There should be a Schrader valve on the fuel rail (looks like a valve stem on a tire, it is metal).
You need to connect a fuel pressure gauge to that valve and do the following test:
Fuel Trim Too Lean
Possible Causes:
The current cell can be observed using a scan tool.The system will go lean if an injector is not providing enough fuel.A lean condition could be present during high fuel demand due to a fuel pump not pumping enough fuel, plugged fuel filter or a restricted fuel line.Insufficient fuel in the tank or low fuel pressure may cause this DTC to set. Refer to Fuel System Diagnosis .Review the Failure Records with a scan tool. If an intermittent condition is suspected, refer to Intermittent Conditions .
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