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Torque » Torque OBD ECU Scanner » Torque Discussion / Ideas » GM Cam Retard Offset PID Found!

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Author Topic: GM Cam Retard Offset PID Found!
Capp777
Member
Posts: 2560
Post Re: GM Cam Retard Offset PID Found!
on: November 20, 2018 (GMT)

Two’s complement math eliminates the end
around carry of the Sign-Magnitude method,
which uses only one complement math, and
the two forms of Sign-Magnitude zero are
reduced to only one zero.

As always, I could be wrong.

1111 1111 (-1)
1111 1111 (-1)
==== ==== +
1111 1110 (-2)

0000 0010 (+2)
1111 1111
==== ==== XOR
1111 1101 (-3) Ones Complement
0000 0001 (+1)
==== ==== +
1111 1110 (-2) Twos Complement

0000 0001 (+1)
1111 1111
==== ==== XOR
1111 1110 (-2) Ones Complement
0000 0001 (+1)
==== ==== +
1111 1111 (-1) Twos Complement

0000 0000 (0)
1111 1111
==== ==== XOR
1111 1111 (-1) Ones Complement
0000 0001 (+1)
==== ==== +
0000 0000 (0) Twos Complement

The long list of data was provided as a
way to determine correct slope of the
equation by slowly twisting the distributor until
a P1345 DTC is triggered then comparing
its raw hex response at a known degree
against the posted equations.

Edited.

F-150Torqued
Member
Posts: 382
Post Re: GM Cam Retard Offset PID Found!
on: November 20, 2018 (GMT)

Exactly.

—————-
54371019

RKCRLR
Member
Posts: 1
Post Re: GM Cam Retard Offset PID Found!
on: December 4, 2018 (GMT)

I’ve been trying to access the CMP on my 2000 K3500 7.4L using a Kobra bluetooth adapter with no success so far.

Car Gauge Pro couldn’t connect using the GM powertrain option (failed to connect to ECU). It connected fine using the generic OBDII setting but then I don’t have access to the GM extended PIDs.

I purchased Torque Pro and made a custom PID for the CMP per the instructions here. It just displays a “-” in the digital gauge readout. About 1/4 of the PIDs are green when I add a gauge – I’m assuming that means those PIDs are available since they have readings when I add them. None of the PIDs proceeded with [GM] are green or have readouts.

I installed the trial version of Dash Command and tried to follow the instructions posted by DCS to see if I have access to CMP but I don’t the little 3-dot menu button at the bottom right. But there are no GM specific PIDs in the PIDs available to me.

I figure either the Kobra adapter isn’t allowing access to the GM extended PIDs or the protocol is different on a 2000 K3500 (GM did make both the K3500 and the 1 ton Silverado that year). Which is more likely? I’m willing to either buy a different bluetooth adapter (BAFX) or Dash Command if that will solve the problem.

Thanks

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