Technical Service Bulletin 01-001-21-3761a — 2018 MAZDA CX-9
ENGINE AND ENGINE COOLING
Bulletin Details
| TSB ID | 01-001-21-3761a |
| Manufacturer | |
| Vehicle | 2018 MAZDA CX-9 |
| Component | ENGINE AND ENGINE COOLING |
| Communication Date |
Bulletin Summary
Some vehicles may exhibit an occasional rough idle accompanied with DTC P0300:00 (Random misfire) due to the following: 1. While closing the EGR valve, carbon deposit etc. pinched at the valve seat prevents the valve from closing completely. 2. The closed position of the EGR valve is learned improperly as it is not equipped with a position sensor. 3. While idling, the EGR gas improperly mixes with fresh air through the EGR valve that is not closed properly. 4. Misfire occurs. To eliminate this concern, the control software of the PCM has been modified (for service) to force the learning of the closed position of the EGR valve when a misfire is detected at idle.
About Technical Service Bulletins
A Technical Service Bulletin (TSB) is a document issued by a vehicle manufacturer to its dealers, describing a known issue with a specific vehicle or set of vehicles and the recommended procedure to fix it. Unlike recalls, TSBs are not mandatory and are typically only performed if an owner reports the related issue. However, TSBs can be an indicator of common problems with a vehicle.
Other TSBs for the 2018 MAZDA CX-9
SA-052-25
ENGINE
CSP12 Repair
ENGINE
05-002-23
POWER TRAIN
09-013-23a
ELECTRICAL SYSTEM
SA-001-22b
ELECTRICAL SYSTEM:SOFTWARE
07-001/22
ELECTRICAL SYSTEM:WIRING:SWITCHES/KNOBS/BUTTONS
09-030-21-3838
ENGINE AND ENGINE COOLING:ENGINE:HARD PARTS INTERNAL/MECHANICAL
09-023-21-3820
EQUIPMENT
09-017-21-3808
EQUIPMENT ADAPTIVE/MOBILITY
MT-003-21
VISIBILITY:POWER WINDOW DEVICES AND CONTROLS