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I found this from another forum... maybe pulling the SRV and cleaning it would help. I would start there (if mechanically inclined) and also check for shorts/grounds.
The SRV is basically on/part of the upper intake manifold/runners. It's either #1 or #2... I don't remember which. One is the MTV (manifold tuning valve) the other is the SRV (short runner valve)
P1004-SHORT RUNNER VALVE CONTROL PERFORMANCE
Theory of Operation The engine performance and power output is enhanced through the use of the “short runner valve” (SRV) system. The SRV system allows the intake charge air to bypass the long intake manifold runners between the intake manifold plenum and the intake manifold interface to the cylinder heads by providing a shorter runner directly between the plenum and the cylinder head interface The SRV position is controlled by a pneumatic/spring actuator and electronic solenoid valve. When the solenoid is not energized (the “rest” position), the SRV is held in the closed position. When the solenoid is energized the SRV is moved and held in its opened position. There is a set of enable conditions including a minimum engine coolant and ambient temperature, SRV enable, and Powertrain Coordinator load enable condition. If any of these conditions are not met, then the SRV valve is de-energized (closed).
(F344) ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE
(K237) SHORT RUNNER VALVE (SRV) SIGNAL CIRCUIT SHORTED TO GROUND
(K237) SHORT RUNNER VALVE (SRV) SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
(K238) SHORT RUNNER VALVE (SRV) CONTROL CIRCUIT SHORTED TO GROUND
(K238) SHORT RUNNER VALVE (SRV) CONTROL CIRCUIT OPEN OR HIGH RESISTANCE SHORT RUNNER VALVE (SRV) ASSEMBLY
I am going to take it to the dealership on Monday and have them take a look at it.
Take this TSB with you since it pertains directly to your 1004 code and your engine. Good luck. Are you still under warranty?
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