Pinpoint Test Z: DTC U1900-Can Communication Bus Fault-Receive Error
NOTE:
Check all pins of the sensor cluster and ABS module when removing connectors. Care should be taken when reinstalling these connectors.
- Z1 CHECK THE CAN CIRCUITS FOR AN OPEN OR SHORT TO GROUND Fig 1: Measuring Resistance Between ABS Module And 4WD Control Module Harness Side And Between ABS Module
Courtesy of FORD MOTOR CO.
- Turn ignition off.
- Disconnect ABS module C155 connector.
- Disconnect 4WD control module C218b connector.
- Measure the resistance between the ABS module and the 4WD control module harness side; and between the ABS module, harness side and ground as follows:
BRAKE PEDAL TRAVEL SENSOR CONNECTOR-PIN REFERENCEABD Module Connector 4WD Control Module Connector Circuit Number and Color C155-11 C281b-9 3126 (TN/YE) C155-15 C281b-1 3125 (RD/YE) - Are the resistances less than 5 ohms between the ABS module and the 4WD control module, and greater than 10,000 ohms between the ABS module and ground?
- Yes : GO to Z2.
- No : REPAIR the circuit. REPEAT the self-test.
- Z2 CHECK FOR 4WD CONTROL MODULE OPERATION
- Disconnect all the 4WD control module connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the 4WD control module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new 4WD control module. TEST the system for normal operation.
- No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.