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Home >> Lincoln >> 2011 >> MKS EcoBoost >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Anti-Lock Brake System - Vehicle Dynamic Systems >> Diagnosis And Testing >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test I: DTCs C1280, C1282, C1963, C1975, U0074, U0151, and U0452 >> Normal Operation

Normal Operation

The Restraints Control Module (RCM) measures the yaw rate and vehicle acceleration, then sends the signal through a secondary, dedicated Controller Area Network (CAN) bus to the ABS module. The ABS module uses this information for AdvanceTrac® system operation. The ABS module also compares this information to information it receives from other sensors (brake pedal input, steering wheel, etc.) to determine how valid the information is and to determine if an instability event is about to occur.

The RCM and the ABS module communicate along circuits VCA23 (BU/WH) and VCA24 (GN/OG). An open circuit or a short to power or ground on any one of these circuits will cause the ABS module to set a DTC. Also, if the RCM is not mounted in the correct position, with the electrical connector facing the rear of the vehicle, the ABS module will also set DTCs.

DTC DESCRIPTION TABLE

DTC Description Fault Trigger Condition
  • C1280 - Yaw Rate Sensor Signal Fault
  • C1282 - Lateral Accelerometer Signal Fault
 If the ABS module receives a message from the RCM that is out of the normal operating range or one that does not agree with other sensor information, the appropriate signal fault DTC will be set.
  • C1963 - Stability Control Inhibit Warning
  • C1975 - IVD Plausibility Failure

(1)		 If conditions or DTCs exist that prevent the AdvanceTrac® system from operating, DTC C1963 and/or C1975 will be set. This DTC is usually set due to the steering wheel rotation sensor or the RCM being damaged or installed incorrectly.
  • U0074 - Control Module Communication Bus B Off
  • U0151 - Control Module Communication Bus B Off
  • U0452 - Control Module Communication Bus B Off
 The RCM uses a dedicated communication bus to send information to the ABS module. If during normal operation, the ABS module does not receive any information from the sensor cluster for more than 250 milliseconds, DTC U0074, U0151 or U0452 will be set.
(1) Interactive Vehicle Dynamics

This pinpoint test is intended to diagnose the following: 

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