Inspection Procedure

1. Operate the intelligent tester according to the steps on the display and select the "ACTIVE TEST".

   METER: 

   METER REFERENCE
   
   

   Item	Test Details	Diagnostic Note
   TACHOMETER	0 rpm / 1,000 rpm / 2,000 rpm / 3,000 rpm / 4,000 rpm / 5,000 rpm / 6,000 rpm / 7,000 rpm	-

OK: 

Needle indication is normal. 

NG: REPLACE COMBINATION METER ASSEMBLY 

OK: GO TO NEXT STEP 

1. Operate the intelligent tester according to the steps on the display and select the "DATA LIST".

   METER: 

   METER REFERENCE
   
   

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   TACHO METER	Engine speed / min.: 0 rpm, Max.: 12,750 rpm	Almost same as actual engine speed (When engine is running)	-

OK: 

Engine speed displayed on the tester is almost the same as the actual engine speed. 

NG: Go to step 3 

OK: REPLACE COMBINATION METER ASSEMBLY 

1. Operate the intelligent tester according to the steps on the display and select the "DATA LIST".

   ENGINE: 

   ENGINE REFERENCE
   
   

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   ENGINE SPD	Engine speed / min.: 0 rpm, Max.: 16,383 rpm	Almost same as actual engine speed (When engine is running)	-

OK: 

Engine speed displayed on the tester is almost the same as the actual engine speed. 

NG: GO TO ENGINE CONTROL SYSTEM

OK: GO TO NEXT STEP 

1. Check the input signal waveform.
   1. Remove the combination meter assembly.
   2. Connect the oscilloscope to the terminals E2-14 (TACHO) and body ground.
   3. Start the engine.
      Fig 1: Connecting Oscilloscope To Terminals E2-14 (TACHO) And Body Ground

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   4. Check the signal waveform according to the condition(s) in the table below.
      SIGNAL WAVEFORM REFERENCE
      
      

      Item	Condition
      Tool setting	5 V/DIV., 10 ms/DIV.
      Vehicle condition	Engine idle speed

OK: 

The waveform is displayed as shown in  Fig 2 . 

Fig 2: Signal Waveform Graph

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Go to step 5 

OK: REPLACE COMBINATION METER ASSEMBLY 

1. Disconnect the E2 and D41 connectors.
2. Measure the resistance according to the value(s) in the table below.

   Resistance 

   RESISTANCE REFERENCE
   
   

   Tester connection (Symbols)	Condition	Specified Condition
   E2-14 (TACHO) - D41-1 (TACH)	Always	Below 1 Ω
   E2-14 (TACHO) - Body ground	Always	10 kΩ or higher

Fig 3: Disconnecting E2 And D41 Connectors

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO ENGINE CONTROL SYSTEM