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Remove the air duct from throttle valve body. Verify that the throttle valve opens when throttle pedal is depressed. If the throttle valve opens, inspect the throttle position sensor and related wiring If the throttle valve does not open, inspect the throttle actuator control motor and FUEL INJECTOR OPERATION INSPECTION FUEL INJECTOR OPERATION INSPECTION CHART FUEL CUT CONTROL SYSTEM INSPECTION If simulation function of the M-MDS is used: 1. Warm up the engine and idle it. 2. Connect the M-MDS to the DLC-2. 3. Select the RPM and FUELSYS1 PIDs. STEP INSPECTION RESULTS ACTION 1 While cranking the engine, inspect for fuel Yes Fuel injector operation is normal. No All cylinders not heard: Go to the next step. Some cylinders not heard: Go to Step 3. 2 Perform main relay operation inspection. Yes Inspect the following: Fuel injector power system PCM connectors Fuel injector GND and related No Repair or replace malfunctioning parts. 3 Switch fuel injector connector of not operating Yes Go to the next step. No Replace the fuel injector. 4 Are wiring harness and connectors of not Yes Inspect PCM terminal voltage of fuel No Repair or replace malfunctioning parts. NOTE: This inspection has to perform after the Fuel Injector Operation Inspection.
2008 Mazda CX-9 Grand Touring 2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
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