1999 PCED On Board Diagnostics II
SECTION 5: Pinpoint Tests
DA: Intake Air Temperature (IAT)/Engine Coolant Temperature (ECT)/Engine Oil Temperature (EOT) Sensors
Introduction
  DA: Pinpoint Tests  

Note

This Pinpoint Test is intended to diagnose the following:

The term "applicable" is used in this pinpoint test and refers to the temperature sensor indicated by the DTC. Example: ECTV, IATV, EOTV.

Tables and Graphs

Note: Engine coolant temperature must be greater than 10°C (50° F) to pass the KOEO Self-Test and greater than 82° C (180°F) to pass the KOER Self-Test. To accomplish this, the engine must be at normal operating temperature.

Ambient temperature must be above 10°C (50° F) to receive acceptable input from the intake air temperature (IAT) sensor.

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 were calculated for VREF = 5.0 volts. These values can vary 15 percent due to sensor and VREF variations.






 TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS

Temperature Temperature Sensor Values
°C °F Voltage (volts) Resistance (K ohms)
120 248 0.27 1.18
110 230 0.35 1.55
100 212 0.46 2.07
90 194 0.60 2.80
80 176 0.78 3.84
70 158 1.02 5.37
60 140 1.33 7.70
50 122 1.70 10.97
40 104 2.13 16.15
30 86 2.60 24.27
20 68 3.07 37.30
10 50 3.51 58.75

Pinpoint Test Schematics and Connectors

2.0L Contour/Mystique/Cougar (w/o returnless fuel system)



2.0L Contour/Mystique/Cougar (w/returnless fuel system)



LS6/LS8



All Others



Pinpoint Test Schematics and Connectors




LS6/LS8 (If equipped)






2.0L 4V Escort, 2.0L Contour/Mystique, Cougar (w/returnless fuel system), Windstar, 4.2L Econoline, Explorer

Note: On some applications the integrated IAT/MAF sensor connector is located inside the air cleaner assembly.




 

 

  DA: Pinpoint Tests