P0065 Code - Air Assisted Injector Control Range/Performance

What Does Code p0065 Mean?

OBD-II Code P0065 is defined as a Air Assisted Injector Control Range/Performance

The Air Assist Injector allows the engine to reach operating temperature faster on startup. When the engine control module (PCM) detects an incorrect signal from the Air Assist Injector, it will set code P0065.

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What are some of the common causes of the code?

Causes for this code may include:

• Broken or damaged wiring harness
• Vacuum leak within injector or in hoses/clamps
• Fuse/relay defective
• Air Assisted Fuel Injector defective
• ECM issue Pin/connector problem. (e.g. corrosion, overheating, etc.)

How do you troubleshoot P0065 ?

Before troubleshooting, check with your dealership service center for TSBs (technical service bulletins) or recalls, as there may be an updated part or ECM reflash available to resolve the problem. It also does good for one to note that, if the control valve has been replaced, there may be an ECM relearning procedure for the new valve.

• Control Valve Check

Check that the control valve is properly connected. Check the connector for corrosion or water intrusion. Repair as necessary.
Disconnect the air hoses from the control valve and energize the valve, either using a scan tool active test or by applying battery voltage, and see that air passes when the valve is activated. See that air does not pass when the valve is deactivated. Clean or replace as necessary.

• Air Check

Check that rubber hoses and tubes are in good shape, with no cracks or kinks. Check that metal tubes are not kinked. Repair as necessary.

Blow air into the system, at low pressure, and check for air escaping from the intake or exhaust. If air is escaping from anywhere else, suspect a faulty seal or tube. Repair as necessary. Some air may escape from around the fuel injectors, but this is not common.

• Sensor Check

Because the ECM monitors air-assist using the AFR sensors, if you have a sensor problem, it could set off an erroneous air-assist DTC. If you can perform a fuel trim active test, you can confirm how fast the AFR sensor reacts.

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