What is the ignition coil primary winding resistance specification?

1.0 – 1.3 Ω measured at 20°C (68°F) across the positive and negative primary winding terminals.

What is the secondary winding resistance specification for the ignition coil?

7,300 – 11,000 Ω at 20°C (68°F), measured between the secondary winding terminal and the primary winding negative terminal.

What insulation resistance should the distributor cap and rotor have?

More than 50 MΩ between electrodes on the ignition coil and side of the spark plug. If less than the specified value, replace.

How do you check the vacuum advance on the distributor?

Connect a vacuum pump to the vacuum controller and gradually draw a vacuum while watching breaker plate movement, checking for smooth operation with no binding; then turn the breaker plate right and left to check for freedom of movement.

When should the ignition coil be replaced?

Resistance varies with coil temperature; replace the coil if the resistance reading is outside the specified limits.

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Nissan Micra Distributor Test: Ignition Coil Resistance & Vacuum Advance Check

Nissan ignition coil resistance and vacuum advance test procedure EL-35

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Ignition system service page: how to measure coil primary winding (1.0-1.3 ohm) and secondary winding (7,300-11,000 ohm) resistance, check cap/rotor insulation, and test distributor vacuum advance.

AI caption February 2006 · Photo 381 of 412

This is page EL-35 from a Nissan factory service manual covering the ignition system distributor. It provides three inspection procedures. First, Ignition Coil Resistance: using an ohmmeter, measure primary winding resistance across the positive and negative primary terminals (specification 1.0–1.3 Ω at 20°C/68°F), and secondary winding resistance between the secondary terminal and the primary negative terminal (specification 7,300–11,000 Ω at 20°C/68°F). The page notes resistance varies with coil temperature and the coil should be replaced if readings fall outside limits. A handwritten owner note dated Nov. 19th 2004 records a reading of 2.1 at approximately −4°C. Second, Cap and Rotor Head: check for dust, carbon deposits and cracks, and measure insulation resistance between electrodes on the ignition coil and side of the spark plug — specification more than 50 MΩ; replace if below the specified value. Third, Check Vacuum Advance: connect a vacuum pump to the vacuum controller, gradually draw a vacuum while watching breaker plate movement for smooth, non-binding operation, then turn the breaker plate right and left to verify freedom of movement. Illustrations (EE567, SEL104, SEL656B, SEL776D) show test connections for each procedure.

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Frequently asked questions

What is the ignition coil primary winding resistance specification?: 1.0 – 1.3 Ω measured at 20°C (68°F) across the positive and negative primary winding terminals.
What is the secondary winding resistance specification for the ignition coil?: 7,300 – 11,000 Ω at 20°C (68°F), measured between the secondary winding terminal and the primary winding negative terminal.
What insulation resistance should the distributor cap and rotor have?: More than 50 MΩ between electrodes on the ignition coil and side of the spark plug. If less than the specified value, replace.
How do you check the vacuum advance on the distributor?: Connect a vacuum pump to the vacuum controller and gradually draw a vacuum while watching breaker plate movement, checking for smooth operation with no binding; then turn the breaker plate right and left to check for freedom of movement.
When should the ignition coil be replaced?: Resistance varies with coil temperature; replace the coil if the resistance reading is outside the specified limits.