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Symptom: *CHECKING THE VEHICLE SPEED SIGNAL POSSIBLE CAUSES CHECK FOR CONTROLLER ANTILOCK BRAKE DTCS CONTROLLER - ANTILOCK BRAKE POWERTRAIN CONTROL MODULE VEHICLE SPEED SIGNAL CIRCUIT OPEN ENGINE CONTROL MODULE INSTRUMENT CLUSTER VEHICLE SPEED SIGNAL CKT BETWEEN JB AND INSTRUMENT CLUSTER SHORTED TO ENGINE CONTROL MODULE JUNCTION BLOCK VEHICLE SPEED SIGNAL CIRCUIT SHORTED TO GROUND TEST ACTION APPLICABILITY 1 Turn the ignition on. All Yes → Test Complete. No → 2 Turn the ignition on. All Yes → Refer to symptom list for problems related to CAB DTCs before No → 3 Turn the ignition off. All Yes → No → 268 DRIVEABILITY - DIESEL |