Electrical Specifications

COOLANT TEMPERATURE SENSOR (CTS)


212°F or (100°C) 177 Ohms

194°F or (90°C) 241 Ohms

176°F or (80°C) 332 Ohms

158°F or (70°C) 467 Ohms

140°F or (60°C) 667 Ohms

122°F or (50°C) 973 Ohms

113°F or (45°C) 1188 Ohms

104°F or (40°C) 1459 Ohms

95°F or (35°C) 1802 Ohms

86°F or (30°C) 2238 Ohms

77°F or (25°C) 2796 Ohms

68°F or (20°C) 3520 Ohms

59°F or (15°C) 4450 Ohms

50°F or (10°C) 5670 Ohms

41°F or (5°C) 7280 Ohms

32°F or (0°C) 9420 Ohms

23°F or (-5°C) 12,300 Ohms

14°F or (-10°C) 16,180 Ohms

5°F or (-15°C) 21,450 Ohms

-4°F or (-20°C) 28,680 Ohms

-22°F or (-30°C) 52,700 Ohms

-40°F or (-40°C) 100,700 Ohms



MANIFOLD ABSOLUTE PRESSURE SENSOR (MAP)



1,000 to 2,000 Feet [1] 3.6 to 5.3 Volts

2,000 to 3,000 Feet [1] 3.5 to 5.1 Volts

3,000 to 4,000 Feet [1] 3.3 to 5.0 Volts

4,000 to 5,000 Feet [1] 3.2 to 4.8 Volts

5,000 to 6,000 Feet [1] 3.0 to 4.6 Volts

6,000 to 7,000 Feet [1] 2.9 to 4.5 Volts

7,000 to 8,000 Feet [1] 2.8 to 4.3 Volts

8,000 to 9,000 Feet [1] 2.6 to 4.2 Volts

9,000 to 10,000 Feet [1] 2.5 to 4.0 Volts

[1] Apply 10 in. Hg to MAP SENSOR at given altitude and watch voltage. It should drop 1.0 to 1.5 Volts from Voltage Specification given.



MANIFOLD OR INTAKE AIR TEMPERATURE SENSOR (MAT/IAT)


212°F or (100°C) 177 Ohms

194°F or (90°C) 241 Ohms

176°F or (80°C) 332 Ohms

158°F or (70°C) 467 Ohms

140°F or (60°C) 667 Ohms

122°F or (50°C) 973 Ohms

113°F or (45°C) 1188 Ohms

104°F or (40°C) 1459 Ohms

95°F or (35°C) 1802 Ohms

86°F or (30°C) 2238 Ohms

77°F or (25°C) 2796 Ohms

68°F or (20°C) 3520 Ohms

59°F or (15°C) 4450 Ohms

50°F or (10°C) 5670 Ohms

41°F or (5°C) 7280 Ohms

32°F or (0°C) 9420 Ohms

23°F or (-5°C) 12,300 Ohms

14°F or (-10°C) 16,180 Ohms

5°F or (-15°C) 21,450 Ohms

-4°F or (-20°C) 28,680 Ohms

-22°F or (-30°C) 52,700 Ohms

-40°F or (-40°C) 100,700 Ohms



THROTTLE POSITION SENSOR



Voltage [1] 0.20-1.25 volts
Voltage [2] 0.33-1.33 volts
Voltage [3] 0.20-0.95 volts

NOTE:

[1] TPS voltage is checked at idle. The maximum TPS reading at idle is 1.25 volts.
[2] 1989 2.0L VIN 1 and 1990-91 2.2L VIN G only. 1.33 volts is the maximum TPS reading at idle.
*** UPDATED BY TSB #91-198-6E DATE: 3/90
[3] 1991 5.0-5.7L VIN E,7 vehicles only. The TPS has an auto zeroing feature. If the voltage reading is within the range of about 0.20 to 0.95 volts, the ECM will use that value as closed throttle. If the voltage reading is out of the auto zero range at closed throttle, check for a binding throttle cable or damaged linkage.

ECM CONTROLLED RELAYS AND SOLENOIDS


Check the resistance of each ECM controlled relay or solenoid coil before replacing an ECM. Replace any relay or solenoid if the resistance measurement is less than 20 ohms. See ECM wiring diagrams under ELECTRICAL AND ELECTRONIC DIAGRAMS for coil terminal identification of solenoids and relays to be checked.