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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1844 (Engine Controls And Fuel - 2.4L (Lat) - 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 Saturn Vue. 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: 34566-0203
  • Service: 88988361
  • Description: 73-Way F GT 280 Series Micro 64 Sealed (GY)
Terminal Part Information 
  • Pins: 7, 21, 23, 29, 33, 35, 37, 39, 47, 48, 49, 53, 55, 57, 59, 65
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 28, 44
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: 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 - - Not Used
2 PK 1224 Transmission Fluid Pressure Switch Signal Bit 1
3-20 - - Not Used
21 BK 2751 Low Reference
22 - - Not Used
23 OG/BK 469 Low Reference
24 TN/BK 6033 Master Cylinder Pressure Sensor Low Reference
25-27 - - Not Used
28 BK/WH 1704 Low Reference
29 L-GN 66 A/C Request Signal l
30-32 - - Not Used
33 TN 2501 High Speed GMLAN Serial Data (-)
34 - - Not Used
35 BK 2761 Low Reference
36 PU 719 Low Reference
37 GY 2700 5-Volt Reference - 1
38 - - Not Used
39 GY 2704 5-Volt Reference - 1
40 GY 6043 Steering Angle Sensor Signal
41-43 - - Not Used
44 L-BU/BK 1688 5-Volt Reference - 2
45-46 - - Not Used
47 YE 1737 Neutral Safety Switch Park/Neutral 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 (+)
54 - - Not Used
55 YE 410 ECT Sensor Signal
56 GY 731 A/C Refrigerant Low Temperature Sensor Signal
57 RD/BK 380 A/C Refrigerant Pressure Sensor Signal
58 - - Not Used
59 L-GN 432 MAP Sensor Signal
60 YE 2034 Master Cylinder Pressure Sensor Signal (1)
61-64 - - Not Used
65 TN/BK 231 Oil Pressure Switch Signal
66-73 - - Not Used
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