Early Models
COOLANT TEMPERATURE SENSORTemperature-to-Resistance Values
(Approximate)
~F ~C Ohms
212 100 185
160 70 450
100 38 1,600
70 20 3,400
40 4 7,500
20 -7 13,500
0 -18 25,000
-40 -40 100,700
MANIFOLD AIR/FUEL TEMPERATURE (MAT) SENSOR
Temperature-to-Resistance Values
(Approximate)
~F ~C Ohms
212 100 185
160 70 450
100 38 1,600
70 20 3,400
40 4 7,500
20 -7 13,500
0 -18 25,000
-40 -40 100,700
THROTTLE POSITION SENSOR (TPS) [1] .75 to .85
ENGINE SPEED SENSOR (CPS) 200 +/- 75 ohms [2]
OXYGEN SENSOR (O2) HEATING ELEMENT less than 10 ohms
RELAY (MECHANICAL) 70 to 80 ohms [3]
RELAY (DIODE) 81 to 91 ohms [3]
[1] This is the desired ratio between input and output voltages of the TPS. EXAMPLE: If the input voltage is 5 volts and the output voltage is 3.75 volts; divide 3.75 by 5 (3.75/5 = .75 or 75%).
[2] Engine Speed Sensor resistance check is made between terminals A and B, as they are marked on the connector.
[3] Resistance measurements taken between terminals 85 and 86 as marked on the relay.