Pinpoint Test DJ: Air Conditioning Evaporator Temperature (ACET) Sensor: Introduction

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This pinpoint test is intended to diagnose the following:

ACET sensor (19C734)
harness circuits: ACET and SIGRTN
powertrain control module (PCM) (12A650)

AIR CONDITIONING EVAPORATOR TEMPERATURE (ACET) SENSOR

°C	°F	Voltage	Resistance (K ohms)
100	212	0.47	2.08
90	194	0.61	2.8
80	176	0.80	3.84
70	158	1.05	5.34
60	140	1.37	7.55
50	122	1.77	10.93
40	104	2.23	16.11
30	86	2.74	24.25
20	68	3.26	37.34
10	50	3.73	58.99
0	32	4.14	95.85
-10	14	4.45	160.31
-20	-4	4.66	276.96

These values can vary by 15% due to sensor and VREF variations. Voltage values calculated for VREF are equal to 5 volts.

Fig 1: Air Conditioning Evaporator Temperature (ACET) Sensor Connector

Courtesy of FORD MOTOR CO.

For PCM connector views or reference values, refer to REFERENCE VALUES .

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR

Connector	Pin	Circuit
140 Pin	B33, E57 B58, E58 B53	VREF SIGRTN ACET