TACHOMETER
(1) With engine running, check for tachometer signal
at pin 43 of PCM connector (Fig. 13). See Tachometer
Calibration chart in Specifications. If OK,
go to next step. If not OK, refer to appropriate Powertrain
Diagnostic Procedures manual to test PCM.
(2) Disconnect battery negative cable. Unplug PCM
connector. Remove instrument cluster bezel and cluster
assembly. Disconnect instrument cluster connector
B (black connector).
(3) Probe cavity 3 of cluster connector B. Check for
continuity to a good ground. There should be no continuity.
If OK, go to next step. If not OK, repair short
circuit as required.
(4) Still probing cavity 3 of cluster connector B,
check for continuity to cavity 43 of PCM connector.
There should be continuity. If OK, replace tachometer.
If not OK, repair open circuit as required.