Symptom Troubleshooting - Engine - [Mzi 3.7 V6]: Overview Mazda 6 GH рестайлинг

Scheme 35

Scheme 36

Scheme 37

Main Relay Operation Inspection

1. Verify that the main relay clicks when the ignition is switched to ON and off. If there is no operation sound, inspect the following: Main relay (See «RELAY INSPECTION».) Harness and connector between battery and main relay terminal A Harness and connector between PCM terminal 1AZ and main relay terminal D

Fuel Injector Operation Inspection

FUEL INJECTOR OPERATION INSPECTION CHART

Fuel Pump Operation Inspection

1. Remove the fuel-filler cap.
2. Switch the ignition to ON.
3. Turn the fuel pump relay from off to on using the PCM PID FP and inspect if the fuel pump operation sound is heard. If no operation sounds is heard, go to the next step.
4. Measure the voltage at fuel pump unit terminal B (wiring harness-side). Specification B+ (Ignition switch at on) If the voltage is as specified, inspect the following: Fuel pump continuity Fuel pump ground If not as specified, inspect the following: Fuel pump relay (See «RELAY INSPECTION».) Wiring harness connector (Battery positive terminal-Fuel pump relay-Fuel pump) Wiring harness between fuel pump relay and PCM terminal 1BI

Variable Valve Timing Control System Operation Inspection

When idling cannot be continued

Note. Inspect for each bank.

1. Remove the OCV and verify that the spool valve is at maximum retard position. (See «OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION [MZI 3.7 V6]».) If the spool valve is stuck in advance direction, replace the OCV. (See «OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION [MZI 3.7 V6]».)
2. Connect the OCV connector.
3. Switch the ignition to ON.
4. Verify that the spool valve is at max. retard position. If the spool valve is stuck in advance direction, inspect the following: Short circuit in harnesses or connectors between OCV and PCM.
5. Inspect the variable valve timing actuator.

When idling can be continued

For right bank

1. Disconnect OCV (RH) connector.
2. Warm up the engine and it at idle.
3. Apply the battery voltage to the OCV and verify that the engine idles roughly or stalls. If the engine idles roughly or stalls, inspect the timing belt component (valve timing deviation). If the engine does not idle roughly or stall, go to the next step.
4. Remove the OCV (RH) and perform the spool valve operation inspection. (See «OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION [MZI 3.7 V6]».) If not as specified, inspect the following: OCV (RH) (See «OIL CONTROL VALVE (OCV) INSPECTION [MZI 3.7 V6]».) Harnesses and connectors between OCV (RH) and PCM have an open or short circuit. If as specified, inspect the following right bank hydraulic passages for clogging or leakage, or both. Oil pressure switch-OCV OCV-Camshaft Camshaft internal passage
5. It they are normal, replace the right bank camshaft pulley (with built-in variable valve timing actuator).

When idling can be continued

For left bank

1. Disconnect OCV (LH) connector.
2. Warm up the engine to idle.
3. Apply the battery voltage to the OCV and verify that the engine idles roughly or stalls. If the engine idles roughly or stalls, inspect the timing belt component (valve timing deviation). If the engine does not idle roughly or stall, go to the next step.
4. Remove the OCV (LH) and perform spool valve operation inspection. (See «OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION [MZI 3.7 V6]».) If not as specified, inspect the following: OCV (LH) (See «OIL CONTROL VALVE (OCV) INSPECTION [MZI 3.7 V6]».) Harnesses and connectors between OCV (LH) and PCM have an open or short circuit. If as specified, inspect the following left bank hydraulic passages for clogging or leakage or both. Oil pressure switch-OCV OCV-Camshaft Camshaft internal passage
5. If they are normal, replace the left bank camshaft pulley (with built-in variable valve timing actuator).

See also:
• DTC TABLE [MZI 3.7 V6]
• CRUISE CONTROL SWITCH INSPECTION [MZI 3.7 V6]