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Engine Control Module (ECM) X1 (except HP2)

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Fig 1: Engine Control Module (ECM) X1 (except HP2) Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1 (except HP2)

Pin Wire Circuit Function
1 0.35 OG/BK 1786 Park/Neutral Signal
2-8 - - Not Used
9 0.5 L-BU/WH 6311 Brake Switch Signal
10 0.5 PU/WH 1668 HO2S High Signal - Bank 1 Sensor 2
11 0.5 TN/WH 1669 HO2S Low Signal - Bank 1 Sensor 2
12 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
13 0.35 TN 5514 Low Reference
14 0.35 PU/WH 5024 CKP Signal Low (Y91)
15 - - Not Available
16 0.35 PU 1589 Fuel Level Sensor Signal
17 0.35 D-BU/WH 473 High Speed Cooling Fan Relay Control
18 0.5 D-BU 5985 Accessory Wakeup Serial Data
19 0.5 PK 439 Ignition Voltage
20 0.5 RD/WH 440 Battery Positive Voltage
21-22 - - Not Available
23 0.35 PU 1272 Low Reference
24 0.35 D-GN 890 Fuel Tank Pressure Sensor Signal
25-26 - - Not Available
27 0.5 TN 2501 High Speed GMLAN Serial Data Bus -
28 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus +
29 0.35 D-BU 1161 Accelerator Pedal Position Sensor 1 Signal
30 0.35 BN 1271 Low Reference
31 0.35 TN/BK 6049 Low Reference
32 0.35 L-BU 1162 Accelerator Pedal Position Sensor 2 Signal
33 0.35 GY 2709 5-Volt Reference 1
34 0.35 GY/WH 2700 5-Volt Reference 1
35 - - Not Available
36 0.35 TN 1274 5-Volt Reference 1
37 0.5 TN/BK 472 Intake Air Temperature (IAT) Sensor Signal
38 0.5 TN 2760 Low Reference
39-40 - - Not Available
41 0.5 YE 492 Mass Air Flow (MAF) Sensor Signal
42-46 - - Not Available
47 0.5 PK/BK 1339 Ignition Voltage
48 0.35 WH/BK 5039 CKP Signal High (Y91)
49 0.5 TN 1671 HO2S Low Signal - Bank 2 Sensor 2
50 0.35 D-GN/WH 465 Primary Fuel Pump Relay Control (L96)
0.35 D-GN/WH 465 Fuel Pump Control Module Enable (except L96)
51 0.35 TN 1465 Secondary Fuel Pump Relay Control (except NQZ)
52 0.5 YE/BK 625 Starter Enable Relay Control
53-55 - - Not Available
56 0.35 WH/BK 1164 5-Volt Reference 2
57 0.35 YE/BK 1827 Vehicle Speed Signal (L96)
58 0.35 D-GN 335 Low Speed Cooling Fan Relay Control
59 0.35 YE 5991 Powertrain Relay Coil Control
60 - - Not Available
61 0.5 WH 1310 EVAP Canister Vent Solenoid Control
62 - - Not Available
63 0.8 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 1 Sensor 2
66-67 - - Not Available
68 0.35 BN/WH 419 Malfunction Indicator Lamp
(MIL) Control
69 0.5 PU 1670 HO2S High Signal - Bank 2 Sensor 2
70 0.35 L-BU 1937 Rear Tank Fuel Level Sensor Signal (except NQZ)
71 0.35 OG/BK 6399 Replicated Transmission Output Speed (TOS) Signal (MYD without NQH or NP0)
0.5 PU/WH 821 Replicated Transmission Output Speed (TOS) Signal (MYD with NQH or NP0)
72 0.5 L-GN/BK 822 Signal Return (MYD with NQH or NP0)
73 3 BK/WH 451 Ground
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 15499466 (L94)
  • OEM Connector: 13616079 (except L94)
  • Service Connector: 88988931
  • Description: 73-Way F Receptacle 0.64 Sealed (BK)
Terminal Part Information
  • Pins 1, 12-14, 16, 17, 23, 24, 29-34, 36, 48, 50, 51, 56-59, 68, 70 (without NP0 or NQH), 71 (without NP0 or NQH)
  • 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: 9-11, 18-20, 27, 28, 37, 38, 41, 47, 49, 52, 61, 63-65, 69, 71 (NP0 or NQH), 72 (NP0 or NQH)
  • 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
  • Pins: 73
  • Terminated Lead: Service by Terminal - 7116-4152-02
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: A/5
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