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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2354 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - D THROUGH E)COMPONENT CONNECTOR END VIEWS - D THROUGH EENGINE CONTROL MODULE (ECM) X1 (LLT)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Engine Control Module (ECM) X1 (LLT)

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Engine Control Module (ECM) X1 (LLT)
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) X1 (LLT)
GM1826274Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1 (LLT)

Pin Wire Circuit Function
1 0.75 GN 5282 Camshaft Phaser Exhaust Solenoid
2 0.75 PU 5284 Camshaft Position (CMP) Actuator Solenoid - Intake Bank 1
3 1 PU/WH 4906 Fuel Injector 6 Control
4 1 PU 4806 Low Reference
5 1 YE 7301 High Pressure Fuel Pump Actuator Solenoid Control
6 0.75 D-GN/WH 428 EVAP Canister Purge Solenoid Control
7 0.5 OG 5275 Camshaft Position (CMP) Sensor - Intake Bank 1 Signal
8 - - Not Used
9 0.5 PU 5274 Camshaft Position Exhaust Sensor
10 0.5 OG 225 Generator Turn On Signal
11-12 - - Not Used
13 0.5 BN/WH 2130 Low Reference
14 0.35 GY 5127 Afterboil Coolant Pump Supply Voltage
15 0.5 GY 705 5-Volt Reference 2
16-17 - - Not Used
18 0.35 BN 7448 Vacuum Pump Relay Control
19-23 - - Not Used
24 0.75 YE 581 TAC Motor Control - 1
25 0.75 WH/BK 5283 Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 2
26 1 D-GN 4803 Low Reference
27 1 D-GN/WH 4903 Fuel Injector 3 Control
28 1 L-GN 4805 Low Reference
29 1 L-GN/WH 4905 Fuel Injector 5 Control
30 0.5 GY 23 Generator Field Duty Cycle Signal
31-32 - - Not Used
33 0.5 YE 5276 Camshaft Position (CMP) Sensor - Intake Bank 2 Signal
34 0.5 D-GN 5273 Camshaft Position Exhaust Sensor
35 0.5 YE 573 CKP Sensor Signal
36 0.5 YE 2918 Fuel Rail Pressure Sensor Signal
37 - - Not Used
38 0.5 GY 2700 5-Volt Reference 3
39 0.5 GY 2701 5-Volt Reference 3
40 0.5 GY 596 5-Volt Reference 1
41 0.5 TN 552 Low Reference
42 0.5 TN 808 Low Reference
43 0.5 TN 470 Low Reference
44 0.5 TN 476 Low Reference
45 0.5 GY 605 5-Volt Reference 3
46 0.5 TN 452 Low Reference
47 - - Not Used
48 0.75 BN 582 TAC Motor Control - 2
49 0.75 OG/BK 5272 Camshaft Position (CMP) Sensor - Intake Bank 1 Signal
50 1 L-BU 4804 Low Reference
51 1 BN 4801 Low Reference
52 1 D-BU 4802 Low Reference
53 1 D-BU/WH 4902 Fuel Injector 2 Control
54 0.35 BN 818 Vehicle Speed Signal
55 0.5 PU 2121 IC 1 Control
56 0.5 L-BU 2123 IC 3 Control
57 0.5 D-GN 2125 IC 5 Control
58 - - Not Used
59 0.5 D-BU 496 Knock Sensor (1) Signal
60 0.5 GY 2303 Low Reference
61 0.5 TN/WH 331 Oil Pressure Sensor Signal
62-66 - - Not Used
67 0.5 TN/WH 3111 HO2S Low Reference (Bank 1 Sensor 1)
68-69 - - Not Used
70 0.5 PU/WH 3210 HO2S Reference Voltage (Bank 2 Sensor 1)
71 - - Not Used
72 0.75 GN 3212 HO2S Heater Low Control (Bank 2 Sensor 1)
73 1 PU 7300 Low Reference
74 1 L-BU/WH 4904 Fuel Injector 4 Control
75 1 BN/WH 4901 Fuel Injector 1 Control
76 0.8 PK/BK 5291 Ignition 1 Voltage
77 0.8 PK/BK 5292 Ignition 1 Voltage
78 0.5 BN 2129 Low Reference
79 0.5 OG/WH 2122 IC 2 Control
80 0.5 D-GN/WH 2124 IC 4 Control
81 0.5 L-BU/WH 2126 IC 6 Control
82 0.5 YE 410 ECT Sensor Signal
83 0.5 GY 1716 Knock Sensor 1 Signal
84 0.5 L-BU 1876 Knock Sensor 2 Signal
85-87 - - Not Used
88 0.5 TN 2752 Low Reference
89 0.5 PU 486 TP Sensor 2 Signal
90 0.5 D-GN/WH 485 TP Sensor 1 Signal
91 - - Not Used
92 0.5 PU/WH 3110 HO2S High Signal (Bank 1 Sensor 1)
93 0.5 TN/WH 3211 HO2S Low Signal (Bank 2 Sensor 1)
94-95 - - Not Used
96 0.75 GY/WH 3113 HO2S Heater Low Control (Bank 1 Sensor 1)
Connector Part Information 
  • Harness: Engine
  • OEM: 1928404781
  • Service: 19149311
  • Description: 96-Way F 120 MAT Series, 280 BDK Series, Sealed (BK)
Terminal Part Information 
  • Terminal/Tray: 1928498135/19
  • Core/Insulation Crimp: Pins 14, 18, 54 - P/P
  • Core/Insulation Crimp: Pins 1, 2, 6, 7, 9, 10, 13, 15, 24, 25, 30, 33, 34, 35, 36, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 49, 55, 56, 57, 59, 60, 61, 67, 70, 72, 76, 77, 78, 79, 80, 81, 82, 83, 84, 88, 89, 90, 92, 93, 96 - J/J
  • Core/Insulation Crimp: Pins 3, 4, 5, 26, 27, 28, 29, 50, 51, 52, 53, 73, 74, 75 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-16 (L-GN)
RENDER: 1.0x

NO RELATED

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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.