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Engine Control Module (ECM) X2 (LY7)

Fig 1: Engine Control Module (ECM) X2 (LY7)
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (LY7)

Pin Wire Circuit Function
1 0.5 PU 2121 IC 1 Control
2 0.5 TN/WH 3111 HO2S Low Reference Bank 1 Sensor 1
3 0.5 PU/WH 3110 HO2S Reference Voltage 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 Low Reference
8 0.5 D-BU 496 Knock Sensor 1 Signal
9 0.5 GY 1716 Low Reference
10 - - Not Used
11 0.75 YE 581 TAC Motor Control - 1
12 0.75 BN 582 TAC Motor Control - 2
13 0.8 PK/BK 6341 Powertrain Relay Contact Signal
14 0.5 PK/BK 6395 Camshaft Position (CMP) Actuator Solenoid Control - Bank 1 Intake
15 0.5 TN/BK 6397 Camshaft Position (CMP) Actuator Solenoid Control - Bank 2 Intake
16 - - Not Used
17 0.5 OG/WH 2122 IC 2 Control
18 - - Not Used
19 0.5 BN/WH 2130 Low Reference
20 0.5 PU 6267 Camshaft Position (CMP) Sensor Low Reference - Bank 1 Exhaust
21 0.5 TN 6268 Camshaft Position (CMP) Sensor Low Reference - Bank 2 Intake
22 0.5 WH 6269 Low Reference
23 0.5 BN 6266 Camshaft Position (CMP) Sensor Low Reference - Bank 1 Intake
24 0.5 BK 2755 Low Reference
25-26 - - Not Used
27 0.5 GY/BK 6272 Crankshaft Position Sensor Low Reference
28 - - Not Used
29 0.5 TN 2752 Low Reference
30 0.5 BN/WH 6754 Camshaft Position (CMP) Actuator Solenoid Control - Bank 1 Exhaust
31 0.5 D-BU/WH 6756 Camshaft Position (CMP) Actuator Solenoid Low Reference - Bank 2 Exhaust
32 0.5 L-BU/BK 844 Fuel Injector 4 Control
33 0.5 L-BU 2123 IC 3 Control
34 0.5 L-BU/WH 2126 IC 6 Control
35 0.5 BN 2129 Low Reference
36 0.5 D-GN 6457 Camshaft Position (CMP) Sensor 5-Volt Reference - Bank 1 Exhaust
37 0.5 OG 6260 Camshaft Position (CMP) Sensor 5-Volt Reference - Bank 2 Intake
38 0.5 PK 6261 Camshaft Position (CMP) Sensor 5-Volt Reference - Bank 2 Exhaust
39 0.5 D-BU 6259 Camshaft Position (CMP) Sensor 5-Volt Reference - Bank 1 Intake
40-41 - - Not Used
42 0.5 TN 2760 Low Reference
43 0.5 PU/WH 6270 Crankshaft Position Sensor 5-Volt Reference
44 0.5 GY 2701 5-Volt Reference
45 - - Not Used
46 0.5 BN 6753 Camshaft Position (CMP) Actuator Solenoid Low Reference - Bank 1 Intake
47 0.5 D-BU 6755 Camshaft Position (CMP) Actuator Solenoid Low Reference - Bank 2 Intake
48 0.5 L-GN/BK 1745 Fuel Injector 2 Control
49 0.5 YE/BK 846 Fuel Injector 6 Control
50 0.5 WH/BK 6396 Camshaft Position (CMP) Actuator Solenoid Control - Bank 1 Exhaust
51 0.5 GY/BK 6394 Camshaft Position (CMP) Actuator Solenoid Control - Bank 2 Exhaust
52 0.5 TN/WH 845 Fuel Injector 5 Control
53 0.5 D-GN/WH 2124 IC 4 Control
54 0.5 D-GN 2125 IC 5 Control
55 - - Not Used
56 0.5 D-GN/WH 6264 Camshaft Position (CMP) Sensor Signal - Bank 1 Exhaust
57 0.5 OG/BK 6263 Camshaft Position (CMP) Sensor Signal - Bank 2 Intake
58 0.5 PK/BK 6262 Camshaft Position (CMP) Sensor Signal - Bank 2 Exhaust
59 0.5 D-BU/WH 6265 Camshaft Position (CMP) Sensor Signal - Bank 1 Intake
60-61 - - Not Used
62 0.5 L-BU 6289 Induction Air Temperature Sensor Signal
63 0.5 WH/BK 6271 Crankshaft Position 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 1 Sensor 2
70 - - Not Used
71 0.5 PK/BK 1746 Fuel Injector 3 Control
72 0.5 TN 1744 Fuel Injector 1 Control
73 3 BK/WH 251 Ground
Connector Part Information 
  • OEM: 15499466
  • Service: 88988931
  • Description: 73-Way F MX123 Series, Sealed (BK)
Terminal Part Information 
  • Pins: 1-9, 11-12, 14-15, 17, 19-24, 27, 29, 30-39, 42-44, 46-54, 56, 57-59, 62-64, 66-69, 71-72
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 1-9, 14-15, 17, 19-24, 27, 29-39, 42-44, 46-54, 56-59, 62-64, 66-69, 71-72 - J/J
  • Core/Insulation Crimp: Pins 11-12 - See Terminal Repair Kit
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 13
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 73
  • Terminal/Tray: 1326030-8/17
  • Core/Insulation Crimp: 4/D
  • Release Tool/Test Probe: 12094429/J-35616-4A (PU)
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