Inspection Procedure

1. Remove the combination meter assy.
2. Check voltage (TAUB signal).
   1. Turn the ignition switch to ON.
   2. Measure the voltage between terminal C11-2 of combination meter connector and body ground.

   Standard voltage: 10 - 14 V 

   Fig 1: Measuring Voltage Between Terminal C11-2 And Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check voltage (TAU signal).
   1. Turn the ignition switch to ON.
   2. Measure the voltage between terminal C11-3 of combination meter connector and body ground.

   Standard voltage: 10 - 14 V 

4. Check signal waveform (TAU signal).
   1. Connect the oscilloscope to the terminals C11-3 of combination meter connector and body ground.
   2. Start engine.
   3. Check the signal waveform.
   Fig 2: Checking Signal Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result: 

1. B: GO TO ENGINE CONTROL SYSTEM (See  BASIC DIAGNOSTIC PROCEDURES  ) 
2. C: CHECK AND REPLACE COMBINATION METER ASSY 
3. A: GO TO NEXT STEP 

1. Check the continuity in AM2 fuse.

1. NG: REPLACE FUSE 
2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR