Pinpoint Test FB: Ambient Air Temperature (AAT): Introduction

WARNING: TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.

This pinpoint test is intended to diagnose the following:

ambient air temperature (AAT) sensor
harness circuits: AAT and SIGRTN
powertrain control module (PCM) (12A650)

Fig 1: Identifying Ambient Air Temperature Sensor Connector Terminals
Courtesy of FORD MOTOR CO.

Pin	Circuit
2	SIGRTN (Signal Return)
1	AAT (Ambient Air Temperature)

Fig 2: Identifying Right Exterior Rear View Mirror Assembly Connector Terminals

Courtesy of FORD MOTOR CO.

Pin	Circuit
10	SIGRTN (Signal Return)
9	AAT (Ambient Air Temperature)

Fig 3: Identifying Powertrain Control Module Connector Terminals

Courtesy of FORD MOTOR CO.

Pin	Circuit
B45	SIGRTN (Signal Return)
B33	AAT (Ambient Air Temperature)