Detection Condition

If PCM terminal "1Q" does not receive pulse signal from ABS/TCS control module, PCM determines that communication circuit has a malfunction when vehicle is driven greater than 3.3 MPH (5.3 km/h). See Fig 1 .

Fig 1: Identifying DTC P1627: PCM - ABS/TCS/HU/CM Line Communication Error, Circuit & Connector Terminals

Courtesy of MAZDA MOTORS CORP.