73 Volvo TPS

I am trying to replace the TPS for my 73 Volvo 1800ES with a 5-pin Bosch # 280 120 047. Is this TPS compatible with the 73 Volvo?

The original Volvo TPS is a 4 pin, no WOT. According to the wiring schema on the 047 TPS, the pin arrangement from top to bottom is
9, 20, 12 (WOT not used), 17, 14.   

Comparing this to a known working 4-pin TPS (not a 047) installed in another ES, the pin arrangement is 9, 20, 14, 17.   

I have installed the 047 TPS according to the schema indicated on the TPS, but I do not get continuity between pins 17 and 14 when I test with my meter. I do not heart any clicks either. Is it possible that the pin arrangement is wrong, and should actually be 9, 20, 14, 17? Should I switch wires 14 and 17, and will this cause any damage?  

Thanks
Mitch
 

On the 047 TPS, which pin controls WOT? Is it 12, or 14?

Hi Mitch,

excuse me what is WOT?

WOT = wide open throttle (full open)

Hi Mitch,
maybe the 047 doesn't fit at all because it is noticed to be a 'Bendix' type, correct right-turning, almost compatible with a Mercedes type 015 (which is a 5-poled compatible with the 4-poled 026 and the 39 that would fit your car) but with a different mounting direction.
Maybe it won't fit because the idle-switch-position isn't reached at all when you try to adjust the unit.
You have to try this out at first...
Install the switch and turn it to left. You should feel some resistance than. Is it adjustable in this position?
Else it isn't useable at all because it doesn't fit mechanically.

You have to know the Pins 14 and 12 are both 'ground'='earth'.
Pin 2 is the contact you call 'WOT'. But this is incorrect - the contact switches at 2/3 open throttle or 3/4 open throttle - depending on the car model <and sometimes model year>. But you don't need it, that's good - you don't have to care about this.

But try at first what I wrote above.
Then we can think about the wiring. You can't damage anything.
It's only the 'ground' that is switched towards the other contacts in this unit.

Regards
Norbert





 

I am going to try to move the wire at pin 14 to the position for 12. This will result in the arrangement 9, 20, 14, 17, and leaving the last pin without a wire. This will then correspond to the arrangement on the original TPS that is on the other Volvo ES.

If this change doesn't work then I will probably have to find a good working 039 unit.

Thanks