Pinpoint Test J: Incorrect Tachometer Indication
Instrumentation, Message Center and Warning Chimes
Pinpoint Test J: Incorrect Tachometer Indication
Normal Operation
The PCM uses the Crankshaft Position (CKP) to measure the engine rpm. The PCM sends the Instrument Cluster (IC) the data over the High Speed Controller Area Network (HS-CAN) communication bus, to command the tachometer gauge according to the data.
If the engine rpm data is missing or invalid for 5 seconds or less or if the IC receives invalid engine rpm data for 5 seconds or less, the IC defaults the tachometer to the last setting, based upon the last known good engine rpm message received.
NOTE: If DTC U0100 is set in the IC, other observable symptoms may be an inoperative speedometer, temperature gauge or odometer.
If the IC does not receive the engine rpm data message from the PCM for more than 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the tachometer to 0 rpm.
If the engine rpm data is deemed invalid by the IC for more than 5 seconds, the IC sets DTC U2196 and defaults the speedometer to 0 km/h (0 mph).
This pinpoint test is intended to diagnose the following:
- CKP sensor
- IC
PINPOINT TEST J: INCORRECT TACHOMETER INDICATION
