Wastegate and P1249 code
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Laughing Gas
Joined: Jan 2006
Posts: 1,045
Likes: 5
From: Gig Em, Tx
Wastegate and P1249 code
I noticed, on the Autoengenuity Help link, that the wastegate is supposed to be near 0 when idling. Watching on my AE screen, mine stays around 87% at idle and goes down when I get on it. I get a consistent P1249 and this may be the reason why. I have followed the diagnostics checks for the wastegate and have found nothing wrong. Anyone know where the wastegate duty cycle value is generated. Is it internal in the PCM or a sensor somewhere. I am leaning toward a bad PCM but want to make sure before I condemn it. Other than the code the truck runs and performs fine.
Senior User
Joined: Mar 2007
Posts: 491
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From: Kingsland, GA
Originally Posted by Pocket
I've also wondered. My wastegate duty cycle stays at 99% no matter what. It has never thrown a code or been an issue.
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Laughing Gas
Joined: Jan 2006
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Likes: 5
From: Gig Em, Tx
Originally Posted by Zwalters
Don't mess with what isn't broke, unless your breaking it to have fun or make it better.
Post Fiend
Joined: Jun 2006
Posts: 5,497
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From: Central, Al
From the service manual:
When pressure is supplied on the red hose going to the actuator (solenoid NOT energized (0%)) the valve will open, dumping boost. When low or no pressure is on the red hose going to the actuator (solenoid is being energized (99%)), the valve will stay closed.
The PCM commands duty cycle based on MAP readings compared to BARO readings to determine boost (Manifold Gauge Pressure in AE)
When pressure is supplied on the red hose going to the actuator (solenoid NOT energized (0%)) the valve will open, dumping boost. When low or no pressure is on the red hose going to the actuator (solenoid is being energized (99%)), the valve will stay closed.
The PCM commands duty cycle based on MAP readings compared to BARO readings to determine boost (Manifold Gauge Pressure in AE)
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Laughing Gas
Joined: Jan 2006
Posts: 1,045
Likes: 5
From: Gig Em, Tx
Curtis and Zwalters, Do either of you see the P1249 code? It doesn't lite the MIL but will show up on a scanner.
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Senior User
Joined: Mar 2007
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From: Kingsland, GA
Originally Posted by sgrol
Curtis and Zwalters, Do either of you see the P1249 code? It doesn't lite the MIL but will show up on a scanner.
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