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Engine Control Module (ECM) X2 Connector End View

Fig 1: Engine Control Module (ECM) X2 Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2

Pin Wire Circuit Function
1 - - Not Available
2 0.5 WH 5268 Overrun Air Valve Solenoid
3 0.35 PU 421 Air Injection Reaction Solenoid Relay Coil Control
4 0.5 TN 2761 Low Reference
5 0.35 GY/BK 6272 Low Reference
6 0.5 TN 1744 Fuel Injector 1 Control
7 0.5 L-GN/BK 1745 Fuel Injector 2 Control
8 0.5 PK/BK 1746 Fuel Injector 3 Control
9 0.35 YE 2174 Low Reference
10 0.5 L-BU/BK 844 Fuel Injector 4 Control
11 0.5 TN/WH 845 Fuel Injector 5 Control
12 0.5 YE/BK 846 Fuel Injector 6 Control
13 0.5 GY 2704 5-Volt Reference 1
14 - - Not Available
15 0.35 BN 2198 Camshaft Position Actuator Solenoid High Control
16 0.5 YE 581 TAC Motor Control - 1
17-19 - - Not Available
20 0.35 PK/BK 632 Low Reference
21 - - Not Available
22 0.35 PU 2121 IC 1 Control
23 0.35 OG/WH 2122 IC 2 Control
24 0.35 L-BU 2123 IC 3 Control
25-29 - - Not Available
30 0.35 D-GN/WH 428 EVAP Canister Purge Solenoid Control
31 0.5 OG 225 Generator Turn On Signal
32 0.5 BN 582 TAC Motor Control - 2
33 0.35 D-BU 6259 5-Volt Reference 1
34 - - Not Available
35 0.5 GY 2705 5-Volt Reference 1
36 0.5 TN/WH 331 Oil Pressure Sensor Signal
37 0.5 PU/WH 3110 HO2S High Signal Sensor 1
38 - - Not Available
39 0.5 L-GN 432 MAP Sensor Signal
40 0.5 TN 2752 Low Reference
41 0.5 BK 2755 Low Reference
42 - - Not Available
43 0.5 GY 23 Generator Field Duty Cycle Signal
44 - - Not Available
45 0.35 WH/BK 6271 CKP Sensor Signal
46 0.35 BN/WH 633 CMP Sensor Signal
47 - - Not Available
48 0.5 TN/WH 3111 HO2S Low Signal Sensor 1
49 0.5 OG/BK 469 Low Reference
50 0.5 GY 1716 KS 1 Signal
51 0.5 D-BU 496 KS 1 Signal
52 - - Not Available
53 0.5 GY 2701 5-Volt Reference 2
54 0.35 PU/WH 6270 5-Volt Reference 2
55 0.5 GY 474 5 Volt Reference 2
56 - - Not Available
57 0.5 D-GN 485 TP Sensor 1 Signal
58 0.35 YE 410 ECT Sensor Signal
59 0.5 PU 486 TP Sensor 2 Signal
60 0.35 TN 2199 Low Reference
61-63 - - Not Available
64 0.5 TN 476 Low Reference
65 0.5 GY/WH 3113 HO2S Heater Low Control Sensor 1
66-69 - - Not Available
70 0.5 GY 2303 KS 2 Signal
71 0.5 L-BU 1876 KS 2 Signal
72 - - Not Available
73 2 BK/WH 451 Ground
Connector Part Information 
  • Harness Type: Engine
  • OEM Connector: 34566-0203
  • Service Connector: 88988372
  • Description: 73-Way F MX123 34566 Series (GY Encased in BK)
Terminal Part Information 
  • Pins: 2, 4, 6-8, 10-13, 16, 31, 32, 35-37, 39-41, 43, 48-51, 53, 55, 57, 59, 64, 65, 70, 71
  • Terminated Lead: 13575575
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Pins: 3, 5, 9, 15, 20, 22-24, 30, 33, 45, 46, 54, 58, 60
  • Terminated Lead: 13575811
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Pin: 73
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: 2/5
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