Tachometer Test

NOTE: DO NOT allow engine speed to exceed allowable range, engine could be damaged.

Connect New Generation Star (NGS) Tester (49-T088-0A0) to battery and Data Link Connector (DLC) located under left side of instrument cluster, near steering column. Using NGS tester, select VEHICLE & ENGINE SELECTION, and enter vehicle specifications.
Using NGS tester, select PID/DATA MONITOR AND RECORD, and then select PCM - POWERTRAIN CTRL MODULE. Select RPM, and then press START. Verify tachometer is within allowable range. See TACHOMETER VARIATION SPECIFICATIONS table. If tachometer is not within allowable range, check engine speed signal transmitter (ECM/PCM) and related wiring harness. If engine speed signal transmitter (ECM/PCM) and related wiring harness are okay, replace tachometer.

TACHOMETER VARIATION SPECIFICATIONS