2021 Mazda CX-3 AWDFACTORY OEM SERVICE PROCEDURE

Control System Device And Control Relationship Chart

x: Applicable

Item MAIN RELAY CONTROL DRIVE-BY-WIRE CONTROL HYDRAULIC VARIABLE VALVE TIMING CONTROL ELECTRIC VARIABLE VALVE TIMING CONTROL FUEL INJECTION CONTROL FUEL PUMP CONTROL HIGH PRESSURE FUEL PUMP CONTROL ELECTRONIC SPARK ADVANCE CONTROL PURGE CONTROL A/F SENSOR HEATER CONTROL HO2S HEATER CONTROL A/C CUT-OFF CONTROL ELECTRICAL FAN CONTROL STARTER CUT-OFF CONTROL GENERATOR CONTROL i-stop CONTROL DC-DC CONVERTER CONTROL ENGINE OIL CONTROL ENGINE OIL VARIABLE CONTROL WATER FLOW CONTROL
Input device
APP sensor No. 1, No. 2   x x   x     x x   x x     x        
TP sensor No. 1, No. 2   x     x           x       x        
MAF sensor   x x x x   x x x x   x     x   x    
IAT sensor No. 1   x   x x     x x     x   x x        
IAT sensor No. 2   x   x x     x             x        
MAP sensor   x   x x     x x           x   x    
CKP sensor   x x x x x x x x x x x x x x   x    
Intake CMP sensor   x x x x     x             x        
Exhaust CMP sensor   x x   x   x x             x        
ECT sensor   x x x x   x x x x x x x x x   x    
Fuel pressure sensor   x     x x x               x        
BARO sensor   x   x x       x     x     x        
Ion sensor No. 1-No. 4       x x                            
KS               x                      
A/F sensor         x       x                    
HO2S         x                            
Refrigerant pressure sensor                     x x              
IG1 relay x   x   x x   x   x   x x   x x      
Brake switch (No. 1 signal)   x                         x        
Brake switch (No. 2 signal)   x                                  
Transaxle range sensor (ATX)   x     x               x   x        
CPP switch (MTX)   x     x     x     x       x        
Starter interlock switch (MTX)                         x            
Neutral switch No. 1 (MTX)   x     x     x     x       x        
Electric variable valve timing motor/driver       x                     x        
Battery     x     x x x x         x x        
Generator (Stator coil)   x                                  
Engine oil temperature sensor (2)   x x x                           x x
Engine oil pressure sensor (2)                                   x  
Coolant control valve position sensor (2)                                     x
CAN (1)   x     x     x     x x x   x x      
Output device
Main relay x                                    
Throttle valve actuator   x                         x        
Electric variable valve timing motor/driver       x x                   x        
Electric variable valve timing relay       x                     x        
OCV     x                                
Fuel injector No. 1-No. 4         x                   x        
Fuel injector relay         x                   x        
Fuel pump control module           x                          
Fuel pump relay           x                          
Spill valve control solenoid valve (High pressure fuel pump)             x                        
Ignition coil No. 1-No. 4               x             x        
Purge solenoid valve                 x                    
A/F sensor heater                   x                  
HO2S heater                   x                  
A/C relay                     x                
Cooling fan relay No. 1, No. 2                       x              
Starter relay                         x   x        
Generator (Field coil)                           x x        
DC-DC converter                             x x      
Engine oil solenoid valve                                 x    
Coolant control valve (2)                                     x
(1) TCM (ATX), DSC HU/CM, instrument cluster, start stop unit

(2) With coolant control valve
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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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