Vehicle Speed Signal Circuit between Navigation ECU and Combination Meter: Procedure

1. Disconnect the N3 ECU connector.
   Fig 1: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the C8 meter connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance

   Tester Connection	Specified Condition
   N3-5 (SPD) - C8-21 (+S)	Below 1 Ω
   N3-5 (SPD) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

1. Move the shift lever to N.
   Fig 2: Identifying Connector Terminals & Voltage Pulses

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Jack up either of the rear wheels.
3. Measure the voltage of the meter connector.

   Standard

   Tester Connection	Condition	Specified Condition
   C8-21 (+S) - Body ground	Ignition switch ON, rear wheels is turned slowly	Voltage pulses as shown in Fig 2

NG → GO TO COMBINATION METER SYSTEM 

OK → REPLACE NAVIGATION ECU