Inspection Procedure

1. Check that the tachometer can operate properly while the engine is idling.

   OK: Tachometer can operate properly while the engine is idling. 

OK: REPLACE COMBINATION METER ASSEMBLY 

NG: Go to next step. 

1. Disconnect the C8 meter connector.
   Fig 1: Identifying C8 Meter Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage and resistance of the wire harness side connector.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   C8-12 (+B) - Body ground	10 to 14 V

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   C8-11 (ES) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step. 

1. Disconnect the C8 meter connector.
2. Disconnect the G3 and S6 ECU connectors.
   Fig 2: Identifying C8 Meter Connector And G3 And S6 ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   C8-2 (MPX+) - G3-16 (MPI2)	Below 1 Ω
   C8-3 (MPX-) - S6-17 (MPX1)	Below 1 Ω

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   Both are OK	A
   One is OK	B
   Both are NG	C

B: REPLACE COMBINATION METER ASSEMBLY AND REPAIR OR REPLACE HARNESS AND CONNECTOR 

C: REPAIR OR REPLACE HARNESS AND CONNECTOR 

A: REPLACE COMBINATION METER ASSEMBLY