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.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 131 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT VIEWS & COMPONENT CONNECTOR END VIEWS)COMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X1 (L61)
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Engine Control Module (ECM) X1 (L61)
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Engine Control Module (ECM) X1 (L61)
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
Engine Control Module (ECM) X1 (L61)
| Pin | Wire | Circuit | Function |
|---|---|---|---|
| 1 | D-BU | 1161 | APP Sensor 1 Signal |
| 2 | - | - | Not Used |
| 3 | 0.35 BN | 4 | Accessory Voltage |
| 4 | - | - | Not Used |
| 5 | D-GN | 335 | Low Speed Cooling Fan Relay |
| 6 | D-GN/WH | 465 | Fuel Pump Relay Control |
| 7 | - | - | Not Used |
| 8 | 0.35 TN | 5514 | Low Reference |
| 9-12 | - | - | Not Used |
| 13 | 0.35 BN | 5069 | Powertrain Relay Control |
| 14-17 | - | - | Not Used |
| 18 | L-BU | 1162 | APP Sensor 2 Signal |
| 19 | 0.35 PK | 639 | Ignition 1 Voltage |
| 20 | 0.35 RD/WH | 540 | Battery Positive Voltage |
| 21 | 0.35 PU | 1272 | Low Reference |
| 22 | - | - | Not Used |
| 23 | 0.35 TN | 2759 | Low Reference |
| 24 | 0.35 OG/BK | 1057 | Low Reference |
| 25 | 0.35 OG/BK | 380 | A/C Refrigerant Pressure Sensor Signal |
| 26 | - | - | Not Used |
| 27 | 0.35 BN/WH | 419 | MIL Control |
| 28-29 | - | - | Not Used |
| 30 | D-GN/WH | 459 | A/C Compressor Clutch Relay Control |
| 31 | - | - | Not Used |
| 32 | 0.35 PU/WH | 6386 | Starter Relay Coil Control |
| 33-36 | - | - | Not Used |
| 37 | 0.35 YE | 492 | MAF Sensor Signal |
| 38 | - | - | Not Used |
| 39 | 0.35 PU | 1589 | Fuel Level Sensor Signal |
| 40 | - | - | Not Used |
| 41 | 0.35 BN | 1271 | Low Reference |
| 42 | D-GN | 890 | Fuel Tank Pressure Sensor Signal |
| 43 | 0.35 TN/BK | 2500 | High Speed GMLAN Serial Bus + |
| 44 | 0.35 TN | 2501 | High Speed GMLAN Serial Bus - |
| 45-46 | - | - | Not Used |
| 47 | 0.35 WH/BK | 1164 | 5-Volt Reference 2 |
| 48 | - | - | Not Used |
| 49 | 0.35 D-BU | 473 | High Speed Cooling Fan Relay Control |
| 50-54 | - | - | Not Used |
| 55 | 0.35 WH | 17 | Stop Lamp Switch Signal |
| 56 | - | - | Not Used |
| 57 | 0.35 OG/BK | 1786 | Park/Neutral Signal |
| 58 | 0.35 TN | 472 | IAT Sensor Signal |
| 59-64 | - | - | Not Used |
| 65 | 0.35 GY | 2700 | 5-Volt Reference 1 |
| 66 | 0.35 GY | 705 | 5-Volt Reference |
| 67 | 0.35 TN | 1274 | 5-Volt Reference 1 |
| 68-69 | - | - | Not Used |
| 70 | 0.35 WH | 1310 | EVAP Canister Vent Solenoid Control |
| 71-72 | - | - | Not Used |
| 73 | 0.8 PK/BK | 5290 | Ignition 1 Voltage |
Connector Part Information
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Terminal Part Information
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RENDER: 1.0x
NO RELATED
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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.