Fuel Charging Wiring Harness Removal / Installation - 2.3L

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

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

Fig 2: Wiring Harness Retainers
Courtesy of MAZDA MOTORS CORP.
Detach the cylinder head temperature (CHT) sensor boot.

Fig 3: Identifying Cylinder Head Temperature 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 powertrain control module (PCM) connector and the wiring harness clamp.

Fig 5: Disconnecting Powertrain Control Module Connector And Wiring Harness Clamp
Courtesy of MAZDA MOTORS CORP.
Disconnect the PCM ground wire.

Fig 6: Disconnecting PCM Ground Wire
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 exhaust gas recirculation (EGR) (EEGR) valve electrical connector.

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

Fig 10: Disconnecting Camshaft Position 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 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 Switch Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the crankshaft position (CKP) sensor wiring from the front cover.

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

Fig 18: Identifying CKP Sensor Electrical Connector And Wiring From Front Cover
Courtesy of MAZDA MOTORS CORP.
Remove the engine wiring harness from the engine compartment.
To install, reverse the removal procedure.