Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CLOCK ASSY (FUEL, TAU, TAUB, SPD)

Remove the clock assy with connector still connected.

Check voltage (FUEL signal).

Measure voltage between terminal 5 (FUEL) of clock assy and body ground.

Standard voltage:

STANDARD VOLTAGE

Fuel Level	Voltage (V)
F	4.4 +/- 0.1
E	0.6 +/- 0.1

Fig 1: Identifying Clock Assy (Fuel, TAU, TAUB, SPD)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check voltage (TAUB signal).
1. Turn the ignition switch to ON.
2. Measure the voltage between terminal 9 (TAUB) of clock assy connector and body ground.
Standard voltage: 10 - 14 V
Check voltage (TAU signal).
1. Turn the ignition switch to ON.
2. Measure the voltage between terminal 7 (TAU) of clock assy connector and body ground.
Standard voltage: 10 - 14 V

Check signal waveform (TAU signal).

Connect the oscilloscope to the terminals 1 (GND) and 7 (TAU) of clock assy connector.
Start engine.
Check the signal waveform.

WAVEFORM REFERENCE

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

Fig 2: Injector Signal & Magnification Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check voltage (SPD signal).
1. Jack up either of the front wheels.
2. Shift the shift lever to neutral.
3. Turn the ignition switch to ON.
4. Measure the voltage between terminal 15 (SPD) of clock assy and body ground when front wheel is turning slowly.
  
  Fig 3: Identifying Clock Assy Connector Terminal (SPD)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard voltage:

Voltage is generated intermittently.

Fig 4: Standard Voltage Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result:

RESULT

A	OK
B	TAU signal: NG
C	FUEL signal: NG
D	TAUB signal: NG
E	SPD signal: NG

B: GO TO FUEL SYSTEM
C: Go to step 2
D: Go to step 3
E: Go to step 4
A: CHECK AND REPLACE CLOCK ASSY

CHECK COMBINATION METER ASSY

Remove the combination meter assy with connectors still connected.

Check voltage (FUEL signal).

Measure voltage between terminal C8-17 (FUEL) of combination meter assy and body ground.

Standard voltage:

STANDARD VOLTAGE

Fuel Level	Voltage (V)
F	4.4 +/- 0.1
E	0.6 +/- 0.1

Fig 5: Identifying Combination Meter Connector Terminal C7-36

NG: CHECK AND REPLACE COMBINATION METER ASSY
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT FUSE (IGN)
1. Check the continuity in IGN fuse.
1. NG: REPLACE FUSE
2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK COMBINATION METER ASSY
1. Remove the combination meter assy with connectors still connected.
2. Check voltage.
  1. Jack up either of the front wheels.
  2. Shift the shift lever to neutral.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between terminal C7-36 of combination meter assy and body ground when front wheel is turning slowly.
    
    Fig 6: Identifying Combination Meter Connector Terminal C7-36
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  Standard voltage:
  
  Voltage is generated intermittently.
  
  Fig 7: Standard Voltage Waveform
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: CHECK AND REPLACE COMBINATION METER ASSY
2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR