Nissan Maxima Service and Repair Manual: P1722 vehicle speed
The vehicle speed signal is transmitted from ABS actuator and electric unit (control unit) to TCM via CAN communication line.
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION: Always drive vehicle at a safe speed.
NOTE: Immediately after performing any "DTC CONFIRMATION PROCEDURE", always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
1.CHECK DTC DETECTION
Turn ignition switch ON.
Select "Data Monitor" in "TRANSMISSION".
Start engine and maintain the following conditions for at least 5 consecutive seconds.
ACC PEDAL OPEN : 1.0/8 or less
VEHICLE SPEED : 30 km/h (19 MPH) or more
1.CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Perform "Self Diagnostic Results" in "ABS".
2.CHECK DTC WITH TCM
Perform "Self Diagnostic Results" in "TRANSMISSION".
3.DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.