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Symptom: *CHECKING THE SPEEDOMETER OPERATION POSSIBLE CAUSES CHECK FOR VEHICLE SPEED SENSOR DTCS CHECK GAUGES AND OTHER LAMPS AT KEY ON COMPARETHE DRB VEHICLE SPEED WITH THE SPEEDOMETER INSTRUMENT CLUSTER POWERTRAIN CONTROL MODULE - 5-VOLT OPEN POWERTRAIN CONTROL MODULE - INTERNAL FAULT 5-VOLT SUPPLY CIRCUIT OPEN CHECK VSS CIRCUITS FOR A SHORT TO VOLTAGE CHECK VSS CIRCUITS FOR A SHORT TO GROUND CHECK VSS CIRCUITS FOR A SHORT TOGETHER CHECK VSS CIRCUITS FOR AN OPEN VEHICLE SPEED SENSOR TEST ACTION APPLICABILITY 1 Turn the ignition on and observe gauge and lamp operation during bulb check. All Yes → No → Refer to symptom list for problems related to Vehicle Communi- 2 Turn the ignition on. All Yes → Refer to symptom list for problems related to Vehicle Speed No → 3 With the DRB, monitor Vehicle Speed in the PCM Sensor Display menu. All Yes → No → 260 DRIVEABILITY - DIESEL |