Question about 2005 GMC Envoy
I have checked the circuits on this thing. The Air Solinoid Valve resistance across pins is 4 ohms. I have removed the valve and don't see anything allarming about it. There was a little moisture in the valve when I took it off. The inside does not look bad I did soak it with penetrating oil before putting in back on. I ran a trouble light from the pos side of the battery to the ground side of the harnes and it lights up. I have replace both Oxygen sensors within the last two weeks. One thing I did find the air pump is not running. The relay is good (checked with ohm metter and the pump runs when connected to power supply. What I don't get is a ground to the control side of the Air blower relay. When I run the control side Air Pump Relay to ground things work. Information I don't have is where this wire runs to and at what point is the loop closed to go to ground. Reading the diagnosis chart it is controled by the PCM via Oxygine sensor. What the chart does not say if it closes the loop during initial start or after a vehicle has warmed up. I would also like to know where the other end of the wire is so I can do a continuity check to see if I have an open wire. Am I chasing the wrong thing? Is there something else I need to be looking at. I just wish I could afford a tech scanner.
The relay ground will be controlled by the PCM. The air injection pump is only commanded on for a few seconds when the engine temp sensor is reading below 210 deg f (cold start conditions). This makes the temp sensor the primary input for this system not the 02 sensor. The PCM looks for the 02 sensor to drop below 150 millivolts within 2 or three seconds of starting the fan and opening the solenoid. if the 02 sensor does not do this, code P0410. Did you run 12V to the solenoid? Did it open?
Closed loop status simply refers to a condition in which the engine is using feedback from the 02 sensors to control the air/fuel ratio.
Posted on Jun 02, 2010
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This is a test of the sensor only. A complete test of the circuit requires the DRBII scan tool, or equivalent.
Unplug the wiring harness connector from the intake manifold temperature sensor.
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