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Engine Control Module (ECM) X1 (LS9)

GM1590948Courtesy of
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 34576-5803
  • Service Connector: 88988373
  • Description: 56-Way F MX123 34567 Series, Sealed (BU)
Terminal Part Information
  • Pins: 7-18, 25-45, 47-55
  • Terminated Lead: 13575811
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Pins: 19, 20, 46
  • Terminated Lead: 13575812
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
Engine Control Module (ECM) X1 (LS9)

Pin Wire Circuit Function
1-6 - - Not Used
7 0.35 WH 17 Low Reference
8 - - Not Used
9 0.35 TN 2759 Low Reference
10-11 - - Not Used
12 0.35 BN/WH 419 Malfunction Indicator Lamp (MIL) Control
13 0.35 D-GN/WH 465 Fuel System Control Module Signal Fuel Pump Relay Control - Primary
14-17 - - Not Used
18 0.35 YE 43 Ignition Voltage
19 0.5 PK 1439 Ignition Voltage
20 0.5 RD/WH 2440 Battery Positive Voltage
21-24 - - Not Used
25 0.35 WH 121 Engine Speed Signal
26 0.35 PU/WH 6386 Starter Enable Relay Control
27-32 - - Not Used
33 0.35 WH/BK 1164 5-Volt Reference
34 0.35 GY 2709 Fuel Tank Pressure Sensor 5-Volt Reference
35 0.35 TN 1274 5-Volt Reference
36 0.35 BN 1271 Low Reference
37 0.35 PU 1272 Low Reference
38 - - Not Used
39 0.35 D-GN/WH 817 Vehicle Speed Signal (VSS)
40 0.35 WH/BK 448 Ignition Relay Control
41-43 - - Not Used
44 0.35 D-BU 1936 Fuel Level Sensor Signal - Primary
45 0.35 L-BU 1937 Fuel Level Sensor - Secondary
46 0.5 BN 7123 Super Charger Inlet Air Pressure Sensor Signal
47 0.35 D-BU 1161 Accelerator Pedal Position (APP) Sensor 1 Signal
48 0.35 D-GN 890 Fuel Tank Pressure Sensor Signal
49 0.35 L-BU 1162 Accelerator Pedal Position (APP) Sensor 2 Signal
50-52 - - Not Used
53 0.35 D-GN/WH 450 Ground
54 - - Not Used
55 0.35 WH 1310 EVAP Canister Vent Solenoid Valve Control
56 - - Not Used
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