Service manual

90-898303 2-24

2.4L & 2.5L - Troubleshooting Tips

1) Intermittent, weak or no spark output at 2 spark plugs (one plug from each

bank of three cylinders) usually is caused by a bad TRIGGER.

2) A SWITCH BOX can also cause 2 cylinders (1 each bank) to lose spark.

3) Intermittent, weak or no spark output at 3 spark plugs (a complete bank of

3 cylinders) usually is caused by a bad STATOR or SWITCH BOX.

4) An IDLE STABILIZER/ADVANCE MODULE can also cause 3 cylinders on

1 bank to lose spark.

5) Intermittent, weak or no spark output at any one spark plug (single

cylinder) usually is a bad COIL or SWITCH BOX.

6) Loss of spark to 1 cylinder could also be caused by a loose or broken

PRIMARY LEAD between the switch box and ignition coil or a broken or

loose GROUND lead between the ignition coil and engine ground.

7) To more easily troubleshoot high speed ignition problems, it is

recommended that test harness 91-14443A1 be installed on outboard.

This long harness allows the mechanic to remain at the driver’s seat while

checking primary voltage, stator voltage, trigger voltage and bias voltage.

a) Plug into Meter

b) Attach to Appropriate Terminals

c) Attach to engine ground

d) Selector Switch

8) A heat gun, hair dryer or heat lamp can be used to warm electrical

components up (to find a short); or components can be place in a

refrigerator to cool them down (to find an open).Resistance values will

change as a component is heated or cooled. However, the resistance

change should not be drastic as in a short or open unless the component

is defective.

NOTE: If using a heat device to warm electrical components, maximum

temperature electrical components can be heated to without damage is 311 F°

(155 C°).

Notes

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