Carrier X4 7300 Operation & Service Manual page 259

5. Unlock tab on 35pin connector (2) & remove
connector.
6. Remove the four fasteners (1) mounting Power
Control module to unit frame & remove module
from unit
7. Follow steps above in reverse order to install
new Power Control Module. Torque:
• fasteners mounting module to frame (1) to 38 to
58 inch/lbs (4.3 to 6.6 Nm).
• M6 terminal nuts (3 & 7) to 30 to 40 inch/lbs (3.4
to 4.5 Nm).
• M8 terminal nuts (5 & 6) to 60 to 80 inch/lbs (6.8
to 9.0 Nm).
8. Note a component legend sticker is to be
located inside the PCM door. Install the correct
sticker (packaged with the replacement PCM)
for this unit inside the replacement PCM. The
replacement PCM is populated at the factory
with the standard fuses and relays. Additional
fuses and relays may be required for this appli-
cation (refer to Figure
fuses and relays from the original PCM to the
replacement PCM as required.
9. Make sure the latest software has been loaded
to ensure all modules are compatible, refer to
Section 5.3.4
When a module is replaced, software
should be upgraded before switching the
unit on. This will ensure software com-
patibility of all modules.
10. Start unit and run Pretrip to check operation.
8.10.3 Stepper Valve Module (SVM)
1. Ensure the unit will not start automatically by
disabling any two way communication, placing
the STOP/RUN-OFF switch in the OFF position
and removing the negative battery cable.
2. Unlock the tabs on and remove the two 35 pin
connectors and 8 pin connector from the front of
the module.
3. Replace module. Tighten mounting hardware to
96 inch/lbs (10.8 Nm).
4. Reinstall connectors ensuring tabs are fully
locked in place.
2.7) transfer the required
5. Make sure the latest software has been loaded
to ensure all modules are compatible, refer to
Section 5.3.4
When a module is replaced, software
should be upgraded before switching the
unit on. This will ensure software com-
patibility of all modules.
6. Start unit and run Pretrip to check operation.
8.10.4 Display Module (DM)
To service the Display Module do the following:
1. Ensure the unit will not start automatically by
disabling any two way communication, placing
the STOP/RUN-OFF switch in the OFF position
and removing the negative battery cable.
2. Unlock the tabs on, and then remove the 14 pin
connector from the back of the module.
3. Remove hardware at rear of module. Replace
module. Tighten mounting hardware to 84 to
120 inch/lbs (9.5 to 13.6 Nm).
4. Reinstall connector ensuring tabs are fully
locked in place.
5. Make sure the latest software has been loaded
to ensure all modules are compatible, refer to
Section 5.3.4
When a module is replaced, software
should be upgraded before switching the
unit on. This will ensure software com-
patibility of all modules.
6. Start unit and run Pretrip to check operation.
8.10.5 Alternator
!
Observe proper polarity when installing
battery. Negative battery terminal must
be grounded. Reverse polarity will
destroy the rectifier diodes in alternator.
As a precautionary measure, disconnect
the negative and then the positive battery
terminal when charging battery in unit.
8–45
CAUTION
62-11637