Checking Sensors

[Precise1]

Measure sensor resistance with ohmmeter first. It should be 2100-2900 Ohm at 68 deg.F, 680-1000 Ohm at 122F and 300-330 Ohm at 176F. Then check sensor harness, as described in 1994 FSM, pages EF&EC-86..87. Replace sensor when you're sure that the sensor wiring and connectors have no faults.

 

This is for the coolant temp sensor for the ECU on a WD21.

 

Just trying to get some information all in one place, feel free to quote or copy in anything pertinent.

 

B

[Precise1]

Another one I just remembered from k9sar is checking the resistance of the O2 sensor, 1-1000 Ohms IIRC?? Feel free to correct...

 

B

 

Confirmed!!

diagnostic procedure 30 in the 95 FSM suppliment will walk you through the check of the O2 circuit and sensor

 

if you want a quick check... disconnect the O2 sensor and check the resistance between the outermost terminals. It should be between 1 and 1000 ohms. The rest of the procedure checks the circuit from the ECU etc.

Edited December 15, 2009 by Precise1
updated

[adamzan]

Here is the FSM version of the Coolant temp sensor specs.