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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 131 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT VIEWS & COMPONENT CONNECTOR END VIEWS)COMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X2 (L61)
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Engine Control Module (ECM) X2 (L61)

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Engine Control Module (ECM) X2 (L61)
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) X2 (L61) Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (L61)

Pin Wire Circuit Function
1-3 - - Not Used
4 0.35 TN 2761 Low Reference
5 0.35 PU 574 Low Reference
6 0.35 TN 1744 Fuel Injector 1 Control
7 0.35 PK/BK 1746 Fuel Injector 3 Control
8 L-BU/BK 844 Fuel Injector 4 Control
9 0.35 BN 2129 Low Reference
10 L-GN/BK 1745 Fuel Injector 2 Control
11-12 - - Not Used
13 0.35 GY 2704 5-Volt Reference 1
14-15 - - Not Used
16 0.35 YE 581 TAC Motor Control - 1
17-19 - - Not Used
20 0.35 TN 5301 Low Reference
21 - - Not Used
22 0.35 PU 2121 IC 1 Control
23 L-BU 2123 IC 3 Control
24 D-GN/WH 2124 IC 4 Control
25 - - Not Used
26 0.35 OG/WH 2122 IC 2 Control
27-29 - - Not Used
30 D-GN/WH 428 EVAP Canister Purge Solenoid Control
31 0.35 OG 225 Generator Turn On Signal
32 0.35 BN 582 TAC Motor Control - 2
33 D-BU 5300 5-Volt Reference 1
34-36 - - Not Used
37 0.5 PU/WH 3110 HO2S High Signal (Sensor 1)
38 0.5 PU 3120 HO2S High Signal (Sensor 2)
39 L-GN 432 MAP Sensor Signal
40 0.35 TN 2752 Low Reference
41 - - Not Used
42 0.35 TN/BK 2760 Low Reference
43 0.35 GY 23 Generator Field Duty Cycle Signal
44 - - Not Used
45 0.35 YE 573 CKP Sensor Signal
46 0.35 OG 5275 CMP Sensor Signal
47 - - Not Used
48 0.5 TN/WH 3111 HO2S Low Signal (Sensor 1)
49 0.35 OG/BK 469 Low Reference
50 0.35 GY 1716 KS Signal
51 D-BU 496 KS Signal
52 - - Not Used
53 0.35 GY 2701 5-Volt Reference 2
54 0.35 L-GN 2867 5-Volt Reference 2
55-56 - - Not Used
57 0.35 D-GN 485 TP Sensor 1 Signal
58 0.35 YE 410 ECT Sensor Signal
59 0.35 PU 486 TP Sensor 2 Signal
60-64 - - Not Used
65 0.5 GY/WH 3113 HO2S Heater Low Control (Sensor 1)
66 0.5 GY/WH 3122 HO2S Heater Low Control (Sensor 2)
67 0.35 TN/BK 231 Oil Pressure Switch Signal
68 0.5 TN/WH 3121 HO2S Low Signal (Sensor 2)
69-72 - - Not Used
73 2 BK/WH 451 Ground
Connector Part Information 
  • OEM: 13589571
  • Service: See Catalog
  • Description: 73-Way F Receptacle 0.64 2.8 Sealed (GY)
Terminal Part Information 
  • 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.