2006 Chevrolet HHR LS, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM) C1

Fig 1: Powertrain Control Module (PCM) C1 & C3 Connector End View
GM1228485Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) Connector End Views

Connector Part Information 
  • OEM: 15452125
  • Service: 88953346
  • Description: 56-Way F Micro-Pack 64 Series (BU)
Terminal Part Information 
  • Pins:
  • Terminal:
  • Core/Insulation Crimp:
  • Release Tool/Test Probe:
Engine Control Module (ECM) C1

Pin Wire Color Circuit No. Function
1 PU 1589 Primary Fuel Level Sensor Signal
2 L-BU 1162 Accelerator Pedal Position Signal (2)
3 D-GN 890 Fuel Tank Pressure Sensor Signal
4 D-BU 1161 Accelerator Pedal Position Signal (1)
5 - - Not Used
6 D-GN 1433 Clutch Start Switch Signal
7 - - Not Used
8 BN/WH 379 Cruise Control Clutch Pedal Position Switch Signal (w/M86)
9 PU 420 Torque Converter Clutch Brake Switch Signal
10 WH/BK 1164 Accelerator Pedal Position 5-Volt Reference (1)
11 L-BU 20 Stop Lamp Supply Voltage
12 BN 4 Accessory Voltage
13 GY 2709 Fuel Tank Pressure Sensor 5-Volt Reference
14 D-GN/WH 465 Fuel Pump Primary Relay Control
15-17 - - Not Used
18 BN 5069 Engine Main Relay Coil Control
19-27 - - Not Used
28 PK 1039 Run/Crank Ignition 1 Voltage
29 - - Not Used
30 WH 1310 EVAP Canister Vent Solenoid Control
31 D-GN/WH 459 A/C Compressor Clutch Relay Control
32-40 - - Not Used
41 TN 1274 Accelerator Pedal Position 5-Volt Reference (2)
42-44 - - Not Used
45 BN/WH 419 Check Engine Indicator Control
46 YE 447 Starter Relay Coil Control
47-51 - - Not Used
52 RD/WH 840 Battery Positive Voltage
53 BN 1271 Accelerator Pedal Position Low Reference (1)
54 TN 2759 Fuel Tank Pressure Sensor Low Reference
55 - - Not Used
56 PU 1272 Accelerator Pedal Position Low Reference (2)
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.