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Engine Control Module (ECM) Connector End View C2

Fig 1: ECM C2 Connector
GM1650395Courtesy of GENERAL MOTORS CORP.
Engine Control Module Connector End Views

Connector Part Information 
  • OEM: 34566-0103
  • Service: 88988931
  • Description: 73-Way F (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: 13, 28, 45, 65
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 11, 12
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72 - J/J
  • Core/Insulation Crimp: Pins 11, 12 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C2

Pin Wire Color Circuit No. Function
1 PU 2121 IC 1 Control
2 TN/WH 3111 HO2S Low Reference (Bank 1 Sensor 1)
3 PU/WH 3110 HO2S Reference Voltage (Bank 1 Sensor 1)
4 PU 3120 HO2S High Signal (Bank 1 Sensor 2)
5 TN/WH 3121 HO2S Low Signal (Bank 1 Sensor 2)
6 L-BU 1876 Knock Sensor 2 Signal
7 GY 2303 Low Reference
8 D-BU 496 Knock Sensor (1) Signal
9 GY 1716 Low Reference
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 PK/BK 6395 Camshaft Position (CMP) Actuator Solenoid - Intake Bank 1 Control
15 TN/BK 6397 Camshaft Position (CMP) Actuator Solenoid - Intake Bank 2 Control
16 D-BU/WH 878 Fuel Injector 8 Control
17 OG/WH 2122 IC 2 Control
18 L-BU/WH 2126 IC 6 Control
19 BN/WH 2130 Low Reference
20 PU 6267 Low Reference
21 TN 6268 Low Reference
22 WH 6269 Low Reference
23 BN 6266 Low Reference
24 BK 2755 Low Reference
25 D-GN 7125 Super Charger Inlet Air Pressure Sensor Return
26 - - Not Used
27 GY/BK 6272 Low Reference
28 PK/BK 5290 Ignition 1 Voltage
29 TN 2752 Low Reference
30 BN/WH 6754 Low Reference
31 D-BU/WH 6756 Low Reference
32 PK/BK 1746 Fuel Injector 3 Control
33 OG 2127 IC 7 Control
34 D-GN 2125 IC 5 Control
35 BN 2129 Low Reference
36 D-GN 6457 Camshaft Position (CMP) Sensor - Exhaust Bank 1 Signal
37 OG 6260 Camshaft Position (CMP) Sensor - Intake Bank 2 Signal
38 PK 6261 Camshaft Position (CMP) Sensor - Exhaust Bank 2 Signal
39 D-GN 6259 Camshaft Position (CMP) Sensor - Intake Bank 1 Signal
40 GY 2705 5-Volt Reference
41 YE/BK 7124 5-Volt Reference
42 TN 2760 Low Reference
43 PU/WH 6270 5-Volt Reference
44 GY 2701 5-Volt Reference
45 BN 6273 Oil Temperature Sensor Low Reference
46 BN 6753 Low Reference
47 D-BU 6755 Low Reference
48 L-GN/BK 1745 Fuel Injector 2 Control
49 TN/WH 845 Fuel Injector 5 Control
50 WH/BK 6396 Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 1 Control
51 GY/BK 6394 Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 2 Control
52 L-BU/BK 844 Fuel Injector 4 Control
53 L-BU 2123 IC 3 Control
54 D-GN/WH 2124 IC 4 Control
55 PU/WH 2128 IC 5 Control
56 D-GN/WH 6264 5-Volt Reference
57 OG/BK 6263 5-Volt Reference
58 PK/BK 6262 5-Volt Reference
59 D-BU/WH 6265 5-Volt Reference
60 TN/WH 331 Oil Pressure Sensor Signal
61 - - Not Used
62 TN 472 IAT Sensor Signal
63 WH/BK 6271 CKP Sensor Signal
64 D-GN 485 TP Sensor 1 Signal
65 D-GN/WH 357 TCC Release Switch Signal
66 PU 486 TP Sensor 2 Signal
67 YE 492 MAF Sensor Signal
68 GY/WH 3113 HO2S Heater Low Control (Bank 1 Sensor 1)
69 GY/WH 3122 HO2S Heater Low Control (Bank 2 Sensor 1)
70 YE/BK 846 Fuel Injector 6 Control
71 OG/BK 877 Fuel Injector 7 Control
72 TN 1744 Fuel Injector 1Control
73 BK/WH 1551 Ground


Fig 1: ECM C2 Connector
GM1420560Courtesy of GENERAL MOTORS CORP.
Engine Control Module Connector End Views

Connector Part Information 
  • OEM: 15418475
  • Service: 88953274
  • Description: 73-Way F 108-A (BK)
Terminal Part Information 
  • Pins: 3, 4, 8, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 54, 55, 58, 59, 60, 61, 62, 63, 64, 65, 68, 69, 71
  • Terminal/Tray: 15359541/4
  • Core/Insulation Crimp: M/M
  • Release Tool/Test Probe: 15381651-2/J-35616-64B (L-BU)
  • Pins: 73
  • Terminal/Tray: 15304720/19
  • Core/Insulation Crimp: 4/5
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)
Engine Control Module (ECM) C2

Pin Wire Color Circuit No. Function
1-2 - - Not Used
3 D-GN 485 TP Sensor 1 Signal
4 PU 486 TP Sensor 2 Signal
5-7 - - Not Used
8 L-GN 432 MAP Sensor Signal
9 - - Not Used
10 YE 573 Crankshaft Position Sensor Signal (1)
11 L-BU 1876 Knock Sensor Signal (2)
12 GY 23 Generator Field Duty Cycle Signal
13 GY 1716 Knock Sensor Low Reference (1)
14 L-GN 5282 Camshaft Phaser Exhaust Solenoid (1)
15-16 - - Not Used
17 TN 1744 Fuel Injector 1 Control
18 L-GN/BK 1745 Fuel Injector 2 Control
19 D-BU 496 Knock Sensor 1 Signal
20 PK/BK 1746 Fuel Injector 3 Control
21 OG/BK 877 Fuel Injector 7 Control
22 TN/WH 845 Fuel Injector 5 Control
23 YE/BK 846 Fuel Injector 6 Control
24 D-BU/WH 878 Fuel Injector 8 Control
25 D-GN 5273 Camshaft Position Exhaust Sensor (1)
26 - - Not Used
27 BN/WH 5303 Camshaft Position Intake Sensor Low Reference (2)
28 GY 2303 Knock Sensor Low Reference (2)
29 PU 5284 Camshaft Phaser Intake Solenoid (1)
30 L-BU/BK 844 Fuel Injector Control (4)
31 OG/BK 5272 Camshaft Phaser Intake Solenoid (2)
32 OG 5275 Camshaft Position Intake Sensor (1)
33 D-BU 5300 Camshaft Position Intake Sensor Supply Voltage (1)
34 WH/BK 5283 Camshaft Phaser Exhaust Solenoid (2)
35 TN 5301 Camshaft Position Intake Sensor Low Reference (1)
36 OG/BK 469 Low Reference
37 TN 2752 Low Reference
38 TN 2761 Low Reference
39 BN/WH 2130 Low Reference
40 L-BU 5302 Camshaft Position Intake Sensor Supply Voltage (2)
41 PU 574 Low Reference
42 BN 2129 Low Reference
43 PU 5274 Camshaft Position Exhaust Sensor (2)
44 BN 582 TAC Motor Control - 2
45 GY 5296 Camshaft Position Exhaust Sensor Low Reference (1)
46 L-GN 5298 Camshaft Position Exhaust Sensor Supply Voltage (2)
47 BN 5299 Camshaft Position Exhaust Sensor Low Reference (2)
48 YE 581 TAC Motor Control - 1
49 YE 5276 Camshaft Position Intake Sensor (2)
50 L-GN 1867 12-Volt Reference
51 GY 2701 5-Volt Reference
52-53 - - Not Used
54 YE 410 ECT Sensor Signal
55 D-GN/WH 428 EVAP Canister Purge Solenoid Control
56-57 - - Not Used
58 PU 2121 IC 1 Control
59 OG/WH 2122 IC 2 Control
60 OG 2127 IC 7 Control
61 L-BU 2123 IC 3 Control
62 D-GN/WH 2124 IC 4 Control
63 PU/WH 2128 IC 8 Control
64 D-GN 2125 IC 5 Control
65 GY 2704 5-Volt Reference
66-67 - - Not used
68 OG 225 Generator Turn On Signal
69 L-BU/WH 2126 IC 6 Control
70 - - Not Used
71 YE/BK 5297 Camshaft Position Exhaust Sensor Supply Voltage (1)
72 - - Not Used
73 BK/WH 1551 Ground
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