) Replace the front axle outboard joint shaft assembly (front speed sensor rotor) or the rear drive outboard joint shaft assembly (rear speed sensor rotor) Disassembly for front or Disassembly for rear).
HINT
* If the front speed sensor rotor needs to be replaced, replace it together with the front axle outboard joint shaft assembly.
* If the rear speed sensor rotor needs to be replaced, replace it together with the rear drive outboard joint shaft assembly.
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
12. RECONFIRM DTC
(a) Install the drive shaft assembly.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Start the engine.
(d) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
13. REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR
(a) Turn the ignition switch off.
(b) Replace the rear speed sensor Removal.
(c) Replace the rear axle hub and bearing assembly (rear speed sensor rotor) Removal for torsion beam type suspension, or Removal for double wishbone type suspension).
HINT
The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly with rear speed sensor.
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
14. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal