Component Inspection

Air Conditioner

B1241 Evaporator sensor short (Low) - Component Inspection

Component Inspection

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








FIG.1) ** Resistance value of evaporator sensor as a function of temperature.
4. Is "resistance" display near the specified value?
YES
1) Go to "Check A/C-ECU" procedure.
NO
1) Substitute with a known-good Evaporator sensor and check for proper operation. If the problem is corrected, replace Evaporator sensor and then go to "Verification of Vehicle Repair" procedure.
Check A/C-ECU
1. Ignition "OFF"
2. A/C-ECU : Connect, Evaporator sensor : Disconnect.
3. Ignition "ON"(ENGINE "OFF").
4. Measure voltage between Signal (+) terminal of Evaporator sensor harness 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.