Toro Groundsmaster 4500-D Series Service Manual page 333

Toro Electronic Controllers (TEC) (continued)
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
When testing for wire harness continuity at the connector for the
TEC controller, take care to not damage the connector pins with
multimeter test leads. If connector pins are enlarged or damaged
during testing, connector repair will be necessary for proper
machine operation.
The machine electrical schematic and wire harness drawings in Chapter 9 −
Foldout Drawings can be used to identify possible circuit problems between the
controllers and the input/output devices (e.g. switches and solenoid coils).
Because of the solid state circuitry built into the TEC controllers, there is no
method to test a controller directly. A controller may be damaged if an attempt is
made to test it with an electrical test device (e.g. digital multimeter or test light).
Note: The two (2) TEC controllers used on the Groundsmaster 4700−D are
matched for correct machine operation. If either of these components are
replaced for any reason, system software needs to be reprogrammed by your
Toro Distributor.
Before performing welding on the machine, disconnect both positive
and negative battery cables from the battery, disconnect the wire
harness connector from the TEC controllers and disconnect the
terminal connector from the alternator. Also, disconnect and remove
the engine ECU from the machine before welding. These steps will
prevent damage to the machine electrical system when welding.
g321413
1. TEC controller
2. Machine harness connector
If the wire harness connector is removed from the TEC controller for any reason,
tighten the harness connector screw from 2.8 to 3.2 N·m (25 to 28 in-lb).
IMPORTANT
IMPORTANT
Figure 213
3. Socket head screw
Page 6–51 Electrical System: Component Testing