Engine Control Module (ECM) C3

2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Engine Control Module (ECM) C3
WARNING: This page is about a different car, the 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) C3 Connector End View
GM1673472Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C3

Pin Wire Circuit Function
1-2 - - Not Available
3 0.5 TN 1667 HO2S Low Signal - Bank 2 Sensor 1 (5.3L, 6.0L)
4 0.5 PU 1666 HO2S High Signal - Bank 2 Sensor 1 (5.3L, 6.0L)
5 0.5 PU 1670 HO2S High Signal - Bank 2 Sensor 2 (5.3L, 6.0L)
6 0.5 TN 1671 HO2S Low Signal - Bank 2 Sensor 2 (5.3L, 6.0L)
7 0.35 PU 5428 Generator Regulator Control
8 - - Not Available
9 0.5 BN 436 Air Pump Relay Control (4.2L)
10 0.5 GY 5493 Cylinder Shutoff Solenoid Control (3) (5.3L, 6.0L)
11 0.5 D-BU 5491 Cylinder Shutoff Solenoid Control (1) (5.3L, 6.0L)
12 0.35 TN/BK 464 Delivered Torque Signal
13-14 - - Not Available
15 0.5 L-GN 3212 HO2S Heater Low Control - Bank 2 Sensor 1 (5.3L, 6.0L)
16 - - Not Available
17 0.35 OG/BK 463 Requested Torque Signal
18-20 - - Not Available
21 0.35 BK 2751 Low Reference
22 - - Not Available
23 0.35 OG/BK 469 Low Reference
24-25 - - Not Available
26 0.5 D-BU/WH 6785 Air Injection Reaction Control Valve 1 Low Reference (4.2L)
27 - - Not Available
28 - - Not Used
29 0.35 GY 23 Generator Field Duty Cycle Signal
30-32 - - Not Available
33 0.35 TN 2501 High Speed GMLAN Serial Data Bus -
34 - - Not Available
35 0.35 BK 2761 Low Reference
36 - - Not Available
37 0.35 GY 2700 5-Volt Reference
38 - - Not Available
39 0.35 GY 2704 5-Volt Reference
40-41 - - Not Available
42 0.5 BN/WH- 6789 Air Injection Reaction Control Valve 1-Volt Reference (4.2L)
43 - - Not Available
44 - - Not Used
45-46 - - Not Available
47 0.35 OG/BK 1786 PNP Switch Signal
48 0.5 D-GN/WH 428 EVAP Canister Purge Solenoid Control
49 - - Not Used
50 0.5 RD/WH 3223 HO2S Heater Low Control - Bank 2 Sensor 2 (5.3L, 6.0L)
51-52 - - Not Available
53 0.35 TN/WH 2500 High Speed GMLAN Serial Data Bus +
54 - - Not Available
55 0.35 YE 410 ECT Sensor Signal
56 - - Not Available
57 0.35 RD/BK 380 A/C Refrigerant Pressure Sensor
58 - - Not Available
59 0.35 L-GN 432 MAP Sensor Signal
60-61 - - Not Available
62 0.5 YE 6787 Secondary Air Injection Pressure Sensor Signal (4.2L)
63 - - Not Available
64 - - Not Used
65 0.35 TN/BK 231 Oil Pressure Switch Signal (4.2L)
66 0.35 YE 400 Signal High - Front
67 - - Not Available
68 0.5 L-GN 5492 Cylinder Shutoff Solenoid Control (4) (5.3L, 6.0L)
69 0.5 OG 5494 Cylinder Shutoff Solenoid Control (2) (5.3L, 6.0L)
70-72 - - Not Available
73 - - Not Used
Connector Part Information 
  • OEM: 13608385 (4.2L)/13574284 (5.3L/6.0L)
  • Service: 88988372
  • Description: 73-Way F Receptacle 0.64 2.8 Series Sealed (GY)
Terminal Part Information 
  • Pins: 3-6, 10-11, 15, 26, 42, 48, 50, 62, 68-69
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 7, 12, 17, 21, 23, 29, 33, 35, 37, 39, 47, 49, 53, 55, 57, 59, 65, 66
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
RENDER: 1.0x

NO RELATED

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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.