Guardian 4702, Repair Manual

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S Se ec cttiio on n 7 7
D DIIA AG GN NO OS ST TIIC C T TE ES ST TS S
ment of the SOLENOID PLUNGER. Adjust SOLENOID
PLUNGER movement until, with the carburetor CHOKE PLATE
closed, the CHOKE SOLENOID is bottomed in its coil (plunger
at full actuated position). With the CHOKE PLATE closed and
the plunger bottomed in its coil, tighten the two screws.
4. Disconnect Connector 1: Set the VOM to measure DC voltage.
Connect the positive (+) test lead to Wire 90 (Pin 2) of
Connector 1 going to the control panel. Connect the negative (-)
test lead to frame ground. Activate the Start-Stop Switch to
“START.” During cranking, battery voltage should be measured
cyclically every two seconds.
Figure 7-43. – Connector 1
5. If battery voltage was not measured in Step 4, check at J1
Connector: Connect positive (+) test lead to Pin Location J1-2
at the engine control board. Connect the negative (-) test lead
to frame ground. Activate the Start-Stop Switch to “START.”
During cranking, battery voltage should be measured cyclically
every two seconds.
6. Set the VOM to measure resistance. Disconnect Connector 1
from the Choke Solenoid. Connect one test lead to Wire 0 (Pin
1) of Connector 1, going to the control panel. Connect the other
test lead to frame ground. “Continuity” should be measured.
7. Set the VOM to measure resistance. Disconnect Connector 1.
Connect one meter test lead to Wire 90 (Connector 1, Pin 2)
going to the Choke Solenoid. Connect the other meter test lead
to Wire 0 (Connector 1, Pin 1). Approximately 3.7 ohms should
be measured. (Current draw of Choke Solenoid at nominal volt-
age is 3.4 amps).
Short to Ground:
8. Set the VOM to measure resistance. Disconnect Connector 1.
Connect one meter test lead to Wire 90 (Connector 1, Pin 2).
Connect the other meter test lead to the metal Choke Solenoid
housing. “Infinity” should be measured. If “Continuity” is mea-
sured, a short to ground exists.
RESULTS:
1. If Choke operation is good, go to Test 35 for Problem 7,
“Engine Cranks but Won’t Start” (Section 6). Go to Test 41 for
Problem 8, “Engine Starts Hard and Runs Rough”.
2. If battery voltage was measured in Step 5 but not measured in
Step 4, repair or replace Wire 90 between Engine Control
Board (ECB) and Connector 1.
3. If battery voltage is not measured in Step 5 during engine
cranking, replace Engine Control Board.
4. If “Continuity” is not measured in Step 6, repair or replace Wire
0 between the ground terminal and Connector 1.
5. If Choke Solenoid coil resistance is not measured or is incor-
rect in Step 7, replace the Choke Solenoid.
Figure 7-44. – Exploded View of Choke Assembly
Figure 7-45. – Automatic Choke Assembly
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