LewiSS

Does anyone have a list of the pinouts for the 2006 2.4 ECU connector? We need it to work up a tune with the piggy-back computer for turbocharging (it needs to tie in to specific signals in the existing ECU).

I'm sure one of the GM manuals for the 2.4 has this, but I don't have access to a GM mechanic these days.

Brandon97Z

iTrader: (1)

Why would you want to piggyback it when you have hptuners and ls2 edit tuning software available for the 2.4?

bc3tech

+1!

LewiSS

Explain to me how HPTune can make the stock computer reduce timing when the turbo makes boost and I'll go with it. Since the stock computer does not have manifold pressure input, I don't see how it can be done. And I won't run a turbo unless the timing can be altered based on boost. I'd rather not melt the pistons.

Same with fuel - since a turbo can make full boost at less than WOT and less than redline, the only way to make the stock computer produce safe fuel curves is to run it too rich off boost.

Could you get by with the stock computer and HPTune? Yes. Would it be optimal? No. A turbo requires some engine management that the stock computer cannot provide (namely, a boost sensor and fuel/spark adjusted accordingly).

denniss

Document ID# 1597180
2006 Chevrolet Cobalt


--------------------------------------------------------------------------------

Engine Control Module Connector End Views
Connector 1: Engine Control Module (ECM) C1
Connector 2: Engine Control Module (ECM) C2
Connector 3: Engine Control Module (ECM) C3

Engine Control Module (ECM) C1



Connector Part Information
OEM: 15492320
Service: 88988821
Description: 56-Way F Micro 64 Series Sealed (BU)

Terminal Part Information
Pins: 16, 35, 37, 41
Terminal/Tray: See Terminal Repair Kit
Core/Insulation Crimp: See Terminal Repair Kit
Release Tool/Test Probe: See Terminal Repair Kit
Pins: 2, 6, 19, 20, 55
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Pins: 7, 9, 12, 13, 18, 33, 34, 36, 40, 44, 47, 48, 49, 53, 54, 56
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C1 Pin
Wire Color
Circuit No.
Function

1
--
--
Not Used

2
PU
420
TCC Brake Switch/Cruise Control Release Signal

3-5
--
--
Not Used

6
BN/WH
379
CPP Switch Signal

7
L-BU
20
Stop Lamp Switch Signal

8
--
--
Not Used

9
TN
2759
Low Reference

10-11
--
--
Not Used

12
BN/WH
419
MIL Control

13
D-GN/WH
465
Fuel Pump Relay Control

14-15
--
--
Not Used

16
PU
16
VSS Low Signal

17
--
--
Not Used

18
BN
4
Accessory Voltage

19
PK/BK
1039
Ignition 1 Voltage

20
RD/WH
840
Battery Positive Voltage

21-32
--
--
Not Used

33
WH/BK
1164
5-Volt Reference-1

34
GY
2709
5-Volt Reference-1

35
PU
1272
5-Volt Reference-1

36
BN
1271
Low Reference

37
tn
1274
Low Reference

38-39
--
--
Not Used

40
BN
5069
Powertrain relay Control

41
YE
400
VSS High Signal

42-43
--
--
Not Used

44
PU
1589
Fuel Level Sensor Signal

44-46
--
--
Not Used

47
D-BU
1161
APP Sensor 1 Signal

48
D-GN
890
Fuel Tank Pressure Sensor Signal

49
L-BU
1162
APP Sensor 2 Signal

50-52
--
--
Not Used

53
D-GN/WH
459
A/C Compressor Clutch Relay Control

54
D-BU
473
High Speed Cooling Fan Relay Control

55
WH
1310
EVAP Canister Vent Solenoid Control

56
YE
447
Starter Relay Coil Control


Engine Control Module (ECM) C2



Connector Part Information
OEM: 15492322
Service: 88988360
Description: 73-Way F GT 280 Series Micro 64 Sealed (BK)

Terminal Part Information
Pins: 18, 19
Terminal/Tray: See Terminal Repair Kit
Core/Insulation Crimp: See Terminal Repair Kit
Release Tool/Test Probe: See Terminal Repair Kit
Pins: 73
Terminal/Tray: 7116-4152-02/9
Core/Insulation Crimp: 2/5
Release Tool/Test Probe: 12094430/J-35616-35 (VT)
Pins: 1, 8, 9, 14, 17, 20, 23, 30, 33, 35, 36, 39, 42, 46, 50, 53, 56, 59, 62, 67
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Pins: 2 -- 5, 11, 12, 13, 27, 29, 32, 43, 44, 48, 63, 64, 66, 68, 69, 71, 72,
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: Pins 2 -- 5, 27, 29, 32, 43, 44, 48, 63, 64, 66, 68, 69, 71, 72: J/J
Core/Insulation Crimp: Pins 11 -- 13: K/K
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C2 Pin
Wire Color
Circuit No.
Function

1
PU
2121
IC 1 Control

2
TN/WH
3111
HO2S Low Reference Bank 1 Sensor 1

3
PU/WH
3110
HO2S Reference Voltage Bank 1 Sensor 1

4
PU/WH
1668
HO2S High Signal - Bank 1 Sensor 1

5
TN/WH
1669
HO2S Low Signal - Bank 1 Sensor 2

6-7
--
--
Not Used

8
D-BU
496
Knock Sensor Signal

9
GY
1716
Low Reference

10
--
--
Not Used

11
YE
581
TAC Motor Control (1)

12
BN
582
TAC Motor Control (2)

13
PK/BK
5293
Ignition 1 Voltage

14
PK/BK
6395
CMP Actuator Solenoid Control Intake

15-16
--
--
Not Used

17
L-BU
2123
IC 3 Control

18
YE
400
VSS High Signal (w/M86)

19
PU
401
VSS Low Signal (w/M86)

20
GY
5296
Low Reference

21-22
--
--
Not Used

23
TN
5301
Low Reference

24-26
--
--
Not Used

27
PU
574
Low Reference

28
--
--
Not Used

29
TN
2752
Low Reference

30
L-GN
5282
Low Reference

31
--
--
Not Used

32
L-GN/BK
1745
Fuel Injector (2) Control

33
D-GN/WH
2124
IC 4 Control

34
--
--
Not Used

35
BN
2129
Low Reference

36
YE/BK
5297
5-Volt Reference-1

37-38
--
--
Not Used

39
D-BU
5300
5-Volt Reference-1

40-41
--
--
Not Used

42
TN
2760
Low Reference

43
L-GN
2867
5-Volt Reference-2

44
GY
2701
5-Volt Reference-2

45
--
--
Not Used

46
PU
5284
Low Reference

47
--
--
Not Used

48
PK/BK
1746
Fuel Injector (3) Control

49
--
--
Not Used

50
WH/BK
6396
CMP Actuator Solenoid Control Exhaust

51-52
--
--
Not Used

53
OG/WH
2122
IC 2 Control

54-55
--
--
Not Used

56
D-GN
5273
CMP Sensor Signal

57-58
--
--
Not Used

59
OG
5275
CMP Sensor Signal

60-61
--
--
Not Used

62
TN
472
IAT Sensor Signal

63
YE
573
CKP Sensor Signal

64
D-GN
485
TP Sensor 1 Signal

65
--
--
Not Used

66
PU
486
TP Sensor 2 Signal

67
YE
492
MAF Sensor Signal

68
BK/WH
3113
HO2S Heater Low Control - Bank 1 Sensor 1

69
BK/WH
3122
HO2S Heater Low Control - Bank 2 Sensor 1

70
--
--
Not Used

71
L-BU/BK
844
Fuel Injector (4) Control

72
TN
1744
Fuel Injector (1) Control

73
BK/WH
451
Ground


Engine Control Module (ECM) C3



Connector Part Information
OEM: 15492321
Service: 88988361
Description: 73-Way F GT 280 Series Micro 64 Sealed (GY)

Terminal Part Information
Pins: 7, 21, 23, 29, 33, 35, 37, 39, 47, 48, 49, 53, 55, 57, 59, 65
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Pins: 28, 44
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C3 Pin
Wire Color
Circuit No.
Function

1-6
--
--
Not Used

7
OG
225
Generator Turn On Signal

8-20
--
--
Not Used

21
BK/WH
2751
Low Reference

22
--
--
Not Used

23
OG/BK
469
Low Reference

24-27
--
--
Not Used

28
TN/WH
1704
Low Reference

29
GY/WH
23
Generator Field Duty Cycle Signal

30-32
--
--
Not Used

33
TN
2501
High Speed GMLAN Serial Data (-)

34
--
--
Not Used

35
TN
2761
Low Reference

36
--
--
Not Used

37
GY
2700
5-Volt Reference-1

38
--
--
Not Used

39
GY
2704
5-Volt Reference-1

40-43
--
--
Not Used

44
L-BU/BK
1688
5-Volt Reference-2

45-46
--
--
Not Used

47
D-GN
1433
PNP/Clutch Start Switch Signal (M86)

48
D-GN/WH
428
EVAP Canister Purge Solenoid Control

49
D-GN
335
Low Speed Cooling Fan Relay Control

50-52
--
--
Not Used

53
TN/BK
2500
High Speed GMLAN Serial Data (+)

54
--
--
Not Used

55
YE
410
ECT Sensor Signal

56
--
--
Not Used

57
OG/BK
380
A/C Refrigerant Pressure Sensor Signal

58
--
--
Not Used

59
L-GN
432
MAP Sensor Signal

60-64
--
--
Not Used

65
TN/BK
231
Oil Pressure Switch Signal

66-73
--
--
Not Used

bigworm

even with partial throttle boost, you tune your MAF for 14.7:1 without any WOT up until you click over to open loop... then tune your spark normally for where you want it. THEN you adjust your WOT and PE spark adder.

Im not saying your doing it wrong, the way your doing will work just fine if not better, but its really not that big of a deal to tune it correctly in hp tuners.

LewiSS

DeniSS!! You're the MAN!

THANKS!!! PM sent.

I'm not sure where the FA ratio goes before WOT, but I know from my dyno time that the 2.4 runs WAY rich under open loop. I thought about tuning first with HPTune for best performance under non-boost, then tuning the piggy-back to provide boost compensation.

I think what we might do is install the turbo, set up the piggy-back, run on the dyno under all throttle conditions, and see what the FA ratio and ignition looks like. We might actually use the overly rich condition to our advantage, and might not need additional fuel. However, I believe we'll still need to back off timing slightly under boost. Won't know until we get it on the dyno and log some things.

But I appreciate your input. It makes more sense than just expecting a tuned stock ECU to be able to deal with boost at part throttle (below WOT) and mid-RPM situations. This is one reason GM picked a supercharger, IMHO, because they're actually much easier to tune. But I LOVE that mid-range kick a turbo has over a supercharger, especially on the street.