godlymen

92 accord 5 speed manual Lx model . Have a Cel 7 . the TPS red wire reads (point 493) .493 at closed throttle with key on . the TPS reads 4.56 ( 4 point 56) with open throttle, key on), the yellow to green wire with key on reads 5.06 ( 5 point 06). What would be the next thing to check? Or what group of things would be next to check in this cel 7 circuit? Thx in advance.

MAD_MIKE

Verify the pins are not loose or corroded.
Verify the harness is not damaged or modified.
Verify the harness ground is not damaged, corroded or loose(mounted on the thermostat housing bolt).

holmesnmanny

You need to test for continuity from the tps connector going back to the ecu on the signal wire, back to the ecu connector at the ecu. There must be an open. It's possible the tps connector itself is corroded so take a close look at it like mike said. Pull gently on the wires to see if they are loose. If everything checks out ok then pull the ecu itself and open it up and look for burned spots inside.

http://technet.ff-squad.com/wiring.obd1.htm

godlymen

Thx for the help to everyone who replied. I un hooked the battery before cleaning. I cleaned and re plugged connections on the TPS and the connections around the Thermostat. I have made 2 trips to town with a few starts and stops and the cel 7 has not returned. I will monitor this and see if it returns after a few more trips .

holmesnmanny

It's possible the connector was not plugged in all the way. You may want to see if the connector is dirty.

godlymen

Update- It has taken a while to do some testing but I made a few trips to town and the code 7 returned. I was not able to locate a ground wire attached to the thermostat housing bolt. There is a plug in on the thermostat housing that i checked for tightness and clean. When I drive the car It seems to set the code after it suffers hesitation at around 50 mph it feels like it looses power , the engine doesn't die, but after a few seconds the power is back, then it sets the code 7. I re tested the TPS and at idle had 0.48 v, I slowly rotated the shaft and watched the v go up steady all the way to 4.55 v at wide open throttle. I tried tapping on the TPS as I turned it watching for any dead spots and saw nothing. It was a steady up and down reading without any dead spots , that I noticed. I tried this 3 or 4 times to make sure. The connection on the tps feels tight and looks clean. ( I took all my v measurements using the green wire for ground on the tps harness.) I tried to locate the wire going back to the ECU but so far have not located the wire at the ECU. It was so difficult to get to I went to pick and pull to practice on there car. I broke one plastic harness trying to unplug it from the ECU . A small mirror would help locate the release. I was able to remove the ECU at pic and pull but out of the 5 wire harnesses with around 20 wires each ,still didn't locate the green wire. I mention this incase from the above info it changes the game plan to locate the problem.

holmesnmanny

If the tps is testing good and all the wiring is checking out it's likely the ecu is bad. You would need either a 92-93 ecu from the same trim from the junkyard.

godlymen

Thx for the reply. I will try looking closer at the ECU .

godlymen

I noticed a lot of oil around the distributor while looking at wiring and decided to pull the distributor and change the oil seals. Upon removing the distributor cap the coil wire was burnt in half, not visible under the rubber boot, but it had burnt a hole into the distributor cap . I pulled the cap and the ignition module on the inside looked like it had been hot as i could see inside the igniter through a hole . I had noticed last time I passed smog the average numbers were high but passed just 2 or 3 points below the limit. I think this might be my problem, as what other code would be set for this besides a 7or the TPS. Also this code 7 would disappear then return , which seems like it could be a bad coil wire getting a better connection at times. .

MAD_MIKE

If your harness ground connection is missing at the thermostat housing then the voltage will try and fine another path.

godlymen

Thanks again for all comments and help. Was there any other location the factory ever used to ground besides the thermostat bolt? I have looked for that ground 2 or 3 times now thinking it must of been left off when someone changed the thermostat or something but have not been able to find a wire in the area that's hanging loose. I don't see any evidence of wires cut and taped or anything around the thermostat bolt. After putting the car back together with a new distributor the cel 7 has been gone. I have made enough trips to town to know its off for now. I will check more for that ground , I have masked off parts i didn't want wet and washed the area with engine cleaner 3 times also to remove any oil and dirt from the distributor leaking also.

godlymen

Thx again for the photo and help. I found the bolt for the ground on the housing on the bottom of the thermostat. I had to pull the air filter and rubber intake manifold to get enough clearance to find it. It was all clean and tight had 2 wires under the bolt head. I assume from the picture it's the one on the left in photo with only 2 wires.

godlymen

The one on the right with 7 wires is that also there somewhere or are they just showing 2 different ground possibilities?