P1310
Igniter Circuit Malfunction No. 3
What could P1310 mean for your vehicle?
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The P1310 code on Toyota vehicles indicates an igniter circuit malfunction for the No. 3 cylinder. This is essentially the same type of fault as P1300 but for a different cylinder. The ECM monitors the IGF (igniter feedback) signal from each coil pack to confirm that the ignition system is firing correctly. When the No. 3 coil's igniter doesn't send back the expected confirmation signal, this code is set.
Like P1300, this code is very often caused by a loose connector, particularly after engine service. If you recently had work done under the hood — spark plugs, valve cover gaskets, intake manifold, or even just a routine inspection — check that the No. 3 coil connector is firmly seated before doing anything else.
If the connector is secure, perform a coil swap test: move the No. 3 coil to another cylinder and clear the codes. If the fault follows the coil, replace it. If the fault stays on cylinder #3, the issue is in the wiring or spark plug. Toyota coil packs are inexpensive and readily available, and the swap takes just a few minutes on most engines. Be sure to also inspect the spark plug while the coil is out.
Severity
Symptoms
- •Check Engine Light illuminated
- •Engine misfires on cylinder #3
- •Loss of power under load
- •Rough idle or engine vibration
- •Engine may stumble during acceleration
- •Fuel economy noticeably worse
Likely Causes
The integrated ignition coil and igniter for cylinder #3 has failed. The coil's internal windings or igniter transistor have broken down due to heat and age.
A connector that wasn't fully locked after maintenance work is a very common cause. This is especially likely if the code appeared after spark plug or valve cover gasket service.
An excessively worn or oil-fouled spark plug increases the voltage demand on the coil, which can stress the igniter and trigger this code.
Damaged or corroded wires between the ECM and the No. 3 coil pack can cause intermittent or permanent loss of the igniter feedback signal.
The ECM's internal transistor controlling the No. 3 igniter circuit can fail, though this is the least common cause.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the No. 3 ignition coil with igniter
- Reseat or replace the coil connector
- Replace the spark plug in cylinder #3
- Inspect and repair wiring to the No. 3 coil
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