Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2021 Mazda CX-3 AWDFACTORY OEM SERVICE PROCEDURE

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

13

KNOCKING/PINGING-ACCELERATION/CRUISE

DESCRIPTION

Abnormal combustion occurs under the condition such as the temperature in the combustion chamber is too high resulting in abnormal noise.
Knocking sound occurs from the engine room during acceleration.

POSSIBLE CAUSE

Poor fuel quality
- Fuel RON is not specified
  - Excessive cleaning agents added in fuel

Poor connection of KS, wiring harness
The following information for calculating ignition timing is incorrect:
- KS signal
- ECT sensor No. 1 signal
- IAT sensor No. 2 (integrated in MAP sensor) signal
- MAF sensor signal
  - Air suction in intake-air system
- MAP sensor signal

Combustion temperature is high
- Cooling system malfunction
- Carbon accumulation
  - Use of non-genuine spark plug
WARNING:
The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
- 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 injury 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 Repair Information. (See BEFORE SERVICE PRECAUTION .) (See AFTER SERVICE PRECAUTION .)
CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

Factory Service Tools

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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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