P1619 thermostat control signal low - BMW 02 03 04 05 06 3 Series E46 325i 330i M3 Radio Mp3 Cd Mode 65126919072

Did you have the new PCM / ECM programmed to the vehicle , anti-theft key programmed to the vehicle ? P1631 Immobilizer fuel enable signal not correct ? need key programmed .Your best bet,take it to a qualified repair shop. You have no idea what your dealing with .

Wild guess the fan was replaced with a one speed motor. Or the selector switch is bad or not connected. Or the relay/s for other speeds are not getting thermostat signal for some reason.

I'm not sure if the thermostat is wired correctly. First, the thermostat is wired directly to the outdoor unit (compressor/condenser unit). It is NOT directly connected to the indoor unit. It connects to a low voltage control panel in the outdoor unit that sends a signal to your indoor fan/evaporator. This wire is called the fan relay switch and physically runs between the low voltage controls of the indoor and outdoor units. If the fan relay is bad it's possible that the unit runs continuously. To prevent destroying your outdoor unit there is a safety feature that prevents the indoor fan from shutting down while the outdoor unit is running. If the indoor fan did shut down while the outdoor unit was running than you would slug your compressor. That is, your compressor normally sees refrigerant gas but is instead seeing refrigerant liquid. That would not be good since this scenario would destroy your compressor. It sounds like a faulty fan relay. The actual contactor portion of the relay is in the outdoor unit.

PCM pinout diagrams

2001 silverado (Thanks Banker099)

Try this link for page below


This image has been resized. Click this bar to view the full image. The original image is sized 799x247 and weights 17KB.

Powertrain Control Module (PCM) C1 (BLU)



Connector Part Information
• PCM Connector C1 Assembly 12191489

• TPA (BLU) 12176408

• Connector Cover 12191108

Pin
Wire Color
Circuit No.
Function

1
BLK/WHT
451
Ground

2
LT GRN
1867
12 Volt Reference

3
PNK/BLK
1746
Fuel Injector 3 Control

4
LT GRN/BLK
1745
Fuel Injector 2 Control

5-10
--
--
Not Used

11
LT BLU
1876
Knock Sensor 2 Signal

12
DK BLU/WHT
1869
CKP Sensor Signal

13
ORN/BLK
463
Requested Torque Signal

14
ORN/BLK
1061
UART Serial Data [Secondary]

15
DRK BLU/WHT
774
UART Serial Data [Tertiary]

16
--
--
Not Used

17
DK BLU
1225
Transmission Fluid Pressure Switch Signal B

18
RED
1226
Transmission Fluid Pressure Switch Signal C

19
PNK
439
Ignition 1 Voltage

20
ORN
440
Battery Positive Voltage

21
YEL
1868
Low Reference

22
--
--
Not Used

23
PPL
719
Low Reference

24
--
--
Not Used

25
TAN
1671
HO2S Low Signal [- Bank 2 Sensor 1]

25
TAN
413
HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors)

26
TAN
1667
HO2S Low Signal [- Bank 2 Sensor 2]

26
TAN
413
HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors)

27
--
--
Not Used

28
TAN/WHT
1669
HO2S Low Signal [- Bank 1 Sensor 2]

28
TAN
413
HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors)

29
TAN/WHT
1653
HO2S Low Signal [- Bank 1 Sensor 1]

29
TAN
413
HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors)

30
LT GRN
1478
Coolant Level Switch Signal

31
--
--
Not Used

32
BLK/WHT
771
Transmission Range Switch Signal A

33
PPL
420
TCC Brake Switch Signal

34
WHT
776
Transmission Range Switch Signal P

35
GRA
48
CPP Switch Signal

36
BLK
1744
Injector 1 Control

37
YEL/BLK
846
Injector 6 Control

38
PNK/WHT
1101
Damping Lift/Dive Signal

39
--
--
Not Used

40
BLK/WHT
451
Ground

41
BLK
407
Low Reference

41
GRA
720
Low Reference (w/o Delphi HO2S)

42
--
--
Not Used

43
RED/BLK
877
Fuel Injector 7 Control

44
LT BLU/BLK
844
Fuel Injector 4 Control

45
GRA
474
5 Volt Reference (FTP Sensor)

46
GRY
474
5 Volt Reference (TPS Sensor)

47
GRY
597
5 Volt Reference (MAP Sensor)

48
GRA
596
5 Volt Reference (EGR Sensor)

49 50
--
--
Not Used

51
DK BLU
496
KS [1] Signal

52
--
--
Not Used

53
BLK
470
Low Reference

54
BLK
452
Low Reference

55
BRN
1456
EGR Valve Position Signal

56
--
--
Not Used

57
ORN
440
Battery Positive Voltage

58
DK GRN
1049
ECM/PCM/VCM Class 2 Serial Data

59
YEL
710
Class 2 Serial Data

60
ORN/BLK
469
Low Reference

61
PNK/BLK
632
Low Reference

62
--
--
Not Used

63
GRA
720
Low Reference

63
TAN
413
HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors)

64
--
--
Not Used

65
PPL
1670
HO2S High Signal [- Bank 2 Sensor 2]

66
PPL
1666
HO2S High Signal [- Bank 2 Sensor 1]

67
--
--
Not Used

68
PPL/WHT
1668
HO2S High Signal [- Bank 1 Sensor 2]

69
PPL/WHT
1665
HO2S High Signal [- Bank 1 Sensor 1]

70
BRN
1174
Oil Level Switch Signal

71
--
--
Not Used

72
YEL
772
Transmission Range Switch Signal B

73
BRN/WHT
633
CMP Sensor Signal

74
YEL
410
ECT Sensor Signal

75
PNK
1020
Off/Run/Crank Voltage

76
BLK/WHT
845
Fuel Injector 5 Control

77
DK BLU/WHT
878
Fuel Injector 8 Control

78
--
--
Not Used

79
WHT
687
3-2 Shift Solenoid Valve Control

80
ORN/BLK
510
Low Reference
This image has been resized. Click this bar to view the full image. The original image is sized 799x247 and weights 17KB.

It sounds like that unit is connected to a "power saving load controller" device from the power company. The power company can turn your unit on & off with a radio signal. If you manually activated contactor and unit ran. I would bet that the power company's device or the wiring connecting it is where the problem lies. Call the power company and have them check their device. If they tell you that the device has been tested remotely and is working fine. Explain to them that you can activate your unit manually and it works fine. They should not charge you to come out. Those "load controller devices" have a pretty good longevity record.

Hi David:

P1619 is a thermostat error, you likely need to replace it or you have a bad sensor. P0174 (I'm guessing that's what you meant, not just 174) is a bit trickier to troubleshoot. There is a good video here showing where to start:

Yes here is that list.
Chrysler products COMMON CODES OBD1 (vehicles made before 1995)
Part 1: Chrysler Domestic vehicles
CODES/Meaning
88 display used for start or test
11 camshaft signal or ignition signal, no reference signal during cranking
12 memory to controller has been cleared within 50-100 engine starts
13 map sensor not detecting any change during test
14 map voltage too high or too low
15 vehicle speed sensor, no signal detected
16 knock sensor circuit. open or short detected
17 low engine temperature, possible thermostat fault
21 oxygen sensor signal, neither rich or lean detected
22 coolant sensor voltage low
23 air charge voltage high/low detected
24 throttle positioner sensor voltage high/low
25 automatic idle speed motor driver circuit, short or open detected
26 injectors 1,2,3 peak current not reached
27 injector control circuit does not respond to control signal
31 purge solenoid circuit, open or short detected
32 egr solenoid circuit, open or short detected
33 a/c clutch relay circuit, open or short detected
34 speed control servo solenoid, open or short detected
35 radiator fan control relay circuit, open or short detected
36 wastegate solenoid, open or short detected
37 part throttle unlock(PTU) circuit, open or short detected
41 charging system circuit not responding to control signal
42 fuel pump or auto shutdown (ASD) relay voltage sensed at controller
43 ignition control circuit not responding
44 battery temperature voltage circuit problem
45 turbo boost limit exceeded-map sensor detects overboost
46 battery voltage too high
47 battery voltage too low
51 air/fuel at limit
52 logic module fault
53 internal controller failure
54 camshaft reference circuit not detected
55 end of message
61 baro read solenoid, open or short detected
62 emr mileage not stored
63 eeprom write denied
64 flex fuel sensor signal out of range
65 manifold tuning valve, open or short detected
66 no ccd messages
76 ballast bypass relay, open or short detected
77 speed control relay, open or short detected

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

The white wires are neutral. The low voltage wires are used on the thermostat terminal and the 12 pin connector. The high voltage wire uses the spade terminals. Trace back the wires to each component and you will know which connection goes where.

To answer your question that is how the coil is supposed to be wrapped. Just because the unit stays really cold has nothing to do with low freon. Low freon you would ice up and the system would be warm. This sounds like your really is bad and needs to be replaced, due to the fact that nothing is telling the copressor to shut down. This is how it works. The thermostat sends a signal to the thermocouple, which in return sends a signal to the relay which sends a signal to the compressor to run or stop. If the relay goes bad it will let the compressor run all the time. Please rate if you are satisfied