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Home >> Hummer >> 2008 >> H3 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 28 (Wiring Systems And Power Management - Component Connector End Views) >> Component Connector End Views >> Engine Control Module (ECM) X2
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Engine Control Module (ECM) X2

WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) X2 Connector End View
GM1673472Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2

Pin Wire Circuit Function
1 0.5 PU 2121 IC 1 Control
2 0.5 TN/WH 1653 HO2S Low Signal Sensor 1
3 0.5 D-GN 1655 HO2S High Signal - Sensor 1
4 0.5 PU/WH 1668 HO2S High Signal - Sensor 2
5 0.5 TN/WH 1669 HO2S Low Signal - Sensor 2
6-7 - - Not Used
8 0.35 L-BU 1876 Knock Sensor Signal
9 0.35 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 739 Ignition Voltage
14 0.5 BN 2198 CMP Actuator Solenoid Control
15-16 - - Not Used
17 0.5 L-BU 2123 IC 3 Control
18-22 - - Not Used
23 0.5 PK/BK 632 Low Reference
24 0.5 BK 2755 Low Reference
25-26 - - Not Used
27 0.5 D-BU/WH 1869 Low Reference
28 - - Not Used
29 0.5 TN 2752 Low Reference
30-31 - - Not Used
32 0.5 L-GN/BK 1745 Fuel Injector 2 Control (LLV)
0.5 L-BU/BK 844 Fuel Injector 4 Control (LLR)
33 0.5 D-GN/WH 2124 IC 4 Control (LLV)
0.5 D-GN 2125 IC 5 Control (LLR)
34-38 - - Not Used
39 0.35 OG 631 5-Volt Reference
40-41 - - Not Used
42 0.5 BK 2760 Low Reference
43 0.5 L-GN 1867 5-Volt Reference
44 0.5 GY 2701 5-Volt Reference
45 - - Not Used
46 0.35 TN 2199 Low Reference
47 - - Not Used
48 0.5 PK/BK 1746 Fuel Injector 3 Control
49-51 - - Not Used
52 0.5 L-GN/BK 1745 Fuel Injector 2 Control (LLR)
53 0.5 OG/WH 2122 IC 2 Control (LLV)
0.5 D-GN/WH 2124 IC 4 Control (LLR)
54 0.5 RD/WH 2122 IC 2 Control (LLR)
55-58 - - Not Used
59 0.5 TN 630 Low Reference
60-61 - - Not Used
62 0.5 L-BU 6289 IAT Sensor Signal
63 0.5 YE/BK 1868 CKP Sensor Signal
64 0.5 D-GN 485 TP Sensor 1 Signal
65 - - Not Used
66 0.5 PU 486 TP Sensor 2 Signal
67 0.5 YE 492 MAF Sensor Signal
68 0.5 D-GN 676 HO2S Heater High Control - Sensor 1
69 0.5 BK/WH 1423 HO2S Heater Low Control - Sensor 2
70 - - Not Used
71 0.5 L-BU/BK 844 Fuel Injector 4 Control (LLV)
0.5 BK/WH 845 Fuel Injector 5 Control (LLR)
72 0.5 BK 1744 Fuel Injector 1 Control
73 2 BK/WH 451 Ground
Connector Part Information 
  • OEM: 34566-7703
  • Service: See Catalog
  • Description: 73-Way F MX123 34566 Series (BK)
Terminal Part Information 
  • Pins: 1-9, 11-13, 16-19, 23, 24, 27, 29, 32-35, 39, 40, 42-44, 48, 49, 52-55, 59, 60, 62-64, 66, 72
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 73
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: 2/5
  • Release Tool/Test Probe: 12094430/J-35616-35 (VT)
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