87 Turbo 5 spd JDM 7M with JDM auto ecu.
Car ran great right after swap, and for about 3 weeks after. then it popped the CEL. Code 51 and 52. I have already rewired the knock sensors prior to installing engine.
I am fighting with both of these codes and I am now losing the battle.
Code 51 is there from the time the engine is started. If i clear the ECU by the fuse or batt disconnect, I can start the car just fine. as long as I don't rev it, the CEL will remain off. I can check the codes while the light is off and it shows 51. I have replaced and adjusted the TPS with a known working unit. When I rev the engine, say about 3k ish, it'll pop the light on and code 52 is there. I checked the rewire, no cont. to ground on either wire. less than 30mv at the ground for the KS wire. I replaced the knock sensors last night with 2 known working ones I had laying around. The cel popped on soon as I revved it, code 52.
Now the wierd part; I got fed up with the car and decided to drive it home from the shop with 52 still present. So I backed the car out of the shop, turned it off, then restarted it. I let it idle to warm it up while I was locking up. ran for about 5-7 minutes. I get in the car to go home, and the whole ride there, the light never came on! The ride was about 10 minutes and I was laying into the throttle pretty heavy just to see when/ if the light would flash up. After stopping inn at wal mart for milk, I came back to the car started it and drove the rest of the way home. Before I could get out of the parking lot the light came back on.
This morning I checked the codes again, 51 and 52. cleared codes for the hell of it, took my kids to school. light popped soon as i hit 3k rpm. when I left the school the light stayed off for about 10 minutes until I pulled into Wawa for my coffe. On the way home the light was back on......... WTF
So that is the whole story, a bit lengthy, but I want to make sure I have all the details straight.
I spent the better part of yesterday searching the code 52 threads and found all the typical " rewire it" or "replace it" threads. Not too much on this type situation.
I've got 2 options to try for the 52 code:
I just ordered 2 new KS connector from yota, they will be in tomorrow morning. So I can do another rewire. I know repitition is stupid but hey.
I am also thinking of putting my USDM 5spd ECU in the car and see what happens. I am not sure if the pinouts are different between the JDM A/T and the USDM 5spd. I do not have EGR so I know that will throw a code, I just want to make sure if I plug the US ecu in i'm going to have all the pins going to the right wires.
Thanks to all for wasting your day reading that novel. Any input is greatly appreaciated.
Car ran great right after swap, and for about 3 weeks after. then it popped the CEL. Code 51 and 52. I have already rewired the knock sensors prior to installing engine.
I am fighting with both of these codes and I am now losing the battle.
Code 51 is there from the time the engine is started. If i clear the ECU by the fuse or batt disconnect, I can start the car just fine. as long as I don't rev it, the CEL will remain off. I can check the codes while the light is off and it shows 51. I have replaced and adjusted the TPS with a known working unit. When I rev the engine, say about 3k ish, it'll pop the light on and code 52 is there. I checked the rewire, no cont. to ground on either wire. less than 30mv at the ground for the KS wire. I replaced the knock sensors last night with 2 known working ones I had laying around. The cel popped on soon as I revved it, code 52.
Now the wierd part; I got fed up with the car and decided to drive it home from the shop with 52 still present. So I backed the car out of the shop, turned it off, then restarted it. I let it idle to warm it up while I was locking up. ran for about 5-7 minutes. I get in the car to go home, and the whole ride there, the light never came on! The ride was about 10 minutes and I was laying into the throttle pretty heavy just to see when/ if the light would flash up. After stopping inn at wal mart for milk, I came back to the car started it and drove the rest of the way home. Before I could get out of the parking lot the light came back on.
This morning I checked the codes again, 51 and 52. cleared codes for the hell of it, took my kids to school. light popped soon as i hit 3k rpm. when I left the school the light stayed off for about 10 minutes until I pulled into Wawa for my coffe. On the way home the light was back on......... WTF
So that is the whole story, a bit lengthy, but I want to make sure I have all the details straight.
I spent the better part of yesterday searching the code 52 threads and found all the typical " rewire it" or "replace it" threads. Not too much on this type situation.
I've got 2 options to try for the 52 code:
I just ordered 2 new KS connector from yota, they will be in tomorrow morning. So I can do another rewire. I know repitition is stupid but hey.
I am also thinking of putting my USDM 5spd ECU in the car and see what happens. I am not sure if the pinouts are different between the JDM A/T and the USDM 5spd. I do not have EGR so I know that will throw a code, I just want to make sure if I plug the US ecu in i'm going to have all the pins going to the right wires.
Thanks to all for wasting your day reading that novel. Any input is greatly appreaciated.
