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Engine Control Module (ECM) X1 (LZ4)

Fig 1: Engine Control Module (ECM) X1 (LZ4)
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1 (LZ4)

Pin Wire Circuit Function
1 0.5 OG/BK 1786 Ignition Lock Cylinder Control Actuator Signal
2-8 - - Not Used
9 0.5 WH 17 Stop Lamp Switch Signal or Stop Lamp Supply Voltage
10 0.5 PU 3120 HO2S High Signal Bank 1 Sensor 2
11 0.5 TN/WH 3121 HO2S Low Signal Bank 1 Sensor 2
12 0.5 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
13 0.5 TN 5514 Low Reference
14-15 - - Not Used
16 0.5 D-BU 1936 Fuel Level Sensor Signal - Secondary
17 0.5 D-BU 473 High Speed Cooling Fan Relay Control
18 0.5 D-BU 5985 Accessory Wakeup Serial Data
19 0.5 PK 639 Ignition 1 Voltage
20 0.5 RD/WH 40 Battery Positive Voltage
21-22 - - Not Used
23 0.5 PU 1272 Low Reference
24 0.5 D-GN 890 Fuel Tank Pressure Sensor Signal
25-26 - - Not Used
27 0.5 TN 2501 High Speed GMLAN Serial Data Bus-
28 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus+
29 0.5 D-BU 1161 APP Sensor 1 Signal
30 0.5 BN 1271 Low Reference
31 0.5 BN/WH 6281 Low Reference
32 0.5 L-BU 1162 APP Sensor 2 Signal
33 0.5 BN/WH 6283 Fuel Tank Vapor Pressure Sensor Supply Voltage
34 0.5 GY 2700 5-Volt Reference
35 - - Not Used
36 0.5 TN 1274 5-Volt Reference
37 0.5 L-BU 6289 Induction Air Temperature Sensor Signal
38 0.5 TN 2760 Low Reference
39-40 - - Not Used
41 0.5 YE 492 MAF Sensor Signal
42-46 - - Not Used
47 0.8 PK/BK 6341 Ignition 1 Voltage
48 - - Not Used
49 0.5 TN 3221 HO2S Low Signal Bank 2 Sensor 2
50 0.5 D-GN/WH 465 Fuel Pump Relay Control - Primary
51 - - Not Used
52 0.5 PU/WH 6386 Starter Enable Relay Control
53-55 - - Not Used
56 0.5 WH/BK 1164 5-Volt Reference
57 - - Not Used
58 0.5 D-GN 335 Low Speed Cooling Fan Relay Control
59 0.5 YE 5991 Powertrain Relay Coil Control
60 - - Not Used
61 0.5 WH 1310 EVAP Canister Vent Solenoid Control
62 - - Not Used
63 0.5 D-GN/WH 459 A/C Compressor Clutch Relay Control
64 0.5 OG/WH 3223 HO2S Heater Low Control Bank 2 Sensor 2
65 0.5 GY/WH 3122 HO2S Heater Low Control - Bank 2 Sensor 1
66-67 - - Not Used
68 0.5 BN/WH 419 MIL Control
69 0.5 PU 3220 HO2S High Signal Bank 2 Sensor 2
70 0.5 L-BU 1937 Secondary Fuel Level Sensor Signal
71-72 - - Not Used
73 3 BK/WH 251 Ground
Connector Part Information 
  • OEM: 15499466
  • Service: 88988931
  • Description: 73-Way F MX123 Series, Sealed (BK)
Terminal Part Information 
  • Pins: 1, 9-13, 16-20, 23-24, 27-34, 36-38, 41, 47, 49-50, 52, 56, 58-59, 61, 63-65, 68-70
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 1, 9-13, 16-20, 23- 24, 27-34, 36-38, 41, 49-50, 52, 56, 58-59, 61, 63-65, 68-70 - J/J
  • Core/Insulation Crimp: Pins 47 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 73
  • Terminal/Tray: 1326030-8/17
  • Core/Insulation Crimp: 4/D
  • Release Tool/Test Probe: 12094429/J-35616-4A (PU)
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