2001 S40 Turbo blown Fuse Topic is solved

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1996 - 2004 V40

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Volvoblackdog
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2001 S40 Turbo blown Fuse

Post by Volvoblackdog »

I have a fuse that is blown on the Sensor section of the engine fuse box. Using a test light I am not getting power to either side of the fuse which leads me to believe that the relay is stuck open? :idea: I do not have access to wiring diagram good enough to show where the wires go from the fuse box to trace the short. Any help would be appreciated. Thanks :D

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RickHaleParker
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Post by RickHaleParker »

The document you are looking for is Volvo publication TP3949202.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

Volvoblackdog
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Post by Volvoblackdog »

Thanks, I will take a look. I have been looking at Chilton on line. Has anything having good luck with that.

Volvoblackdog
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Post by Volvoblackdog »

Okay I am still having an issue with this above problem. I have a wiring diagram now and have tested all the sensors that this fuse goes to and all seem to be fine. However, I would like to trace the short if there is one but I am not able to as the relay shuts down after I turn the key on and the relay provides power. After about two seconds the relay opens and power is shut down. I bench tested the relay and it seems fine. I am new to relays so I may not have tested it correctly. Any other ideas would be greatly appreciated.

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RickHaleParker
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Post by RickHaleParker »

Here is an idea: Tell us which relay and which fuse ...component numbers and which document you are using.
We are good but we are not Telepathic.

For short tracing there are tools for tracing shorts and opens in a loom. The kit consist of a transmitter and a receiver. You connect the transmitter to the wire then run the receiver along the loom until the receiver detect the location of the short or open.

You can also use the kit to trace the path of a wire without opening the loom.

The kits range in price from ~$25.00 to $200.00+ .

Here is an example in eBay.
Image
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

Volvoblackdog
Posts: 21
Joined: Mon Aug 10, 2020 10:50 pm
Year and Model: 2001 Volvo S40
Location: Nevada
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Post by Volvoblackdog »

I decided to try another relay in the slot for the sensor relay and found that even though the relay was working and showed at least 78 Ohms on the control side and a battery test closed the circuit. I tested the Ohms on the power side and there was no resistance but the terminals seem loose. I tried another relay and the car starts up, runs and now does not blow the fuse. I guess it was the relay even though it tested okay.

For those of you that have been following. I traced the blown fuse as follows. Battery to Fuse 11 wired to relay marked Engine Sensors in the Engine fuse box. Power out to a 10 Amp fuse number 18 , (this is the fuse that was blowing) Using a circuit breaker fuse, I was able to find that the relay was perhaps shorting the system and not allowing the sensor circuit to stay on and thus the the car would not idle.

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