P1305 - FAULT CODE - OBD2

P1305 FORD: EGR CALIBRATION LOW

P1305 TOYOTA, LEXUS: IGNITER CIRCUIT MALFUNCTION NO. 2

The engines that use the DIS (Direct Ignition) system do not use rotary distributors to deliver ignition spark to the cylinders. As an alternative, they rely on signals from engine sensors, for example, the CKP (Crankshaft Position Sensor) or CMP (Camshaft Position Sensor). The PCM can set the best ignition timing with this information at any given load and engine speed. Ignition timing accuracy and a significant reduction in high voltage losses are achieved with the igniter, extending the life of these components.

The igniter sends a primary ignition signal to the cylinders that are connected via an ignition coil. The PCM calculates the accurate time at which this primary ignition signal should be delivered. Once the igniter receives it, it transmits it to the primary winding of the coil for the appropriate cylinder. The igniter's power transistors interrupt the signal to create a high voltage in the secondary winding of the coil.

Although this is the voltage that produces the spark to ignite the air-fuel mixture, the PCM requires the voltage that produces the ignition for that cylinder, so the igniter provides an Ignition Feedback (IGF) signal after the primary signal has been interrupted. The PCM continuously monitors this signal for all cylinders. In case the IGF signal is not present or not adequate, the P1305 OBD2 diagnostic code will be set.

• Check Engine light ON.
• Significant increase in fuel consumption.
• The engine loses power.
• The engine stops unexpectedly.
• Unstable idle.
• Other misfire-related error codes are set.

Reasons for setting the P1305 OBDII fault code are as follows:

• The connectors or wires in the cigarette lighter circuit may be damaged.
• An ignition coil could be bad.
• The cigarette lighter may be malfunctioning.