Figure 38-32. With a liquid system, disconnect the hoses
and wires going to the pump motor before replacement.
Servicing the Motor-Generator
Normally, the motor-generator is trouble free.
However, if the hybrid vehicle is hit by lightning or used
for an extended period, the motor-generator can fail. The
coil windings in the unit can short or burn open, reducing
motor-generator performance. A scan tool will retrieve
trouble codes relating to the motor-generator. The instru-
ment panel combination meter will also indicate poor
electrical drive performance during all-electric (motor-
generator driven) acceleration and regenerative braking.
When replacing a motor-generator, refer to service
manual for specific instructions, since part locations and
procedures vary from one make to another. The most
common motor-generator design requires you to remove
the transaxle or transmission to access the motor-gener-
ator assembly.
Figure 38-33 outlines the major steps for removing a
motor-generator from one particular specific vehicle.
After removing the flex plate, a plastic sleeve is installed
between the armature and stator to hold them apart
Chapter 38 Hybrid Drive System Operation and Repair 717
Figure 38-32. The air cooling system for the battery pack and
power control module is serviced in the same way as a climate
control fan and wiring. After removing the cover, ducts, and fas-
teners, the blower motor assembly can be removed for
replacement. (Toyota)
Blower
Figure 38-31. This dc-to-dc converter is a discrete unit. It mounts in engine compartment on firewall of vehicle. (Ford)
Low-voltage
battery
cable nuts
DC/DC
converter
electrical
connector
DC/DC
converter assembly