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HOMESERVICE MANUALSCHEVROLET2012CHEVY EXPRESS G2500, VAN PASSENGER, 4.8L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2463 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEW 2 OF 5)ENGINE CONTROL MODULE (ECM) X2 (HP2)
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A

Engine Control Module (ECM) X2 (HP2)

2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION Engine Control Module (ECM) X2 (HP2)
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Fig 1: Engine Control Module (ECM) X2 (HP2) Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (HP2)

Pin Wire Color Circuit Function
1 0.5 PU 2121 Ignition Coli 1 Control
2 0.5 TN 1664 HO2S Low Signal - Bank 1 Sensor 1
3 0.5 PU/WH 1665 HO2S High Signal - Bank 1 Sensor 1
4 0.5 PU/WH 1668 HO2S High Signal - Bank 1 Sensor 2
5 0.5 TN/WH 1669 HO2S Low Signal - Bank 1 Sensor 2
6 0.8 D-BU 496 Knock Sensor Signal
7 0.8 GY 1716 Knock Sensor Signal
8 0.8 L-BU 1876 Knock Sensor 2 Signal
9 0.8 GY 2303 Knock Sensor Signal
10 - - Not Used
11 0.5 YE 581 TAC Motor Control - 1
12 0.5 BN 582 TAC Motor Control - 2
13 0.5 PK 1339 Ignition Voltage
14 0.35 PU 5284 Cam Phasor Control
15 - - Not Used
16 0.5 PK/BK 1746 Fuel Injector 3 Control
17 0.5 PU/WH 2128 Ignition Coli 8 Control
18 0.5 D-GN/WH 2124 Ignition Coil 4 Control
19 0.5 BN/WH 2130 Low Reference
20-22 - - Not Used
23 0.35 BN 6266 Low Reference
24 0.5 BK 2755 Low Reference
25-26 - - Not Used
27 0.35 GY/BK 6272 Low Reference
28 0.5 PK 1339 Ignition Voltage
29 0.35 TN 2752 Low Reference
30-31 - - Not Used
32 0.5 L-GN/BK 1745 Fuel Injector 2 Control
33 0.5 OG 2127 Ignition Coil 7 Control
34 0.5 D-GN 2125 Ignition Coil 5 Control
35 0.5 BN 2129 Low Reference
36-38 - - Not Used
39 0.35 D-BU 6259 5-Volt Reference
40 0.5 GY 2705 5-Volt Reference
41 - - Not Used
42 0.5 TN 2760 Low Reference
43 0.35 PU/WH 6270 5-Volt Reference
44 0.35 GY 2701 5-Volt Reference
45 - - Not Used
46 0.35 TN 2199 Low Reference
47 - - Not Used
48 0.5 D-BU/WH 878 Fuel Injector 8 Control
49 0.5 TN/WH 845 Fuel Injector 5 Control
50-51 - - Not Used
52 0.5 YE/BK 846 Fuel Injector 6 Control
53 0.5 OG/WH 2122 Ignition Coil 2 Control
54 0.5 L-BU/WH 2126 Ignition Coil 6 Control
55 0.5 L-BU 2123 Ignition Coil 3 Control
56-58 - - Not Used
59 0.35 D-BU/WH 6265 Camshaft Position Sensor Signal
60 0.5 TN/WH 331 Oil Pressure Sensor Signal
61 - - Not Used
62 0.5 TN 472 Intake Air Temperature
(IAT) Sensor Signal
63 0.35 WH/BK 6271 Crankshaft Position Sensor Signal
64 0.35 D-GN 485 Throttle Position Sensor 1 Signal
65 - - Not Used
66 0.35 PU 486 Throttle Position Sensor 2 Signal
67 0.5 YE 492 Mass Air Flow (MAF) Sensor Signal
68 0.5 GY/WH 3113 HO2S Heater Low Control - Bank 1 Sensor 1
69 0.5 GY/WH 3122 HO2S Heater Low Control - Bank 2 Sensor 1
70 0.5 L-BU/BK 844 Fuel Injector 4 Control
71 0.5 OG/BK 877 Fuel Injector 7 Control
72 0.5 TN 1744 Fuel Injector 1 Control
73 3 BK/WH 451 Ground
Connector Part Information 
  • OEM: 15499466
  • Service: 88988931
  • Description: 73-Way F MX123 Series, Sealed (BK)
Terminal Part Information 
  • Pins: 73
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: A/5
  • Release Tool/Test Probe: 12094430/J-35616-35 (VT)
  • Pins: 14, 23, 27, 29, 39, 43-46, 59, 63-66
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 1-13, 16-19, 24, 28, 32-35, 40-42, 48-55, 60-62, 67-72
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 1-5, 11-72 - J/J
  • Core/Insulation Crimp: Pins 6-9 - K/K
  • 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.
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  • • 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.