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Home >> Cadillac >> 2007 >> DTS 4.6 9 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System & Fuel System - 4.6L - Introduction (2 Of 2) >> Component Locator >> Engine Control Module Connector End Views >> Engine Control Module (ECM) C3
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Engine Control Module (ECM) C3

Fig 1: Engine Control Module (ECM) C3 Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C3 Connector & Terminal Parts Information

Connector Part Information 
  • OEM: 34566-3103
  • Service: 88988612
  • Description: 73-Way F (GY)
Terminal Part Information 
  • Pins: 3, 4, 7, 8, 9, 18, 21, 23, 26, 29, 33, 35, 37, 39, 42, 46, 48, 49, 53, 55, 57, 59, 62, 65, 15
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 3, 4, 7, 8, 9, 18, 21, 23, 26, 29, 33, 35, 37, 39, 42, 46, 48, 49, 53, 55, 57, 59, 62, 65 - J/J
  • Core/Insulation Crimp: Pins 15 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C3 Terminal Identification

Pin Wire Color Circuit No. Function
1-2 - - Not Used
3 TN/WH 3211 HO2S Low Reference Bank 1 Sensor 1
4 PU/WH 3210 HO2S Reference Voltage Bank 1 Sensor 1
5-6 - - Not Used
7 OG 225 Generator Turn On Signal
8 L-GN 1652 Reverse Lockout Solenoid Control
9 WH/BK 436 AIR Pump Relay Control
10-14 - - Not Used
15 L-GN/WH 3112 HO2S Heater Low Control Bank 1 Sensor 1
16-17 - - Not Used
18 BN 1174 Oil Level Switch Signal
19-20 - - Not Used
21 L-BU 5514 Low Reference
22 - - Not Used
23 OG/BK 469 Low Reference
24-25 - - Not Used
26 WH/GY 6786 Low Reference
27-28 - - 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 PK 2761 Low Reference
36 - - Not Used
37 GY/BK 2700 5-Volt Reference 1
38 - - Not Used
39 GY/WH 2704 5-Volt Reference 1
40-41 - - Not Used
42 BN/WH 6790 5-Volt Reference 2
43-45 - - Not Used
46 GY/OG 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
50-52 - - 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/WH 380 A/C Refrigerant Pressure Sensor Signal
58 - - Not Used
59 L-GN/BK 432 MAP Sensor Signal
60-61 - - Not Used
62 YE/GY 6788 Air Injection Position Signal
63-64 - - Not Used
65 YE/D-GN 231 Oil Pressure Switch Signal
66-73 - - Not Used
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