REPAIR STEPS
SOLUTION
DIAGRAMS
PROBLEM
MI91.2132
11JUN98
REFER TO MP85.3460
Part 4
While pushing the
horizontal/vertical
switch toward ver-
tical:
a. The pump will
not run.
Use the master and pump relay connection diagram for this test. Con-
nect a test light to Terminal 3 of the master relay. With the control panel
"ON", check Terminals 1, 2, 4, 5 and 7 of the master and pump relays.
The control panel must be ON, the H/V switch does not have to be
pushed.
If there is no power at Terminal 1
inal 3 is tight, clean and not corroded. Check that the wire to Termin-
check that the connection at Term-
al 3 is good and has a solid, clean ground connection. This is ground
for the master relay. If not, fix those connections. If there is a good
ground to Terminal 3 and no power on Terminal 1, check the connec-
tion at Terminal 1. Check the battery connections and battery voltage.
Check the battery ground. Terminal 1 must have a good +12 volt supply
from the battery. Make sure the pump has a good solid, clean frame
mounting or connection.
REFER TO MP85.3460
REFER TO MP85.3466
Part 3 continued
d. The pump runs.
Use the master and pump relay connection diagram for this repair. Dis-
connect the gray wire from Terminal 6 of the pump relay. Turn the sys-
tem on. If the pump runs, replace the pump relay. If the pump does
not run, reconnect the gray wire. With the system on, if the pump does
not run, the pump relay was stuck. Check and clean all connections
and check battery voltage. Low battery voltage or corroded connec-
tions can cause a relay to stick. If the pump runs with the panel on,
turn the panel OFF. Unplug connection B. Use a jumper to connect
Terminal 1 and Terminal 2 of the master relay. If the pump runs, the
gray wire in the pump harness is shorted to ground. If the pump does
not run, unplug connection A and plug in connection B. With Termin-
als 1 and 2 jumped together, the pump runs, replace the fuse board.
If the pump does not run, unplug the 11 pin plug from the control panel.
Plug in connection A. With Terminals 1 and 2 jumped together, the
pump runs, the gray wire in the control harness is shorted to ground.
If the pump does not run, replace the control panel.
e. The air starts to
exhaust from the
vehicle suspension.
Unplug connection C at the fuse panel. Turn the master switch on again.
If air exhausts from the suspension, replace the fuse panel (breaker
board). If air does not exhaust from the suspension, check that the
black wire for the air dump in the control harness is not shorted to the
red wire in the control harness. If the harness is ok, replace the control
panel.
