Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Tests QA: Unable To Activate Self-Test/Network Communication Error: Introduction
This pinpoint test is intended to diagnose the following:
- unable to communicate with the powertrain control module (PCM)
- incorrect self-test procedure
- harness circuits: B+, ETCREF, GND, ISP-R, PWRGND and VPWR
Harness Side
| Circuit | Pin |
|---|---|
| ETCREF (Electronic Throttle Control Reference Voltage) | 5 |
| ETCRTN (Electronic Throttle Control Return) | 4 |
Harness Side
| Circuit | Pin |
|---|---|
| ISP-R (Ignition Switch Position Run) | B8 |
| KAPWR (Keep Alive Memory Power) | B10 |
| PCMRC (PCM Relay Control) | B1 |
| VPWR (Vehicle Power) | B11 |
| VPWR (Vehicle Power) | B12 |
| PWRGND (Power Ground) | T31 |
| PWRGND (Power Ground) | B35 |
| PWRGND (Power Ground) | B36 |
| PWRGND (Power Ground) | B47 |
| PWRGND (Power Ground) | B48 |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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