B0540
CIRCUIT DESCRIPTIONThe DIC receives the vehicle speed information from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The PCM also sends a class 2 message to the DIC indicating the vehicle speed. If the DIC determines there is a loss of the vehicle speed signal from the PCM due to a vehicle speed signal circuit malfunction, a DTC sets.
CONDITIONS FOR RUNNING THE DTC
^ The DIC detects a RAP 1 fuse supply voltage.
^ The ignition 1 voltage is between 9.8 volts and 16.5 volts.
CONDITIONS FOR SETTING THE DTC
^ The DIC receives a class 2 message from the PCM indicating a vehicle speed of greater than 3 km/h (1.86 mph).
^ The DIC detects a loss of vehicle speed on the vehicle speed signal circuit.
^ The above condition is present for greater than 15 seconds.
ACTION TAKEN WHEN THE DTC SETS
The DIC stores DTC B0540 in memory.
CONDITIONS FOR CLEARING THE DTC
^ The DTC becomes history when the fault is no longer present.
^ A history DTC clears after 100 malfunction free ignition cycles.
^ The DIC receives the clear code command from the scan tool.
TEST
