Page 1342. Disconnect the C3 Connector.3. Set a VOM to measure DC voltage.4. Connect the positive (+) test lead to Wire 56 (Pin 1) ofC3 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. Whilecranking, battery voltage should be measured. If batteryvoltage was not measured, verify continuity of Wire0 between C3 Connector and a clean frame ground.Verify continuity of Wire 56 between the C3 Connectorand Wire 56 connector and J2 Connector Pin LocationJ2-11. 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) ofC3 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 wirecontinuity is good, replace the printed circuit board.2. If Choke Solenoid coil resistance is not measured inStep 8, replace the Choke Solenoid.3. If battery voltage was not measured in Step 4, replacethe printed circuit board.teSt 70 – check For iGnition SparkDISCUSSION:If the engine cranks but will not start, perhaps anignition system failure has occurred. A special “sparktester” 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 enginecylinder head.3. Attach the spark plug lead to the spark tester terminal.4. Crank the engine while observing the spark tester. Ifspark jumps the tester gap, you may assume the engineignition system is operating satisfactorily.note: the engine flywheel must rotate at 350 rpm(or higher) to obtain a good test of the solid stateignition system.crank cycle sequence table1=CHOkED0=OPEN Note: the first second of each crank cycle is equal to two (2) revolutions of the engine.Secondscrank cycle 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1610 kW 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 012 kW-20 kW 0 1 1 0 0 1 1 1 0 0 0 1 1 1 1 1crank cycle 2 Seconds10 kW 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 012 kW-20 kW 0 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1crank cycle 3 Seconds10 kW 0 1 1 1 1 0 012 kW-20 kW 0 0 1 1 1 1 1crank cycle 4 Seconds10 kW 0 1 0 0 0 0 012 kW-20 kW 0 1 0 0 0 0 0crank cycle 5 Seconds10 kW 0 1 1 1 1 0 012 kW-20 kW 0 1 0 0 0 0 1Part 4 DC CONTROLsEctioN 4.4DiaGNostic tEsts0G9266revA.indd 134 10/15/2008 11:28:14 AM
