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Throttle position sensor.

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Bone Officially Full-On Dubber

299 posts · joined Aug 2009 ·

#964877
While blowing a few cob webs out of the Baja up the beach on the weekend, engine light started to come on and then go out for a while. Seems to stay on longer now several days latter. Engine- 92 ej22 error code 31. Do I just replace the throttle sensor and thats that or is there a voltage problem that sets it off? Will try a 2nd hand one I have here or shall I just get a newy straight up? Best mod to Baja= EJ22.

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 ·

#964888
Is it still driving and running normally?

When theres a fault with the TPS or wiring those gen1 ECUs will default bump the idle up to 1500rpm.

I broke one of the wires off mine many years back, it was still drivable but it had a nice flatspot on take off.

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 ·

#964891
Joel the engine seems fine with no change in idle. Most off the time the light is off! I will just watch it for a while.

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#964974
Bone wrote:Joel the engine seems fine with no change in idle. Most off the time the light is off! I will just watch it for a while.

most if not all TPS use 5v, Ground and a signal wire.

Check the 5v reference is indeed 5v and check the ground although depending of ECU maker it could be a virtual ground.

No easy way to check the signal line other than from the plug back to the ECU using a multi meter.

And of course I would try replacing the sensor first as that will be 95% change of the problem. Sound like its wearing out, I had one go once and no CEL came on, it was bad but still within rage that the ECU just compensated for it. it caused the idle to surge coming up to stops.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#964975
Joel wrote:Is it still driving and running normally?

When theres a fault with the TPS or wiring those gen1 ECUs will default bump the idle up to 1500rpm.

I broke one of the wires off mine many years back, it was still drivable but it had a nice flatspot on take off.
yep a flat spot cos there of lost AE function cos there is no reliable way of the ECU determining engine load.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 ·

#964997
Bone wrote:Joel the engine seems fine with no change in idle. Most off the time the light is off! I will just watch it for a while.
I'd say its a wiring issue rather than a sensor fault then.
Just one of the wire periodically breaking the circuit

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 ·

#965036
Joel wrote:
Bone wrote:Joel the engine seems fine with no change in idle. Most off the time the light is off! I will just watch it for a while.
I'd say its a wiring issue rather than a sensor fault then.
Just one of the wire periodically breaking the circuit
Will swap with the other first and take it from there.

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 ·

#965040
vlad01 wrote:
Bone wrote:Joel the engine seems fine with no change in idle. Most off the time the light is off! I will just watch it for a while.

it caused the idle to surge coming up to stops.
I have actually noticed a small surge when coming to stops. This has happened from day 1 of engine conversion. "Thought it was normal". swap to other TPS tomorrow arvo and see!

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 ·

#965127
Swapped TPS and bingo, Fixed!

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#965226
glad we could help.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE