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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) X2 (LF1) CONNECTOR END VIEW
2011 Cadillac CTS V, 2D Coupe, Standard

Engine Control Module (ECM) X2 (LF1) Connector End View

2011 Cadillac CTS V, 2D Coupe, StandardSECTION Engine Control Module (ECM) X2 (LF1) Connector End View
Fig 1: Engine Control Module (ECM) X2 (LF1) Connector End View
GM1590592Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (LF1)

Pin Wire Circuit Function
1-2 - - Not Used
3 0.5 TN 808 Low Reference
4-7 - - Not Used
8 0.5 PU/WH 821 Vehicle Speed Sensor (VSS) High Signal (MV7)
9 - - Not Used
10 0.5 PU/WH 3110 Reference Voltage - Bank 1 Sensor 1
11 0.5 PU/WH 3210 HO2S Reference Voltage - Bank 2 Sensor 1
12 0.5 PU 3120 HO2S High Signal - Bank 1 Sensor 2
13 0.5 PU 3220 HO2S High Signal - Bank 2 Sensor 2
14-15 - - Not Used
16 0.5 BN 582 TAC Motor Control - 2
17 - - Not Used
18 0.5 GY 598 5-Volt Reference 1
19 0.5 YE 2918 Fuel Rail Pressure (FRP) Sensor Signal
20-22 - - Not Used
23 0.5 L-GN 5007 Backup Lamp Switch Signal
24-25 - - Not Used
26 0.5 TN/WH 3111 Low Reference - Bank 1 Sensor 1
27 0.5 TN/WH 3211 HO2S Low Signal - Bank 2 Sensor 1
28 0.5 TN/WH 3121 Low Reference - Bank 1 Sensor 2
29 0.5 TN 3221 Low Reference - Bank 2 Sensor 2
30-31 - - Not Used
32 0.5 YE 581 TAC Motor Control - 1
33 0.5 D-GN 485 TP Sensor 1 Signal
34 0.5 GY 2701 5-Volt Reference 4
35 0.5 PU 486 TP Sensor 2 Signal
36 0.5 D-BU 496 Knock Sensor (KS) 1 Signal
37 0.5 L-BU 1876 Knock Sensor (KS) 2 Signal
38-40 - - Not Used
41 0.5 GY/WH 3113 HO2S Heater Low Control - Bank 1 Sensor 1
42 0.5 GY/WH 3122 HO2S Heater Low Control - Bank 1 Sensor 2
43 0.5 L-GN 432 MAP Sensor Signal
44 0.5 GY 2704 5-Volt Reference 3
45-48 - - Not Used
49 0.5 L-BU 6289 Intake Air Temperature (IAT) Sensor Signal
50 - - Not Used
51 0.5 D-GN/WH 428 EVAP Canister Purge Solenoid Control
52 0.5 YE 492 MAF Sensor Signal
53 0.5 OG 225 Generator Turn On Signal
54 0.5 TN 2752 Low Reference
55 0.5 GY 23 Generator Field Duty Cycle Signal
56 0.5 GY 1716 Low Reference
57 0.5 GY 2303 Low Reference
58 0.5 OG/BK 1786 Transmission Park/Neutral Signal
59-60 - - Not Used
61 0.5 L-GN 3212 HO2S Heater Low Control - Bank 2 Sensor 1
62 0.5 OG/WH 3223 HO2S Heater Low Control - Bank 2 Sensor 2
63 0.5 OG/BK 469 Low Reference
64-68 - - Not Used
69 0.5 TN 2760 Low Reference
70-72 - - Not Used
73 2 BK/WH 1551 Ground
Connector Part Information 
  • Harness Type: Engine
  • OEM Connector: 12582677
  • Service Connector: 88988931
  • Description: 73-Way F 0.64 2.8 Series, Sealed (BK)
Terminal Part Information 
  • Pins: 1-72
  • Terminated Lead: 13575575
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • 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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When to See a Mechanic

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.