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(3) Connect the high side manifold gauge set to the fitting on the liquid line high side refrigerant (4) Compare the DRBIII t pressure value to the manifold gauge set reading. The pressure reading t should be similar to the reading of the manifold gauge set value. (5) If not, replace the a/c pressure transducer. REMOVAL (1) Disconnect and isolate the battery negative cable. (2) Unplug the wire harness connector from the A/C pressure transducer, which is mounted to a fit- (3) Unscrew the A/C pressure transducer from the discharge line fitting. (4) Remove the A/C pressure transducer from the vehicle. (5) Remove the O-ring seal from the discharge line fitting and discard. INSTALLATION (1) Lubricate a new O-ring seal with clean refrig- erant oil and install it on the discharge line fitting. (2) Install and tighten the A/C pressure transducer on the discharge line fitting. (3) Plug the wire harness connector into the A/C pressure transducer. (4) Connect the battery negative cable. AMBIENT TEMP SENSOR DESCRIPTION Ambient air temperature is monitored by the com- pass mini-trip computer module through the ambient For complete circuit diagrams (Refer to 8 - ELEC- TRICAL/WIRING DIAGRAM INFORMATION - DIAGNOSIS AND TESTING). The ambient tempera- OPERATION The ambient temperature sensor is a variable resistor that operates on a five-volt reference signal sent to it by the HVAC control head unit. The resis- DIAGNOSIS AND TESTING - AMBIENT The thermometer function is supported by the ambient temperature sensor, a wiring circuit, and a The ambient temperature sensor circuit can also be diagnosed using the following Sensor Test, and Sen- SENSOR TEST (1) Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. (2) Measure the resistance of the ambient temper- ature sensor. At - 40° C (- 40° F), the sensor resis- SENSOR CIRCUIT TEST (1) Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. (2) Connect a jumper wire between the two termi- nals in the body half of the ambient temperature sen- (3) Check for continuity between the sensor return circuit and the ambient temperature sensor signal 24 - 18 CONTROLS AN A/C PRESSURE TRANSDUCER (Continued) |