SRX AWD V8-4.6L VIN A (2004)
Speedometer Head: Description and Operation
SPEEDOMETER
The IPC displays the vehicle speed based on the information from the ECM. The ECM sends a 4,000 pulses per mile signal to the cluster discretely. The
IPC calculates the vehicle speed using the time difference between consecutive pulses. The speedometer will default to zero if the time duration since the
last speed pulse is greater than or equal to 1 second.