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Page 134
2. Disconnect the C3 Connector.
3. Set a VOM to measure DC voltage.
4. Connect the positive (+) test lead to Wire 56 (Pin 1) of
C3 Connector going to the control panel (Female Side)
Connect the negative (-) test lead to Wire 0 (Pin 2).
5. Set the AUTO-OFF-MANUAL Switch to MANUAL. While
cranking, battery voltage should be measured. If battery
voltage was not measured, verify continuity of Wire
0 between C3 Connector and a clean frame ground.
Verify continuity of Wire 56 between the C3 Connector
and Wire 56 connector and J2 Connector Pin Location
J2-11. Repair or replace any wiring as needed.
6. Disconnect C3 Connector.
7. Set a VOM to measure resistance.
8. Connect the positive (+) test lead to Wire 56 (Pin 1) of
C3 Connector going to the choke solenoid (Male Side).
Connect the negative (-) test lead to Wire 0 (Pin 2).
Approximately 3.7 ohms should be measured.
RESULTS:
1. If Battery voltage was not measured in Step 5 and wire
continuity is good, replace the printed circuit board.
2. If Choke Solenoid coil resistance is not measured in
Step 8, replace the Choke Solenoid.
3. If battery voltage was not measured in Step 4, replace
the printed circuit board.
TEST 70 – CHECK FOR IGNITION SPARK
DISCUSSION:
If the engine cranks but will not start, perhaps an
ignition system failure has occurred. A special “spark
tester” can be used to check for ignition spark.
PROCEDURE:
1. Remove spark plug leads from the spark plugs
(Figure 28).
2. Attach the clamp of the spark tester to the engine
cylinder head.
3. Attach the spark plug lead to the spark tester terminal.
4. Crank the engine while observing the spark tester. If
spark jumps the tester gap, you may assume the engine
ignition system is operating satisfactorily.
NOTE: The engine flywheel must rotate at 350 rpm
(or higher) to obtain a good test of the solid state
ignition system.
Crank Cycle Sequence Table
1=CHOKED
0=OPEN
Note: The first second of each crank cycle is equal to two (2) revolutions of the engine.
Seconds
Crank Cycle 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
10 kW 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 0
12 kW-20 kW 0 1 1 0 0 1 1 1 0 0 0 1 1 1 1 1
Crank Cycle 2
Seconds
10 kW 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 0
12 kW-20 kW 0 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1
Crank Cycle 3
Seconds
10 kW 0 1 1 1 1 0 0
12 kW-20 kW 0 0 1 1 1 1 1
Crank Cycle 4
Seconds
10 kW 0 1 0 0 0 0 0
12 kW-20 kW 0 1 0 0 0 0 0
Crank Cycle 5
Seconds
10 kW 0 1 1 1 1 0 0
12 kW-20 kW 0 1 0 0 0 0 1
PART 4
DC CONTROL
SECTION 4.4
DIAGNOSTIC TESTS