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Engine Control Module (ECM) X2 (LH2)

Fig 1: Connector End View Engine Control Module (ECM) X2 (LH2)
GM1673472Courtesy of GENERAL MOTORS COMPANY
Engine Control Module (ECM) X2 (LH2)

Pin Wire Circuit Function
1 0.5 PU 2121 IC 1 Control
2 0.5 TN/WH 3111 HO2S Low Signal (Bank 1 Sensor 1)
3 0.5 PU/WH 3110 HO2S High Signal (Bank 1 Sensor 1)
4 0.5 PU 3120 HO2S High Signal (Bank 1 Sensor 2)
5 0.5 TN/WH 3121 HO2S Low Signal (Bank 1 Sensor 2)
6 0.5 L-BU 1876 Knock Sensor 2 Signal
7 0.5 GY 2303 Knock Sensor 2 Signal
8 0.5 D-BU 496 Knock Sensor 1 Signal
9 0.5 GY 1716 Knock Sensor 1 Signal
10 - - Not Available
11 0.75 YE 581 TAC Motor Control - 1
12 0.75 BN 582 TAC Motor Control - 2
13 0.5 PK/BK 5290 Ignition 1 Voltage
14 0.5 PK/BK 6395 Camshaft Position (CMP) Actuator Solenoid - Intake Bank 1 Control
15 0.5 TN/BK 6397 Camshaft Position (CMP) Actuator Solenoid - Intake Bank 2 Control
16 0.5 D-BU/WH 878 Fuel Injector 8 Control
17 0.5 OG/WH 2122 IC 2 Control
18 0.5 L-BU/WH 2126 IC 6 Control
19 0.5 BN/WH 2130 Low Reference
20 0.5 PU 6267 Low Reference
21 0.5 TN 6268 Low Reference
22 0.5 WH 6269 Low Reference
23 0.5 BN 6266 Low Reference
24 0.5 BK 2755 Low Reference
25 - - Not Used
26 - - Not Available
27 0.5 GY/BK 6272 Low Reference
28 0.5 PK/BK 5290 Ignition 1 Voltage
29 0.5 TN 2752 Low Reference
30 0.5 BN/WH 6754 Low Reference
31 0.5 D-BU/WH 6756 Low Reference
32 0.5 L-BU/BK 1746 Fuel Injector 3 Control
33 0.5 OG 2127 IC 7 Control
34 0.5 D-GN 2125 IC 5 Control
35 0.5 BN 2129 Low Reference
36 0.5 D-GN 6457 5-Volt Reference 1
37 0.5 OG 6260 5-Volt Reference 1
38 0.5 PK 6261 5-Volt Reference 1
39 0.5 D-BU 6259 5-Volt Reference 1
40 0.5 GY 2705 5-Volt Reference 1
41 - - Not Used
42 0.5 TN 2760 Low Reference
43 0.5 PU/WH 6270 5-Volt Reference 2
44 0.5 GY 2701 5-Volt Reference 2
45 - - Not Used
46 0.5 BN 6753 Low Reference
47 0.5 D-BU 6755 Low Reference
48 0.5 L-GN/BK 1745 Fuel Injector 2 Control
49 0.5 TN/WH 845 Fuel Injector 5 Control
50 0.5 WH/BK 6396 Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 1 Control
51 0.5 GY/BK 6394 Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 2 Control
52 0.5 L-BU/BK 844 Fuel Injector 4 Control
53 0.5 L-BU 2123 IC 3 Control
54 0.5 D-GN/WH 2124 IC 4 Control
55 0.5 PU/WH 2128 IC 8 Control
56 0.5 D-GN/WH 6264 Camshaft Position (CMP) Sensor - Exhaust Bank 1 Signal
57 0.5 OG/BK 6263 Camshaft Position (CMP) Sensor - Intake Bank 2 Signal
58 0.5 PK/BK 6262 Camshaft Position (CMP) Sensor - Exhaust Bank 2 Signal
59 0.5 D-BU/WH 6265 Camshaft Position (CMP) Sensor - Intake Bank 1 Signal
60 0.5 TN/WH 331 Oil Pressure Sensor Signal
61 - - Not Available
62 0.5 TN 472 IAT Sensor Signal
63 0.5 WH/BK 6271 CKP Sensor Signal
64 0.5 D-GN 485 TP Sensor 1 Signal
65 - - Not Used
66 0.5 PU 486 TP Sensor 2 Signal
67 0.5 YE 492 MAF Sensor Signal
68 0.5 GY/WH 3113 HO2S Heater Low Control (Bank 1 Sensor 1)
69 0.5 GY/WH 3122 HO2S Heater Low Control (Bank 2 Sensor 1)
70 0.5 YE/BK 846 Fuel Injector 6 Control
71 0.5 OG/BK 877 Fuel Injector 7 Control
72 0.5 TN 1744 Fuel Injector 1 Control
73 2 BK/WH 1551 Ground
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 34566-1323
  • Service Connector: 88988931
  • Description: 73-Way F MX123 34566 Series (BK)
Terminal Part Information
  • Pins: 1-9, 11-24, 27-40, 42-44, 46-60, 62-64, 66-72
  • Terminated Lead: 13575575
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 1-9, 13-24, 27-40, 42-44, 46-60, 62-64, 66-72 - J/J
  • Core/Insulation Crimp: Pins 11, 12 - K/K
  • Pins: 73
  • Terminated Lead: 13576392
  • 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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