Malfunction in Water Temperature Receiver Gauge: Wiring Diagram

Fig 1: Malfunction In Water Temperature Receiver Gauge - Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If there is an open or short in the engine coolant temperature sensor circuit, an SFI system DTC is output. If output, perform troubleshooting on the SFI system first.

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Operate the intelligent tester according to the display and select the "Active Test".

Combination meter

COMBINATION METER SPECIFICATION

Item	Test Details	Diagnostic Note
COOLANT TEMP	LOW / NORMAL / HI	-

OK : Needle indication is normal.

NG : REPLACE COMBINATION METER

OK : GO TO NEXT STEP

READ VALUE OF INTELLIGENT TESTER

Operate the intelligent tester according to the display and select the "Data List".

ECM:

3GR-FSE

COOLANT TEMP SPECIFICATION

Item	Measurement Item/Range (Display)	Normal Condition	Diagnostic Note
COOLANT TEMP	Engine coolant Temperature/Min.: -40°C, Max.: 140°C	After warming up: 80 to 105°C (176 to 221°F)	If value is -40°C (-40°F), sensor circuit is open. If value is 140°C (284°F), sensor circuit is shorted.

OK : Coolant temperature displayed on the tester is between 80°C (176°F) and 105°C (221°F) after warming up.

ECM:

3UZ-FE

COOLANT TEMP SPECIFICATION (3UZ-FE)

Item	Measurement Item/Range (Display)	Normal Condition	Diagnostic Note
COOLANT TEMP	Engine coolant Temperature/Min.: -40°C, Max.: 140°C	After warming up: 75 to 95°C (167 to 203°F)	If value is -40°C (-40°F), sensor circuit is open. If value is 140°C (284°F), sensor circuit is shorted.

OK : Coolant temperature displayed on the tester is between 75°C (167°F) and 95°C (203°F) after warming up.

NG : GO TO ENGINE CONTROL SYSTEM

OK : GO TO NEXT STEP

REPLACE COMBINATION METER
OK : Operation of combination meter returns to normal.

NG : GO TO ENGINE CONTROL SYSTEM

OK : END