Inspection Procedure

1. Run the engine and check if the function of the tachometer in the combination meter is normal.

   OK: Actual engine revolution speed and the revolution indicated on the tachometer are the same. 

OK:  Go to step  3

NG: Go to Next Step 

1. Delete the DTC (See DTC CHECK / CLEAR  ).
2. Check for the CAN communication system DTC U0146.

   HINT:

   If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first (See DIAGNOSTIC TROUBLE CODE CHART ).

   OK: No DTC is output. 

NG:  GO TO CAN COMMUNICATION SYSTEM

OK:  GO TO COMBINATION METER SYSTEM

1. Disconnect the A10 ECM connector.
   Fig 1: Identifying A10 ECM And E59 ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E59 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   E59-8 (TACH) - A10-15 (TACH)	Always	Below 1 Ω
   E59-8 (TACH) or A10-15 (TACH) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Reconnect the connectors.
2. Connect Techstream to the DLC3.
3. Check the DATA LIST for proper functioning of the engine.

   HINT:

   When using Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the tester and vehicle starts.

   Main Body: 

   DIAGNOSTIC NOTE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Engine Condition	Engine condition/STOP or RUN	STOP. Engine is stopped RUN. Engine is running	-

   OK: STOP (engine is stopped) and RUN (engine is running) appear on the screen. 

NG: REPLACE ECM 

OK: REPLACE MAIN BODY ECU