LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 2009 >> Yukon Base, 4.8 C >> Repair and Diagnosis >> External Pages >> Different car >> Section 628 (Wiring Systems And Power Management - Component Connector End Views - Electronic Compass Module To Memory Seat Module (X4)) >> Component Connector End Views >> Engine Control Module (ECM) X3 (HP2)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine Control Module (ECM) X3 (HP2)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
GM1590596Courtesy of
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 15497996
  • Service Connector: 88988372
  • Description: 73-Way F 0.64 2.8 Series, Sealed (GY Encased in BK)
Terminal Part Information
  • Pins: 3-6, 8, 10, 11, 15, 21-23, 33, 35-39, 47-53, 55-59, 66-72
  • Terminated Lead: Pins 3-6, 8, 15, 22, 23, 33, 35, 36, 38, 39, 47, 48, 50-53, 55, 56, 58, 59, 66, 69, 70-72 - Service by Harness - See Part Catalog
  • Terminated Lead: Pins 10, 11, 21, 37, 49, 57, 66, 68, 69 - Service by Harness - See Part Catalog
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 3-6, 8, 15, 22, 23, 33, 35, 36, 38, 39, 47, 48, 50-53, 55, 56, 58, 59, 66, 69, 70-72 - J/J
  • Core/Insulation Crimp: Pins 10, 11, 21, 37, 49, 57, 66, 68, 69 - H/H
  • Pins: 73
  • Terminated Lead: 13576375
  • 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 (HP2)

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 Low Signal - Bank 2 Sensor 2
7 - - Not Used
8 0.5 D-BU 941 Cooling Pump Relay Control
9 - - Not Used
10 0.35 GY 5493 Valve Lifter Oil Manifold (VLOM) Assembly Cylinder 6 Shutoff Solenoid
11 0.35 D-BU 5491 Valve Lifter Oil Manifold (VLOM) Assembly Cylinder 1 Shutoff Solenoid
12-14 - - Not Used
15 0.5 L-GN 3212 HO2S Heater Low Control - Bank 2 Sensor 1
16-20 - - Not Used
21 0.35 TN 5514 Low Reference
22 0.5 OG/BK 469 Low Reference
23 0.5 OG/BK 469 Low Reference
24-32 - - Not Used
33 0.5 L-BU 6106 PTLAN -
34 - - Not Used
35 0.5 TN 2761 Low Reference
36 0.5 TN 955 Low Reference
37 0.35 GY 2700 5-Volt Reference 1
38 0.8 GY 2704 5-Volt Reference
39 0.5 GY 2704 5-Volt Reference 1
40-46 - - Not Used
47 0.5 TN 2501 High Speed GMLAN Serial Data Bus -
48 0.5 D-GN/WH 428 EVAP Canister Purge Solenoid Control
49 0.35 D-BU 473 Low Speed Cooling Fan Relay Control
50 0.5 OG/WH 3223 HO2S Heater Low Control - Bank 2 Sensor 2
51 0.5 TN 2501 High Speed GMLAN Serial Data Bus -
52 0.5 TN 2501 High Speed GMLAN Serial Data Bus -
53 0.5 D-BU 6105 PTLAN +
54 - - Not Used
55 0.5 YE 410 Engine Coolant Temperature (ECT) Sensor Signal
56 0.5 YE 954 5-Volt Reference
57 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
58 0.5 L-GN 432 Barometric Pressure Sensor Signal
59 0.5 L-GN 432 Manifold Absolute Pressure (MAP) Sensor Signal
60-65 - - Not Used
66 0.35 OG/BK 6399 Vehicle Speed Signal (without NQH)
0.5 PU/WH 821 Vehicle Speed Sensor (VSS) High Signal (NQH)
67 0.5 L-GN/BK 822 Vehicle Speed Sensor (VSS) Low Signal (NQH)
68 0.35 L-GN 5492 Valve Lifter Oil Manifold (VLOM) Assembly Cylinder 7 Shutoff Solenoid
69 0.35 OG 5494 Valve Lifter Oil Manifold (VLOM) Assembly Cylinder 4 Shutoff Solenoid
70 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus +
71 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus +
72 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus +
73 3 BK/WH 451 Ground
scientia non olet · About LEMON Manuals