Speed Signal Circuit: Procedure

1. Disconnect the F14 meter connector.
   Fig 1: Checking ECU Terminal Voltage (Input Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   F14-28 (+S) - Body ground	Ignition switch ON	4.5 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Combination Meter Assembly)

NG → See step   7 

OK: Go to next step 

1. Disconnect the A6 master cylinder solenoid (skid control ECU) connector.
   Fig 2: Identifying A6 Master Cylinder Solenoid (Skid Control ECU) Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A6-12 (SP1) - Body ground	Ignition switch ON	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Master Cylinder Solenoid (Skid Control ECU))

NG → See step   5 

OK: Go to next step 

1. Check the input waveform.
   Fig 3: Identifying F14 Meter Connector & Waveform Diagram

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Reconnect the F14 meter connector.
   2. Remove the combination meter assembly with the connector(s) still connected.
   3. Connect an oscilloscope to terminal F14-29 (SI) and body ground.
   4. Turn the ignition switch to ON.
   5. Check the signal waveform according to the condition(s) in the table below.
      MEASUREMENT CONDITION
      
      

      Item	Condition
      Terminal No. (Symbol)	F14-29 (SI) - Body ground
      Tool setting	5 V/DIV., 20 ms./DIV.
      Condition	Driving at approx. 20 km/h (12 mph)

      OK

      The waveform displayed is as shown in the illustration.

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

NG → See step   29 

OK → See step   4 

1. Disconnect the F14 meter connector.
2. Disconnect the A6 master cylinder solenoid (skid control ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F14-29 (SI) - A6-12 (SP1)	Always	Below 1 Ω
   A6-12 (SP1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6 

1. Disconnect the F14 meter connector.
2. Disconnect the 4B junction block connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F14-28 (+S) - 4B-20	Always	Below 1 Ω
   F14-28 (+S) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect for a short in the circuit that is connected to the junction block connector shown in the wiring diagram.

   HINT: 

   If voltage is not present, it is possible that an ECU or circuit has a malfunction. The malfunctioning ECU or circuit will be diagnosed in the following steps.

   1. Disconnect the 4A junction block connector.
      Fig 4: Identifying No. 4 Junction Block Connectors 4A, 4B, And AC

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION
      
      

      *1	No. 4 Junction Block	-	-
      *a	Front view of wire harness connector (to No. 4 Junction Block)	-	-

   2. Disconnect the 4C junction block connector.
   3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      4C-16 - Body ground	Ignition switch ON	4.5 to 14 V
      4B-8 - Body ground*	Ignition switch ON	4.5 to 14 V
      4A-90 - Body ground	Ignition switch ON	4.5 to 14 V

      • *: w/ Tire Pressure Warning System
      RESULT
      
      

      Result	Proceed to
      Voltage is not present in one circuit	A
      Voltage is present in all the circuits	B

B → REPLACE NO. 4 JUNCTION BLOCK 

A: Go to next step 

1. Select the circuit for which voltage was not present in the previous step.
   RESULT
   
   

   Tester Connection	System that Uses the Circuit	Proceed to
   4C-16 - Body ground	SFI system, smart key system*1, safety connect system*2, voltage inverter*1	A
   4B-8 - Body ground	Tire pressure warning system*3	B
   4A-90 - Body ground	Audio and visual system or navigation system	C

   • *1: w/ Smart Key System
   • *2: w/ Safety Connect System
   • *3: w/ Tire Pressure Warning System

B → See step   17 

C → See step   18 

A: Go to next step 

1. Disconnect the 4C junction block connector.
2. Disconnect the 5B junction block connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4C-16 - 5B-25	Always	Below 1 Ω
   4C-16 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect for a short in the circuit that is connected to the junction block connector shown in the wiring diagram.
   1. Disconnect the 5A junction block connector.
      Fig 5: Identifying No. 5 Junction Block Connectors 5A And 5B

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION
      
      

      *1	No. 5 Junction Block	-	-
      *a	Front view of wire harness connector (to No. 5 Junction Block)	-	-

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

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      5B-2 - Body ground	Ignition switch ON	4.5 to 14 V
      5B-14 - Body ground*1	Ignition switch ON	4.5 to 14 V
      5A-1 - Body ground*1	Ignition switch ON	4.5 to 14 V
      5A-38 - Body ground*2	Ignition switch ON	4.5 to 14 V

      • *1: w/ Smart Key System
      • *2: w/ Safety Connect System
      RESULT
      
      

      Result	Proceed to
      Voltage is not present in one circuit	A
      Voltage is present in all the circuits	B

B → REPLACE NO. 5 JUNCTION BLOCK 

A: Go to next step 

1. Select the circuit for which voltage was not present in the previous step.
   RESULT
   
   

   Tester Connection	System that Uses the Circuit	Proceed to
   5B-2 - Body ground	SFI system	A
   5B-14 - Body ground*1	Voltage inverter	B
   5A-1 - Body ground*1	Smart key system	C
   5A-38 - Body ground*2	Safety connect system	D

   • *1: w/ Smart Key System
   • *2: w/ Safety Connect System

B → See step   14 

C → See step   15 

D → See step   16 

A: Go to next step 

1. Disconnect the F51*1 or F50*2 ECM connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F51-18 (SPD)*1 - Body ground	Always	10 kΩ or higher
   F50-16 (SPD)*2 - Body ground	Always	10 kΩ or higher

   • *1: for 1GR-FE
   • *2: for 2TR-FE
   RESULT
   
   

   Result	Proceed to
   NG	A
   OK (for 1GR-FE)	B
   OK (for 2TR-FE)	C

B → See step   28 

C → See step   35 

A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the N19 voltage inverter assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N19-2 (SPD) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   31 

1. Disconnect the F80 power management control ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F80-23 (SPD) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   24 

1. Disconnect the F39 telematics transceiver connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F39-10 (SPDP) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   30 

1. Disconnect the F7 tire pressure monitor ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F7-2 (SPD) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   27 

1. Proceed to the appropriate inspection based on the components of the vehicle.
   COMPONENT
   
   

   Component	Proceed to
   w/ Radio Receiver Assembly w/o Stereo Component Amplifier Assembly	A
   w/ Radio Receiver Assembly w/ Stereo Component Amplifier Assembly	B
   w/ Navigation System	C

B → See step   20 

C → See step   22 

A: Go to next step 

1. Disconnect the G9 radio receiver connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G9-3 (SPD) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   25 

1. Disconnect the G9 radio receiver connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 6: Identifying No. 4 Junction Block Connector 4A

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	No. 4 Junction Block	-	-
   *a	Front view of wire harness connector (to No. 4 Junction Block)	-	-

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   4A-90 - Body ground	Ignition switch ON	4.5 to 14 V

NG → See step   21 

OK → See step   33 

1. Disconnect the N11 stereo component amplifier connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 7: Identifying No. 4 Junction Block Connector 4A

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	No. 4 Junction Block	-	-
   *a	Front view of wire harness connector (to No. 4 Junction Block)	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4A-90 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   32 

1. Disconnect the G18 navigation receiver connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 8: Identifying No. 4 Junction Block Connector 4A

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	No. 4 Junction Block	-	-
   *a	Front view of wire harness connector (to No. 4 Junction Block)	-	-

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   4A-90 - Body ground	Ignition switch ON	4.5 to 14 V

NG → See step   23 

OK → See step   26 

1. Disconnect the N11 stereo component amplifier connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 9: Identifying No. 4 Junction Block Connector 4A

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	No. 4 Junction Block	-	-
   *a	Front view of wire harness connector (to No. 4 Junction Block)	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4A-90 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY CIRCUIT) 

OK → See step   34