N: Tachometer Inoperative, Erratic, Wrong Indication, Ranger and Explorer

N1 CHECK FUSE


^ Check fuse.


^ Is fuse OK?


Yes

GO to N2.


No

REPLACE fuse. If fuse blows again, CHECK for short in circuit.



N2 CHECK WIRING


^ Check for loose wiring connections in engine compartment or at instrument cluster.


^ Is wiring OK?


Yes

GO to N3.


No

SECURE loose connections.



N3 MAKE RESISTANCE CHECKS



CAUTION: Before checking the continuity of any circuit, make sure there is no voltage present in the circuit prior to switching the test equipment to the resistance function to avoid damage to equipment. Refer to the test equipment user's manual for additional information.


^ Disconnect battery ground cable. Remove instrument cluster and make resistance and voltage checks (using Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent) at 14401 wiring harness connector as follows:







Check Pin No.2 (Connector A) resistance to chassis ground - should read 1 ohm or less. Check Pin No.8 (Connector A) to Pin No.12 of EDIS Connector. Resistance should be 1 ohm or less.



CAUTION: Make sure multimeter is in the voltage function and not in the resistance function to avoid damage to multimeter. Connect battery. Turn key on. Check for +12 volts at Pin No.14 (Connector A). Turn key off. Disconnect battery.


Is resistance within specifications?


Yes

REPLACE tachometer.


No

Condition is not in tachometer . SERVICE wiring.