Injection Volume Inspection

WARNING:

Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can ignite and cause serious injury or death and damage. To prevent this, complete the following inspection with the engine stopped.

Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See BEFORE SERVICE PRECAUTION .)
Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION [L3] .)
Disconnect the negative battery cable.
Remove the PCM. (See PCM REMOVAL/INSTALLATION .)
Connect the PCM connector.
Remove the fuel injector and fuel distributor as a single unit. (See FUEL INJECTOR REMOVAL/INSTALLATION .)
Fix the fuel injector to the fuel distributor with a wire or the equivalent.
Connect the corresponding fuel injector connector.
Connect the negative battery cable.

Fig 1: Inspecting Injection Volume
Courtesy of MAZDA MOTORS CORP.
Ground the following PCM terminal 1BG using a jumper wire.
Turn the ignition switch to the ON position to start the fuel pump.

Fig 2: PCM Connector Terminal Identification
Courtesy of MAZDA MOTORS CORP.

Ground the following PCM terminals using a jumper wire and measure the injection volume of each fuel injector.

If not within the specification, replace the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION .)

Injection volume

275-312 ml {275-312 cc, 16.8-19.0 cu in}/min

TERMINALS REFERENCE

Fig 3: PCM Connector Terminal Identification

Courtesy of MAZDA MOTORS CORP.

Turn the ignition switch to the LOCK position to stop the fuel pump and disconnect the jumper wire.
Remove the wire or equivalent securing the fuel injector.
Install the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION .)
Inspect all related parts by performing "AFTER SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTION .)