Problem: the temperature rises instantly to the red part with the appearance of the STOP light, almost 25 km away when driving on highway, the fan is running at maximum, when I disconnect the + from the battery and plug it in, everything becomes normal, I changed the calorstat, even removed it, I changed the temperature sensor, checked the engine interior, checked the pump, everything is fine, but the problem remains the same after about 25km. Do you have any suggestions please?
Engine temperature too high - STOP warning on dash - but engine is cold
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You may have a short circuit in the wire that connects to the temperature sensor. Can you provide some more information about your car:- year of manufacture and engine details.
its peugeot 206 - petrol - year of manufacture 2005 - on engine it written "Z05". Thank you
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I think the Z05 is cylinder head casting for a 1.4 litre 8 valve petrol engine probably a TU3JP. That engines use at least two different engine control units (ECU) but in all cases the two wires from the temperature sensor connect to the ECU. The first thing to do is try and follow the wires from the temperature sensor to the ECU and see if there is a point where the wires were rubbing on a sharp edge.
It would help identify the correct wiring diagram if you can let me know if the car has air-conditioning and if so is it the manual or the automatic type. It would also help if you could provide the first part of your VIN. An example of the letters I want is: 2AKFWF. The letters KFW is the code for a TU3JP engine.
It would help identify the correct wiring diagram if you can let me know if the car has air-conditioning and if so is it the manual or the automatic type. It would also help if you could provide the first part of your VIN. An example of the letters I want is: 2AKFWF. The letters KFW is the code for a TU3JP engine.
Sure, its has no air-conditioning and its manual, the VIN is: VF32AHFXU44664012
Thank you again, I really appreciate it.
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Peugeot Service Box doesn't recognise that VIN. If I use the last part of the number it suggests the full VIN is
VF32AKFUF44664012 which is for a 206 5 DOOR SALOON 1.4 i 16v 90 Manual gearbox 5
Sorry, the last 2 digits are 76 not 12, VF32AHFXU44664076.
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Okay that means the car has a 1.1 litre petrol engine (TU1JP) with a 5 speed gearbox -206 5 DOOR SALOON 1.1 i (TU1JP) Manual gearbox 5
I have attached some diagrams relating to the cooling on your engine.
The first diagram is the schematic of the cooling system:
Block 4005 is the cooling sensor
Block 1320 is the engine ECU
Block 1510 is the cooling fan
Block 1500 cooling fan relay
Block BM34 engine fuse box
Block BSI1 Built In System Interface (cabin fuse box)
Block 1630 Automatic gearbox - not applicable to your car
Block C001 Diagnostic connector
The second diagram shows that the temperature sensor connects to pins E4 and D4 of the engine ECU 32 pin black connector.
To check the wiring you need a multimeter.
The instructions are:
Open the drivers window for access
Open the bonnet
Turn everything off, remove the key and shut the doors (no need to lock them)
Wait at least 3 minutes and then disconnect the battery
Remove the 32 pin black plug from the ECU amd measure the resistance between pins E4 and D4 of the plug. The plug pins should be numbered. The resistance needs to be between 2000 to 5000 Ohms. If the resistance is close to 0 Ohms it means there is a short circuit.
I will do that, thank you very much sir!
Hello sir, I measured the resistance between E4 and D4, it shows 3903 Ohms. as the picture attached.
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That is the right idea but can you do the test on the plug rather than the ECU.
On the plug, keep changing from 350 kOms and 490 kOhms not an exact value, if it was a short here the STOP will show up the moment I start the engine, but the issue always appear after 20 Km or so when driving. very weird.
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Those resistance values are far too high. I think you have a connection problem. The two pins should connect directly to the temperature sensor. I expect the sensors resistance to be about 5 kOhms. If you are able try to measure the resistance between the two pins on the sensor itself.
The sensor is a thermistor (temperature dependant resistor). They type they use is a NTC (Negative Temperature Coefficient). This means the hotter the sensor get the lower the resistance. Hence if the car is reading a high temperature it would normally suggest a short circuit. However, in you case I think there is a bad connection to the sensor which may get worse when the engine get hot. It is quite possible that the car's computer is giving an overheat warning when there is a poor connection to the sensor.
Thank you, I will do that, I will also replace the 2 pin connector of the sensor maybe it the one causing this bad connectivity.
Thank you again, I really appreciated
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It may be worth checking the cable for continuity:Thank you, I will do that, I will also replace the 2 pin connector of the sensor maybe it the one causing this bad connectivity.
Thank you again, I really appreciated
Pin E4 of the large black ECU plug connects to pin 1 of the two pin plug
Pin D4 of the large black ECU plug connects to pin 2 of the two pin plug
We were measuring on the wrong plug, when I checked the cable for continuity I found that its connected to the 24 pin on the right side, the resistance showed is 6.02 kOhms, I changed the head connected to the sensor, tomorrow I will do a drive test and let you know, Thank you!
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The value of 6.02 kOhms sounds about right to me. Thermistors are specified by their resistance at 25˚C and their Beta coefficient (see https://en.wikipedia.org/wiki/Thermistor). A lot of 5 kOhm NTC thermistors have a Beta of 3950 which would read 6 kOhms at 21˚C. I have pasted a table of temperature (˚C) and resistance below. It would be worth checking your sensor resistance when you get the high temperature warning.
Peugeot identify their connectors by the number of pins and colour. The ECU should have three mating connectors (plugs) Black, Brown and Grey. The cover at the back of all the connectors is usually the same colour but the actual connector shell (the part the holds the pins) is the connector colour Peugeot reference. In your photo the centre connector has 48 pins and the two end connector have 32 which confirms the centre connector is the wrong one.
Peugeot identify their connectors by the number of pins and colour. The ECU should have three mating connectors (plugs) Black, Brown and Grey. The cover at the back of all the connectors is usually the same colour but the actual connector shell (the part the holds the pins) is the connector colour Peugeot reference. In your photo the centre connector has 48 pins and the two end connector have 32 which confirms the centre connector is the wrong one.
| B or Beta | 3950 | |
| Ro | 5000 | |
| T | T+273.15 | R |
-30 | 243.15 | 100,101.95 |
-29 | 244.15 | 93,658.18 |
-28 | 245.15 | 87,676.78 |
-27 | 246.15 | 82,121.41 |
-26 | 247.15 | 76,958.79 |
-25 | 248.15 | 72,158.47 |
-24 | 249.15 | 67,692.56 |
-23 | 250.15 | 63,535.49 |
-22 | 251.15 | 59,663.82 |
-21 | 252.15 | 56,056.02 |
-20 | 253.15 | 52,692.35 |
-19 | 254.15 | 49,554.63 |
-18 | 255.15 | 46,626.20 |
-17 | 256.15 | 43,891.69 |
-16 | 257.15 | 41,336.98 |
-15 | 258.15 | 38,949.05 |
-14 | 259.15 | 36,715.93 |
-13 | 260.15 | 34,626.56 |
-12 | 261.15 | 32,670.74 |
-11 | 262.15 | 30,839.07 |
-10 | 263.15 | 29,122.86 |
-9 | 264.15 | 27,514.08 |
-8 | 265.15 | 26,005.32 |
-7 | 266.15 | 24,589.71 |
-6 | 267.15 | 23,260.90 |
-5 | 268.15 | 22,013.02 |
-4 | 269.15 | 20,840.63 |
-3 | 270.15 | 19,738.67 |
-2 | 271.15 | 18,702.47 |
-1 | 272.15 | 17,727.69 |
0 | 273.15 | 16,810.30 |
1 | 274.15 | 15,946.57 |
2 | 275.15 | 15,133.02 |
3 | 276.15 | 14,366.42 |
4 | 277.15 | 13,643.77 |
5 | 278.15 | 12,962.28 |
6 | 279.15 | 12,319.35 |
7 | 280.15 | 11,712.57 |
8 | 281.15 | 11,139.67 |
9 | 282.15 | 10,598.56 |
10 | 283.15 | 10,087.29 |
11 | 284.15 | 9,604.02 |
12 | 285.15 | 9,147.05 |
13 | 286.15 | 8,714.79 |
14 | 287.15 | 8,305.76 |
15 | 288.15 | 7,918.57 |
16 | 289.15 | 7,551.93 |
17 | 290.15 | 7,204.61 |
18 | 291.15 | 6,875.49 |
19 | 292.15 | 6,563.51 |
20 | 293.15 | 6,267.66 |
21 | 294.15 | 5,987.03 |
22 | 295.15 | 5,720.74 |
23 | 296.15 | 5,467.98 |
24 | 297.15 | 5,227.97 |
25 | 298.15 | 5,000.00 |
26 | 299.15 | 4,783.40 |
27 | 300.15 | 4,577.53 |
28 | 301.15 | 4,381.80 |
29 | 302.15 | 4,195.66 |
30 | 303.15 | 4,018.57 |
31 | 304.15 | 3,850.05 |
32 | 305.15 | 3,689.63 |
33 | 306.15 | 3,536.88 |
34 | 307.15 | 3,391.39 |
35 | 308.15 | 3,252.77 |
36 | 309.15 | 3,120.65 |
37 | 310.15 | 2,994.71 |
38 | 311.15 | 2,874.60 |
39 | 312.15 | 2,760.04 |
40 | 313.15 | 2,650.73 |
41 | 314.15 | 2,546.41 |
42 | 315.15 | 2,446.81 |
43 | 316.15 | 2,351.71 |
44 | 317.15 | 2,260.86 |
45 | 318.15 | 2,174.07 |
46 | 319.15 | 2,091.12 |
47 | 320.15 | 2,011.82 |
48 | 321.15 | 1,936.00 |
49 | 322.15 | 1,863.47 |
50 | 323.15 | 1,794.09 |
51 | 324.15 | 1,727.70 |
52 | 325.15 | 1,664.15 |
53 | 326.15 | 1,603.30 |
54 | 327.15 | 1,545.03 |
55 | 328.15 | 1,489.22 |
56 | 329.15 | 1,435.74 |
57 | 330.15 | 1,384.49 |
58 | 331.15 | 1,335.36 |
59 | 332.15 | 1,288.26 |
60 | 333.15 | 1,243.08 |
61 | 334.15 | 1,199.75 |
62 | 335.15 | 1,158.17 |
63 | 336.15 | 1,118.27 |
64 | 337.15 | 1,079.96 |
65 | 338.15 | 1,043.19 |
66 | 339.15 | 1,007.87 |
67 | 340.15 | 973.94 |
68 | 341.15 | 941.35 |
69 | 342.15 | 910.03 |
70 | 343.15 | 879.92 |
71 | 344.15 | 850.97 |
72 | 345.15 | 823.14 |
73 | 346.15 | 796.37 |
74 | 347.15 | 770.62 |
75 | 348.15 | 745.84 |
76 | 349.15 | 721.99 |
77 | 350.15 | 699.04 |
78 | 351.15 | 676.94 |
79 | 352.15 | 655.66 |
80 | 353.15 | 635.16 |
81 | 354.15 | 615.41 |
82 | 355.15 | 596.39 |
83 | 356.15 | 578.05 |
84 | 357.15 | 560.38 |
85 | 358.15 | 543.34 |
86 | 359.15 | 526.90 |
87 | 360.15 | 511.06 |
I changed the 2 pin plug and bought a new temperature sensor, after 35 km the same issue reappear, I measured the resistance and found it between 1.5 kOhms and 2 kOhms.
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The car should reach full temperature well before you travel 35 km. My car reaches full temperature after 2 to 3 km. Once it reaches about 90˚C the thermostat opens. If the your temperature reading keeps rising I suspect the thermostat is jamming or something else is wrong with the cooling system. One thing you could do is check if the heater is blowing hot air.
When you measured 6.02 K Ohms what were you measuring? You should not be measuring the ECU.
When you measured 6.02 K Ohms what were you measuring? You should not be measuring the ECU.
Because the thermostat is removed the temperature stays always 60˚C. I measured the resistance on the temperature sensor while showing the STOP; not the ECU.
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