Inspection Procedure

1. Remove the clock assy with the connector still connected.
2. Turn the ignition switch to ON.
3. Measure the voltage between terminal 9 (TAUB) of the clock assy connector and body ground.

   Standard: 10 to 14 V 

4. Turn the ignition switch to ON.
5. Measure the voltage between terminal 7 (TAU) of the clock assy connector and body ground.

   Standard: 10 to 14 V 

   Fig 1: Identifying Clock Assy Connector Terminals

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6. Connect the oscilloscope to terminals 1 (GND) and 7 (TAU) of the clock assy connector.
7. Start the engine.
8. Check the signal wave form (TAU signal).
   CLOCK ASSY - REFERENCE TABLE
   
   

   Item	Condition
   Tool setting	10 V/DIV, 100 ms/DV
   Vehicle condition	Engine idle speed

   Fig 2: Identifying Signal Wave Form Graph

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9. Jack up either of the front wheels.
10. Shift the shift lever to neutral.
11. Turn the ignition switch to ON.
12. Measure the voltage between terminal 15 (SPD) of the clock assy and body ground when the front wheel is turned slowly.
    Fig 3: Identifying Clock Assy Connector Terminal SPD

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    OK: 

    Voltage is generated intermittently. 

Fig 4: Identifying Voltage Graph

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Result: 

B: GO TO FUEL SYSTEM (See  HOW TO PROCEED WITH TROUBLESHOOTING  (2AZ-FE),  HOW TO PROCEED WITH TROUBLESHOOTING  (2AZ-FE(PZEV)),  HOW TO PROCEED WITH TROUBLESHOOTING  (1MZ-FE/3MZ-FE)) 

C: Go to step 2 

D: Go to step 3 

A: REPLACE CLOCK ASSY (See step 4 on  REPLACEMENT  ) 

1. Check that continuity exists in the IGN fuse.

   NG: REPLACE FUSE 

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the combination meter assy with the connectors still connected.
2. Jack up either of the front wheels.
3. Shift the shift lever to neutral.
4. Turn the ignition switch to ON.
5. Measure the voltage between terminal C7-36 of the combination meter assy and body ground when the front wheel is turned slowly.
   Fig 5: Identifying Combination Meter Assy Connector Terminal C7-36

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   OK: 

   Voltage is generated intermittently. 

Fig 6: Identifying Voltage Graph

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

NG: REPLACE COMBINATION METER ASSY (SEE  OVERHAUL  ) 

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR