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Volvo All Engines (2004 Emissions) Fault Code: PID 84 FMI 9 Vehicle Speed Status

Fault Condition: The Vehicle Speed Status code will set when the Engine Management System (EMS) Module has lost the Vehicle Speed Message (J1708) that is sent from the Vehicle Electronic Control Unit (VECU). Engine power will be reduced.

Possible repairs:

1) Verify that code PID 84 FMI 9 is set. If code PID 84 FMI 9 is not set, wiggle the harness and connectors to try to set the code. Visually inspect the VECU connectors and wires for poor connections.
2) If code MID 144 PID 84 is set, repair code MID 144 PID 84 and retest the system. If only MID 128 PID 84 is set, the Vehicle Electronic Control Unit (VECU) may be faulty, call MACK Reliability Engineering.

Circuit Description:

1) The J1587 and J1939 serial data lines are used as the standard communication link for on-board vehicle instrumentation, off-board service diagnostics and fleet management. The vehicle electronic control unit (VECU) is linked to the Engine Management System (EMS) Module via these data lines.

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