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Engine Control Module (ECM) Connector End View C2

Fig 1: Engine Control Module (ECM) C2 Connector End View
GM1335545Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C2 Connector & Terminal Parts Information

Connector Part Information 
  • OEM: 34566-5903
  • Service: See Catalog
  • Description: 73-Way F Micro-Pack 64 Series Sealed (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: 1, 17, 23, 27, 33, 35, 39, 43, 53, 59, 63
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 2-5, 8, 9, 29, 32, 42, 44, 48, 62, 64, 66-69, 71, 72, 11-13
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 2-5, 8, 9, 29, 32, 42, 44, 48, 62, 64, 66-69, 71, 72 - J/J
  • Core/Insulation Crimp: Pins 11, 12, 13 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C2 Terminal Identification

Pin Wire Color Circuit No. Function
1 PU 2121 IC 1 Control
2 TN/WH 3111 HO2S Low Signal (Sensor 1)
3 PU/WH 3110 HO2S High Signal (Sensor 1)
4 PU/WH 1668 HO2S High Signal (Sensor 2)
5 TN/WH 1669 HO2S Low Signal (Sensor 2)
6-7 - - Not Used
8 D-BU 496 Knock Sensor Signal
9 GY 1716 Knock Sensor Signal
10 - - Not Used
11 YE 581 TAC Motor Control 1
12 BN 582 TAC Motor Control 2
13 PK/BK 5290 Ignition 1 Voltage
14-16 - - Not Used
17 L-BU 2123 IC 3 Control
18-22 - - Not Used
23 TN 5301 Low Reference
24-26 - - Not Used
27 PU 574 Low Reference
28 - - Not Used
29 BK 2752 Low Reference
30-31 - - Not Used
32 L-GN/BK 1745 Fuel Injector 2 Control
33 D-GN/WH 2124 IC 4 Control
34 - - Not Used
35 BN 2129 Low Reference
36-38 - - Not Used
39 D-BU 5300 5-Volt Reference
40-41 - - Not Used
42 BK 2760 Low Reference
43 L-GN 2867 5-Volt Reference
44 GY 2701 5-Volt Reference
45-47 - - Not Used
48 PK/BK 1746 Fuel Injector 3 Control
49-52 - - Not Used
53 RD/WH 2122 IC 2 Control
54-58 - - Not Used
59 OG 5275 CMP Sensor Signal
60-61 - - Not Used
62 TN 472 IAT Sensor Signal
63 YE 573 CKP Sensor Signal
64 D-GN 485 TP Sensor 1 Signal
65 - - Not Used
66 PU 486 TP Sensor 2 Signal
67 YE 492 MAF Sensor Signal
68 BK/WH 3113 HO2S Heater Low Control (Sensor 1)
69 BK/WH 3122 HO2S Heater Low Control (Sensor 2)
70 - - Not Used
71 L-BU/BK 844 Fuel Injector 4 Control
72 BK 1744 Fuel Injector 1 Control
73 BK/WH 451 Ground


Fig 1: Engine Control Module (ECM) C2 Connector End View
GM1335545Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C2 Connector & Terminal Parts Information

Connector Part Information 
  • OEM: 34566-2503
  • Service: 88988360
  • Description: 73-Way F Micro-Pack 64 Series Sealed (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: 1, 14, 17, 20, 23, 27, 30, 33, 35, 36, 39, 43, 46, 50, 53, 56, 59, 63
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 2-5, 8, 9, 29, 32, 42, 44, 48, 62, 64, 66-69, 71, 72, 11-13
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 2-5, 8, 9, 29, 32, 42, 44, 48, 62, 64, 66-69, 71, 72 - J/J
  • Core/Insulation Crimp: Pins 11, 11, 12, 12, 13, 13 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C2 Terminal Identification

Pin Wire Color Circuit No. Function
1 PU 2121 IC 1 Control
2 TN/WH 3111 HO2S Low Signal (Sensor 1)
3 PU/WH 3110 HO2S High Signal (Sensor 1)
4 PU/WH 1668 HO2S High Signal (Sensor 2)
5 TN/WH 1669 HO2S Low Signal (Sensor 2)
6-7 - - Not Used
8 D-BU 496 Knock Sensor Signal
9 GY 1716 Knock Sensor Signal
10 - - Not Used
11 YE/GN 581 TAC Motor Control 1 (Early Production)
YE 581 TAC Motor Control 1 (Late Production)
12 YE/GN 582 TAC Motor Control 2 (Early Production)
BN 582 TAC Motor Control 2 (Late Production)
13 YE/OG 5290 Ignition 1 Voltage (Early Production)
PK/BK 5290 Ignition 1 Voltage (Late Production)
14 PK/BK 6395 CMP Actuator Solenoid Control Intake
15-16 - - Not Used
17 L-BU 2123 IC 3 Control
18-19 - - Not Used
20 GY 5296 Low Reference
21-22 - - Not Used
23 TN 5301 Low Reference
24-26 - - Not Used
27 PU 574 Low Reference
28 - - Not Used
29 BK 2752 Low Reference
30 L-GN 5282 Low Reference
31 - - Not Used
32 L-GN/BK 1745 Fuel Injector 2 Control
33 D-GN/WH 2124 IC 4 Control
34 - - Not Used
35 BN 2129 Low Reference
36 YE/BK 5297 5-Volt Reference
37-38 - - Not Used
39 D-BU 5300 5-Volt Reference
40-41 - - Not Used
42 BK 2760 Low Reference
43 L-GN 2867 5-Volt Reference
44 GY 2701 5-Volt Reference
45 - - Not Used
46 PU 5284 Low Reference
47 - - Not Used
48 PK/BK 1746 Fuel Injector 3 Control
49 - - Not Used
50 WH/BK 6396 CMP Actuator Solenoid Control Exhaust
51-52 - - Not Used
53 RD/WH 2122 IC 2 Control
54-55 - - Not Used
56 D-GN 5273 CMP Sensor Signal
57-58 - - Not Used
59 OG 5275 CMP Sensor Signal
60-61 - - Not Used
62 TN 472 IAT Sensor Signal
63 YE 573 CKP Sensor Signal
64 D-GN 485 TP Sensor 1 Signal
65 - - Not Used
66 PU 486 TP Sensor 2 Signal
67 YE 492 MAF Sensor Signal
68 BK/WH 3113 HO2S Heater Low Control (Sensor 1)
69 BK/WH 3122 HO2S Heater Low Control (Sensor 2)
70 - - Not Used
71 L-BU/BK 844 Fuel Injector 4 Control
72 BK 1744 Fuel Injector 1 Control
73 BK/WH 451 Ground
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