2004 Pontiac Aztek Base, FWDFACTORY OEM SERVICE PROCEDURE

Engine Control Module Connector End View (ECM) C2

Engine Control Module Connector End View (ECM) C2

GM1331455Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 1928403386
  • 64-Way F (BLK)
Pin Wire Color Circuit No. Function
1 PNK 5290 Ignition 1 Voltage
2 - 3122 Not Used
3 PNK 239 Ignition 1 Voltage
4 DK BLU 473 High Speed Cooling Fan Relay Control
5 WHT 121 Engine Speed Signal
6 - - Not Used
7 WHT/BLK 1164 5-Volt Reference
8 PPL 1272 Low Reference
9 RED/BLK 380 A/C Refrigerant Pressure Sensor Signal
10 WHT 5371 Stop Lamp Switch Signal
11 TAN 472 IAT Sensor Signal
12 DK GRN 890 Fuel Tank Pressure Sensor Signal
13 - - Not Used
14 GRY/BLK 87 Cruise Control Resume/Accel Switch Signal
15 ORN/BLK 463 Requested Torque Signal
16 - - Not Used
17 PNK 5290 Ignition 1 Voltage
18 - - Not Used
19 DK GRN/WHT 465 Fuel Pump Relay Control
20 DK GRN 335 Low Speed Cooling Fan Relay Control
21 - - Not Used
22 DK GRN 389 Vehicle Speed Signal Output
23 TAN/WHT 2500 CAN Serial Data High
24 BRN 5069 Engine Controls Main Relay Control
25 BLK 2759 Low Reference
26 BLK 2760 MAF Sensor Low Reference
27 - - Not Used
28 - - Not Used
29 PPL/WHT 1668 HO2S Signal Bank 1 Sensor 2
30 DK BLU 84 Cruise Control Set/Coast Switch
31 YEL 5 Crank Voltage
32 ORN/BLK 1786 PNP Signal
33 WHT 1310 EVAP Canister Vent Solenoid Control
34 - - Not Used
35 YEL/BLK 625 Starter Relay Control
36 ORN 540 Battery Positive Voltage
37 TAN/BLK 464 Delivered Torque Signal
38 - - Not Used
39 GRY 596 5-Volt Reference
40 BRN 1271 Low Reference
41 - - Not Used
42 PPL 1589 Fuel Level Sensor Signal - Primary
43 YEL 492 MAF Sensor Signal
44 LT BLU 1162 APP Sensor 2 Signal
45 GRY 397 Cruise Control On Switch Signal
46 PPL 420 Cruise Control Release Signal
47 - - Not Used
48 DK GRN 1049 Class 2 Serial Data
49 DK GRN/WHT 459 A/C Clutch Relay Control
50 BRN/WHT 419 MIL Control
51-54 - - Not Used
55 TAN 2501 CAN Serial Data Low
56 TAN 1274 5-Volt Reference
57 TAN/WHT 1669 HO2S Low Reference Sensor 1
58 DK GRN 500 Accessory Voltage
59 - - Not Used
60 DK BLU 1161 APP Sensor Signal 1
61-64 - - Not Used
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.