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Home >> Cadillac >> 2007 >> CTS V >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 6.0L - 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
GM1581643Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) - C3 Connector Parts Information

Connector Part Information 
  • OEM: 34566-7003
  • Service: 88988372
  • Description: 73-Way F (D-GY) (Encased in BK)
Terminal Part Information 
  • Pins: 73
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: 2/5
  • Release Tool/Test Probe: 12094430/J-35616-35 (VT)
  • Pins: 12, 17, 33, 47, 49, 53
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 3, 4, 5, 6, 15, 50, 7, 8, 13, 18, 21, 23, 29, 35, 36, 37, 39, 48, 55, 56, 57, 59, 66, 67
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 3, 4, 5, 6, 15, 50 - K/K
  • Core/Insulation Crimp: Pins 7, 8, 13, 18, 21, 23, 29, 35, 36, 37, 39, 48, 55, 56, 57, 59, 66, 67 - J/J
  • 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 1667 HO2S Low Signal - Bank 2 Sensor 1
4 PU 1666 HO2S High Signal - Bank 2 Sensor 1
5 PU 1670 HO2S High Signal - Bank 2 Sensor 2
6 TN 1671 HO2S Low Signal - Bank 2 Sensor 2
7 OG 225 Generator Turn On Signal
8 L-GN 1652 Reverse Lockout Solenoid Control
9-11 - - Not Used
12 TN/BK 464 Delivered Torque Signal
13 GY 587 Skip/Shift Solenoid Control
14 - - Not Used
15 L-GN 3212 HO2S Heater Low Control - Bank 2 Sensor 1
16 - - Not Used
17 OG/BK 463 Requested Torque Signal
18 BN 1174 Oil Level Switch Signal
19-20 - - 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 OG/BK 1057 Low Reference
37 GY 2700 5-Volt Reference
38 - - Not Used
39 GY 2704 5-Volt Reference
40-46 - - Not Used
47 PU/WH 1035 Starter Relay Coil Supply Voltage
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 YE/BK 1227 TFT Sensor Signal
57 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
58 - - Not Used
59 L-GN 432 MAP Sensor Signal
60-65 - - Not Used
66 PU/WH 821 VSS High Signal
67 L-GN/BK 822 VSS Low Signal
68-72 - - Not Used
73 BK 750 Ground
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