Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISELECTRICALGAUGESCOMBINATION METERINSPECTION

2004 Toyota Celica GT, Standard

Combination Meter: Inspection

2004 Toyota Celica GT, StandardSECTION Inspection

INSPECT SPEEDOMETER ON-VEHICLE

Using a speedometer tester, inspect the speedometer and check the operation of the odometer.

HINT:

Tire wear and tire over or under inflation will increase the indication error.

If error is excessive, replace the speedometer.

STANDARD INDICATION ALLOWABLE RANGE CHART

USA (mph)	CANADA (km/h)
Standard indication Allowable range	Standard indication Allowable range
20 19- 22	20 18 - 23
40 39 - 42.5	40 40 - 44
60 59.5 - 63.5	60 60 - 64.5
80 80 - 85	80 80 - 85
100 100 - 105.5	100 100 - 105
120 120 - 125.5	120 120 - 125.5
	140 140 - 146
	160 160 - 167

Fig 1: Inspecting Speedometer On-Vehicle

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT SPEEDOMETER RESISTANCE

Measure the resistance between terminals with fixing pointer to the stopper.

MEASURE RESISTANCE BETWEEN TERMINALS CHART

Tester connection	Resistance Ω
A - B	250
C - D	250

If resistance value is not as specified, replace the meter.

INSPECT VEHICLE SPEED SENSOR OPERATION
1. Connect the battery positive (+) lead to terminal 1 and the battery negative (-) lead to terminal 2.
2. Connect the tester positive (+) lead to terminal 3 and the tester negative (-) lead to terminal 2.
3. Rotate the shaft.
4. Check that there is voltage change from approx. 0 V to 11 V between terminals 2 and 3.
  
  Fig 2: Inspecting Vehicle Speed Sensor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:

The voltage change should be 4 times for every revolution of the speed sensor shaft.

If operation is not as specified, replace the sensor.

INSPECT TACHOMETER ON-VEHICLE

Connect a tune-up test tachometer, and start the engine.
NOTE: Reversing the connection of the tachometer will damage the transistors and the diodes inside.

Compare the tester indications with the tachometer indications.

RPM STANDARD CHART

Standard indication	Allowable range
700	700 - 770
1,000	900 - 1,100
2,000	1,850 - 2,150
3,000	2,800 - 3,200
4,000	3,800 - 4,200
5,000	4,800 - 5,200
6,000	5,800 - 6,200
7,000	6,800 - 7,200

If error is excessive, replace the tachometer.

INSPECT TACHOMETER RESISTANCE

Measure the resistance between terminals with fixing the pointer to the stopper.

RESISTANCE TERMINALS WITH FIXING POINTER CHART

Tester connection	Resistance Ω
A - B	250
C - D	250

If resistance value is not as specified, replace the meter.

Fig 3: Inspecting Tachometer Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT FUEL RECEIVER GAUGE OPERATION
1. Disconnect the connector from the sender gauge assembly.
2. Turn the ignition switch ON, check that the receiver gauge needle indicates EMPTY.
  
  Fig 4: Inspecting Fuel Receiver Gauge
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Connect terminal 2 and 3 of the wire harness side connector through a 3.4 W test bulb.
4. Turn the ignition switch ON, check that the bulb lights up and receiver gauge needle moves upper side.
If operation is not as specified, inspect the fuel receiver gauge resistance.

Fig 5: Connecting Terminal And Of Wire Harness Side Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT FUEL SENDER GAUGE RESISTANCE

Measure the resistance between terminals 2 and 3 for each float position.

Fig 6: Inspecting Fuel Sender Gauge Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEMPERATURE RESISTANCE CHART

Float position: mm (in.)	Resistance (Ω)
F: Approx. 75.9 (2.99)	Approx. 3.0
1/2: Approx. 17.2 (0.68)	Approx. 31.6
E: Approx. 50.8 (2.00)	Approx. 110.0

If resistance value is not as specified, replace the sender gauge.

INSPECT ENGINE COOLANT TEMPERATURE RECEIVER GAUGE OPERATION
1. Disconnect the connector from the sender gauge.
2. Turn the ignition switch ON, then check that the receiver gauge needle indicates COOL.
  
  Fig 7: Inspecting Engine Coolant Temperature Receiver Gauge Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Ground the terminal of the wire harness side connector through a 3.4 W test bulb.
4. Turn the ignition switch ON, check that the bulb lights up and the receiver gauge needle moves toward the hot side.
If operation is not as specified, inspect the sender gauge. Then recheck the system.

Fig 8: Connecting Terminal Of Wire Harness Side Connector Through A 3.4 W Test Bulb
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT ENGINE COOLANT TEMPERATURE SENDER GAUGE RESISTANCE

Connect the wire harness as shown in the illustration, and adjust the ammeter pointer to indicate "0" using the slide rheostat, then read the rheostat indication.

FLOAT POSITION CHART

Temperature °C (°F)	Resistance (Ω)
50(122.0)	160 - 240
120(248.0)	17.1 - 21.2

If resistance value is not as specified, replace the engine coolant temperature sender gauge.

Fig 9: Inspecting Engine Coolant Temperature Sender Gauge Resistance

INSPECT LOW OIL PRESSURE WARNING LIGHT
1. Disconnect the connector from the warning switch and the ground terminal of the wire harness side connector.
2. Turn the ignition switch ON, check that the warning light comes on.
If the warning light does not come on, test the bulb or inspect the wire harness.

Fig 10: Inspecting Low Oil Pressure Warning Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT LOW OIL PRESSURE SWITCH CONTINUITY
1. Check that there is a continuity between terminal and ground with the engine stopped.
2. Check that there is no continuity between terminal and ground with the engine running.
HINT:

Oil pressure should be over 24.5 kPa (0.25 kgf/cm² , 3.55 psi). If operation is not as specified, replace the switch.

Fig 11: Inspecting Low Oil Pressure Switch Continuity
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT BRAKE WARNING SYSTEM LIGHT
1. Disconnect the connector from the brake fluid level warning switch.
2. Connect terminals on the wire harness side of the level warning switch connector.
3. Start the engine, then check that the brake warning light comes on.
If the warning light does not come on, test the bulb or wire harness.

Fig 12: Inspecting Brake Warning System Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT BRAKE FLUID LEVEL WARNING SWITCH CONTINUITY
1. Remove the reservoir tank cap and the strainer.
2. Disconnect the connector.
3. Check that there is no continuity between terminals with the switch OFF (float up).
4. Use a syphon, etc. to take fluid out of the reservoir tank.
5. Check that there is a continuity between terminals with the switch ON (float down).
6. Pour the fluid back in the reservoir tank.
  If operation is not as specified, replace the switch.
  
  Fig 13: Inspecting Brake Fluid Level Warning Switch Continuity
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT PARKING BRAKE WARNING LIGHT
1. Disconnect the connector from the parking brake switch.
2. Ground terminal of the wire harness side connector.
3. Start the engine and check that the warning light comes on.
If the warning light does not come on, test the bulb or inspect the wire harness.

Fig 14: Inspecting Parking Brake Warning Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT PARKING BRAKE SWITCH CONTINUITY
1. Check that there is a continuity between terminal and switch body with the switch ON (switch pin released).
2. Check that there is no continuity between terminal and switch body with the switch OFF (switch pin pushed in).
If operation is not as specified, replace the switch or inspect ground point.

Fig 15: Inspecting Parking Brake Switch Continuity
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT OPEN DOOR WARNING LIGHT
Disconnect the connector from the door courtesy switch and the ground terminal 1 of the wire harness side connector, and check that the warning light comes on.

If the warning light does not comes on, inspect the bulb or wire harness.

Fig 16: Inspecting Open Door Warning Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT LIGHT CONTROL RHEOSTAT OPERATION
Gradually turn the rheostat knob from the bright side to dark side and check that the resistance decreases from 10 kΩ to 0 Ω between terminal 2 and 1. (Turn the rheostat knob clockwise) If operation is not as specified, replace the rheostat light control.

Fig 17: Inspecting Light Control Rheostat Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002