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.
2007 Hummer H3 AutomaticFACTORY OEM SERVICE PROCEDURE
Powertrain Control Module (PCM) Connector End View C3 (M30)
Powertrain Control Module (PCM) C3 (M30) Connector Parts Information
Connector Part Information
|
Terminal Part Information
|
Powertrain Control Module (PCM) C3 (M30) Connector Terminal Identification
| Pin | Wire Color | Circuit No. | Function |
|---|---|---|---|
| 1 | PK | 1224 | Transmission Fluid Pressure Switch Signal A |
| 2 | GY | 773 | Transmission Range Switch Signal C |
| 3 | - | - | Not Available |
| 4 | TN/WH | 1669 | HO2S Low Signal Bank 1 Sensor 2 |
| 5 | - | - | Not Available |
| 6 | RD/BK | 1228 | PC Solenoid Valve High Control (Sol. A) |
| 7 | YE/BK | 1227 | TFT Sensor Signal |
| 8-14 | - | - | Not Available |
| 15 | TN/BK | 231 | Oil Pressure Switch Signal |
| 16 | - | - | Not Available |
| 17 | BK | 2762 | Low Reference |
| 18 | - | - | Not Available |
| 19 | PU/WH | 1668 | HO2S High Signal Bank 1 Sensor 2 |
| 20 | BK/WH | 771 | Transmission Range Switch Signal A |
| 21 | WH | 687 | 3-2 Shift Solenoid Valve Control |
| 22-24 | - | - | Not Available |
| 25 | TN/BK | 422 | TCC Solenoid Valve Control |
| 26-29 | - | - | Not Available |
| 30 | RD | 1226 | Transmission Fluid Pressure Switch Signal C |
| 31 | YL | 6787 | Air Injection Reaction Control Valve #1 Control (K18) |
| 32 | - | - | Not Available |
| 33 | L-GN | 1222 | 1-2 Shift Solenoid Valve Control |
| 34 | TN/BK | 464 | Delivered Torque Signal |
| 35 | YE/BK | 1223 | 2-3 Shift Solenoid Valve Control |
| 36 | PU | 114 | Low Reference |
| 37 | D-GN/WH | 428 | EVAP Canister Purge Solenoid Control |
| 38 | - | - | Not Available |
| 39 | BN | 418 | TCC PWM Solenoid Valve Control |
| 40-42 | - | - | Not Available |
| 43 | D-BU | 1225 | Transmission Fluid Pressure Switch Signal B |
| 44 | PU | 401 | Signal Low - Front |
| 45 | YE | 400 | Signal High - Front |
| 46 | BK/WH | 1423 | HO2S Heater Low Control Bank 1 Sensor 2 |
| 47 | OG/BK | 463 | Requested Torque Signal |
| 48 | L-BU/WH | 1229 | PC Solenoid Valve Low Control (Sol.A) |
| 49 | D-BU | 6253 | Low Reference |
| 50 | YE | 772 | Transmission Range Switch Signal B |
| 51 | - | - | Not Available |
| 52 | WH | 776 | Transmission Range Switch Signal P |
| 53-56 | - | - | Not Available |
Factory Service Tools
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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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