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HOMESERVICE MANUALSCHEVROLET2011CHEVY EXPRESS G3500, VAN CARGO EXTENDED, 6.6 LREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSWIRING DIAGRAMSWIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - 1-2 SHIFT SOLENOID THROUGH FUEL INJECTOR 5COMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM)ENGINE CONTROL MODULE (ECM) X1 (LGH)
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 L

Engine Control Module (ECM) X1 (LGH)

2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 LSECTION Engine Control Module (ECM) X1 (LGH)
Fig 1: Connector End View (LF1) Engine Control Module (ECM) X1 (LGH)
GM1968294Courtesy of GENERAL MOTORS CORP.
ENGINE CONTROL MODULE (ECM) X1 (LGH)

Pin Wire Circuit Function
1 0.8 BN/WH 3100 DEF Dosing Valve Low Control
2 0.8 BN 3099 DEF Dosing Valve High Control
3 0.5 D-BU 3105 DEF Smart Pump Control
4 0.5 D-GN/WH 465 Fuel Pump Primary Relay Control
5 0.5 YE/BK 625 Starter Enable Relay Control
6 0.8 D-GN 3101 DEF Reverting Valve High Control
7 0.5 BN/WH 6783 Low Reference
8 - - Not Available
9 0.5 L-BU/WH 6311 Cruise/ETC/TCC Brake Signal
10-13 - - Not Available
14 0.5 GY 2365 5 Volt Reference
15 0.5 GY/BK 2931 Low Reference
16 0.5 L-BU/WH 6288 Low Reference
17 0.5 BN/WH 419 Check Engine Indicator Control
18 0.5 PU 2927 Hydrocarbon Injector Low Control
19 0.5 WH/BK 2366 Cooling Fan Control Relay Speed Signal
20 0.5 D-BU 507 Wait To Start Indicator Control
21 0.5 WH/BK 2366 Cooling Fan Control Relay Speed Signal
22 0.5 TN 3657 Low Reference
23-24 - - Not Available
25 0.5 OG/BK 1786 Transmission Park/Neutral Signal
26 0.5 D-BU 5985 Accessory Wakeup Serial Data
27 0.5 TN 3661 Low Reference
28 0.5 TN 2759 Low Reference
29 0.5 BN 3108 DEF Pressure Sensor Signal
30 0.5 GY 3106 5 Volt Reference
31 0.5 TN 3107 Low Reference
32 - - Not Available
33 0.5 D-BU 2926 Hydrocarbon Injector High Control
34 0.5 D-GN/WH 459 A/C Compressor Clutch Relay Control
35 0.5 TN 3104 Low Reference
36 0.5 TN 5514 Low Reference
37 - - Not Available
38 0.5 L-BU 5377 Exhaust Gas Temperature Sensor 2 Signal
39 0.5 L-BU 1162 Accelerator Pedal Position Signal 2
40 0.5 TN/BK 6289 Induction Air Temperature Sensor Signal
41 0.5 D-BU 6053 Exhaust Pressure Sensor Signal 1
42 0.5 WH/BK 1164 5 Volt Reference
43 0.5 GY 6054 5 Volt Reference
44 0.5 YE 6055 Low Reference
45 0.5 L-GN 7494 High Speed GMLAN Serial Data (-) (3)
46 0.5 TN 2501 High Speed GMLAN Serial Data (-) (1)
47 - - Not Available
48 0.5 PK 439 Run/Crank Ignition 1 Voltage
49 0.5 YE 492 Mass Air Flow Sensor Signal
50 0.8 OG 225 Generator Turn On Signal
51 0.5 PU 1272 Low Reference
52 - - Not Available
53 0.8 BK 3102 DEF Reverting Valve Low Control
54 0.5 GY 3103 DEF Smart Pump Supply Voltage
55 0.5 BN 1271 Low Reference
56 0.5 D-BU/WH 3660 Exhaust Gas Temperature Sensor 4 Signal
57 0.5 L-GN 5378 Exhaust Gas Temperature Sensor 3 Signal
58 0.5 PU 1589 Primary Fuel Level Sensor Signal
59 0.5 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
60 - - Not Available
61 0.5 D-BU 1161 Accelerator Pedal Position Signal 1
62 0.5 TN 1274 5 Volt Reference
63 0.5 GY 2700 5 Volt Reference
64 - - Not Available
65 0.5 D-GN 7493 High Speed GMLAN Serial Data (+) (3)
66 0.5 TN/BK 2500 High Speed GMLAN Serial Data (+) (1)
67 0.5 RD/WH 440 Battery Positive Voltage
68 0.5 YE 5991 Powertrain Relay Coil Control
69 0.5 D-BU 2364 Cooling Fan Speed Signal
70 0.8 GY 23 Generator Field Duty Cycle Signal
71 0.5 BN/WH 6141 Low Reference
72 0.5 OG/BK 6399 Replicated TOS Signal
73 3 PK 1439 Run/Crank Ignition 1 Voltage
Connector Part Information
  • Harness Type: Engine Chassis
  • OEM Connector: 13649839
  • Service Connector: 13574946
  • Description: 73-Way F MX123 34566 Series (BU)
Terminal Part Information
  • Pins: 1-7, 9, 14-20, 22, 25-31, 33-36, 38-46, 48-59, 61-63, 65-72
  • Terminated Lead: 13575575
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins: 1-2, 6, 50, 53, 70 - K/K
  • Core/Insulation Crimp: 3-5, 7, 9, 14-20, 22, 25-31, 33-36, 38-46, 48-49, 51-52, 54-59, 61-63, 65-69, 71-72 -J/J
  • Pin 73
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: A/5
RENDER: 1.0x

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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.