Multi-Display Power Source Circuit: Procedure

1. Remove the combination meter assembly.
   Fig 1: Identifying C11 Combination Meter Assembly (TAU-B) Connector Terminals

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

   Standard voltage

   Tester connection	Condition	Specified condition
   C11-2 (TAU-B INPUT) - Body ground	Ignition switch ON	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check the input signal waveform.
   Fig 2: Identifying C11 Combination Meter Assembly (TAU-G) Connector Terminals

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   1. Remove the combination meter assembly.
   2. Connect the oscilloscope to terminal C11-3 (TAU-G INPUT) and body ground.
   3. Start the engine.
   4. Check the signal waveform according to the condition(s) in the table below.
      Fig 3: Identifying Signal Waveform Graph

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      WAVEFORM:
      
      

      Item	Condition
      Tool setting	10 V/DIV., 20 ms/DIV.
      Vehicle condition	Engine idle speed

      HINT: 

      As the engine speed goes higher, the frequency becomes shorter.

NG → GO TO ENGINE CONTROL SYSTEM 

OK → REPLACE COMBINATION METER ASSEMBLY