Fuel System (Lf 2.0L): Diagnosis Mazda MX-5 NC рестайлинг

Fuel Leakage Inspection

Scheme 4

1. Connect the M-MDS to the DLC-2.
2. Start the fuel pump using the "FP" simulation function of the M-MDS.
3. Verify that there is no fuel leakage from the pressurized parts. Standard There shall be no leakage after 5 min.
4. In the case of fuel leakage, replace the following components and then do the recheck by the fuel leakage checking procedure. If there is leakage, replace the fuel hoses and clips. If there is damage on the seal on the fuel pipe side, replace the fuel pipe.

Scheme 5

1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
3. Short the check connector terminal F/P to ground using a jumper wire.
4. Connect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
5. Turn the ignition switch to the ON position to operate the fuel pump.
6. Verify that there is no fuel leakage from the pressurized parts. Standard There shall be no leakage after 5 min.
7. In the case of fuel leakage, replace the following components and then do the recheck by the fuel leakage checking procedure. If there is leakage, replace the fuel hoses and clips. If there is damage on the seal on the fuel pipe side, replace the fuel pipe.

FUEL LINE PRESSURE INSPECTION [LF]

Scheme 6

Scheme 7

Scheme 8

Scheme 9

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See «BEFORE SERVICE PRECAUTION [LF]»(ref-430308-S13106615682011101700000) .)
2. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
3. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
4. Disconnect the quick release connector (in the engine compartment). (See «QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION [LF]»(ref-430308-S31748830442011101700000) .)
5. Turn the lever of the SST parallel to the hose as shown in the illustration.
6. Insert the SST quick release connector into the fuel pipe until a click is heard.
7. Verify that the quick release connector is firmly connected by pulling it by hand.
8. Start the fuel pump using the following procedure: Using M-MDS Connect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .) Connect the M-MDS to the DLC-2. Start the fuel pump using the "FP" simulation function of the M-MDS. Without using M-MDS Short the check connector terminal F/P to ground using a jumper wire. Turn the ignition switch to the ON position to operate the fuel pump.
9. Operate the fuel pump for 10 s.
10. Measure the fuel line pressure. If not within the specification, inspect the following: If it less than the specification: Fuel pump unit Fuel line for clogging or leakage If it exceeds the specification: Fuel line clogging Fuel pressure (Reference) 375-450 kPa {3.83-4.58 kgf/cm 2 , 54.4-65.2 psi}
11. Stop the fuel pump using the following procedure: Using M-MDS Stop the fuel pump using the "FP" simulation function of the M-MDS. Without using M-MDS Turn the ignition switch to off to stop the fuel pump.
12. Measure the fuel hold pressure after 5 min . If not within the specification, inspect the following: Fuel line leakage Fuel hold pressure (Reference) 200 kPa {2.04 kgf/cm 2 , 29.0 psi} or more
13. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See «BEFORE SERVICE PRECAUTION [LF]»(ref-430308-S13106615682011101700000) .)
14. Disconnect the SST .
15. Connect the quick release connector to the fuel distributor. (See «QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION [LF]»(ref-430308-S31748830442011101700000) .)
16. Complete the "AFTER SERVICE PRECAUTION". (See «AFTER SERVICE PRECAUTION [LF]»(ref-430308-S11387419382011101700000) .)

FUEL TANK INSPECTION [LF]

Note. The two rollover valves built into the fuel tank and check valves (two-way) built into the rollover valves are inspected in this inspection.

Scheme 10

Scheme 11

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See «BEFORE SERVICE PRECAUTION [LF]»(ref-430308-S13106615682011101700000) .)
2. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
3. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
4. Remove the fuel tank with the fuel pump unit. (See «FUEL TANK REMOVAL/INSTALLATION [LF]»(ref-430308-S33899718022011101700000) .)
5. Perform the following procedure to verify the fuel tank airtightness. Plug the fuel pump unit pipe, port B and port C. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port A and wait for a while. Verify that there is no air leakage from the fuel tank. If there is airflow, replace the fuel tank. (See «FUEL TANK REMOVAL/INSTALLATION [LF]»(ref-430308-S33899718022011101700000) .)
6. Plug the fuel pump unit pipe and port B.
7. Level the fuel tank.
8. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port C and wait for a while.
9. With the pressure still applied, verify that there is airflow from port A and the pressure is 0-3 kPa {0-22 mmHg, 0-0.8 inHg} . If there is no airflow, replace the fuel tank. (See «FUEL TANK REMOVAL/INSTALLATION [LF]»(ref-430308-S33899718022011101700000) .)
10. Apply a pressure of -0.5 kPa {-3.8 mmHg, -0.1 inHg} to port C and wait for a while.
11. With the pressure still applied, verify that there is airflow from port A and the pressure is -0.5-0 kPa {-3.8- 0 mmHg, -0.2-0 inHg}. If there is no airflow, replace the fuel tank. (See «FUEL TANK REMOVAL/INSTALLATION [LF]»(ref-430308-S33899718022011101700000) .) If there is airflow, place the fuel tank upside down.
12. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port C and wait for a while.
13. With the pressure still applied, verify that there is no airflow from port A. If there is airflow, replace the fuel tank. (See «FUEL TANK REMOVAL/INSTALLATION [LF]»(ref-430308-S33899718022011101700000) .)

NONRETURN VALVE INSPECTION [LF]

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See «BEFORE SERVICE PRECAUTION [LF]»(ref-430308-S13106615682011101700000) .)
2. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
3. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
4. Remove the fuel pump unit. (See «FUEL PUMP UNIT REMOVAL/INSTALLATION [LF]»(ref-430308-S01516958942011101700000) .)
5. Siphon the fuel from the fuel tank. NOTE: Nonreturn valve is integrated in the fuel tank. The nonreturn valve is normally closed by the spring force.
6. Verify that the nonreturn valve is closed. If the nonreturn valve is stuck open and dose not open even when pulled up by a finger, replace the fuel tank. (See «FUEL TANK REMOVAL/INSTALLATION [LF]»(ref-430308-S33899718022011101700000) .)

FUEL PUMP UNIT INSPECTION [LF]

Scheme 12

Scheme 13

Scheme 14

Scheme 15

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See «BEFORE SERVICE PRECAUTION [LF]»(ref-430308-S13106615682011101700000) .)
2. Remove the fuel-filler cap.
3. Start the fuel pump using the following procedure: Using M-MDS Connect the M-MDS to the DLC-2. Start the fuel pump using the "FP" simulation function of the M-MDS. Without using M-MDS Short the check connector terminal F/P to ground using a jumper wire. Turn the ignition switch to the ON position to operate the fuel pump.
4. Verify that operation sound is heard from the fuel pump If the operation sound cannot be verified, measure the voltage at fuel pump unit wiring harness-side connector terminal B. If as specified, inspect the following: Fuel pump unit continuity If not within the specification, inspect the following: Fuel pump unit relay Wiring harnesses and connectors between main relay and fuel pump relay Wiring harnesses and connectors between fuel pump relay and PCM Wiring harnesses and connectors between battery and fuel pump relay Wiring harnesses and connectors between fuel pump relay and fuel pump unit Standard B+ (Ignition switch at ON)

Continuity Inspection

1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
3. Disconnect the fuel pump unit connector. (See «FUEL PUMP UNIT REMOVAL/INSTALLATION [LF]»(ref-430308-S01516958942011101700000) .
4. Inspect for continuity between fuel pump unit terminals B and D. If there is continuity, perform the "Circuit Open/Short Inspection". (See «CIRCUIT OPEN/SHORT INSPECTION»(ref-430308-S27585680442011101700000) .) If there is no continuity, replace the fuel pump. (See «FUEL PUMP UNIT DISASSEMBLY/ASSEMBLY [LF]»(ref-430308-S09699466732011101700000) .)

Scheme 16

1. Inspect the following wiring harnesses for an open or short circuit (continuity check). Open circuit If there is no continuity, the circuit is open. Repair or replace the harness. Fuel pump unit terminal D and body ground

Fuel Static Pressure Inspection

Note. The fuel static pressure inspection cannot be performed because the pressure regulator is integrated with the fuel pump unit.

Resistance Inspection

1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
3. Disconnect the fuel injector connector.
4. Inspect the resistance between fuel injector terminals A and B using a tester.

Fuel injector resistance

11.4-12.6 ohms [20°C {68°F}]

Scheme 17

1. If within the specification, perform the "Circuit Open/Short Inspection". (Seed-14-23 Circuit Open/Short Inspection.)
2. If not within the specification, replace the fuel injector. (See «FUEL INJECTOR REMOVAL/INSTALLATION [LF]»(ref-430308-S22101311922011101700000) .)

Scheme 18

1. Disconnect the PCM connector. (See the appropriate procedure.)
2. Inspect the following wiring harnesses for open or short circuit (continuity check).

Open circuit

1. 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

1. 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

Scheme 19

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See «BEFORE SERVICE PRECAUTION [LF]»(ref-430308-S13106615682011101700000) .)
2. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
3. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
4. Remove the fuel injector and fuel distributor as a single unit. (See «FUEL INJECTOR REMOVAL/INSTALLATION [LF]»(ref-430308-S22101311922011101700000) .)
5. Fix the fuel injector to the fuel distributor with a wire or the equivalent.
6. Connect the fuel hose.
7. Start the fuel pump using the following procedure

Scheme 20

1. Connect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
2. Connect the M-MDS to the DLC-2.
3. Start the fuel pump using the "FP" simulation function of the M-MDS.

Scheme 21

Scheme 22

1. Short the check connector terminal F/P to ground using a jumper wire.
2. Turn the ignition switch to the ON position to operate the fuel pump. NOTE: Prepare a container to collect the gasoline.

Scheme 23

1. 8. Tilt the fuel injector at an angle of 24 ° to inspect for leakage. If not within the specification, replace the fuel injector. (See «FUEL INJECTOR REMOVAL/INSTALLATION [LF]»(ref-430308-S22101311922011101700000) . Fuel injector leakage amount Less than 1 drop/2 min
2. 9. Stop the fuel pump using the following procedure: Using M-MDS Stop the fuel pump using the "FP" simulation function of the M-MDS. Not using M-MDS Turn the ignition switch to off to stop the fuel pump.
3. 10. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
4. 11. Remove the wire or equivalent securing the fuel injector.
5. 12. Install the fuel injector and fuel distributor as a single unit. (See «FUEL INJECTOR REMOVAL/INSTALLATION [LF]»(ref-430308-S22101311922011101700000) .)
6. 13. Complete the "AFTER SERVICE PRECAUTION". (See «AFTER SERVICE PRECAUTION [LF]»(ref-430308-S11387419382011101700000) .)

Injection Volume Inspection

Scheme 24

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See «BEFORE SERVICE PRECAUTION [LF]»(ref-430308-S13106615682011101700000) .)
2. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
3. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .)
4. Remove the fuel injector. (See «FUEL INJECTOR REMOVAL/INSTALLATION [LF]»(ref-430308-S22101311922011101700000) .).
5. Connect the fuel injector to the fuel injector tester.
6. Start the fuel pump using the following procedure: Using M-MDS Connect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) .) Connect the M-MDS to the DLC-2. Start the fuel pump using the "FP" simulation function of the M-MDS. Without using M-MDS Short the check connector terminal F/P to ground using a jumper wire. Turn the ignition switch to the ON position to operate the fuel pump.
7. Measure the injection volume of each fuel injector. If not within the specification, replace the fuel injector. (See «FUEL INJECTOR REMOVAL/INSTALLATION [LF]»(ref-430308-S22101311922011101700000) .) Fuel injection volume 204-216 ml {204-216 cc, 12.5-13.1 cu in}/min
8. Turn the ignition switch to off to stop the fuel pump.
9. Install the fuel injector. (See «FUEL INJECTOR REMOVAL/INSTALLATION [LF]»(ref-430308-S22101311922011101700000) .)
10. Complete the "AFTER SERVICE PRECAUTION". (See «AFTER SERVICE PRECAUTION [LF]»(ref-430308-S11387419382011101700000) .)

Scheme 25

1. Inspect the atomization status. If not normal, replace the fuel injector. (See «FUEL INJECTOR REMOVAL/INSTALLATION [LF]»(ref-430308-S22101311922011101700000) .)