Cherokee 2WD L6-242 4.0L VIN M FI (1987)
Fig. 4 Manifold air temperature sensor resistance value chart.
1.
Disconnect electrical connector from MAT sensor.
2.
Using a suitable ohmmeter check MAT sensor resistance, Fig. 4.
3.
If MAT sensor resistance is not within limits, replace sensor.
4.
Using a suitable ohmmeter, check resistance between ECU electrical connector terminals D-3 and C-8 and sensor electrical connector terminals,
Fig. 3. If resistance is greater than 1 ohm, repair wiring as necessary.