DTC C13A8/44: Tension Sensor Malfunction: Procedure

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and the Techstream on.
4. Clear the DTC. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and the Techstream on.
4. Check for DTC. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC is output	A
   DTC is not output	B

B → See step   11 

A: Go to next step 

1. Disconnect the S48 ECU connector.
2. Disconnect the S32 actuator connector.
3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying S48 ECU And S32 Actuator Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   S48-8 (TSEN) - S32-5 (TSEN)	Always	Below 1 Ω
   S48-8 (TSEN) - Body ground	Always	10 kΩ or higher
   S48-6 (TSN2) - S32-10 (TSN2)	Always	Below 1 Ω
   S48-6 (TSN2) - Body ground	Always	10 kΩ or higher
   S48-7 (VT) - S32-6 (VT)	Always	Below 1 Ω
   S48-7 (VT) - Body ground	Always	10 kΩ or higher
   S48-14 (TGND) - S32-1 (TGND)	Always	Below 1 Ω
   S48-14 (TGND) - Body ground	Always	10 kΩ or higher
   S48-10 (SG) - S32-2 (SG)	Always	Below 1 Ω
   S48-10 (SG) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying Electric Parking Brake ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   S48-7 (VT) - S48-14 (TGND)	Engine switch on (IG)	4.75 to 5.25 V

   RESULT
   
   

   Result	Proceed to
   Outside of the specified condition	A
   Within the specified condition	B

B → See step   6 

A: Go to next step 

1. Disconnect the S32 actuator connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 3: Identifying Electric Parking Brake Actuator

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   S32-6 (VT) - S32-1 (TGND)	Engine switch on (IG)	4.75 to 5.25 V

NG → See step   9 

OK → See step   10 

1. Connect the S48 ECU connector.
2. Connect the S32 actuator connector.
3. Measure the voltage between the terminals below.

   	Tester Connection	Switch Condition
   (A)	S48-6 (TSN2) - S48-14 (TGND)	Engine switch on (IG)
   (B)	S48-8 (TSEN) - S48-14 (TGND)	Engine switch on (IG)

   HINT: 

   Take a note of the measurements.

4. Turn the engine switch off.
5. Connect the Techstream to the DLC3.
6. Turn the engine switch on (IG) and the Techstream on.
7. Enter the following menus: Chassis / Electric Parking Brake / Data List.
8. Check the values by referring to the table below.

   HINT: 

   This procedure is performed to compare the difference between the actual voltage and the voltage recognized by the ECU.

   ELECTRIC PARKING BRAKE
   
   

   	Tester Display	Measurement Item/Range	Switch Condition	Normal Condition
   (1)	Tension1 Voltage	Tension sensor 1 voltage display/ min.: 0.000 V max.: 5.000 V	Engine switch on (IG)	Voltage (A) +/- 0.2 V is 0.3 to 4.7 V
   (2)	Tension2 Voltage	Tension sensor 2 voltage display/ min.: 0.000 V max.: 5.000 V	Engine switch on (IG)	Voltage (B) +/- 0.2 V is 0.3 to 4.7 V
   (3)	Invalid Tension Sensor Comp	Tension sensor comparison invalid display/ Enable or Disable	Engine switch on (IG)	Enable

   OK

   Values are as shown in normal condition.

   RESULT
   
   

   Result	Proceed to
   (1), (2) or (3) are NG	A
   (1), (2) and (3) are OK	B

B → See step   8 

A: Go to next step 

1. Remove the electric parking brake ECU. Refer to REMOVAL .
2. Measure the resistance according to the value(s) in the table below.
   Fig 4: Identifying Electric Parking Brake ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   8 (TSEN) - 3 (GND1)	Always	4 to 6 kΩ
   6 (TSN2) - 3 (GND1)	Always	4 to 6 kΩ
   14 (TGND) - 3 (GND1)	Always	Below 1 Ω
   10 (SG) - 3 (GND1)	Always	Below 1 Ω

NG → See step   9 

OK → See step   10 

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and the Techstream on.
4. Enter the following menus: Chassis / Electric Parking Brake / Data List.
5. Check the values by referring to the table below.
   ELECTRIC PARKING BRAKE
   
   

   Tester Display	Measurement Item/Range	Switch Condition	Normal Condition
   Invalid Tension Sensor Output	Tension sensor output invalid display/ Enable or Disable	Engine switch on (IG)	Enable
   Invalid Tension Sensor PWR	Tension sensor power source invalid display/ Enable or Disable	Engine switch on (IG)	Enable
   Invalid Tension Sensor Comp	Tension sensor comparison invalid display/ Enable or Disable	Engine switch on (IG)	Enable
   ECU Voltage Monitor	+B power source information display/ min.: 0.00 V max.: 20.00 V	-	11 to 14 V

   OK

   Values are as shown in normal condition.

NG → See step   9 

OK → See step   12