What causes P1311 on a Honda?

Failing ignition control module dropping the circuit 1 secondary signal Open or shorted coil secondary signal wire for circuit 1 Corroded distributor or ICM connector pins Failing ignition coil with a breaking-down secondary winding Heat-soaked ICM losing the signal only when hot

How do I fix P1311 on a Honda?

Check for spark quality on the affected cylinders with a spark tester Inspect the ICM and distributor connectors for corrosion and heat damage Test the coil primary and secondary resistance against spec hot and cold Scope the ICM secondary signal on circuit 1 and compare to circuit 2 Replace the ICM or coil per the scope trace, not on suspicion

P1311 Ignition Control Module Ignition Coil Secondary Signal Circuit 1

Q: What does P1311 mean on a Honda?

P1311 — Ignition Control Module Ignition Coil Secondary Signal Circuit 1. Applies to Civic, Accord, Prelude with distributor ignition.

Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: Civic, Accord, Prelude with distributor ignition

What does P1311 mean on a Honda?

P1311 — Ignition Control Module Ignition Coil Secondary Signal Circuit 1. This Honda-enhanced code applies to Civic, Accord, Prelude with distributor ignition.

Common causes of P1311

Failing ignition control module dropping the circuit 1 secondary signal
Open or shorted coil secondary signal wire for circuit 1
Corroded distributor or ICM connector pins
Failing ignition coil with a breaking-down secondary winding
Heat-soaked ICM losing the signal only when hot

How to fix P1311

Check for spark quality on the affected cylinders with a spark tester
Inspect the ICM and distributor connectors for corrosion and heat damage
Test the coil primary and secondary resistance against spec hot and cold
Scope the ICM secondary signal on circuit 1 and compare to circuit 2
Replace the ICM or coil per the scope trace, not on suspicion