LeSabre V6-231 3.8L VIN 3 SFI (1988)
2.
Turn ignition switch to RUN.
3.
While watching Tachometer (or having an assistant watch it), momentarily jumper the tachometer wire (121) terminal "E" at Ignition Module
connector to battery voltage, rapidly making and breaking jumper connection several times.
a.
If Tachometer pointer moves, replace Ignition Module.
b.
If pointer does not move, replace Instrument Cluster; see Section 8C.
Use this procedure when a J 33431 tester is available:
1.
Connect J 33431-10 harness connector to J 33431 tester.
2.
Disconnect Computer Controlled Coil Ignition Module connector which contains tachometer wire (circuit 121); see appropriate schematic.
3.
Connect J 33431-10 black lead to ground and red lead to Tachometer wire (121) on Ignition Module connector.
4.
Connect J 33431 tester to 120-volt AC outlet, set tester frequency signal switch to 60 Hz, speed signal switch to 54 mph and turn on power switch.
5.
Turn ignition switch to RUN and observe Tachometer.
a.
If Tachometer shows 1350 rpm, replace Ignition Module.
b.
If Tachometer does not operate, check circuits 39, 121, and 153 for proper voltage, and for open and short. Also, check that Instrument
Cluster connectors are clean and tight. If circuits and connectors are okay, replace Instrument Cluster; see Section 8C.
SECTION 8A-82, DIGITAL CLUSTER
Use this procedure when a J 33431 tester is not available:
1.
Disconnect Computer Controlled Coil Ignition Module connector which contains Tachometer wire (circuit 121); see appropriate schematic.
2.
Turn ignition switch to RUN.
3.
While watching Tachometer display (or having an assistant watch it), momentarily jumper the Tachometer wire (121) terminal "E" at Ignition
Module connector to ground, rapidly making and breaking jumper connection several times.
a.
If first bar on Tachometer display momentarily lights, replace Ignition Module.
b.
If first bar does not light, check tachometer wire (121) for open or short to ground. Also, check that Digital Cluster connectors are clean and tight.
If circuits and connections are okay, replace Digital Cluster; see Section 8C.
Use this procedure when a J 33431 tester is available:
