I am going to try de-soldering the plug and inspecting the board but was wondering if someone had the pin out and possibly a view of the back of the board and how to get those brass rivets? off?
here are some pics of it
I have been looking through all sorts of manuals and online references but nothing shows the pinout much less a schematic as to what is going on on the other side of the board … I will be volt metering it out to figure out what goes where but not tonight.
update 1:
this is an auto trans sensor, (Part Number: 30683511), and the manual trans sensor pedal part number is different, (Part Number: 30683510 Supersession(s): 30666651), but that may be because the shape of the pedal to fit 3 in the foot well and not have any difference on the board pictured above.
here is a list of cars this sensor plus the accelerator pedal was used in according to parts.volvocars.com:
Volvo C70 2.3l 5 cylinder Turbo Convertible
1998, 1999, 2000, 2001, 2002, 2003, 2004
Volvo C70 2.3l 5 cylinder Turbo Coupe
1998, 1999, 2000, 2001, 2002
Volvo C70 2.4l 5 cylinder Convertible
2000
Volvo C70 2.4l 5 cylinder Turbo Convertible
2000, 2001, 2002, 2003, 2004
Volvo C70 2.4l 5 cylinder Turbo Coupe
2000, 2001
Volvo C70 2.5l 5 cylinder Turbo Convertible
1998, 1999
Volvo C70 2.5l 5 cylinder Turbo Coupe
1998, 1999
Volvo S70 2.3l 5 cylinder Turbo
1998, 1999, 2000
Volvo S70 2.4l 5 cylinder
2000
Volvo S70 2.4l 5 cylinder Turbo
2000
Volvo S70 2.5l 5 cylinder
1999
Volvo S70 2.5l 5 cylinder Fuel Injected
1998
Volvo S70 2.5l 5 cylinder Turbo
1998, 1999
Volvo V70 2.3l 5 cylinder Turbo
1998, 1999, 2000
Volvo V70 2.4l 5 cylinder
2000
Volvo V70 2.4l 5 cylinder Turbo
2000
Volvo V70 2.5l 5 cylinder
1999
Volvo V70 2.5l 5 cylinder Fuel Injected
1998
Volvo V70 2.5l 5 cylinder Turbo
1998, 1999
Volvo V70 XC 2.4l 5 cylinder Turbo
2000
Volvo V70 XC 2.5l 5 cylinder Turbo
1998, 1999
please note the board might be used in many more cars as parts.volvocars.com only lists the entire happy-go-fast-lever with the sensor board not separated.
all that is mostly for reference
update 2:
outer 2 rails have a consistent resistance inner 2 rails have variable resistance
the top rail shows resistance around 1m+ ohms ish on pins 6 (at top of pic), 5, and 4
2nd from top rail shows resistance in the 0.5-2 ohm ish range on pins 6 and 4
3rd from top rail shows resistance in the 0.5-2 ohm ish range on pin 3
the bottom rail shows resistance around 1m+ ohms ish on pins 3 and 1
also just to clarify when the pedal portion of the module is attached or detached the circuit board sends the computer a signal showing 40% go pedal regardless of where the pedal is when attached or if it is missing. once the board is unplugged from the harness the accelerator pedal position drops to 0% on the scan tool.
update 3:
This gives a list of all the codes since Crunchycarrots79 on reddits volvo forum mentioned that usually it’s the TPS that goes belly up.
so there are 3 different states I have tested it in (just a note the TPS and APS might be flipped i cant remember from yesterday but 80% sure i got them right below I will check later today):
- plugged in pedal attached (scraper fingers scraping on the pads when pedal is pressed and released)
- This results in throttle body position sensor showing it opens from 8% fully off the gas to 87% when floored on the diag computer while accelerator position goes from 40.23ish % to 40.68ish % off gas and floored respectively
- during startup car revs to 4k for half a second or so cold or warm then settles at a slightly high idle
- plugged in without pedal attached (no connection between variable resistance pads so infinite resistance)
- TPS shows 0% and accelerator shows 40.23ish %
- during startup car revs to 4k for half a second or so cold or warm then settles at a slightly high idle
- unplugged (module disconnected from the car)
- TPS and APS show 0%
- during startup car revs to 1k for half a second or so cold or warm then settles to a normal idle
I am going to be testing a 4th state where I determine which resistance pad is which using a jumper as a scraper (i know one is redundant and that is why the car ecu realizes the discrepancy and then drives in reduced power mode after half a second of revving)
Once I get a pin out for that plug I am going to use a couple variable resistors to see if it IS that module that is bad or if there is something else going on (might be in the harness and when its an open short with infinite resistance the fault goes away).
the codes I am getting are (this is including unrelated codes because sometimes they are related bad grounds etc.):
- P1618 cable fault between AW 50-Q2 TCM and Motronic 4.4 ECM (lamp lights)
- 958F Accelerator Pedal Position Sensor, faulty signal <— this is why im digging into it
- 959FAccelerator Pedal Position Sensor, faulty signal <— and this
- 904D ETS warning lamp
- 530D diagnostic trouble code i another control module
- 720A immobilizer communication, faulty signal
- 002F lock up function, slipping or not engaged (has the gear 2/3 shift sluggishness problem with the 50-55sn trans, or perhaps this is part of limp mode?)
- 0093 control module communication
- 132 RPM signal. signal missing
- 521 central locking switch. signal too low
- 525 central locking switch, pass. signal too low
- 433 blower fan motor, current too high
update 4:
ok here is what happens with precise numbers https://photos.app.goo.gl/L23q75HhMTW52qFR6 there are notes next to each picture with the numbers telling what is on what is off what is plugged in and what is unplugged. it also has the readout for all the error codes too.
this is a text list of what is in the link:
- car on, engine off, module plugged in pedal attached wide open throttle
- accelerator pedal analogue input: 40.63%
- accelerator pedal pwm (via etm): 58%-72% (unstable but usually settled around 61% +/- 1%)
- car on, engine off, module plugged in pedal attached sitting idle
- accelerator pedal analogue input: 40.43%
- accelerator pedal pwm (via etm): 8.2%
- car on, engine off, module plugged in, accelerator pedal detached, jumper on resistor pads
- accelerator pedal analogue input: 40.43% (did not change no matter what happened with jumper)
- accelerator pedal pwm (via etm): 0% (did not change no matter what happened with jumper)
- car on, engine off, module plugged in, accelerator pedal detached, no jumper on resistor pads
- accelerator pedal analogue input: 40.92%
- accelerator pedal pwm (via etm): 0%
- car on, engine off, module unplugged
- accelerator pedal analogue input: 0.1%-0.2% (unstable would switch between these 2 values)
- accelerator pedal pwm (via etm): 0%
- car on, engine on, module plugged in, pedal attached idle
- Transmission control unit accelerator position reading: 0%
- car on, engine on, module plugged in, pedal attached WOT
- Transmission control unit accelerator position reading: 60%-65% (unstable but usually settled around 61% +/- 1%)
Thank you!