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Engine Control Module (ECM) X3 (LS9)

GM1650395Courtesy of
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 34566-1683
  • Service Connector: 88988372
  • Description: 73-Way F MX123 34566 Series Sealed (BK with GY Terminal Position Assurance Lock)
Terminal Part Information
  • Pins: 3-6, 7, 13, 15, 22, 23, 38, 39, 48, 50, 58, 59
  • Terminated Lead: 13575812
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Pins: 7, 14, 16, 21, 27-37, 43, 49, 53-57, 63-67
  • 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: 13579770
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: A/5
Engine Control Module (ECM) X3 (LS9)

Pin Wire Circuit Function
1-2 - - Not Used
3 0.5 TN 1667 HO2S Low Signal - Bank 2 Sensor 1
4 0.5 PU 1666 HO2S High Signal - Bank 2 Sensor 1
5 0.5 PU 1670 HO2S High Signal - Bank 2 Sensor 2
6 0.5 TN 1671 HO2S Heater Low Control Bank 2 Sensor 2
7 0.35 OG 225 Generator Turn On Signal
8 0.5 L-GN 1652 Reverse Lockout Solenoid Control
9-12 - - Not Used
13 0.5 GY 587 Skip/Shift Solenoid Control
14 0.35 GY 1724 Boost Control Solenoid Control
15 0.5 L-GN 3212 HO2S Heater Low Control - Bank 2 Sensor 1
16 0.35 PK 2014 Coolant Pump Relay Control
17-20 - - Not Used
21 0.35 BK/WH 2751 Low Reference
22 0.5 OG/BK 6014 Low Reference
23 0.5 OG/BK 469 Low Reference
24-26 - - Not Used
27 0.35 D-GN/WH 6294 Low Reference
28 - - Not Used
29 0.35 GY 23 Generator Field Duty Cycle Signal
30-32 - - Not Used
33 0.35 TN 2501 High Speed GMLAN Serial Data Bus (-)
34 - - Not Used
35 0.35 TN 2761 Low Reference
36 0.35 YE/BK 6120 Low Reference
37 0.35 GY 2700 5-Volt Reference
38 0.5 WH/BK 2932 5-Volt Reference
39 0.5 GY 2704 5-Volt Reference
40-42 - - Not Used
43 0.35 D-GN 6293 5-Volt Reference
44-47 - - Not Used
48 0.5 D-GN/WH 428 VAP Canister Purge Solenoid Valve Control
49 0.35 D-GN 335 Cooling Fan Speed Control
50 0.5 OG/WH 3223 HO2S Heater Low Control - Bank 2 Sensor 2
51-52 - - Not Used
53 0.35 TN/BK 2500 High Speed GMLAN Serial Data Bus (+)
54 - - Not Used
55 0.35 YE 410 Engine Coolant Temperature Sensor Signal
56 0.35 L-BU 6118 Manifold Air Temperature Sensor Signal
57 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
58 0.5 GY/BK 433 BARO Sensor Signal
59 0.5 L-GN 432 Turbocharger Boost Sensor Signal
60-62 - - Not Used
63 0.35 D-BU 6306 Clutch Pedal Position Sensor Signal
64-65 - - Not Used
66 0.35 YE 400 Vehicle Speed Sensor (VSS) High Signal
67 0.35 OU 401 Vehicle Speed Signal (VSS) Low Signal
68-72 - - Not Used
73 3.0 BK/WH 451 Ground
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