Component Inspection

Air Conditioner
B1203 Water temp sensor short (Low) - Inspection/Repair:_:Component Inspection

Component Inspection

1. Check WATER TEMP Sensor
(1) Ignition "OFF".
(2) Disconnect water temp. sensor.
(3) Measure resistance between terminal "1" and "2" of water temp. sensor.
A. Specification : Refer the specifications in fig3)








(4) Is the measured resistance within specifications in fig3)? (tolerance limits ±3%)
YES
1) Go to "Check A/C Control Unit" 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 Control Unit
(1) Engine "ON".
(2) Disconnect water temp. sensor.
(3) Measure Voltage between terminal "14" of A/C Control Unit and chassis ground.
A. Specification : Approx. 5V




(4) Is the measured voltage within specifications?
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 Control Unit and check for proper operation.
If the problem is corrected, replace A/C Control Unit and then go to "Verification of Vehicle Repair" procedure.