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Home >> Volkswagen >> 1991 >> Jetta L4-1781cc 1.8L SOHC >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Ignition Cable >> Testing and Inspection
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Ignition Cable: Testing and Inspection

PROCEDURE
- Remove spark plug wires (mark position at cap and plug).
- Check wires visually for cracks, rub marks, oil saturation and corrosion at terminals. Replace if needed.

Testing Spark Plug Wire:





- Measure overall resistance of each wire. Reading should be between:

4600 - 7400 ohms

- If reading is correct, plug wire is good.
- If reading is incorrect, measure resistance of spark plug connector only. Reading should be between:

4000 - 6000 ohms

- If reading is incorrect, replace and retest with new connector.

Connector Testing:





- Measure resistance of cap connector only. Reading should be between:

600 - 1400 ohms

- If reading is incorrect, replace and retest with new connector.
- If both wire connectors are within specifications, replace and retest with new wire.

NOTE: Ignition wire alone, without connector, should have continuity (approx. 0 ohm).

- Reinstall all ignition wires.