Cutlass Ciera Cruiser V6-3300 3.3L (1989)
Tachometer: Technical Service Bulletins
Instrumens - Updated Tachometer Diagnosis
SUBJECT:
SERVICE MANUAL UPDATE - SECTION 8A-81 INSTRUMENT PANEL GAUGE TACHOMETER
MODELS/YEARS:
1985-89 CUTLASS CIERA
NUMBER:
89-T-100
CORP. REF. NO: 938129
DATE:
July 1989
SECTION:
8A
The text included in Section 8A-81 of the 1985 through 1989 Cutlass Ciera Service Manuals should be replaced with the new diagnosis information.
Please insert the following text in your copy of the 1985 through 1989 Service Manuals.
TACHOMETER DIAGNOSIS
1.
Get the J33431 Instrument Panel Cluster Tester and connect the J33431-10 harness connector to the J33431.
2.
Disconnect the connector to the Ignition Module which contains the Tachometer wire.
3.
Connect the black lead of the J33431-10 to ground and the red lead to the Tachometer lead of the Ignition Module Connector.
4.
Plug the J33431 into a nearby 120 volt outlet.
5.
Set the Tester Frequency Signal Switch to 60Hz and Power switch to ON.
6.
Put the vehicle Ignition Switch in RUN and observe the Tachometer.
^
If the Tachometer shows 1350 rpm (6 cy) or 1800 rpm (4 cy), replace the suspect Ignition Module.
^
If the Tachometer does not operate, check the wire to the Tachometer for an open or short to ground. Check that the Instrument Panel
Cluster Connectors and the screw connections at the back of the cluster are clean and tight. If all of the above are OK, replace the
Tachometer (See Section 8C for remove/replace procedures).
