Engine-Codes - Lexus - P1315 LEXUS

P1315 LEXUS - Igniter Circuit Malfunction No. 4

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P1315 LEXUS Possible Causes

  • Faulty Ignition Coil No. 4
  • Ignition Coil No. 4 harness is open or shorted
  • Ignition Coil No. 4 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How is the P1315 LEXUS code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P1315 LEXUS code

Labor: 1.0

The cost to diagnose the P1315 LEXUS code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected?

The P1315 code is for the ignition coil No.4 and is set when there is no IGF signal to the ECM during engine operation.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1315 LEXUS Meaning

Direct Ignition System (DIS) is a 1-cylinder ignition system that ignites one cylinder with one ignition coil. Ignitor is integral to ignition coil. The Engine Control Module (ECM) determines ignition timing and outputs a ignition signal (IGT) for each cylinder. Based on the IGT signals, power transistors in the ignitor cut of current to primary coil in ignition coil, causing ignition coil to fire spark plug. After delivering a command to turn off primary circuit on the IGT wire, ECM monitors IGF circuit to ensure primary switching occurred.

More Information

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