2017 Mazda 5 GS, Automatic TransFACTORY OEM SERVICE PROCEDURE

No. 13 Knocking/Pinging-Acceleration/Cruise: Notes

NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE DESCRIPTION AND POSSIBLE CAUSE

13 KNOCKING/PINGING-ACCELERATION/CRUISE
DESCRIPTION
  • Sound is produced when air/fuel mixture is ignited by something other than spark plug (such as hot spot in combustion chamber).
POSSIBLE CAUSE
  • Engine overheating due to cooling system malfunction
  • ECT sensor malfunction
  • Erratic signal to PCM
  • IAT sensor malfunction
    • MAF sensor malfunction
  • PCM DTC is stored.
  • CMP signal malfunction
    • Loose installation CMP sensor and/or damaged pulse wheel
  • CKP signal malfunction
    • Loose installation CKP sensor and/or pulse wheel
  • Low engine compression
  • Excessive or insufficient fuel pressure
  • Fuel pump relay or fuel pump circuit malfunction
  • Restriction in fuel line
  • Pressure regulator malfunction (built-into fuel pump unit)
    • Fuel pump unit malfunction
  • KS malfunction
  • Improper ignition timing
  • Poor fuel quality (i.e. Fuel RON is not specified, excessive cleaning agents added in fuel.)
    WARNING:
    • The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system:
  • Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
    • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION .) (See AFTER SERVICE PRECAUTION .)
    CAUTION:
    • Disconnecting/connecting the quick release connector without cleaning it may cause damage to the fuel pipe and the quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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