SECTION 3—SAFETY INSPECTION/TROUBLESHOOTING
Part No 1118377 25 Pronto® M71™
Motor chatters or
runs erratically, or
only one motor
turns.
Damaged connector or worn
brushes.
Bad motor or gearbox
Ohm out motors. Check brushes and replace
brushes if necessary. Replace motor or gearbox if
high reading is present. Normal reading is 0-5
Ohms.
Controller malfunction. Check for error codes with programmer. Refer to
electronics manual, part number 1114808.
Wheelchair veers
to the left or right
when driving on
level surface.
Uneven tire pressure.
Motors out of balance.
Inflate tires
Replace tires if worn.
Use programmer to balance motors
E09/E10 error code
will not go away.
Bad motor connection.
Bad brake coil.
Check all connections. Ohm out each brake coil.
Normal reading is 45-50 Ohms.
Gearbox is leaking
Fluid.
Bad seal around drive shaft
Loose hardware.
If seal is bad, replace motor or gearbox. Remove
motor brushes and inspect for grease contamina-
tion. Replace motor or gearbox if contamination
is found.
If loose hardware is found retighten hardware.
Excessive clicking
coming from
motor/gearbox.
Bad bearing in motor or gearbox. Replace motor or gearbox.
Loose wheel hardware. Tighten hardware, (use removable Loctite™on
hardware). Follow torque settings in this manual.
Gearbox shaft
movement or bent
shaft.
Rough driving. Replace motor or gearbox.
Motor Stutters. Poor connection or worn brushes. Check motor connectors. Check brushes and
replace if necessary.
Motor Fails to start
after initial installa-
tion.
Battery voltage is too low.
Bad Connection
Brake Disengaged
Check batteries and recharge if necessary.
Check connector
Engage brake
Motor is running
then fails to restart
when stopped.
Heavy load on the motors forcing
controller into the current rollback
mode.
Leave power ON and allow controller to count
down, and recharge the wheelchair overnight with
power ON.
Blown fuse in battery wiring
harness.
Replace battery wiring harness.
Damaged Motor Replace brushes if necessary, or replace motor or
gearbox if internal damage is determined.
Ohm out motor to check for possible internal
damage (worn out brushes may be possible).
Controller power stage board or
relays may be damaged.
Replace controller or send to Invacare for repair.
Motor runs but
loses power.
Controller senses heavy load and
has entered the current rollback
mode.
Stop driving and let electronics cool.
Wheelchair loses all
power while
driving.
Bad Connection on wheelchair Turn power “OFF”, wait 10 seconds and turn
power back “ON”.
Check Joystick connection
Check Battery connection and fuses
SYMPTOM PROBABLE CAUSE SOLUTIONS