Ignition System Maintenance Inspect Battery System Clean battery outer surfaces with a mixture of baking soda and water. Inspect battery outer surfaces for damage and replace as necessary. Remove battery cables and clean, repair and/or replace as necessary. Inspect Ignition System Remove and inspect the spark plugs. Replace as required. Inspect the ignition coil for cracks and heat deterioration. Visually inspect the coil heat sink fins. If any fins are broken replace as required. Inspection of Ignition Timing 1. Inspection condition Coolant temperature : 80-90°C(At normal Temperature) Lamp and all accessories : OFF Transmission : In neutral position Parking brake : ON 2.
Inspection 1) Connect the timing light. 2) Measure RPM. RPM 4) If ignition timing is out of the standard, inspect sensors concerned with ignition timing. Because ignition timing is fixed by set data value in ECU, it is impossible to control on purpose. (G643E Engine) Fist, check that sensors send output properly to help determine ignition timing control. NOTE: Affective ECU input to Ignition timing control Coolant temperature sensor Oxygen sensor Battery voltage MAP sensor (Engine load) Crankshaft position sensor Throttle position sensor Intake Air Temperature sensor 5) Check that actual ignition timing is changed with engine RPM increased. NOTE:
If RPM is not normal, it is impossible to measure the proper ignition timing, so measure it at a normal RPM. 3) Inspect the standard ignition timing. G643(E) Service Manual Chapter 2. Recommended Maintenance 24 CAUTION Low Idle 750±15 rpm G643E BTDC 19±5˚ G643 BTDC 0±5˚