2006 Chevrolet HHR LS, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM) C2

Fig 1: ECM C2 Connector
GM1332467Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) Connector End Views

Connector Part Information 
  • OEM: 15471385
  • Service: 88953274
  • Description: 73-Way F Micro-Pack 64 Series (BU)
Terminal Part Information 
  • Pins:
  • Terminal:
  • Core/Insulation Crimp:
  • Release Tool/Test Probe:
Engine Control Module (ECM) C2

Pin Wire Color Circuit No. Function
1-2 - - Not Used
3 YE 581 Throttle Actuator Control Open
4 - - Not Used
5 BN 582 Throttle Actuator Control Close
6-9 - - Not Used
10 TN 1744 Fuel Injector Control (1)
11 PK/BK 1746 Fuel Injector Control (3)
12 L-BU/BK 844 Fuel Injector Control (4)
13 L-GN/BK 1745 Fuel Injector Control (2)
14 - - Not Used
15 D-GN/WH 428 EVAP Canister Purge Solenoid Control
16 - - Not Used
17 TN/WH 1423 Heated Oxygen Sensor Heater Low Control Bank 1 Sensor (2)
18 YE 400 Vehicle Speed Sensor Signal (w/M86)
19 PU 401 Vehicle Speed Sensor Low Reference (w/M86)
20-23 - - Not Used
24 GY 2701 Throttle Position Sensor 5-Volt Reference
25 GY 2704 Manifold Absolute Pressure Sensor 5-Volt Reference
26 L-BU/BK 1688 5-Volt Reference
27 - - Not Used
28 GY 2700 A/C Pressure Sensor 5-Volt Reference
29 TN/WH 1704 Sensor Low Reference
30 - - Not Used
31 TN 2752 Throttle Position Sensor Low Reference
32-33 - - Not Used
34 PK/BK 5290 Engine Main Relay Fused Control (1)
35 - - Not Used
36 PU 486 Throttle Position Sensor Signal (2)
37 - - Not Used
38 TN 2760 Intake Air Temperature Sensor Low Reference
39 - - Not Used
40 OG/BK 469 Manifold Absolute Pressure Sensor Low Reference
41 PU/WH 3110 Heated Oxygen Sensor High Signal Bank 1 Sensor 1
42 TN/WH 3111 Heated Oxygen Sensor Low Signal Bank 1 Sensor 1
43 PU/WH 1668 Heated Oxygen Sensor High Signal Bank 1 Sensor 2
44 TN/WH 1669 Heated Oxygen Sensor Low Signal Bank 1 Sensor 2
45-46 - - Not Used
47 D-GN 335 Low Speed Cooling Fan Relay Control
48 TN/BK 231 Oil Pressure Switch Signal
49 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
50 YE 410 Engine Coolant Temperature Sensor Signal
51 GY 23 Generator Field Duty Cycle Signal
52 YE 492 Mass Air Flow Sensor Signal
53 GY/WH 3113 Heated Oxygen Sensor Heater Low Control Bank 1 Sensor (1)
54 WH 423 Ignition Control Timing Control (1)
55 OG 406 Ignition Control Timing Control (2)
56-57 - - Not Used
58 D-GN 485 Throttle Position Sensor Signal (1)
59 BK/WH 2751 Signal Ground
60 - - Not Used
61 TN 2761 Coolant Temperature Sensor Low Reference
62 L-GN 432 Manifold Absolute Pressure Sensor Signal
63 OG 225 Generator Turn On Signal
64 TN/BK 2500 High Speed GMLAN Serial Data (+)
65 TN 2501 High Speed GMLAN Serial Data (-)
66 YE 573 Crankshaft Position Sensor Signal (1)
67 PU 574 Crankshaft Position Sensor Low Reference (1)
68 TN 472 Intake Air Temperature Sensor Signal
69 - - Not Used
70 BN/WH 633 Camshaft Position Sensor Signal
71 GY 1716 Knock Sensor Low Reference (1)
72 D-BU 496 Knock Sensor Signal (1)
73 BK/WH 451 Signal Ground
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.