H3 COMPARE THE EVAPORATOR TEMPERATURE SENSOR TO THE PCM (POWERTRAIN CONTROL MODULE) AMBIENT AIR TEMPERATURE (AAT) PID (PARAMETER IDENTIFICATION)
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C296-1 (component side) | C296-2 (component side) |
Compare the resistance values to the table below:
Ambient Temperature °F (°C) | Resistance ohms |
-39.9°F (-40°C) | 98,625 - 103,275 ohms |
-4.0°F (-20°C) | 28,640 - 29,600 ohms |
32.0°F (°C) | 9695 - 9895 ohms |
68.0°F (20°C) | 3675 - 3810 ohms |
77.0°F (25°C) | 2950 - 3050 ohms |
86.0°F (30°C) | 2370 - 2565 ohms |
103.9°F (40°C) | 1565 - 1635 ohms |
Ignition ON. Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs). Monitor the AAT PID.
Is the resistance within the specified values for the temperatures?
Yes | GO to H4 | |
|---|---|---|
No | INSTALL a new evaporator temperature sensor. REFER to: Evaporator Temperature Sensor (412-00 Climate Control System - General Information, Removal and Installation). | |
H4 CHECK THE FCIM (FRONT CONTROLS INTERFACE MODULE) A/C (AIR CONDITIONING) SWITCH STATUS (CC_SW_AC) PID (PARAMETER IDENTIFICATION)
Ignition ON. Using a diagnostic scan tool, view FCIM Parameter Identifications (PIDs). Monitor the CC_SW_AC PID. Select panel mode, press and release the A/C button (indicator off) on the FCIM controls.
Does the PID display Active when pressed and Inactive when released?
Yes | GO to H5 | |
|---|---|---|
No | GO to H8 | |
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.