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 TEST HG: Positive Crankcase Ventilation (PCV) System: Introduction
This pinpoint test is intended to diagnose the following:
- positive crankcase ventilation (PCV) valve (6A666) and related vacuum lines
- electrically heated PCV valve (6A666) and heater circuit
- electrically heated PCV fitting (9F624) and heater circuit
- powertrain control module (PCM) (12A650)
| Pin | Circuit |
|---|---|
| 1 | PCVHC (Positive Crankcase Ventilation Valve Heater Control) |
| 2 | IGN START/RUN (Ignition START/RUN) |
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to SECTION 6: REFERENCE VALUES .
| Connector | Pin | Circuit |
|---|---|---|
| 190-PIN | E4 | PCVHC |
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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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