MAN #650778
14
Troubleshooting guide
Problem
Possible cause
Solution
Gauge will not light up
Red/Orange wire does not have power.
Inspect and repair stock harness.
Black/Green wire is not getting a good ground.
Inspect and repair stock harness.
CAN bus wiring open or short.
Inspect and repair stock harness.
Ignition switch not connected or damaged.
Inspect and repair stock switch or harness.
Gauge is damaged.
Return gauge for repair. (see instructions)
Gauge lights up, but speed
No data from ECM.
Check engine trouble codes.
will only show zero.
Speed sensor not grounded properly.
Inspect stock harness.
Sensor is not sending a speed signal.
Check for a damaged or malfunctioning speed sensor.
Speed reading is erratic or
Speed sensor wire is loose or broken.
Check all wire connections and inspect wire for breaks.
jumps around.
Poor ground connection.
Check ground connection on speedometer and sensor.
Ignition interference
Check for tachometer wires routed with VSS signal wires.
Check for VSS signal wires routed near ignition coils
Check for poor ignition system ground
Use suppression spark plug wires
Speed reading is incorrect.
Gauge is not calibrated correctly.
Gauge must be calibrated (see instructions).
Gauge lights up, but tach
No data from ECM.
Check engine trouble codes.
will only show zero.
Engine indicator does
No data from ECM.
Check engine trouble codes.
not work.
Oil Temperature reading
Oil Temp sender is not enabled in setup menu.
does not show up.
Oil pressure not available on 2017-up applications.
Oil temperature
Sender is shorted to ground.
Inspect wire for bare insulation or pinching.
Pressure power wire is not connected.
Connect sensor RED wire to gauge WHITE/RED wire.
Oil temperature
Sender wire is open or broken.
Inspect for breaks in wire connection.
Sender is not grounded.
Check sender ground connection.
Low fuel not turning
Incorrect setting or turned off.
on.
up is correct or adjust the value.
Low fuel turning on
Incorrect setting.
Verify setting or adjust value following FUEL menu adjust
too early/late.
feature in setup.
Low fuel always on.
Sensor damaged.
Check resistances following procedure in service manual.
Gauge display has white
This is a default setting on this gauge to increase visibility in direct
background in sunlight
Speed sensor voltage check:
All checks should be made with the sensor connected to the gauge and the key on. Checks should be done with a volt
meter and not a test light.
3-wire sensor:
Red wire should have 9-11 volts dc, slightly less than battery voltage.
Black wire should show ground, 0 volts dc at all times.
White wire should vary between 0 and 5 volts dc as the gear teeth pass by the sensor.
2-wire sensor:
Measure the voltage between the two sensor wires. With the wheel spinning the voltage should be about 1-10 volts ac (make sure the
meter is set to AC volts and not DC volts for this check).
