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Engine Control Module (ECM) X3 (LH2)

Fig 1: Connector End View Engine Control Module (ECM) X3 (LH2)
GM1590596Courtesy of GENERAL MOTORS COMPANY
Engine Control Module (ECM) X3 (LH2)

Pin Wire Circuit Function
1-2 - - Not Used
3 0.5 TN/WH 3211 HO2S Low Signal (Bank 2 Sensor 1)
4 0.5 PU/WH 3210 HO2S High Signal (Bank 2 Sensor 1)
5 0.5 PU 3220 HO2S High Signal (Bank 2 Sensor 2)
6 0.5 TN 3221 HO2S Low Signal (Bank 2 Sensor 2)
7 0.5 OG 225 Generator Turn On Signal
8-14 - - Not Used
15 0.5 L-GN 3212 HO2S Heater Low Control (Bank 2 Sensor 1)
16-20 - - Not Used
21 0.35 BK/WH 2751 Low Reference
22 - - Not Used
23 0.5 OG/BK 469 Low Reference
24-28 - - Not Used
29 0.5 GY 23 Generator Field Duty Cycle Signal
30-32 - - Not Used
33 0.5 TN 2501 High Speed GMLAN Serial Data Bus -
34 - - Not Used
35 0.5 TN 2761 Low Reference
36 - - Not Used
37 0.5 GY 2700 5-Volt Reference 1
38 - - Not Used
39 0.5 GY 2704 5-Volt Reference 1
40-45 - - Not Used
46 0.5 OG/BK 1786 Park/Neutral Signal
47 - - Not Used
48 0.5 D-GN/WH 428 EVAP Canister Purge Solenoid Control
49 0.35 D-GN 335 Low Speed Cooling Fan Relay Control
50 0.5 OG/WH 3223 HO2S Heater Low Control (Bank 2 Sensor 2)
51-52 - - Not Used
53 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus +
54 - - Not Used
55 0.5 YE 410 ECT Sensor Signal
56 - - Not Used
57 0.5 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
58 - - Not Used
59 0.5 L-GN 432 MAP Sensor Signal
60-72 - - Not Used
73 2 BK/WH 1551 Ground
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 34566-0203
  • Service Connector: 88988372
  • Description: 73-Way F MX123 34566 Series (GY)
Terminal Part Information
  • Pins: 3, 4, 5, 6, 7, 15, 23, 29, 33, 35, 37, 39, 46, 48, 50, 53, 55, 57, 59
  • Terminated Lead: 13575575
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Pins: 21, 49
  • Terminated Lead: 13575811
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Pin: 73
  • Terminated Lead: 13576392
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: 2/5
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