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DA BIG ONE
04-12-2007, 20:48
Went to a mechanical boost control some time ago and get the SES light for turbo boost control circuit, tried using resister to no avail.

Any of you know how to shut SES off forever in relation to this circuit, or does it need to be flashed?
gmctd
04-13-2007, 18:06
Might try following Bill's advice for setting the wg adjustment, even with the 'cooler - MaxEtork has the upper limit skewed for performance, doesn't require any Boost-foolery to take advantage of the available increased power levels
DA BIG ONE
04-14-2007, 13:30
Bad circuit, so placed a resistor at the PCM but still throwing P1656.
gmctd
04-14-2007, 13:41
What is your max Boost, incl max transient Boost?
DA BIG ONE
04-14-2007, 16:40
I'm getting 14+psi post IC @ intake w/spikes over 20psi when cold.
gmctd
04-14-2007, 17:48
14 is good, it's the 20 that's causing the DTC - could be the MAP or BARO sensor is off.

Call Bill, see what he sez...........
rjwest
04-15-2007, 15:18
P1656 is the PCM thinking the Waste Gate solenoid is defective...

Need something on the line to the PCM , like a solenoid, it knows it ain't there.
DA BIG ONE
04-15-2007, 16:21
P1656 is the PCM thinking the Waste Gate solenoid is defective...

Need something on the line to the PCM , like a solenoid, it knows it ain't there.

I spliced an 8 watt 50 ohm resistor at the PCM 1 end to the yellow boost control circuit wire, then the other to an orange hot wire next to it, guessing this is not good, or?
rjwest
04-16-2007, 02:56
Book says to test for .75 amps ( 3/4 )

My math says is 16 ohms,,, orange wire in C3D13 says battery,

but schmatic shows voltage source of wastegate solenoid as eng1 fuse 15, don't know if it makes a differance,
maybe, should have left the solenoid on/hooked up

hope this helps.
DA BIG ONE
04-16-2007, 03:49
Book says to test for .75 amps ( 3/4 )

My math says is 16 ohms,,, orange wire in C3D13 says battery,

but schmatic shows voltage source of wastegate solenoid as eng1 fuse 15, don't know if it makes a differance,
maybe, should have left the solenoid on/hooked up

hope this helps.

I had removed circuit because it was damage in harness, perhaps I may go back and rewire it as a standalone circuit w/solenoid installed, no vaccum though "have no pump".
rjwest
04-16-2007, 15:20
try the 16 ohm and measure the circuit with an ampmeter,
That is the GM repair procedure for that code.
Very specific on the value, High or low amps (no amps ) will evidently set the code.