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Engine Control Module (ECM) Connector End View C3

Fig 1: Engine Control Module (ECM) C3 Connector End View
GM1335545Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C3 Connector & Terminal Parts Information

Connector Part Information 
  • OEM: 34566-6003
  • Service: See Catalog
  • Description: 73-Way F Micro-Pack 64 Series Sealed (GY)
Terminal Part Information 
  • Pins: 7, 29, 35, 48, 55, 65-67
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 21, 23, 33, 37, 39, 47, 49, 53, 57, 59
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • 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
1-6 - - Not Used
7 RD 225 Generator Turn On Signal
8-20 - - Not Used
21 BK 2751 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 BK 2761 Low Reference
36 - - Not Used
37 GY 2700 5-Volt Reference (C60)
38 - - Not Used
39 GY 2704 5-Volt Reference
40-46 - - Not Used
47 D-GN 1433 PNP/Clutch Start Switch Signal
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/WH 2500 High Speed GMLAN Serial Data Bus +
54 - - Not Used
55 YE 410 ECT Sensor Signal
56 - - Not Used
57 RD/BK 380 A/C Refrigerant Pressure Sensor Signal (C60)
58 - - Not Used
59 L-GN 432 MAP Sensor Signal
60-64 - - Not Used
65 TN/BK 231 Oil Pressure Sensor Signal
66 YE 400 VSS Signal High (M86)
67 PU 401 VSS Signal Low (M86)
68-73 - - Not Used


Fig 1: Engine Control Module (ECM) C3 Connector End View
GM1335545Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C3 Connector & Terminal Parts Information

Connector Part Information 
  • OEM: 34566-2603
  • Service: 88988361
  • Description: 73-Way F Micro-Pack 64 Series Sealed (GY)
Terminal Part Information 
  • Pins: 7, 28, 29, 35, 44, 48, 55, 65-67
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 21, 23, 33, 37, 39, 47, 49, 53, 57, 59
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • 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
1-6 - - Not Used
7 RD 225 Generator Turn On Signal
8-20 - - Not Used
21 BK 2751 Low Reference
22 - - Not Used
23 OG/BK 469 Low Reference
24-27 - - Not Used
28 BK/WH 1704 Low Reference
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 BK 2761 Low Reference
36 - - Not Used
37 GY 2700 5-Volt Reference (C60)
38 - - Not Used
39 GY 2704 5-Volt Reference
40-43 - - Not Used
44 L-BU/BK 1688 5-Volt Reference
45-46 - - Not Used
47 D-GN 1433 PNP/Clutch Start Switch Signal
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/WH 2500 High Speed GMLAN Serial Data Bus +
54 - - Not Used
55 YE 410 ECT Sensor Signal
56 - - Not Used
57 RD/BK 380 A/C Refrigerant Pressure Sensor Signal (C60)
58 - - Not Used
59 L-GN 432 MAP Sensor Signal
60-64 - - Not Used
65 TN/BK 231 Oil Pressure Sensor Signal
66 YE 400 VSS Signal High (M86)
67 PU 401 VSS Signal Low (M86)
68-73 - - Not Used
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