Vehicle Speed Signal Circuit: Procedure

1. Disconnect the No. 3 junction block connector.
   Fig 1: Locating No. 3 Junction Block Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	No. 3 Junction Block	-	-
   *a	Front view of wire harness connector (to No. 3 Junction Block)	-	-

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   3A-53 - Body ground	Power switch on (IG)	4.5 to 14 V
   3A-65 - Body ground
   3A-77 - Body ground

NG → See step   8 

OK: Go to next step 

1. Disconnect the No. 3 junction block connector.
   Fig 2: Locating No. 3 Junction Block Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	No. 3 Junction Block	-	-
   *a	Front view of wire harness connector (to No. 3 Junction Block)	-	-

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   3B-5 - Body ground	Power switch on (IG)	4.5 to 14 V
   3B-53 - Body ground
   3B-65 - Body ground

NG → See step   12 

OK: Go to next step 

1. Disconnect the combination meter assembly connector.
   Fig 3: Combination Meter Assembly Connector End View

   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
   E19-39 (+S) - Body ground	Power switch on (IG)	4.5 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   6 

OK: Go to next step 

1. Disconnect the brake booster with master cylinder assembly (skid control ECU) connector.
   Fig 4: Combination Meter Assembly Connector End View

   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
   A19-11 (SP1) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Brake Booster with Master Cylinder Assembly [Skid Control ECU])

NG → See step   7 

OK: Go to next step 

1. Remove the combination meter assembly with the connector(s) still connected. Refer to REMOVAL .
   Fig 5: Combination Meter Assembly Speed Signal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect an oscilloscope to terminal E19-38 (SI) and body ground.
3. Check the signal waveform according to the condition(s) in the table below.
   MEASUREMENT CONDITION
   
   

   Item	Condition
   Tester Connection	E19-38 (SI) - Body ground
   Tool Setting	5 V/DIV., 20 ms/DIV.
   Vehicle Condition	Driving at approximately 20 km/h (12 mph)

   OK

   The waveform displayed is as shown in the illustration.

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Combination Meter Assembly)

   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   18 

OK → See step   16 

1. Disconnect the E19 combination meter assembly connector.
2. Disconnect the 3A No. 3 junction block connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E19-39 (+S) - 3A-17	Always	Below 1 Ω
   E19-39 (+S) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE NO. 3 JUNCTION BLOCK 

1. Disconnect the E19 combination meter assembly connector.
2. Disconnect the A19 brake booster with master cylinder assembly (skid control ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E19-38 (SI) - A19-11 (SP1)	Always	Below 1 Ω
   E19-38 (SI) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   16 

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

   Tester Connection	ECU that Uses the Circuit	Proceed to
   3A-53 - Body ground	Telematics transceiver (DCM)	A
   3A-65 - Body ground	Tire pressure warning ECU	B
   3A-77 - Body ground	Power management control ECU	C

B → See step   10 

C → See step   11 

A: Go to next step 

1. Disconnect the 3A No. 3 junction block connector.
2. Disconnect the E122 telematics transceiver (DCM) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3A-53 - E122-10 (SPDP)	Always	Below 1 Ω
   3A-53 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   20 

1. Disconnect the 3A No. 3 junction block connector.
2. Disconnect the E56 tire pressure warning ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3A-65 - E56-2 (SPD)	Always	Below 1 Ω
   3A-65 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   19 

1. Disconnect the 3A No. 3 junction block connector.
2. Disconnect the E117 power management control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3A-77 - E117-14 (SPDI)	Always	Below 1 Ω
   3A-77 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   17 

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

   Tester Connection	ECU that Uses the Circuit	Proceed to
   3B-5 - Body ground	Vehicle approaching speaker controller	A
   3B-53 - Body ground	Navigation receiver assembly	B
   3B-65 - Body ground	Main body ECU (Instrument panel junction block assembly)	C

B → See step   14 

C → See step   15 

A: Go to next step 

1. Disconnect the 3B No. 3 junction block connector.
2. Disconnect the E113 vehicle approaching speaker controller connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3B-5 - E113-6 (SPD)	Always	Below 1 Ω
   3B-5 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   21 

1. Disconnect the 3B No. 3 junction block connector.
2. Disconnect the E119 navigation receiver assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3B-53 - E119-17 (SPD)	Always	Below 1 Ω
   3B-53 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   22 

1. Disconnect the 3B No. 3 junction block connector.
2. Disconnect the IC main body ECU (instrument panel junction block assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3B-65 - IC-8 (SPD)	Always	Below 1 Ω
   3B-65 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)