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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 (LU3)
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 L

Engine Control Module (ECM) X1 (LU3)

2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 LSECTION Engine Control Module (ECM) X1 (LU3)
Fig 1: Connector End View Engine Control Module (ECM) X1 (LU3)
GM1673472Courtesy of GENERAL MOTORS CORP.
ENGINE CONTROL MODULE (ECM) X1 (LU3)

Pin Wire Circuit Function
1 0.35 D-BU 1161 Accelerator Pedal Position (APP) Sensor 1 Signal
2 0.8 PU 1670 Heated Oxygen Sensor (HO2S) High Signal - Bank 2 Sensor 2
3 0.5 D-BU 5985 Accessory Wakeup Serial Data
4-5 - - Not Used
6 0.35 D-GN/WH 465 Fuel Pump Relay Control - Primary
7 - - Not Used
8 0.35 TN 5514 Low Reference (C60)
9 0.8 TN/WH 1669 Heated Oxygen Sensor (HO2S) Low Signal - Bank 1 Sensor 2
10 0.8 TN 1671 Heated Oxygen Sensor (HO2S) Low Signal - Bank 2 Sensor 2
11-12 - - Not Used
13 0.5 YE 5991 Powertrain Relay Control
14 - - Not Used
15 0.8 GY/WH 3122 Heated Oxygen Sensor (HO2S) Heater Low Control - Bank 1 Sensor 2
16 0.8 OG/WH 3223 Heated Oxygen Sensor (HO2S) Heater Low Control - Bank 2 Sensor 2
17 0.8 PU/WH 1668 Heated Oxygen Sensor (HO2S) High Signal - Bank 1 Sensor 2
18 0.35 L-BU 1162 Accelerator Pedal Position (APP) Sensor 2 Signal
19 0.5 PK 439 Ignition Voltage
20 0.5 RD/WH 440 Battery Positive Voltage
21 0.35 PU 1272 Low Reference
22-23 - - Not Used
24 0.5 TN/BK 6049 Low Reference
25 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal (C60)
26 - - Not Used
27 0.35 BN/WH 419 MIL Control
28-29 - - Not Used
30 0.35 D-GN/WH 459 A/C Compressor Clutch Relay Control (C60)
31 - - Not Used
32 0.35 YE/BK 625 Starter Enable Relay Control
33-34 - - Not Used
35 0.8 TN 2760 Low Reference
36 - - Not Used
37 0.5 YE 492 Mass Air Flow (MAF) Sensor Signal
38 - - Not Used
39 0.5 PU 1589 Fuel Level Sensor Signal - Primary
40 - - Not Used
41 0.35 BN 1271 Low Reference
42 0.5 D-GN 890 Fuel Tank Pressure Sensor Signal
43 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus (+)
44 0.5 TN 2501 High Speed GMLAN Serial Data Bus (-)
45-46 - - Not Used
47 0.35 WH/BK 1164 5-Volt Reference 2
48-49 - - Not Used
50 0.35 YE/BK 1827 Vehicle Speed Signal
51-53 - - Not Used
54 0.5 OG/BK 6399 Replicated TOS Signal
55 0.5 L-BU/WH 6311 Torque Converter Clutch (TCC) Brake Signal
56 - - Not Used
57 0.35 OG/BK 1786 Park/Neutral Signal
58 0.5 TN 472 Intake Air Temperature (IAT) Sensor Signal
59-64 - - Not Used
65 0.35 GY 2700 5-Volt Reference 1 (C60)
66 0.5 GY 2709 5-Volt Reference 1
67 0.35 TN 1274 5-Volt Reference 1
68-69 - - Not Used
70 0.5 WH 1310 Evaporative Emission (EVAP) Canister Vent Solenoid Control
71-72 - - Not Used
73 0.5 PK 1339 Ignition Voltage
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 13580810
  • Service Connector: 88988931
  • Description: 73-Way F MX123 34566 Series (BK)
Terminal Part Information
  • Pins: 1, 2-3, 6, 8-10, 13, 15-21, 24-25, 27, 30, 32, 35, 37, 39, 41-44, 47, 50, 54-55, 57-58, 65-67, 70
  • Terminated Lead: Pins: 1, 6, 8, 18, 21, 25, 27, 30, 32, 41, 47, 50, 57, 65, 67 - 13575811
  • Terminated Lead:Pins: 2-3, 9-10, 13, 15-17, 19-20, 24, 35, 37, 39, 42-44, 54-55, 58, 66, 70 - 13575575
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: Pins: 1, 6, 8, 18, 21, 25, 27, 30, 32, 41, 47, 50, 57, 65, 67 - 33467-0003/23
  • Terminal/Tray: Pins: 2-3, 9-10, 13, 15-17, 19-20, 24, 35, 37, 39, 42-44, 54-55, 58, 66, 70 - 33467-0005/23
  • Core/Insulation Crimp: Pins: 1, 6, 8, 18, 21, 25, 27, 30, 32, 41, 47, 50, 57, 65, 67 - H/H
  • Core/Insulation Crimp:Pins: 2, 9-10, 15-17, 35, 37, 58 - K/K
  • Core/Insulation Crimp: Pins: 3, 13, 19-20, 24, 39, 42-44, 54-55, 66, 70 - J/J
  • Pin 73
  • Terminated Lead: Pending
  • Release Tool: J-38125-12A
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 1326030-8/17
  • Core/Insulation Crimp: A/4
RENDER: 1.0x

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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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