P1288 MAZDA Code Possible Causes
- Faulty thermostat
- Not within operating range
- Engine overheated
- Low coolant level
- Defective cylinder head temperature (CHT) sensor
- Cylinder head temperature sensor wiring open or shorted
- Poor electrical connection in the cylinder head temperature sensor circuit
How is the P1288 MAZDA Code Repaired?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P1288 MAZDA Code Tech Notes
This indicates that the cylinder head temperature (CHT) sensor is out of the self-test range. The engine is not at normal operating temperature.
When is the P1288 MAZDA Code Detected?
The P1288 code is set if the engine reaches a critical temperature.
What are the Possible Symptoms of the MAZDA P1288 Code?
- Check engine light on (or Service Engine Soon warning light)
What Does the P1288 MAZDA Code Mean?
The cylinder head temperature (CHT) sensor is mounted in the cylinder head wall and is not connected to any coolant passages. The CHT sends a signal to the Powertrain Control Module (PCM) indicating the cylinder head temperature. If the temperature exceeds 126°C (258°F), the PCM shuts off four fuel injectors at a time. The PCM will alternate the four disabled injectors every 32 engine cycles. The four cylinders that are not injected with fuel act as air pumps to help cool the engine. If the temperature exceeds 154°C (310°F), the PCM shuts off all fuel injectors until the engine temperature drops below 154°C (310°F).