Speed Signal Circuit: Procedure

1. Disconnect the D100 combination meter assembly connector.
   Fig 1: Identifying D100 Combination Meter Assembly Connector Terminal

   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
   D100-6 (+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)

   HINT: 

   If any of the ECUs specified in the wiring diagram supplies power to the combination meter assembly, the combination meter assembly will output a waveform.

3. Reconnect the combination meter assembly connector.

NG → See step   9 

OK: Go to next step 

1. Check the vehicle specifications.
   RESULT
   
   

   Result	Proceed to
   w/ ABS	A
   w/o ABS	B

B → See step   5 

A: Go to next step 

NG → See step   7 

OK: Go to next step 

NG → See step   16 

OK → See step   15 

1. Disconnect the C57 speedometer sensor connector.
   Fig 2: Identifying C57 Speedometer Sensor Connector Terminal

   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
   C57-3 (SI) - Body ground	Ignition switch ON	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Speedometer Sensor)

3. Reconnect the C57 speedometer sensor connector.

NG → See step   8 

OK: Go to next step 

1. Check the input waveform.
   Fig 3: Identifying Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Remove the combination meter assembly with the connector(s) still connected.
   2. Connect an oscilloscope to terminal D100-5 (SI) and body ground.
   3. Turn the ignition switch to ON.
   4. Turn the wheel slowly.
   5. Check the signal waveform according to the condition(s) in the table below.

      Item	Condition
      Tool setting	5 V/DIV., 20 ms./DIV.
      Vehicle condition	Driving at approx. 20 km/h (12 mph)

      OK

      The waveform is displayed as shown in the illustration.

      HINT: 

      As the vehicle speed increases, the cycle of the waveform narrows.

      TEXT IN ILLUSTRATION
      
      

      *a	Component with harness connected (Combination Meter Assembly)
      *b	Waveform

NG → REPLACE SPEEDOMETER SENSOR 

OK → See step   17 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   18 

1. Disconnect the D100 combination meter assembly connector.
2. Disconnect the C57 speedometer sensor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C57-3 (SI) - D100-5 (SI)	Always	Below 1 Ω
   C57-3 (SI) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   19 

1. Disconnect the 3B instrument panel junction block assembly connector.
2. Disconnect the D100 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D100-6 (+S) - 3B-15	Always	Below 1 Ω
   D100-6 (+S) - Body ground	Always	10 kΩ or higher

4. Reconnect the 3B instrument panel junction block assembly connector.
5. Reconnect the D100 combination meter assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the 3C instrument panel junction block assembly connector.
   Fig 4: Identifying 3C Instrument Panel Junction Block Assembly Connector Terminal

   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
   3C-39 - Body ground	Ignition switch ON	4.5 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

3. Reconnect the 3C instrument panel junction block assembly connector.

NG → See step   13 

OK: Go to next step 

1. Check the vehicle specifications.
   RESULT
   
   

   Result	Proceed to
   w/ ABS	A
   w/o ABS	B

B → See step   20 

A: Go to next step 

1. Disconnect the 3A instrument panel junction block assembly connector.
   Fig 5: Identifying 3A Instrument Panel Junction Block Assembly Connector Terminal

   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
   3A-37 - Body ground	Ignition switch ON	4.5 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

3. Reconnect the 3A instrument panel junction block assembly connector.

NG → See step   14 

OK → See step   21 

1. Disconnect the 3C instrument panel junction block assembly connector.
2. Disconnect the A72 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3C-39 - A72-44 (SPD)	Always	Below 1 Ω
   3C-39 - Body ground	Always	10 kΩ or higher

4. Reconnect the 3C instrument panel junction block assembly connector.
5. Reconnect the A72 ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   22 

1. Disconnect the 3A instrument panel junction block assembly connector.
2. Disconnect the D104 power steering ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3A-37 - D104-2 (SPD)	Always	Below 1 Ω
   3A-37 - Body ground	Always	10 kΩ or higher

4. Reconnect the 3A instrument panel junction block assembly connector.
5. Reconnect the D104 power steering ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   23