MI91.327G
01NOV11
PART 6. SECTION A. CONTINUED
2. THE SYSTEM STARTS TO DUMP AIR FROM THE SUSPENSION BUT STOPS DUMPING AIR
WHEN THE "DUMP" BUTTON IS RELEASED. Make sure the vehicle has a pilot air dump system and
not a dump system that uses HWH air dump valves. Check the travel LED on the I/O module. If it is on
after releasing the DUMP button, replace the I/O module. If the travel LED is not on, there is an issue
with the air dump equipment. Contact the vehicle manufacturer. SEE: MP84.3170
3. THE VEHICLE SUSPENSION WILL NOT RETURN TO RIDE HEIGHT WHEN THE "STORE"
BUTTON IS PUSHED AND THE IGNITION IS ON. Make sure the suspension air tanks are full. Push
any UP arrow. The pump should start to run. If the pump does not run, proceed to PART 7 Section B
If the pump runs, communication between the touch panel and the I/O module is ok, the master relay is
on and there is output voltage to the I/O module. Check the travel LED on the I/O module, it should be
on. The dump LED should be off. SEE: MP84.3170
The TRAVEL LED is on. Unplug the 3 pin Packard connector at the I/O module and check for voltage
between the white ground wire in pin A and the 9301 dump wire in pin C. If there is no voltage, make
sure the wire to pin connections for both wires are ok. Fix if necessary. If the connections are ok,
replace the I/O board. If there is voltage between the white wire and the 9301 wire, plug the connector
back in and locate the 4 pin UML connector and check for voltage between the white wire in pin 3 and
the 9301 dump wire in pin 2.
out while pushing the DUMP button or will still not dump air, the problem is the chassis harness or the
back in and check the dump LED while pushing the DUMP button. If the LED does not come on, goes
Packard connector and the 4 pin UML connector. If the LED stays on, plug the 4 pin UML connector
is off or goes out, there is a short to ground on the 9300 dump wire in the harness between the 3 pin
3 pin Packard connector back in. Check the dump LED while pushing the DUMP button. If the LED
but could be the touch panel. If the LED is now on, find the 4 pin UML plug and unplug it. Plug the
LED while pushing the DUMP button. If the LED is still off, the problem is most likely the I/O module
about 10 - 15 seconds and plug the 32 pin connector back in. Turn the ignition on. Check the dump
the I/O module. Turn the ignition off. Unplug the 32 pin harness connector at the I/O module. Wait
The DUMP LED is not on while pushing the DUMP button.
voltage at the 4 pin UML connector, the problem is with the connections or harness wires between the
in, the problem is with the suspension dump equipment, contact the vehicle manufacturer. If there is no
pin 1. If there is good voltage (10 volt or more) at the 4 pin UML connector, with the connector plugged
4 pin UML connector and check for voltage between the white wire in pin 3 and the 9300 dump wire in
If there is voltage between the white wire and the 9300 wire, plug the connector back in and locate the
connections for both wires are ok. Fix if necessary. If the connections are ok, replace the I/O board.
wire in pin A and the 9300 dump wire in pin B. If there is no voltage, make sure the wire to pin
Unplug the 3 pin Packard connector at the I/O module and check for voltage between the white ground
The DUMP LED is on while pushing the DUMP button, air will not dump from the suspension.
to the I/O module. Check the red LED for dump on the I/O module while the "DUMP" button is being
between the touch panel and the I/O module is ok, the master relay is on and there is output voltage
to run. If the pump does not run, proceed to PART 7 Section B. If the pump runs, communication
Make sure the ignition is on and the park brake is set. Push any UP arrow. The pump should start
1. THE AIR DOES NOT START TO DUMP WHEN THE "DUMP" BUTTON IS PUSHED.
3 pin Packard connector and the 4 pin UML connector.
pilot dump valve. Contact the vehicle manufacturer for assistance. SEE: MP84.3135 and MP84.3245
pushed. This LED should be on. SEE: MP84.3170
Unplug the 3 pin Packard connector at
SEE: MP84.3170 and MP84.3135
725 TROUBLE SHOOTING STEPS
MANUAL SYSTEM OPERATION
SEE: MP84.3135 and MP84.3245
MP84.3170
LINK LIGHT
MASTER RELAY
PUMP RELAY
DUMP
TRAVEL
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
725 SERIES SINGLE STEP LEVELING SYSTEM
ELECTRICAL CONNECTION DIAGRAM
FUSE
15 AMP
MANUAL
HWH COMPUTERIZED LEVELING
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
TOUCH PANEL
7699
7699
PARK BRAKE
DIODE
NOTE: DIODE ARRANGEMENT MAY NOT BE
PRESENT ON ALL INSTALLATIONS
LR
BY O.E.M.
CONNECTION
PILOT DUMP
SWITCH
PRESSURE SWITCH
4200
SWITCH
WARNING
4000
B
A
6235
TO +12V ACC.
PARK BRAKE
LIGHT
9001 - TO
9000
9301 TRAVEL
9300 DUMP
6230 GND
6111
LIGHT
DIODE
WARNING
MASTER
LF
SWITCH
12V IGNITION
CONNECT TO
_
+
6111
BUZZER
1000
FUSE
5AMP
1200
B
A
6235
BRAKE
CANCEL
STORE
AUTO
DO NOT CUT
WARNING!
DUMP
MANUAL
MODE
TRAVEL
RETRACT
AUTO
LEVEL
R
NOT IN
PARK/
SLOPE
EXCESS
EXTEND
WARNING
PRESSURE
SWITCH
SEE ELECTRICAL CONNECTION DIAGRAM
MULTIPLEXED INPUT/OUTPUT MODULE
PRESSURE SWITCH
3200
WARNING
SWITCH
6235
3000
B
A
TERMINATING
DO NOT CUT
RESISTOR
06JUN11
MP84.3135
RR
8100
8101
PUMP AND MASTER RELAYS
SEE ELECTRICAL CONNECTION
W/PILOT AIR DUMP
LEVELING SYSTEM HYDRAULIC MANIFOLD
SEE ELECTRICAL CONNECTION DIAGRAM
SWITCH
DIAGRAM - SENSING UNIT
TERMINATING
RESISTOR
RETRACT
EXTEND
CONNECTION
PILOT AIR DUMP
9301
9300
6230
B
C
A
6235
2000
2200
B
A
WARNING
SWITCH
PRESSURE
RF
MP84.3135
SWITCH
PRESSURE
50 LB
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD W/PILOT AIR DUMP
ELECTRICAL CONNECTION DIAGRAM
#4
MULTIPLEX I/O MODULE
DETAIL (A) - TOP VIEW
6230 (RELAY GND)
RELAY (A)
MASTER
+12 VOLT
BATTERY
TO
#9
+
CONTROL
MASTER RELAY
8500 (BLACK)
#1
#3
#2
MOTOR
PUMP
6230 (RELAY GND)
40 AMP
FUSE
6800
LR
A
B
SWITCH
PRESSURE
3000 LB
8100
TO GROUND STUD
ON PUMP (6230)
6230
6230
4400
A
B
A
6230
2400
1400
B
A
B
6230
3400
A
B
P.E.D
P.E.D
LR
P.E.D
P.E.D
RR
SYSTEM - PILOT AIR DUMP
SINGLE STEP LEVELING
DIAGRAM - 725 SERIES
SEE ELECTRICAL CONNECTION
CONTROL
PUMP
RELAY (B)
#7
#8
#5
#6
GROUND STUD
SIDE VIEW
POWER UNIT
8600 - (BLACK)
PUMP RELAY
HARNESS
TOUCH PANEL
TRAVEL 9301
DUMP 9300
GND 6231
RR
LF
RF
B
A
A
B
B
A
07JUN11
MP84.3245
MULTIPLEX
SEE DETAIL (A)
I/O MODULE
A
B
C
DEUTSCH CONNECTOR
GROUND STUD IN MANIFOLD
SHOWN HERE BENEATH THE
RELAY (A)
SEE DETAIL (A)
LF
RF
MASTER
MOTOR
PUMP
MULTIPLEX I/O MODULE
8101
RELAY (B)
TOP VIEW
POWER UNIT
PUMP
MP84.3245
MP84.3170
PUMP RELAY
MASTER RELAY
LINK LIGHT
TRAVEL
DUMP
MP84.3245
SEE DETAIL (A)
MULTIPLEX I/O MODULE
ELECTRICAL CONNECTION DIAGRAM
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD W/PILOT AIR DUMP
TOUCH PANEL
HARNESS
GND 6231
DUMP 9300
TRAVEL 9301
PUMP RELAY
8600 - (BLACK)
CONTROL
MULTIPLEX I/O MODULE
+
#9
6230 (RELAY GND)
MASTER
RELAY (A)
#4
BATTERY
TO
+12 VOLT
CONTROL
#3
#1
#2
DETAIL (A) - TOP VIEW
6230 (RELAY GND)
MASTER RELAY
8500 (BLACK)
FUSE
40 AMP
PUMP
MOTOR
RELAY (B)
#8
PUMP
#5
#7
#6
6800
B
A
LR
RR
B
B
A
B
LF
A
RF
A
TO GROUND STUD
ON PUMP (6230)
4400
6230
A
B
3400
6230
A
B
6230
2400
1400
6230
A
B
BA
3000 LB
PRESSURE
SWITCH
8100
P.E.D
LR
P.E.D
P.E.D
P.E.D
RR
LF
RF
50 LB
PRESSURE
SWITCH
8101
SIDE VIEW
POWER UNIT
GROUND STUD
07JUN11
MP84.3245
SEE ELECTRICAL CONNECTION
DIAGRAM - 725 SERIES
SINGLE STEP LEVELING
SYSTEM - PILOT AIR DUMP
I/O MODULE
SEE DETAIL (A)
MULTIPLEX
C
A
B
RELAY (A)
SHOWN HERE BENEATH THE
GROUND STUD IN MANIFOLD
DEUTSCH CONNECTOR
MASTER
PUMP
MOTOR
RELAY (B)
TOP VIEW
POWER UNIT
PUMP
MP84.3135
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
ELECTRICAL CONNECTION DIAGRAM
725 SERIES SINGLE STEP LEVELING SYSTEM
TERMINATING
SEE ELECTRICAL CONNECTION DIAGRAM
MULTIPLEXED INPUT/OUTPUT MODULE
PRESSURE SWITCH
LEVELING SYSTEM HYDRAULIC MANIFOLD
SEE ELECTRICAL CONNECTION DIAGRAM
SEE ELECTRICAL CONNECTION
DIAGRAM - SENSING UNIT
WARNING
9000
TO +12V ACC.
9301 TRAVEL
PRESSURE SWITCH
PARK BRAKE
9001 - TO
LIGHT
LR
4200
SWITCH
WARNING
4000
A
B
6235
PARK BRAKE
NOTE: DIODE ARRANGEMENT MAY NOT BE
PRESENT ON ALL INSTALLATIONS
DIODE
CONNECTION
PILOT DUMP
BY O.E.M.
SWITCH
6230 GND
9300 DUMP
15 AMP
FUSE
DO NOT CUT
12V IGNITION
CONNECT TO
_
WARNING
SWITCH
6111
LIGHT
7699
DIODE
MASTER
WARNING
BUZZER
7699
6111
+
1000
A
B
FUSE
5AMP
1200
6235
LF
SWITCH
PRESSURE
HWH COMPUTERIZED LEVELING
TOUCH PANEL
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
MANUAL
STORE
MODE
WARNING!
TRAVEL
DUMP
CANCEL
RETRACT
DO NOT CUT
AUTO
LEVEL
AUTO
SLOPE
PARK/
BRAKE
NOT IN
EXCESS
MANUAL
EXTEND
R
RETRACT
RESISTOR
TERMINATING
EXTEND
3200
SWITCH
WARNING
6235
3000
A
B
MP84.3135
06JUN11
RR
RESISTOR
8100
8101
W/PILOT AIR DUMP
PUMP AND MASTER RELAYS
CONNECTION
PILOT AIR DUMP
B
A
6230
9300
C
9301
6235
2000
A
B
2200
SWITCH
PRESSURE
SWITCH
RF
