P1315 Igniter Circuit Malfunction No 4

• OBD2 Code: P1315
  
  Description: Igniter Circuit Malfunction No 4
  
  Definition: This code indicates a malfunction in the igniter circuit of cylinder number 4. The Engine Control Module (ECM) has detected an issue with the ignition coil or its circuitry, which may lead to misfires or poor engine performance.

p1315: Igniter Circuit Malfunction No 4

Typical Severity: Moderate

Common Causes

P1315 – Igniter Circuit Malfunction No. 4

Description: The OBD-II code P1315 indicates an issue with the igniter circuit for cylinder No. 4.

Common Causes:

• Faulty ignition coil
• Defective spark plug
• Poor electrical connection in the ignition system
• Issues with the engine control module (ECM)

 

Common Misdiagnosis

OBD2 Code: P1315

Description: Igniter Circuit Malfunction No. 4

Common Misdiagnosis: Replacing the ignition coil or spark plug without checking the wiring and connections in the igniter circuit.

 

Common Diagnostic Steps

OBD2 Code: P1315

Description: Igniter Circuit Malfunction No. 4

• Check the ignition coil and igniter for proper operation.
• Inspect the wiring and connectors between the Engine Control Module (ECM) and the igniter circuit for damage or corrosion.
• Test the voltage supply to the ignition coil and ensure it is within specifications.
• Use a multimeter to check for continuity in the igniter circuit.
• Examine related fuses and relays for any signs of failure.
• If applicable, use an oscilloscope to analyze waveform patterns from the ignition system components.
• Clear any stored codes after repairs are made and test drive to verify resolution of issue.