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Caprice vs GXP ECM Pinouts

Caprice

Caprice

G8 GXP

G8 GXP

= Clutch Pedal

= Reverse

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Caprice vs Camaro ECM Pinouts

Caprice

Caprice

Camaro

Camaro

= Clutch Pedal

= Reverse

Comes or go to old trans plug?

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BCM Pinouts

Caprice

Camaro

Caprice

Camaro

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X1 ECM Connector

GXP/Camaro ECU

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Key Capture Jumper at Shifter Plug

Need to jumper ppl/wht and black wires together at connector or ground ppl/wht

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Caprice Brake Pedal Position Sensor

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**Need to rewire ECM pins for CPP

**Details in additional slide

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Camaro CPP Sensor

Wires from Caprice (Brake Sensor)

Gray

Tan

Brown

*See slide 6 for Caprice brake sensor pinout

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GMLAN Data Bus Loop:

Jumper pins 11-13 and 10-14

Caprice Wiring

Caprice TCM Plug Pinout

Reverse Switch Wiring:

(Switch 🡪 TCM plug)

Green 🡪 Pin 2 Ground (black)

Pink 🡪 Pin 3 (org/blk)

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**At ECM X1, pin 1 (org/blk)

Move to X1, pin 8

X1 ECM Plug

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Traction Control Button

Used a traction control button only (above) and pins were same (4&7) like below.

Forum thread for connector information below (https://www.newcaprice.com/forum/viewtopic.php?t=1022&start=10)

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Wiring Changes to Make

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  1. CPP – take 3 wires at current brake position sensor (separate slide)
    • A pin – gray wire
    • C pin – brn/ylw wire
    • B pin – tan wire
  2. Reverse light switch (separate slide)
    • Use TCM plug wires
      • Pin 2 – black – ground
      • Pin 3 – org/blk – signal
      • At ECM move X1, pin 1 to pin 8 (extend wire)
  3. Jumper TCM pins 11-13 and 10-14 (GMLAN)
  4. Key capture mechanism
  5. Traction control switch

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Tune Changes to Make

  1. Segment swap all segments to existing tune from Ute/Commodore file
    • Must be same OS in HP Tuners
  2. Disable skip shift
  3. Disable CPP?
  4. ABS sensor for speed control

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Fabrication and Misc.

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  1. Transmission cross member
  2. BCM custom tuning?
    • Likely not needed
  3. Custom driveshaft or shorten yours
    • 27” from guibo to carrier bearing (Driveshaft Pros)
    • Hard to find local shop to shorten and balance
  4. Shortened MGW shifter arms and center linkage by 0.8”
  5. Exhaust adjusted for new crossmember

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Caprice TCM (Internal)

P/N Signal from Harness Pin 3

Possibly not need BCM reprogrammed?

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GXP ECU

*No changes due to skip shift and speed signal changed in tune

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GXP Auto Shifter Wiring

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Caprice Shifter Wiring