Component Inspection

Air Conditioner

B1203 Water temp sensor short (Low) - Component Inspection

Component Inspection

1. Check Water temp. sensor
(1) Ignition "OFF"
(2) A/C-ECU, Water temp. sensor : Connect.
(3) Measure resistance between Signal (+) terminal of Water temp. sensor harness connector and and Sensor ground terminal of Water temp. sensor harness connector. (Component side)
A. Specification : Refer the specifications in fig.1








(4) Is "resistance" display near the specified value?
YES
1) Go to "Check A/C-ECU" procedure.
NO
1) Substitute with a known-good Water temp. sensor and check for proper operation. If the problem is corrected, replace Water temp. sensor and then go to "Verification of Vehicle Repair" procedure.
2. Check A/C-ECU
(1) Ignition "OFF"
(2) A/C-ECU : Connect, Water temp. sensor : Disconnect.
(3) Ignition "ON"(ENGINE "OFF").
(4) Measure voltage between Signal (+) terminal of Water temp. sensor connector and and chassis ground. (Component side)
A. Specification : Approx. 5 V




(5) Is "voltage" display near the specified value?
YES
1) Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Substitute with a known-good A/C-ECU and check for proper operation. If the problem is corrected, replace A/C-ECU and then go to "Verification of Vehicle Repair" procedure.