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HOMESERVICE MANUALSCADILLAC2011CTS V, 2D COUPE, STANDARDREPAIR AND DIAGNOSISELECTRICALWIRING DIAGRAMSWIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - DOOR HANDLE SWITCH THROUGH FOG LAMPCOMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X3 (LF1) CONNECTOR END VIEW
2011 Cadillac CTS V, 2D Coupe, Standard

Engine Control Module (ECM) X3 (LF1) Connector End View

2011 Cadillac CTS V, 2D Coupe, StandardSECTION Engine Control Module (ECM) X3 (LF1) Connector End View
Fig 1: Engine Control Module (ECM) X3 (LF1) Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X3 (LF1)

Pin Wire Circuit Function
1 0.5 TN/WH 331 Oil Pressure Sensor Signal
2 0.5 GY 596 5-Volt Reference 1
3-7 - - Not Used
8 0.5 YE 410 Engine Coolant Temperature (ECT) Sensor Signal
9 - - Not Used
10 0.5 GY 605 5-Volt Reference2
11-12 - - Not Used
13 0.5 L-BU/WH 2126 IC 6 Control
14 0.5 D-GN 2125 IC 5 Control
15 0.5 BN/WH 2130 Low Reference
16 0.75 YE 7301 High Pressure Fuel Pump Actuator Solenoid Control
17 0.5 TN 470 Low Reference
18-23 - - Not Used
24 0.5 TN 476 Low Reference
25 0.5 TN 452 Low Reference
26 0.5 YE 573 CKP Sensor Signal
27 0.5 D-GN/WH 2124 IC 4 Control
28 0.5 L-BU 2123 IC 3 Control
29 0.5 OG/WH 2122 IC 2 Control
30 0.5 PU 2121 IC 1 Control
31 0.5 BN 2129 Low Reference
32 0.75 PU 7300 High Pressure Fuel Pump Actuator Low Control
33 0.5 OG 5275 CMP Sensor Signal
34 0.5 D-BU 5300 5-Volt Reference 1
35 0.5 D-GN 5273 CMP Sensor Signal Exhaust - Bank 1
36 0.5 YE 5276 CMP Sensor Signal Intake - Bank 2
37 0.5 L-BU 5302 5-Volt Reference 1
38 0.5 PU 5274 CMP Sensor Signal Exhaust - Bank 2
39 0.5 PU 5284 Low Reference
40 0.5 L-GN 5282 Low Reference
41 0.5 OG/BK 5272 CMP Actuator Solenoid Control - Intake Bank 2
42 0.5 WH/BK 5283 CMP Actuator Solenoid Control - Exhaust Bank 2
43-45 - - Not Used
46 0.75 BU 4804 Low Reference
47 0.75 GN 4805 Low Reference
48 0.75 BU 4802 Low Reference
49 - - Not Used
50 0.75 GN 4803 Low Reference
51 0.75 PU 4806 Low Reference
52 0.75 BN 4801 Low Reference
53 0.5 TN 5301 Low Reference
54 0.5 YE/BK 5297 5-Volt Reference 1
55 0.5 GY 5296 Low Reference
56 0.5 BN/WH 5303 Low Reference
57 0.5 L-GN 5298 5-Volt Reference 1
58 0.5 BN 5299 Low Reference
59 0.5 BN 6753 Low Reference
60 0.5 BN/WH 6754 Low Reference
61 0.5 D-BU 6755 Low Reference
62 0.5 D-BU/WH 6756 Low Reference
63-65 - - Not Used
66 0.75 BU/WH 4904 Fuel Injector 4 Control
67 0.75 GN/WH 4905 Fuel Injector 5 Control
68 0.75 BU/WH 4902 Fuel Injector 2 Control
69 - - Not Used
70 0.75 GN/WH 4903 Fuel Injector 3 Control
71 0.75 PU/WH 4906 Fuel Injector 6 Control
72 0.75 BN/WH 4901 Fuel Injector 1 Control
73 2 BK/WH 1551 Ground
Connector Part Information 
  • Harness Type: Engine
  • OEM Connector: 12582678
  • Service Connector: 88988372
  • Description: 73-Way F 0.64 2.8 Series, Sealed (BK)
Terminal Part Information 
  • Pins: 1, 2, 8, 10, 13-15, 17, 24, 25-31, 33-42, 53-62
  • 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: 16, 32, 46-48, 50-52, 66-68, 70-72
  • Terminated Lead: 13575575
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: K/K
  • Pins: 73
  • Terminated Lead: SEALED: 13576392 UNSEALED: 13575797
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: 2/5
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.