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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSELECTRICAL COMPONENT LOCATIONSCOMPONENT LOCATIONS & COMPONENT CONNECTOR END VIEWSCOMPONENT CONNECTOR END VIEWENGINE CONTROL MODULE (ECM) X1 (4.3L)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Engine Control Module (ECM) X1 (4.3L)

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Engine Control Module (ECM) X1 (4.3L)
Fig 1: Engine Control Module (ECM) X1 (4.3L) Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1 (4.3L)

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 X
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 2 Sensor 1
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 X
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 2759 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 0.5 TN 470 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
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 Ignition Lock Cylinder Control Actuator Signal
58 0.5 TN 472 Intake Air Temperature (IAT) Sensor Signal
59-64 - - Not Used
65 0.35 GY 2700 5-Volt Reference (C60)
66 0.5 GY 2709 5-Volt Reference
67 0.35 TN 1274 5-Volt Reference
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 
  • OEM: 15499466
  • Service: 88988931
  • Description: 73-Way F MX123 Series, Sealed (BK)
Terminal Part Information 
  • Pins: 73
  • Terminal/Tray: 7116-4150-02/9
  • Core/Insulation Crimp: E/1
  • Release Tool/Test Probe: 12094430/J-35616-4A (PU)
  • Pins: 1, 6, 8, 18, 21, 25, 27, 30, 32, 41, 47, 50, 57, 65, 67
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 2, 9, 10, 15-17, 3, 13, 19, 20, 24, 35, 37, 39, 42-44, 54, 55, 58, 66, 70
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 2, 9, 10, 15-17 - K/K
  • Core/Insulation Crimp: Pins 3, 13, 19, 20, 24, 35, 37, 39, 42, 43, 44, 54, 55, 58, 66, 70 - J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
RENDER: 1.0x

NO RELATED

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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.