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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 (LY7)
2008 Pontiac Grand Prix Base

Engine Control Module (ECM) X2 (LY7)

2008 Pontiac Grand Prix BaseSECTION Engine Control Module (ECM) X2 (LY7)
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 (LY7) Connector End View
GM1522872Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (LY7)

Pin Wire Circuit Function
1 0.5 PK 39 Ignition 1 Voltage
2 0.8 BK/WH 3122 HO2S Heater Low Control Sensor 2
3 0.5 PK 439 Ignition 1 Voltage
4 0.5 D-BU 473 High Speed Cooling Fan Relay Control
5 0.35 WH 121 Engine Speed Signal
6 - - Not Used
7 0.5 WH/BK 1164 5-Volt Reference 2
8 0.5 PU 1272 Low Reference
9 0.5 RD/BK 380 A/C Refrigerant Pressure Sensor Signal
10 0.5 WH 17 Stop Lamp Switch Signal
11 0.5 TN 472 IAT Sensor Signal
12 0.5 D-GN 890 Fuel Tank Pressure Sensor Signal
13-14 - - Not Used
15 0.35 OG/BK 463 Requested Torque Signal
16 - - Not Used
17 0.5 PK 39 Ignition 1 Voltage
18 - - Not Used
19 0.35 D-GN/WH 465 Fuel Pump Relay Control
20 0.5 D-GN 335 Low Speed Cooling Fan Relay Control
21 - - Not Used
22 0.5 D-GN 389 Vehicle Speed Signal
23 0.5 D-BU 6105 High Speed GMLAN Serial Data Bus +
24 0.5 BN 5069 Main Relay Control
25 0.5 BK 2759 Low Reference
26 0.5 BK 2760 Low Reference
27-28 - - Not Used
29 0.5 PU 3120 HO2S High Signal
30-31 - - Not Used
32 0.5 OG/BK 1786 Park/Neutral Signal
33 0.8 WH 1310 EVAP Canister Vent Solenoid Control
34 - - Not Used
35 0.5 YE/BK 625 Starter Enable Relay Control
36 0.5 OG 540 Battery Positive Voltage
37 0.35 TN/BK 464 Delivered Torque Signal
38 - - Not Used
39 0.5 GY 2709 5-Volt Reference 2
40 0.5 BN 1271 Low Reference
41 - - Not Used
42 0.5 PU 1589 Fuel Level Sensor Signal
43 0.5 YE 492 MAF Sensor Signal
44 0.5 L-BU 1162 APP Sensor 2 Signal
45-47 - - Not Used
48 0.5 D-GN 1049 ECM Class 2 Serial Data
49 0.5 D-GN/WH 459 A/C Compressor Clutch Relay Control
50 0.5 BN/WH 419 MIL Control
51-54 - - Not Used
55 0.5 L-BU 6106 High Speed GMLAN Serial Data Bus -
56 0.5 TN 1274 5-Volt Reference 1
57 0.5 TN/WH 3121 HO2S Low Signal
58 0.5 BN 1141 Ignition 3 Voltage
59 0.5 GY 1884 Cruise Control Set/Coast and Resume/Accelerate Switch Signal
60 0.5 D-BU 1161 APP Sensor 1 Signal
61-64 - - Not Used
Connector Part Information 
  • OEM: 1 928 403 514
  • Service: See Catalog
  • Description: 64-Way F (BK)
Terminal Part Information 
  • Pins: 1- 5, 7-12, 15, 17, 19, 20, 22-26, 29, 32, 33, 35- 37, 39, 40, 42-44, 48-50, 55-60
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit
RENDER: 1.0x

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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.