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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 417 (COMPONENT LOCATIONS & COMPONENT CONNECTOR END VIEWS)COMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X2 (LS4)
2008 Pontiac Grand Prix Base

Engine Control Module (ECM) X2 (LS4)

2008 Pontiac Grand Prix BaseSECTION Engine Control Module (ECM) X2 (LS4)
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) X2 (LS4) Connector End View
GM1673472Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (LS4)

Pin Wire Circuit Function
1 0.5 PU 2121 IC 1 Control
2 0.5 TN 1664 HO2S Low Signal
3 0.5 PU/WH 1665 HO2S High Signal
4 0.5 PU/WH 1668 HO2S High Signal
5 0.5 TN/WH 1669 HO2S Low Signal
6 0.35 L-BU 1876 Knock Sensor 2 Signal
7 0.35 GY 2303 Knock Sensor 2 Signal
8 0.35 D-BU 496 Knock Sensor 1 Signal
9 0.35 GY 1716 Knock Sensor 1 Signal
10 - - Not Used
11 0.5 YE 581 TAC Motor Control 1
12 0.5 BN 582 TAC Motor Control 2
13 0.5 PK/BK 5290 Ignition 1 Voltage
14-15 - - Not Used
16 0.5 PK/BK 1746 Fuel Injector 3 Control
17 0.5 PU/WH 2128 IC 8 Control
18 0.5 D-GN/WH 2124 IC 4 Control
19 0.5 BN/WH 2130 Low Reference
20-22 - - Not Used
23 0.35 PK/BK 632 Low Reference
24 0.35 BK 2755 Low Reference
25-26 - - Not Used
27 0.35 YE/BK 1868 Low Reference
28 - - Not Used
29 0.35 BK/WH 1704 Low Reference
30-31 - - Not Used
32 0.5 L-GN/BK 1745 Fuel Injector 2 Control
33 0.5 RD 2127 IC 7 Control
34 0.5 D-GN 2125 IC 5 Control
35 0.5 BN 2129 Low Reference
36-38 - - Not Used
39 0.35 RD 631 5-Volt Reference 1
40 0.35 GY 2705 5-Volt Reference 1
41 - - Not Used
42 0.35 BK 2760 Low Reference
43 0.35 L-GN 1867 5-Volt Reference 2
44 0.35 L-BU/BK 1688 5-Volt Reference 2
45-47 - - Not Used
48 0.5 D-BU/WH 878 Fuel Injector 8 Control
49 0.5 BK/WH 845 Fuel Injector 5 Control
50-51 - - Not Used
52 0.5 YE/BK 846 Fuel Injector 6 Control
53 0.5 RD/WH 2122 IC 2 Control
54 0.5 L-BU/WH 2126 IC 6 Control
55 0.5 L-BU 2123 IC 3 Control
56-58 - - Not Used
59 0.35 BN/WH 633 CMP Sensor Signal
60 0.35 TN/WH 331 Oil Pressure Switch Signal
61 - - Not Used
62 0.35 TN 472 IAT Sensor Signal
63 0.35 D-BU/WH 1869 CKP Sensor Signal
64 0.35 D-GN 485 TP Sensor 1 Signal
65 - - Not Used
66 0.35 PU 486 TP Sensor 2 Signal
67 0.35 YE 492 MAF Sensor Signal
68 0.5 BK/WH 3113 HO2S Heater Low Control Sensor
69 0.5 BN 2391 HO2S Heater Low Control - Sensor 2
70 0.5 L-BU/BK 844 Fuel Injector 4 Control
71 0.5 RD/BK 877 Fuel Injector 7 Control
72 0.5 BK 1744 Fuel Injector 1 Control
73 2 BK/WH 451 Ground
Connector Part Information 
  • OEM: 13574286
  • Service: See Catalog
  • Description: 73-Way F MX123 34566 Series (BK)
Terminal Part Information 
  • Pins: 1-9, 11-13, 16-19, 23, 24, 27, 29, 32-35, 39, 40, 42-44, 48, 49, 52-55, 59, 60, 62-64, 66-73
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.