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Engine Control Module (ECM) X1 Connector End View

Fig 1: Engine Control Module (ECM) X1 Connector End View
GM1673472Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1

Pin Wire Circuit Function
1 0.35 D-BU 1161 APP Sensor 1 Signal
2 - - Not Available
3 0.35 D-BU 5985 Accessory Wakeup Serial Data
4 - - Not Available
5 0.35 D-GN 335 Low Speed Cooling Fan Relay Control
6 0.35 D-GN/WH 465 Fuel Pump Relay Control
7 - - Not Available
8 0.35 TN 5514 Low Reference
9 0.5 TN/WH 3121 HO2S Low Signal Sensor 2
10-12 - - Not Available
13 0.35 BN 5069 PWR/TRN Relay Control
14 - - Not Available
15 0.5 GY/WH 3122 HO2S Heater Low Control Sensor 2
16 - - Not Available
17 0.5 PU 3120 HO2S High Signal Sensor 2
18 0.35 L-BU 1162 APP Sensor 2 Signal
19 0.35 PK 439 Ignition 1 Voltage
20 0.5 RD/WH 540 Battery Positive Voltage
21 0.35 PU 1272 Low Reference
22-23 - - Not Available
24 0.35 TN 2759 Low Reference
25 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
26 - - Not Available
27 0.35 BN/WH 419 MIL Control
28-29 - - Not Available
30 0.35 D-GN/WH 459 A/C Compressor Clutch Relay Control
31 - - Not Available
32 0.35 YE 447 Starter Relay Coil Control
33-34 - - Not Available
35 0.35 TN 2760 Low Reference
36 - - Not Available
37 0.35 YE 492 MAF Sensor Signal
38 - - Not Available
39 0.35 PU 30 Fuel Level Sensor Signal
40 - - Not Available
41 0.35 BN 1271 Low Reference
42 0.35 D-GN 890 Fuel Tank Pressure Sensor Signal
43 0.35 TN/BK 2500 High Speed GMLAN Serial Data Bus +
44 0.35 TN 2501 High Speed GMLAN Serial Data Bus-
45-46 - - Not Available
47 0.35 WH/BK 1164 5-Volt Reference 2
48 - - Not Available
49 0.35 D-BU 473 High Speed Cooling Fan Relay Control
50-54 - - Not Available
55 0.5 WH 17 Stop Lamp Switch Signal
56 - - Not Available
57 0.35 OG/BK 1786 Park/Neutral Signal
58 0.35 TN/BK 472 IAT Sensor Signal
59-64 - - Not Available
65 0.35 WH 2700 5-Volt Reference 1
66 0.35 GY 2709 5-Volt Reference 1
67 0.35 TN 1274 5-Volt Reference 1
68 0.35 BN 436 Air Injection Reaction Pump Relay Coil Control
69 - - Not Available
70 0.35 WH 1310 EVAP Canister Vent Solenoid Control
71-72 - - Not Available
73 0.5 PK/BK 5290 Ignition 1 Voltage
Connector Part Information 
  • Harness Type: Engine
  • OEM Connector: 34566-0103
  • Service Connector: 88988931
  • Description: 73-Way F MX123 34566 Series (BK)
Terminal Part Information 
  • Pins: 1, 3, 5, 6, 813, 18, 19, 21, 24, 25, 27, 30, 32, 35, 37, 39, 41, 42, 47, 49, 57, 58, 65-68, 70
  • 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: 9, 15, 17, 20, 43, 44, 55
  • Terminated Lead: 13575575
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Pin: 73
  • Terminated Lead: Pending
  • Release Tool: J-38125-12A
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 1326030-8/17
  • Core/Insulation Crimp: A/4
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