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Engine Control Module (ECM) X1 (Gas, Gas/Ethanol)

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) X1 (Gas) Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1 (Gas)

Pin Wire Circuit Function
1 0.35 D-BU 1161 APP Sensor 1 Signal (4.3L)
0.35 OG/BK 1786 Park/Neutral Signal (4.8L/5.3L/6.0L/6.2L)
2 0.5 PU 1670 HO2S High Signal Bank 2 Sensor 2 (4.3L)
0.5 GY/BK 1694 4WD Low Signal (4.8L/5.3L/6.0L/6.2L+NQG/NP2)
3 0.5 D-BU 5985 Accessory Wakeup Serial Data (4.3L)
0.5 TN/WH 1695 Axle Switch Signal (4.8L/5.3L/6.0L/6.2L +NQG/NP2)
4 - - Not Used
5 0.35 D-GN 335 Low Speed Cooling Fan Relay Control (4.3L)
6 0.35 D-GN/WH 465 Fuel Pump Relay Control - Primary (4.3L)
7 - - Not Used
8 0.35 TN 514 Low Reference (4.3L +CJ2/C67)
9 0.5 TN/WH 1669 HO2S Low Signal Bank 1 Sensor 2 (4.3L)
0.5 L-BU/WH 6311 Brake Switch Signal (4.8L/5.3L/6.0L/6.2L)
10 0.5 TN 1671 H02S Low Signal Bank 2 Sensor 2 (4.3L)
0.5 PU/WH 1668 HO2S High Signal Bank 1 Sensor 2 (4.8L/5.3L6.0L/6.2L)
11 0.5 TN/WH 1669 HO2S Low Signal Bank 1 Sensor 2 (4.8L/5.3L6.0L/6.2L)
12 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal (4.8L/5.3L6.0L/6.2L +CJ2/C67)
13 0.35 YE 5991 Powertrain Relay Coil Control (4.3L)
0.35 TN 5514 Low Reference (4.8L/5.3L6.0L/6.2L +CJ2/C67)
14 - - Not Used
15 0.5 GY/WH 3122 HO2S Heater Low Control Bank 1 Sensor 2 (4.3L)
16 0.5 OG/WH 3223 HO2S Heater Low Control bank 1 Sensor 2 (4.3L)
0.35 PU 1589 Fuel Level Sensor Signal - Primary (4.8L/5.3L/6.0L/6.2L)
17 0.5 PU/WH 1668 Ho2S High Signal Bank 1 Sensor 2 (4.3L)
0.35 D-BU/WH 473 High Speed Cooling Fan Relay Control (4.8L/5.3L/6.0L/6.2L -LY6)
18 0.35 L-BU 1162 APP Sensor 2 Signal (4.3L)
0.5 D-BU 5985 Accessory Wakeup Serial Data (4.8L/5.3L/6.0L/6.2L)
19 0.5 PK 439 Ignition 1 Voltage
20 0.5 RD/WH 440 Battery Positive Voltage
21 0.35 PU 1272 Low Reference (4.3L)
22 - - Not Used
23 0.35 PU 1272 Low Reference (4.8L/5.3L/6.0L/6.2L)
24 0.35 TN/BK 6049 Low Reference (4.3L)
0.35 D-GN 890 Fuel Tank Pressure Sensor Signal (4.8L/5.3L/6.0L/6.2L)
25 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal (4.3L + CJ2/C67)
26 0.5 GY/BK 1694 4WD Low Signal (4.3L +NQG/NP2
27 0.35 BN/WH 419 MIL Control (4.3L)
0.5 TN/BK 2501 High Speed GMLAN Serial Data Bus- (4.8L/5.3L/6.0L/6.2L)
28 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus+ (4.8L/5.3L/6.0L/6.2L)
29 0.35 D-BU 1161 APP Sensor 1 Signal (4.8L/5.3L/6.0L/6.2L)
30 0.35 D-GN/WH 459 A/C Compressor Clutch Relay Control (4.3L +C67/Cj2)
0.35 BN 1271 Low Reference (4.8L/5.3L/6.0L/6.2L)
31 0.35 TN/BK 6049 Low Reference (4.8L/5.3L/6.0L/6.2L)
32 0.35 YE/BK 625 Starter Relay Coil Control (4.3L)
0.35 L-BU 1162 APP Sensor 2 Signal (4.8L/5.3L/6.0L/6.2L)
33 0.35 GY 2709 5-Volt Reference 1 (4.8L/5.3L/6.0L/6.2L)
34 0.35 GY/WH 2700 5-Volt Reference 1 (4.8L/5.3L/6.0L/6.2L)
35 0.5 TN 2760 Low Reference (4.8L/5.3L/6.0L/6.2L)
36 0.35 TN 1274 5-Volt Reference 1 (4.8L/5.3L/6.0L/6.2L)
37 0.5 YE 492 MAF Sensor Signal (4.3L)
0.5 TN/BK 472 IAT Sensor Signal (4.8L/5.3L/6.0L/6.2L)
38 0.5 TN 2760 Low Reference (4.8L/5.3L/6.0L/6.2L)
39 0.35 PU 1589 Fuel Level Sensor Signal - Primary (4.3L)
40 - - Not Used
41 0.35 BN 1271 Low Reference (4.3L)
0.5 YE 492 MAF Sensor Signal (4.8L/5.3L/6.0L/6.2L)
42 0.35 D-GN 890 Fuel Tank Pressure Sensor Signal (4.3L)
43 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus+ (4.3L)
44 0.5 TN 2501 High Speed GMLAN Serial Data Bus- (4.3L)
45-46 - - Not Used
47 0.35 WH/BK 1164 5-Volt Reference 2
0.5 PK/BK 1339 Ignition 1 Voltage (4.8L/5.3L/6.0L/6.2L)
48 - - Not Used
49 0.35 D-BU 473 High Speed Cooling Fan Relay Control (4.3L)
0.5 TN 1671 JO2S Low Signal Bank 2 Sensor 2 (4.8L/5.3L/6.0L/6.2L)
50 0.35 YE/BK 1827 Vehicle Speed Signal (4.3L)
0.35 D-GN/WH 465 Fuel Pump Relay Control - Primary (LMG/LY6/LC9)
0.35 D-GN/WH 465 Fuel System Control Module Signal Fuel Pump Relay Control - Primary (4.3L/5.3L/6.0L/6.2L -LMG/LY6/LC9)
51 0.35 TN 1465 Fuel Pump Relay Control - Secondary (LY6)
52 0.5 YE/BK 625 Starter Enable Relay Control (4.8L/5.3L/6.0L/6.2L)
53 - - Not Used
54 0.35 OG/BK 6399 Replicated TOS Signal (4.3L)
55 0.5 L-BU/WH 6311 TCC Brake Signal (4.3L)
56 0.35 WH/BK 1164 5-Volt Reference 2
57 0.35 OG/BK 1786 Park/Neutral Signal (4.3L)
0.35 YE/BK 1827 Vehicle Speed Signal (4.8L/5.3L/6.0L/6.2L)
58 0.5 TN 472 IAT Sensor Signal (4.3L)
0.35 D-GN 335 Low Speed Cooling Fan Relay Control (4.8L/5.3L/6.0L/6.2L -LY6)
59 0.35 YE 5991 Powertrain Relay Coil Control (4.8L/5.3L/6.0L/6.2L)
60 - - Not Used
61 0.5 WH 1310 EVAP Canister Venst Solenoid Control (4.8L/5.3L/6.0L/6.2L)
62 - - Not Used
63 0.35 D-GN/WH 459 A/C Compressor Clutch Relay Control (4.8L/5.3L/6.0L/6.2L +CJ2/C67)
64 0.5 OG/WH 3223 HO2S Heater Low Control Bank 2 Sensor 2 (4.8L/5.3L/6.0L/6.2L)
65 0.35 GY 2700 5-Volt Reference 1 (4.3L)
0.5 GY/WH 3122 HO2S Heater Low Control Bank 2 Sensor 1 (4.8L/5.3L/6.0L/6.2L)
66 0.35 GY 2709 5-Volt Reference 1 (4.3L)
67 0.35 TN 1274 5-Volt Reference 1 (4.3L)
68 0.35 BN/WH 419 MIL Control (4.8L/5.3L/6.0L/6.2L)
69 0.5 PU 1970 HO2S High Signal Bank 2 Sensor 2 (4.8L/5.3L/6.0L/6.2L)
70 0.5 WH 1310 EVAP Canister Vent Solenoid Control (4.3L)
0.35 L-BU 1937 Secondary Fuel Level Sensor Signal (LY6)
71 0.35 OG/BK 6399 Replicated TOS Signal (4.8L/5.3L/6.0L/6.2L -31 Series -NQF/NQG/NP2)
0.5 PU/WH 821 VSS High Signal (6.0L +20/30 Series +NQF/NQG/NP2)
72 0.5 TN/WH 1695 Axle Switch Signal (4.3L +NQG/NP2)
0.5 L-GN/BK 822 VSS Low Signal (6.0L +20/30 Series +NQF/NQG/NP2)
73 0.5 PK 1339 Ignition 1 Voltage (4.3L)
3 BK/WH 451 Ground (4.8L/5.3L/6.0L/6.2L)
Connector Part Information 
  • OEM: 15499466
  • Service: 88988931
  • Description: 73-Way F Receptacle 0.64 2.8 Series Sealed (BK)

Terminal Part Information 
  • Pins: 1, 13, 24, 30, 32, 50, 57
  • Pins: 5-6, 8, 18, 21, 25, 27, 39, 41-42, 47, 49, 54, 65-67 (4.3L)
  • Pins: 12, 16, 23, 29, 31, 33-34, 36, 51, 56, 59, 63, 68, 70-71 (4.8L/5.3 L/6.0L/6.2L)
  • 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, 19-20, 37, 70, 72
  • Pins: 15-17, 26, 35, 43-44, 55, 58 (4.3L)
  • Pins: 11, 18, 27-28, 38, 41, 47, 49, 52, 61, 64-65, 69, 71 (4.8L/5.3 L/6.0L/6.2L)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 73 (4.3L)
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit
  • Pins: 73 (4.8L/5.3 L/6.0L/6.2L)
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: A/5
  • Release Tool/Test Probe: 12094430/J-35616-35 (VT)
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