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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 2074 (Wiring Systems And Power Management - Component Connector End Views Part 2) >> Engine Control Module (ECM) X2 (4.3L)
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Engine Control Module (ECM) X2 (4.3L)

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) X2 (4.3L) Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (4.3L)

Pin Wire Circuit Function
1-3 - - Not Used
4 0.5 TN 2761 Low Reference
5 0.35 GY/BK 6272 Low Reference
6 0.5 TN 1744 Fuel Injector 1 Control
7 0.5 YE/BK 846 Fuel Injector 6 Control
8 0.5 TN/WH 845 Fuel Injector 5 Control
9 0.5 BN 2129 Low Reference
10 0.5 L-BU/BK 844 Fuel Injector 4 Control
11 0.5 PK/BK 1746 Fuel Injector 3 Control
12 0.5 L-GN/BK 1745 Fuel Injector 2 Control
13 0.5 GY 2704 5-Volt Reference 1
14-15 - - Not Used
16 0.5 YE 581 TAC Motor Control - 1
17-19 - - Not Used
20 0.35 BN 6266 Low Reference
21 - - Not Used
22 0.5 PU 2121 IC 1 Control
23 0.5 L-BU 2123 IC 3 Control
24 0.5 OG/WH 2122 IC 2 Control
25-29 - - Not Used
30 0.5 D-GN/WH 428 EVAP Canister Purge Solenoid Control
31 0.5 BN 25 Charge Indicator Signal
32 0.5 BN 582 TAC Motor Control - 2
33 0.35 D-BU 6259 5-Volt Reference 1
34 - - Not Used
35 0.5 GY 2705 5-Volt Reference 1
36 0.5 TN/WH 331 Oil Pressure Sensor Signal
37 0.5 PU/WH 1665 HO2S High Signal Bank 1 Sensor 1
38 0.5 PU 1666 HO2S High Signal Bank 2 Sensor 1
39 0.5 L-GN 432 MAP Sensor Signal
40 0.35 TN 2752 Low Reference
41 0.5 BK 2755 Low Reference
42 - - Not Used
43 0.5 GY 23 Generator Field Duty Cycle Signal
44 - - Not Used
45 0.35 WH/BK 6271 CKP Sensor Signal
46 0.35 D-BU/WH 6265 CMP Sensor Signal
47 - - Not Used
48 0.5 TN 1664 HO2S Low Signal Bank 1 Sensor 1
49 0.5 OG/BK 469 Low Reference
50 0.5 GY 1716 KS 1 Signal
51 0.5 D-BU 496 KS 1 Signal
52 - - Not Used
53 0.35 GY 2701 5-Volt Reference 2
54 0.35 PU/WH 6270 5-Volt Reference 2
55-56 - - Not Used
57 0.35 D-GN 485 TP Sensor 1 Signal
58 0.5 YE 410 ECT Sensor Signal
59 0.35 PU 486 TP Sensor 2 Signal
60-64 - - Not Used
65 0.5 GY/WH 3113 HO2S Heater Low Control Bank 1 Sensor 1
66 0.5 L-GN 3212 HO2S Heater Low Control Bank 2 Sensor 1
67 - - Not Used
68 0.5 TN 1667 HO2S Low Signal Bank 2 Sensor 1
69 - - Not Used
70 0.5 GY 2303 KS 2 Signal
71 0.5 L-BU 1876 KS 2 Signal
72 - - Not Used
73 3 BK/WH 451 Ground
Connector Part Information 
  • OEM: 15497996
  • Service: 88988372
  • Description: 73-Way F 0.64 2.8 Series Sealed (GY)
Terminal Part Information 
  • Pins: 4, 6-13, 16, 22-24, 30-32, 35-39, 41, 43, 48-51, 58, 65-66, 68, 70-71
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 5, 20, 33, 44-46, 53-54, 57, 59
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 73
  • Terminal/Tray: 1326030-8/17
  • Core/Insulation Crimp: 4/D
  • Release Tool/Test Probe: 12094429/J-35616-4A (PU)
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