Digital Databuses – J1939

Digital Databuses – J1939

• 2007 Spartan Chassis have multiplexed gauges.• The gauges use J1939 as the source for all of the engine and

transmission information speedometer acts as master gauge:– Speedometer– Tachometer– Oil Pressure– Engine coolant temp– Voltmeter– Transmission temp

• The fuel and air pressure gauges are not read from the J1939 databus.

2007 gauge diagnostics

• Diagnostic mode– PB set– Vehicle speed = 0– Ignition on

– Press “M” button for 5 seconds then release– “M” or “T” to scroll up or down– Press both “M” and “T” to enter selected diagnostic section

2007 Gauge Diagnostics

• Instrument diagnostics– Gauge test

• Tests gauge movements

– Lamp test• Tests each indicator lamp

– LCD test• Tests speedometer LCD

– Input Status• Provides status of inputs

2007 gauge diagnostics

• Engine Diagnostics– Screen displays SAE fault numbers

• SPN (suspect parameter number) • FMI (failure mode identifier)

– Press “M” or “T” to scroll up or down– See the attached link for cross reference– Link to Spartan Website for cross reference

2007 Gauge Diagnostics

• Transmission– Speedo displays transmission diagnostics– Transmission doesn’t support it

2007 Gauge Diagnostics

• ABS– Screen displays SAE fault numbers

• SID (subsystem identifier number) • FMI (failure mode identifier)

– Press “M” or “T” to scroll up or down

2007 Gauge Diagnostics• Read Parameters:

– Engine speed– Coolant temp– Avg Fuel economy– Barometer– Speed– Gear– Oil psi– Fuel level– Aux air psi

– Engine hours– Boost psi– Battery volts– Air primary– Air secondary– Trans temp– Dimmer %– Engine load %– Inst Fuel economy– Brake application psi

2007 Gauge Second Line Display

• Second line display – PB set– Vehicle speed = 0– Ignition on

– Press “M” button for less than 5 seconds then release– “M” or “T” to scroll up or down– Press both “M” and “T” to select the highlighted parameter for

second line display.Trip odometer - Instant fuel econ – Avg fuel econ – Hourmeter- Ammeter

2007 Gauge Configuration

• Configuration mode– PB set– Vehicle speed = 0– Battery master on– Ignition off– Press and hold both “M” and “T” – Turn ignition on– Press “M” or “T” to scroll up or down

Self test option – Bootloader Version – Software Version – Engine Type – Trans Type – ABS Type – Trip Odo

Icons

Icons Defined

Icon LCD TEXT Description

EXHAUST SYSTEM FAILURE Exhaust system failure

CLEAN DIESEL PARTICULATE FILTER

Diesel particulate filter needs cleaning

HIGH EXHAUST SYSTEM TEMPERATURE

Exhaust system temperature is high

STOP ENGINE Stop engine

CHECK ENGINE Check engine

CHECK TRANSMISSION Check transmission

WAIT TO START

Wait to start(pre-heater)

WATER IN FUEL Water is in the fuel

BRAKE SYSTEM FAILURE

Hydraulic brake system failure

ABS FAILURE The abs has a fault

ATC

TRACTION CONTROL ACTIVE Low traction

n/a High beams are on

Icons Defined

n/a Seat belt is not fastened

n/a Park brake is set

n/a Right turn active

n/a Left turn active

RESTRICTED AIR FILTER Air filter is restricted

COOLANT LEVEL LOW Low coolant level

SRS SUPPLEMENTAL RESTRAINT

SYSTEM FAILURE

Supplemental restraints system has a fault

OK TO

PUMP n/a It is ok to pump

PUMP ENGAGED

n/a The pump is engaged HIGH IDLE

n/a High idle AUX

BRAKE ACTIVE

n/a Auxiliary braking is active

Auto Neutral Feature• Transmission shifts to neutral when the PB is set• Tachometer displays “Range Inhibit”• Shifter displays

– left segment flashes the gear you had selected – Right segment “N”

• The transmission is in neutral but does not send out a neutral signal– Starter button doesn’t work– Functions dependant on neutral signal don’t work

• Fast idle, PTO, Etc…

DPF• Diesel Particulate Filter

– Also known as• Aftertreatment device, Catalytic converter

• Critical component for emission compliance

• Collects particulate matter

• Must regenerate periodically – Passive (no action required by operator)– Active (manual switch must be activated)

DPF Switches• DPF override– Disables regen

• DPF– Activates manual Regen

DPF Lamps• DPF

– Diesel Particulate Filter– Indicates Regeneration required

• HEST– High Exhaust

System Temperature

• MIL – Malfunction Indicator Lamp

(DDC Only)

DPF Lamp• Indicates need to regenerate DPF

– Steady on indicates need to perform regeneration

• Least serve level• Drive it hard - or• Stationary with manual switch

DPF Lamp• Indicates need to regenerate DPF

– Flashing indicates need to perform regeneration

• Moderately serve level• Stationary with manual switch• Failure to regen will lead to

potential engine derate

DPF Lamp & Check Engine Lamp • Indicates IMMEDIATE need to regenerate DPF

• High severity level• Stationary with manual switch• Failure to regen will lead to

potential severe engine derate

Stop Engine Lamp• Indicates DPF cannot be regenerated

– DPF is too restricted to be regenerated– Must be serviced by authorized engine service

center.

HEST Lamp• Indicates high exhaust temperatures• Temperatures vary

with engine model• May be speed

interlocked• Can come on during

normal operation• Will come on during

regeneration

MIL Lamp• Malfunction indicator lamp

• Indicates an emissions

related fault

• Detroit Diesel

engines only