Mazdamanuals.com

FUEL INJECTOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))]

Home  id0114u3800700

Fuel Injector Operation Inspection

Warning

•  When inspecting or repairing the fuel system, always proceed with the diagnostics while verifying the [warnings] in the procedure. Not heeding the warnings could lead to an accident which could cause serious injury or death, and damage to equipment.

1.  Connect the M-MDS to the DLC-2.

2.  Start the engine and warm it up.

3.  Perform the KOER self-test and verify that none of the following DTCs is detected. (See DTC INSPECTION.)

•  P0201:00

•  P0202:00

•  P0203:00

•  P0204:00

4.  If any of the following DTCs can be verified, perform the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G (E))].)

•  P0201:00

•  P0202:00

•  P0203:00

•  P0204:00

5.  Monitor the engine speed (ENG_RPM) signal using the PID/data monitor function. (See PID/DATA MONITOR INSPECTION.)

6.  Using the simulation function [INJ], verify that the PID [ENG_RPM] decreases when operation of each injector is stopped. (See SIMULATION INSPECTION.)

•  If there is no decrease, perform the following procedure.

1.  Inspect the resistance for the fuel injectors. (See Resistance Inspection.)

2.  If there is no malfunction in the fuel injectors, inspect the connection condition of the following connectors for the applicable cylinders.

•  PCM

•  Fuel injector

3.  If the connection condition of the connectors is normal, replace the applicable fuel injectors. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)

Fuel Cut Control Inspection

1.  Connect the M-MDS to the DLC-2.

2.  Warm up the engine and idle it.

3.  Load the vehicle on a chassis dynamometer or drive the vehicle on a road.

Warning

•  When performing the procedure from Step 4 on the chassis dynamometer, be careful not to get parts such as tires or rollers caught in the rotating parts.

•  When performing the procedure from Step 4 on a road while driving, always observe the following to ensure safety.

―  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.

―  While performing this step, always operate the vehicle in a safe and lawful manner.

4.  Verify the PIDs [ENG_RPM] and [FUEL_PULSE_WD] using the PID/data monitor function. (See PID/DATA MONITOR INSPECTION.)

5.  Drive the vehicle while verifying the PID [ENG_RPM] and maintain the engine speed at 4,000 rpm or more.

6.  When the accelerator pedal is released without depressing the brake pedal, verify that the PID [FUEL_PULSE_WD] indicates 0 ms until the PID [ENG_RPM] reaches approx. 1,200 rpm and the PID [FUEL_PULSE_WD] indicates 2 to 5 ms when the PID [ENG_RPM] is approx. 1,200 rpm or less.

•  If it cannot be verified, inspect the following items.

―  Under load/under no-load determination signal

―  Engine coolant temperature (ECT) sensor

―  Accelerator pedal position (APP) sensor

―  A/C request signal

Resistance Inspection

1.  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

2.  Disconnect the fuel injector connector. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)

3.  Inspect the resistance between fuel injector terminals A and B.

am3zzw00034772

•  If not within the specification, replace the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)