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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1154 (Vehicle Dynamic Systems) >> Diagnostic Tests >> Anti-Lock Control - Traction Control and Stability Assist >> Pinpoint Tests >> Pinpoint Test K: DTCs B1104, C1277 and C1278 - Steering Wheel Angle Sensor Fault and DTC C1963 - Stability Control Inhibit Warning >> Normal Operation

Normal Operation

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The steering wheel rotation sensor monitors the steering wheel position when the toothed-wheel on the steering shaft passes through the optical field of the sensor.

The steering wheel rotation sensor receives fused ignition voltage from central junction box (CJB) fuse 2 (10A) along circuit 640 (RD/YE), ground for the sensor is provided by the ABS module along circuit 1571 (BK). Steering wheel rotation (in degrees) is sent from the sensor to the ABS module along circuit 1572 (DG) and circuit 1573 (YE).

DTC Description Fault Trigger Condition
DTC B1104 Steering Angle Sensor Signal Error If during normal operation or the on-demand self test the ABS module detects two back-to-back sensor edges within one millisecond or steering angle sensor voltage is in an invalid range for 1.2 seconds, DTC B1104 will be set.
DTC C1277 Steering Wheel Angle 1 and 2 Circuit Failure If during normal operation or the on-demand self test the ABS module detects an open circuit, short to voltage or short to ground along circuits VCS06 (GY/BN) or VCS07 (VT/OG), DTC C1277 will be set. An internal failure of the steering wheel rotation sensor may also cause DTC C1277 to set.
DTC C1278 Steering Wheel Angle 1 and 2 Circuit Faulted If during normal operation or the on-demand self test the ABS module does not receive the steering wheel rotation sensor input or if the input received does not agree with the input from other sensors, DTC C1278 will be set.
DTC C1963 Stability Control Inhibit Warning If conditions exist during normal operation that prevents the roll stability control system from operating, DTC C1963 will be set. This DTC is usually set due to the steering wheel rotation sensor or the stability control sensor cluster being damaged or installed incorrectly. This DTC will not clear until the vehicle has been driven above 48 km/h (30 mph) with input from the steering wheel rotation sensor.

This pinpoint test is intended to diagnose the following:

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