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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1027 (ENGINE CONTROLS AND FUEL - 4.3L - INTRODUCTION (2 OF 2))COMPONENT LOCATORENGINE CONTROL MODULE CONNECTORSENGINE CONTROL MODULE X1
2006 Chevrolet Suburban C2500, 6.0 U

Engine Control Module X1

2006 Chevrolet Suburban C2500, 6.0 USECTION Engine Control Module X1
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module X1 Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module X1 Connector Parts Information

Connector Part Information 
  • OEM: 15499466
  • Service: 88988931
  • Description: 73-Way F Receptacle 0.64 2.8 Sealed (BK)
Terminal Part Information 
  • Pins: 73
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit
  • Pins: 1, 5-6, 8, 13, 18, 21, 24-25, 27, 30, 32, 39, 41-42, 47, 49-50, 54, 57, 65-67
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 2-3, 9-10, 15-17, 19-20, 26, 35, 37, 43-44, 55, 58, 70, 72
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module X1 Connector Terminal Identification

Pin Wire Color Circuit No. Function
1 0.35 D-BU 1161 APP Sensor 1 Signal
2 0.5 PU 1670 HO2S High Signal Bank 2 Sensor 2
3 0.5 D-BU 5985 Accessory Wakeup Serial Data
4 - - Not Used
5 0.35 D-GN 335 Low Speed Cooling Fan Relay Control
6 0.35 D-GN/WH 465 Fuel Pump Relay Control-Primary
7 - - Not Used
8 0.35 TN 5514 Low Reference (CJ2/C67)
9 0.5 TN/WH 1669 HO2S Low Signal Bank 1 Sensor 2
10 0.5 TN 1671 HO2S Low Signal Bank 2 Sensor 2
11-12 - - Not Used
13 0.35 YE 5991 Powertrain Relay Coil Control
14 - - Not Used
15 0.5 GY/WH 3122 HO2S Heater Low Control Bank 1 Sensor 2
16 0.5 OG/WH 3223 HO2S Heater Low Control Bank 2 Sensor 2
17 0.5 PU/WH 1668 HO2S High Signal Bank 1 Sensor 2
18 0.35 L-BU 1162 APP Sensor 2 Signal
19 0.5 PK 439 Ignition 1 Voltage
20 0.5 RD/WH 440 Battery Positive Voltage
21 0.35 PU 1272 Low Reference
22-23 - - Not Used
24 0.35 TN/BK 6049 Low Reference
25 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal (CJ2/C67)
26 0.5 GY/BK 1694 4WD Low Signal (NQG/NP2)
27 0.35 BN/WH 419 MIL Control
28-29 - - Not Used
30 0.35 D-GN/WH 459 A/C Compressor Clutch Relay Control (CJ2/C67)
31 - - Not Used
32 0.35 YE/BK 625 Starter Relay Coil Control
33-34 - - Not Used
35 0.5 TN 2760 Low Reference
36 - - Not Used
37 0.5 YE 492 MAF Sensor Signal
38 - - Not Used
39 0.35 PU 1589 Fuel Level Sensor Signal - Primary
40 - - Not Used
41 0.35 BN 1271 Low Reference
42 0.35 D-GN 890 Fuel Tank Pressure Sensor Signal
43 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus+
44 0.5 TN 2501 High Speed GMLAN Serial Data Bus-
45-46 - - Not Used
47 0.35 WH/BK 1164 5-Volt Reference 2
48 - - Not Used
49 0.35 D-BU 473 High Speed Cooling Fan Relay Control
50 0.35 YE/BK 1827 Vehicle Speed Signal
51-53 - - Not Used
54 0.35 OG/BK 6399 Replicated TOS Signal
55 0.5 L-BU/WH 6311 TCC Brake Signal
56 - - Not Used
57 0.35 OG/BK 1786 Park/Neutral Signal
58 0.5 TN 472 IAT Sensor Signal
59-64 - - Not Used
65 0.35 GY 2700 5-Volt Reference 1
66 0.35 GY 2709 5-Volt Reference 1
67 0.35 TN 1274 5-Volt Reference 1
68-69 - - Not Used
70 0.5 WH 1310 EVAP Canister Vent Solenoid Control
71 - - Not Used
72 0.5 TN/WH 1695 Axle Switch Signal (NQG/NP2)
73 0.5 PK 1339 Ignition 1 Voltage
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.