Voltage at 0 C 32 F 28 32 V at 40 C 104 F 18 22 V at 70 C 158 F 13 15 V HINT As

Voltage at 0 c 32 f 28 32 v at 40 c 104 f 18 22 v at

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Voltage: at 0 _ C (32 _ F) : 2.8 ~ 3.2 V at 40 _ C (104 _ F) : 1.8 ~ 2.2 V at 70 _ C (158 _ F) : 1.3 ~ 1.5 V HINT: As the temperature increases, the voltage de- creases. Proceed to next circuit inspection shown on matrix chart (See page AC–26 ). However, if Diagnostic trouble code 14 is displayed, check and replace A/C control assembly. 2 Check engine coolant temperature sensor. C OK P 1. Remove heater unit (See page AC–83 ). 2. Remove engine coolant temperature sensor. Measure resistance between terminals 1 and 3 of en- gine coolant temperature sensor connector at each temperature. Resistance: at 0 _ C (32 _ F) : 16.5 ~ 17.5 k W at 40 _ C (104 _ F) : 2.4 ~ 2.8 k W at 70 _ C (158 _ F) : 0.7 ~ 1.0 k W HINT: As the temperature increases, the resistance decreases. Replace engine coolant temperature sensor. 3 Check harness and connector between air conditioning control assembly and engine coolant temperature sensor (See page IN–29 ). Repair or replace harness or connector. Check and replace A/C control assembly. AIR CONDITIONING SYSTEM TROUBLESHOOTING AC–35
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DTC 21 Solar Sensor Circuit CIRCUIT DESCRIPTION A photo diode in the solar sensor detects solar radiation and sends signals to the air condition- ing control assembly. DTC No. DTC Detecting Condition Trouble Area 21 Open or short in solar sensor circuit. (Please note that display of diagnostic trouble code 21 is not abnormal when the sensor is not receiving solar radiation.) S Solar sensor. S Harness or connector between solar sensor and A/C control assembly. S A/C control assembly. WIRING DIAGRAM AC–36 AIR CONDITIONING SYSTEM TROUBLESHOOTING
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NG OK OK NG OK NG INSPECTION PROCEDURE 1 Check voltage between terminals SG and TS of air conditioning control assembly connector. C OK P Remove air conditioning control assembly with connec- tors still connected. 1. Turn ignition switch ON. 2. Measure voltage between terminals SG and TS of air conditioning control assembly connector when the solar sensor is subjected to an electric light, and when the sensor is covered by a cloth. HINT: As the inspection light is moved away from the sensor, the voltage increases. Proceed to next circuit inspection shown on matrix chart (See page AC–26 ). However, if Diagnostic trouble code 21 is displayed, check and replace A/C control assembly. 2 Check solar sensor. C OK P Hint P OK Hint 1. Remove glove compartment assembly. 2. Remove solar sensor. 1. Cover the sensor by a cloth. 2. Measure resistance between terminals 1 and 2 of solar sensor connector. Connect positive Ī lead of ohmmeter to terminal 1 and negative lead to terminal 2 of the solar sensor. Resistance: R W (no continuity) 1. Remove the cloth from the solar sensor and subject the sensor to electric light. 2. Measure resistance. Resistance: Approx. 4 k W (continuity) As the electric light is moved away from the sensor, the resistance increases. Replace solar sensor.
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