Coolant Sensor

General Information

This is the ONLY coolant sensor the ECM sees. It tells the ECM, obviosly, how hot the motor is so it can go into closed loop and aids in determining proper timing & fuel mix.

ECM coolant sensor
 84-88 all   10045847   blk & yel   L4- thermostat housing
 85-88 all   25036979               V6- RH top of engine
                                        near thermostat

From: Tin Man

Testing

The coolant sensor (to the ECM) varies the resistance.

The Pontiac Service Manual lists:
(approximate)

 
      F        C           OHMS
    210      100            185
    160       70            450
    100       38           1800
     70       20           3400
     40        4           7500
     20       -7          13500
      0      -18          25000
    -40      -40         100700

From: Scott Backer

[Top] | Online Service Guide Main Page