Fuel Charging Wiring Harness Removal/Installation - 2.3L

Disconnect the negative battery cable.
Remove the upper intake manifold. See INTAKE MANIFOLD REMOVAL/INSTALLATION - 2.3L .
Disconnect the mass airflow sensor electrical connector.

Fig 1: Disconnecting Mass Airflow Sensor Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the right side of the wiring harness from the engine.

Fig 2: Disconnecting Right Side Of Wiring Harness From Engine
Courtesy of MAZDA MOTORS CORP.
Detach the cylinder head temperature (CHT) sensor boot.

Fig 3: Detaching Cylinder Head Temperature (CHT) Sensor Boot
Courtesy of MAZDA MOTORS CORP.
Disconnect the CHT sensor electrical connector.

Fig 4: Disconnecting CHT Sensor Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the PCM connector and the wiring harness clamp.

Fig 5: Disconnecting PCM Connector And Wiring Harness Clamp - With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Disconnect the PCM ground wire.

Fig 6: Disconnecting PCM Ground Wire - With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Disconnect the ignition coil assembly electrical connector.

Fig 7: Disconnecting Ignition Coil Assembly Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the water temperature sensor electrical connector.

Fig 8: Disconnecting Water Temperature Sensor Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the electric EGR (EEGR) valve electrical connector.

Fig 9: Disconnecting Electric EGR (EEGR) Valve Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the camshaft position (CMP) sensor electrical connector.

Fig 10: Disconnecting Camshaft Position (CMP) Sensor Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the fuel injectors.

Fig 11: Disconnecting Fuel Injectors
Courtesy of MAZDA MOTORS CORP.
Disconnect the fuel injector wiring from the fuel rail.

Fig 12: Disconnecting Fuel Injector Wiring From Fuel Rail
Courtesy of MAZDA MOTORS CORP.
Disconnect the heated oxygen sensor (HO2S) electrical connector and detach the connector from the bracket.

Fig 13: Disconnecting Heated Oxygen Sensor (HO2S) Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the transmission wiring harness.

Fig 14: Disconnecting Transmission Wiring Harness
Courtesy of MAZDA MOTORS CORP.
Disconnect the thermostat housing electrical connector.

Fig 15: Disconnecting Thermostat Housing Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the power steering pressure (PSP) switch electrical connector.

Fig 16: Disconnecting Power Steering Pressure (PSP) Switch Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the crankshaft position (CKP) sensor wiring from the front cover.

Fig 17: Disconnecting Crankshaft Position (CKP) Sensor Wiring From Front Cover
Courtesy of MAZDA MOTORS CORP.
Disconnect the crankshaft position (CKP) sensor electrical connector and the wiring from the front cover.

Fig 18: Disconnecting Crankshaft Position (CKP) Sensor Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Remove the engine wiring harness from the engine compartment.
To install, reverse the removal procedure.