Mazda MX-5 Miata / Grand Touring. Manual — part 124

Fig. 42: Identifying Fuel Injector Terminals A & B Using Tester
Courtesy of MAZDA MOTORS CORP.

CIRCUIT OPEN/SHORT INSPECTION

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [LF] .)

2. Inspect the following wiring harnesses for open or short circuit (continuity check).

Fig. 43: Identifying Fuel Injector Connector & PCM Connector Terminal
Courtesy of MAZDA MOTORS CORP.

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE Fuel System - MX-5 Miata

Open Circuit



If there is no continuity, there is an open circuit. Repair or replace the wiring harness.



Fuel injector No.1 terminal B and PCM terminal 2BB



Fuel injector No.2 terminal B and PCM terminal 2BC



Fuel injector No.3 terminal B and PCM terminal 2BD



Fuel injector No.4 terminal B and PCM terminal 2AZ



Fuel injector No.1 terminal A and main relay



Fuel injector No.2 terminal A and main relay



Fuel injector No.3 terminal A and main relay



Fuel injector No.4 terminal A and main relay

Short Circuit



If there is continuity, there is a short circuit. Repair or replace the wiring harness.



Fuel injector No.1 terminal B and body ground



Fuel injector No.1 terminal B and power supply



Fuel injector No.2 terminal B and body ground



Fuel injector No.2 terminal B and power supply



Fuel injector No.3 terminal B and body ground



Fuel injector No.3 terminal B and power supply



Fuel injector No.4 terminal B and body ground



Fuel injector No.4 terminal B and power supply



Fuel injector No.1 terminal A and body ground



Fuel injector No.2 terminal A and body ground



Fuel injector No.3 terminal A and body ground



Fuel injector No.4 terminal A and body ground

LEAKAGE INSPECTION

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel

from spilling from the fuel system. (See BEFORE SERVICE PRECAUTION [LF] .)

2. Remove the battery cover.

3. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF] .)

4. Remove the fuel injector and fuel distributor as a single unit. (See FUEL INJECTOR

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.

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE Fuel System - MX-5 Miata

REMOVAL/INSTALLATION [LF] .)

5. Fix the fuel injector to the fuel distributor with a wire or the equivalent.

Fig. 44: Fixing Fuel Injector To Fuel Distributor With Wire
Courtesy of MAZDA MOTORS CORP.

6. Connect the fuel hose.

7. Start the fuel pump using the following procedure:

Using M-MDS

1. Connect the negative battery cable.

2. Connect the M-MDS to the DLC-2.

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE Fuel System - MX-5 Miata

Fig. 45: Locating DLC-2 Connector
Courtesy of MAZDA MOTORS CORP.

3. Start the fuel pump using the "FP" simulation function.

Not using M-MDS

1. Short the check connector terminal F/P to ground using a jumper wire.

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE Fuel System - MX-5 Miata