SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1860 (WIRING SYSTEMS AND POWER MANAGEMENT - ELECTRICAL CENTER IDENTIFICATION, COMPONENT CONNECTOR & SPLICE PACK CONNECTOR END VIEWS)COMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X2 (4.3L)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Engine Control Module (ECM) X2 (4.3L)

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Engine Control Module (ECM) X2 (4.3L)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) X2 (4.3L) - Connector End View
GM1673472Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (4.3L)

Pin Wire Circuit Function
1-3 - - Not Used
4 0.5 TN 2761 Low Reference
5 0.35 GY/BK 6272 Low Reference
6 0.5 TN 1744 Fuel Injector 1 Control
7 0.5 YE/BK 846 Fuel Injector 6 Control
8 0.5 TN/WH 845 Fuel Injector 5 Control
9 0.5 BN 2129 Low Reference
10 0.5 L-BU/BK 844 Fuel Injector 4 Control
11 0.5 PK/BK 1746 Fuel Injector 3 Control
12 0.5 L-GN/BK 1745 Fuel Injector 2 Control
13 0.5 GY 2704 5-Volt Reference 1
14-15 - - Not Used
16 0.5 YE 581 Throttle Actuator Control Motor Control - 1
17-19 - - Not Used
20 0.35 BN 6266 Low Reference
21 - - Not Used
22 0.5 PU 2121 Ignition Coil 1 Control
23 0.5 L-BU 2123 Ignition Coil 3 Control
24 0.5 OG/WH 2122 Ignition Coil 2 Control
25-29 - - Not Used
30 0.5 D-GN/WH 428 Evaporative Emission (EVAP) Canister Purge Solenoid Control
31 0.5 OG 225 Generator Turn On Signal
32 0.5 BN 582 Throttle Actuator Control Motor Control - 2
33 0.35 D-BU 6259 5-Volt Reference 1
34 - - Not Used
35 0.35 GY 2705 5-Volt Reference 1
36 0.35 TN/WH 331 Oil Pressure Sensor Signal
37 0.8 PU/WH 1665 Heated Oxygen Sensor (HO2S) High Signal - Bank 1 Sensor 1
38 0.8 PU 1666 Heated Oxygen Sensor (HO2S) High Signal - Bank 2 Sensor 1
39 0.5 L-GN 432 Manifold Absolute Pressure (MAP) Sensor Signal
40 0.35 TN 2752 Low Reference
41 0.35 BK 2755 Low Reference
42 - - Not Used
43 0.5 GY 23 Generator Field Duty Cycle Signal
44 - - Not Used
45 0.35 WH/BK 6271 Crankshaft Position (CKP) Sensor Signal
46 0.35 D-BU/WH 6265 Camshaft Position (CMP) Sensor Signal
47 - - Not Used
48 0.8 TN 1664 Heated Oxygen Sensor (HO2S) Low Signal - Bank 1 Sensor 1
49 0.5 OG/BK 469 Low Reference
50 0.5 GY 1716 Knock Sensor (KS) 1 Signal
51 0.5 D-BU 496 Knock Sensor (KS) 1 Signal
52 - - Not Used
53 0.35 GY 2701 5-Volt Reference 2
54 0.35 PU/WH 6270 5-Volt Reference 2
55-56 - - Not Used
57 0.35 D-GN 485 Throttle Position (TP) Sensor 1 Signal
58 0.5 YE 410 Engine Coolant Temperature (ECT) Sensor Signal
59 0.35 PU 486 Throttle Position (TP) Sensor 2 Signal
60-64 - - Not Used
65 0.8 GY/WH 3113 Heated Oxygen Sensor (HO2S) Heater Low Control - Bank 1 Sensor 1
66 0.8 L-GN 3212 Heated Oxygen Sensor (HO2S) Heater Low Control - Bank 2 Sensor 1
67 - - Not Used
68 0.8 TN 1667 Heated Oxygen Sensor (HO2S) Low Signal - Bank 2 Sensor 1
69 - - Not Used
70 0.5 GY 2303 Knock Sensor (KS) 2 Signal
71 0.5 L-BU 1876 Knock Sensor (KS) 2 Signal
72 - - Not Used
73 3 BK/WH 1551 Ground
Connector Part Information 
  • OEM: 13580811
  • Service: See Catalog
  • Description: 73-Way F MX123 34566 Series Sealed (L-GY)
Terminal Part Information 
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.