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HOMESERVICE MANUALSCHEVROLET2008HHR SS, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALBODY ELECTRICALWIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT VIEWS & COMPONENT CONNECTOR END VIEWSCOMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X2 (L61/LE5)
2008 Chevrolet HHR SS, Standard

Engine Control Module (ECM) X2 (L61/LE5)

2008 Chevrolet HHR SS, StandardSECTION Engine Control Module (ECM) X2 (L61/LE5)
Fig 1: Engine Control Module (ECM) X2 (L61/LE5) Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (L61/LE5)

Pin Wire Circuit Function
1-3 - - Not Used
4 0.5 TN 2761 Low Reference
5 0.5 PU 574 Low Reference
6 0.5 TN 1744 Fuel Injector 1 Control
7 0.5 PK/BK 1746 Fuel Injector 3 Control
8 0.5 L-BU/BK 844 Fuel Injector 4 Control
9 0.35 BN 2129 Low Reference
10 0.5 L-GN/BK 1745 Fuel Injector 2 Control
11-12 - - Not Used
13 0.35 PK/BK 2704 5-Volt Reference
14 0.5 L-GN 5282 Exhaust Cam Solenoid Control (LE5)
15 0.5 PU 5284 Intake Cam Solenoid Control (LE5)
16 0.5 YE 581 TAC Motor Control - 1
17-19 - - Not Used
20 0.5 TN 5301 Camshaft Position Intake Sensor Low Reference (LE5)
21 0.5 GY 5296 Camshaft Position Exhaust Sensor Low Reference (LE5)
22 0.35 PU 2121 IC 1 Control
23 0.35 L-BU 2123 IC 3 Control
24 0.35 D-GN/WH 2124 IC 4 Control
25 - - Not Used
26 0.35 OG/WH 2122 IC 2 Control
27-29 - - Not Used
30 0.5 D-GN/WH 428 EVAP Canister Purge Solenoid Control
31 0.5 OG 225 Generator Turn On Signal
32 0.5 BN 582 TAC Motor Control - 2
33 0.5 D-BU 5300 Camshaft Position Intake Sensor Supply Voltage (LE5)
34 0.5 YE/BK 5297 Camshaft Position Exhaust Sensor Supply Voltage (LE5)
35 0.5 GY 6255 Low Reference
36 - - Not Used
37 0.5 PU/WH 3110 HO2S Reference Voltage (Bank 1 Sensor 1)
38 0.5 PU 3120 HO2S High Signal (Bank 1 Sensor 2)
39 0.35 L-GN 432 MAP Sensor Signal
40 0.35 TN 2752 Low Reference
41 0.5 PU/WH 6256 A/C High Side Pressure Sensor Ground
42 0.35 TN 2760 Low Reference
43 0.5 GY 23 Generator Field Duty Cycle Signal
44 - - Not Used
45 0.5 YE 573 CKP Sensor 1 Signal
46 0.5 OG 5275 Camshaft Position Intake Sensor (LE5)
47 0.5 D-GN 5273 Camshaft Position Exhaust Sensor (LE5)
48 0.5 TN/WH 3111 HO2S Low Reference (Bank 1 Sensor 1)
49 0.35 OG/BK 469 Low Reference
50 0.5 GY 1716 Knock Sensor 2 Signal
51 0.5 D-BU 496 Knock Sensor 1 Signal
52 - - Not Used
53 0.35 GY 2701 5-Volt Reference
54 0.5 L-GN 2867 5-Volt Reference
55-56 - - Not Used
57 0.35 D-GN 485 TP Sensor 1 Signal
58 0.5 YE 410 ECT Sensor Signal
59 0.35 PU 486 TP Sensor 2 Signal
60 0.5 BN 6753 Intake Cam Solenoid Return (LE5)
61 0.5 BN/WH 6754 Exhaust Cam Solenoid Return (LE5)
62-64 - - Not Used
65 0.5 GY/WH 3113 HO2S Heater Low Control - Bank 1 Sensor 1
66 0.5 GY/WH 3122 HO2S Heater Low Control - Bank 1 Sensor 2
67 0.5 TN/BK 231 Oil Pressure Switch Signal
68 0.5 TN/WH 3121 HO2S Heater Low Control - Bank 1 Sensor 1
69-72 - - Not Used
73 2.0 BK/WH 451 Signal Ground
Connector Part Information 
  • OEM: 34566-0203
  • Service: See Catalog
  • Description: 73-Way F MX123 34566 Series (BK)
Terminal Part Information 
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit
RENDER: 1.0x

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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.