Procedure

WARNING
High-voltage ignition system--proceed with caution. Never touch the [1][2]ignition discharge module when the starter is running or during filament burn-off (when turning the ignition key to OFF). The high voltages present can be fatal to people with weak hearts or pacemaker implants.

Before starting work, determine the fault symptoms described by the customer.

Most problems are caused by one of the following faults. Always check for these first and rectify them, as necessary, before starting any additional diagnosis work. After each fault has been rectified, check to see whether the fault symptoms are still there.

^ Module connections (both inside the module and in the electrical circuit)

- Check for poor contact caused by bent, corroded or damaged connector pins. Also check the power supply, ground, trigger signals and detector signals.

^ Spark plugs

- Correct type

- Correct electrode gap (a faulty gap setting can cause the engine to miss when under a light or partial load, to misfire on idling or to be rough running at high rpm)

- Check for signs of damage to the insulator (damage can lead to arcing during increasing engine load)

^ Ignition shroud

- Check for arcing due to damage or electrical leakage (check using test spark plug)

- Check for damaged rubber seals (often caused by chafing between the plug and the rubber)

- Check that the springs are in place in the coils and correctly seated.

If no faults are detected or if the fault symptoms persist, continue the diagnostic work by fitting the test module.

If the fault symptoms disappear when the test module is fitted, the standard [1][2]ignition discharge module is defective and should be replaced.

If the symptoms still persist, continue diagnosis as specified under "Trionic engine-management system".