Page 269 - 05. Subyek Teknik Mesin - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

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Engine systems 253

Figure 2.343 Electrical warning sign and insulated gloves

Figure 2.344 Hybrid cars still use a normal 12 V battery

When maintenance procedures have to be interrupted while some high-voltage

components are uncovered or disassembled, make sure that:
the ignition is turned off and the key is removed
●
the battery module switch is switched off
●
no untrained persons have access to that area, and any unintended touching
●
of the components is prevented ( Fig. 2.344 ).
Before switching on the battery module after repairs have been completed, make
sure that:
all terminals have been tightened to the specifi ed torque
●
no high-voltage wires or terminals have been damaged or shorted to the body
●
( Fig. 2.345 )
the insulation resistance between each high-voltage terminal of the part you
●
disassembled and the vehicle’s body has been checked.
Working on hybrid vehicles is not dangerous IF the previous guidelines and
manufacturers’ procedures are followed. Before starting work, check the latest
information – DON’T take chances. Dying from an electrical shock is not funny.

2.7.2 Hybrids overview

A hybrid power system for an automobile can have a series, parallel or power
split confi guration ( Fig. 2.346 ). With a series system, an engine drives a generator,