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Pinpoint Test DY: Engine Oil Temperature (EOT) Sensor: Introduction: Notes

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NOTE: This pinpoint test is intended to diagnose the following:
  • Engine oil temperature (EOT) sensor (12A648).
  • Harness circuits: EOT & SIGRTN.
  • Powertrain control module (PCM) (12A650).

Engine oil temperature must be greater than 10°C (50°F) to pass the KOEO self-test and greater than 66°C (150°F) to pass the KOER self-test  .

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

Fig 1: Engine Oil Temperature (EOT) Sensor Temperature/Voltage Graph
G03626663Courtesy of FORD MOTOR CO.
TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS

Temperature Temperature Sensor Values
°C °F voltage Resistance (K ohms)
120 248 0.28 1.18
110 230 0.36 1.55
100 212 0.47 2.07
90 194 0.61 2.80
80 176 0.80 3.84
70 158 1.05 5.37
60 140 1.37 7.70
50 122 1.77 10.97
40 104 2.23 16.15
30 86 2.74 24.27
20 68 3.26 37.30
10 50 3.73 58.75
0 32 4.14 95.85
-10 14 4.45 160.31
Fig 2: Identifying Engine Oil Temperature (EOT) Sensor Connector
G03626664Courtesy of FORD MOTOR CO.
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