Glow Plug Controller - Toro Workman MDX-D Service Manual

Glow Plug Controller

The glow plug controller is attached to the front of the
dash bracket and can be accessed by raising the hood
(Fig. 21).
NOTE: When troubleshooting the glow controller, refer
to electrical drawings in Chapter 7 -- Electrical Drawings.
Glow Plug Controller Operation
1. When the ignition switch is initially placed in the ON
position, the glow plug controller energizes the glow
plugs for six (6) seconds. The console glow plug indica-
tor light will also be illuminated for six (6) seconds.
2. When the ignition switch is turned to the START posi-
tion, the glow plugs will energize as long as the switch
is held in START. The console glow plug indicator light
will not be illuminated.
3. When the ignition switch is released from the START
to the ON position, the glow plugs will de--energize and
the console glow plug indicator light will remain off.
Glow Plug Controller Checks
1. Make sure there is electrical power from the battery.
2. Disconnect the wire harness electrical connector
from the engine run solenoid to prevent the engine from
starting (see Engine Run Solenoid in this section).
3. Place ignition switch in the ON position. Verify the fol-
lowing while in the ON position:
A. Glow plug indicator light is illuminated.
B. Glow relay is energized.
C. Glow plugs are energized.
D. Glow plug indicator light goes out and glow plugs
de--energize after approximately six (6) seconds.
4. Place ignition switch in the START position. Verify
the following while in the START position:
A. Glow plug indicator light is not illuminated.
B. Glow relay is energized.
C. Glow plugs are energized.
D. Electrical power exists at terminal 1 of the glow
plug controller.
NOTE: If there is no electrical power at terminal 1 of the
glow plug controller, verify continuity of the circuitry from
the ignition switch to the controller and perform Step 4
again (see Chapter 7 -- Electrical Drawings).
Electrical System
5. If any of the conditions in Step 3 are not met or electri-
cal power to controller terminal 1 exists and any of the
other conditions in Step 4 are not met:
A. Verify continuity of the circuitry from the battery to
the glow relay and glow plugs (see Chapter 7 -- Elec-
trical Drawings).
B. Verify continuity of the circuitry from the battery to
ignition switch, glow plug controller, glow plug indica-
tor light, glow relay and ground (see Chapter 7 --
Electrical Drawings).
C. Repair or replace components as necessary.
6. After testing is completed, connect wire harness
electrical connector to the engine run solenoid.
1
1. Glow plug controller
1
VIOLET
ORANGE
PINK
1. Controller top view
Page 5 - - 16
Figure 21
2. Wire harness
CONTROLLER
CONNECTIONS
1 4 TEMP (not used)
START
LAMP 2 5 GLOW
6 GROUND
+12V 3
Figure 22
2. Controller end view
Workman MDX--D
2
3 6
2 5
1 4
2
GRAY
BLACK