Water Temperature Sensor (Service Code 14)
Turn the ignition switch OFF.
If the reading is within the standard, check the ECU for
its ground, and power supply (see ECU Power Supply
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
If the reading is out of the standard, remove the ECU
and check the wiring for continuity between main harness
Special Tool - Hand Tester: 57001-1394
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Water Temperature Sensor Connector [B]
O lead (ECU terminal 53) [C]
BR/Y lead (ECU terminal 55) [D]
If the wiring is good, check the water temperature sensor
resistance (see Water Temperature Sensor Resistance
Water Temperature Sensor Resistance Inspection
Refer to the Water Temperature Sensor Inspection in the
Electrical System chapter.
If the reading is within the standard, but the problem still
exists, replace the ECU (see ECU Removal/Installation).
Water Temperature Sensor Circuit
2. Water Temperature Sensor
FUEL SYSTEM (DFI) 3-55