Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Perform this test only when directed by QUICK TEST. This test is intended to diagnose the following:

Air Conditioning Evaporative Temperature (ACET) Sensor
Wiring Harness Circuits (ACET & SIG RTN)
Powertrain Control Module (PCM)

DTC P1437 is set when ACET signal is more than self-test maximum of 4.5 volts. DTC P1436 is set when ACET signal is less than self-test minimum of .13 volt.

NOTE: ACET sensor may also be referred to as an Evaporator Air Discharge Temperature (EADT) sensor.

ACET SENSOR SPECIFICATIONS ⁽¹⁾

Temperature °F (°C)

Volts

Ohms

-4 (-20)

4.66

276,960

14 (-10)

4.45

160,310

32 (0)

4.14

95,850

50 (10)

3.73

58,990

68 (20)

3.26

37,340

86 (30)

2.74

24,250

104 (40)

2.23

16,110

122 (50)

1.77

10,930

140 (60)

1.37

7550

158 (70)

1.05

5340

176 (80)

.80

3840

194 (90)

.61

2800

212 (100)

.47

2080

⁽¹⁾	Value may vary by 15 percent due to sensor and VREF variations. Voltage values are calculated for 5.0 volts VREF.

Fig 1: Identifying ACET Sensor Circuits & Connector Terminals (Sable & Taurus)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying ACET Sensor Circuits & Connector Terminals (All Other)

Courtesy of FORD MOTOR CO.