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Home >> Cadillac >> 2006 >> STS V >> Repair and Diagnosis >> External Pages >> Different car >> Section 135 (Engine Control System & Fuel System - 4.6L - Introduction (2 Of 2)) >> Component Locator >> Engine Control Module Connector End Views >> Engine Control Module (ECM) C3

Engine Control Module (ECM) C3

WARNING: This page is about a different car, the 2007 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) C3 Connector End Views
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C3 Connector Parts Information

Connector Part Information 
  • OEM: 12582678
  • Service: 88988372
  • Description: 73-Way F Receptacle 0.64 2.8 Sealed (BK)
Terminal Part Information 
  • Pins: 73
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: A/5
  • Release Tool/Test Probe: 12094430/J-35616-35 (VT)
  • Pins: 7, 21, 23, 29, 35, 37, 39, 46, 49, 55, 57, 59
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 3-6,15, 33, 48, 50, 53
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 3-4, 33, 48, 53 - J/J
  • Core/Insulation Crimp: Pins 5-6, 15, 50 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C3 Connector Terminal Identification

Pin Wire Color Circuit No. Function
1-2 - - Not Used
3 TN/WH 3211 HO2S Low Reference (Bank 2 Sensor 1)
4 PU/WH 3210 HO2S Reference Voltage (Bank 2 Sensor 1)
5 PU 3220 HO2S High Signal (Bank 2 Sensor 2)
6 TN 3221 HO2S Low Signal (Bank 2 Sensor 2)
7 OG 225 Generator Turn On Signal
8-14 - - Not Used
15 L-GN 3212 HO2S Heater Low Control [- Bank 2 Sensor 1]
16-20 - - Not Used
21 TN 5514 Low Reference
22 - - Not Used
23 OG/BK 469 Low Reference
24-28 - - Not Used
29 GY 23 Generator Field Duty Cycle Signal
30-32 - - Not Used
33 TN 2501 High Speed GMLAN Serial Data Bus-
34 - - Not Used
35 TN 2761 Low Reference
36 - - Not Used
37 GY 2700 5-Volt Reference
38 - - Not Used
39 GY 2704 5-Volt Reference
40-45 - - Not Used
46 OG/BK 1786 Park/Neutral Signal
47 - - Not Used
48 D-GN/WH 428 EVAP Canister Purge Solenoid Control
49 D-GN 335 Low Speed Cooling Fan Relay Control
50 OG/WH 3223 HO2S Heater Low Control (Bank 2 Sensor 2)
51-52 - - Not Used
53 TN/BK 2500 High Speed GMLAN Serial Data Bus+
54 - - Not Used
55 YE 410 ECT Sensor Signal
56 - - Not Used
57 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
58 - - Not Used
59 L-GN 432 MAP Sensor Signal
60-72 - - Not Used
73 BK 1550 Ground
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