00323

so i had code 6 on from a bad Distributor and replaced it with a NEW one and still have CEL on...ive tried disconnecting the battery for a while...pulled the ECU fuse..pulled the hazard fuse and even tried disconnecting the ECU...nothing still have CEL...any help? maybe im doing something wrong.

MD426

If you reset the ECU and the CEL immediately comes back on with the new distributor then it's probably a bad connection in the connector or wiring harness for the distributor.

seanbev24

This sounded strange to me so I googled obd0 codes and clicked on 5 links...

1 link (g2ic teg tips) said code 6 is crank sensor (dizzy)
The rest of them said code 6 is ECT (coolant temp)

Then I got off my lazy *** and grabbed a haynes manual from the garage. It also says ECT.

MD426

He's right, since yours is a '90 it's OBD0, I also saw ECT, Engine Coolant Temperature. I'm guessing that it comes on when you overheat. Can you verify that? Let the car idle for ~15 mins or take a drive, does the coolant temperature get passed the middle on the gauge?

seanbev24

To check the ECT:

-Get the engine to full operating temp (t-stat open, fan cycles on a couple times)
-Turn off car
-Unplug ECT
-Use an ohmmeter and measure the resistance between the 2 terminals on the sensor.
-If resistance isn't between 200-400 ohms, the sensor is bad.

To check the circuit wiring:

-With the sensor still unplugged, turn the key to ON but don't start the car.
-Measure the voltage between the terminals in the plug on the HARNESS side.
-There should be 5 volts.
-If not 5 volts, there's a problem in the circuit wiring or the PCM itself.

00323

thanks got a new sensor and CEL came off..new problem now...after driving 10-15 minuets CEL turns on... i pulled over to read the code but nothing...so drove off and 5 mins later came on...read it while the car was on and still code6..no CEL on startup or anyhthing..comes on after a while driving but then turns of when i turn off the car...any helP?

MD426

It will come on when there is a problem, it wont stay on. Your overheating for some reason. The ECU should store the last 3 codes before it's reset though. I would flush your cooling system, air bubbles in the coolant system can cause over heating too.

00323

the temp needle is always in the normal operating temperature..right in the middle...i just did a coolant flush a month ago..

MD426

There can still be air bubbles in the lines. I'm pretty sure the ECT sensor acts like the oil pressure sensor, it comes on when there is a problem then goes out when it's fine. The sensor is getting hot from somewhere or is shorting out.

00323

its a new sensor....how can i fix this? or how can i get the air bubbles out..but if it was overheating then why is the temp needle fine?

00323

bump

00323

ttt

00323

ok so i got my bros multimeter and got 5V out the harness plug...then measured the resistance on the sensor and got a little over 200....so reset the ECU twice still getting CEL while driving

fcm

Check your 02 sensor (s), a CEL coming on when driving is an indication that there is a problem with one of the engines emission control systems.94

00323

its showing up as code 6 when it comes on....after a couple mins of driving it comes on and ive pulled over while the car was still running and showed code 6 witch is ECT...its a new sensor ive check the voltage and the ohms and everything is fine

seanbev24

FCM- Would the ECT not be considered an emission control? I figure it is since the ecu needs to see the right temp to run closed loop?

It seems to me if 5 volts is getting to the sensor and the sensor is new, the only part of the circuit that could be bad is the ECU.

I know air bubbles can do strange things, but I would think if that were the issue, there'd be other problems with overheating, sending unit, heater temp, iacv, etc.

00323

no overheating temp stays at normal operating range...ill switch out the ECU and see how that goes

fcm

The ECT sensor is part of the emission control and I understand that he is still getting the code 6, but taking into account that the ECTS is new, voltage is good, impedance is within range, overheating is not an issue, I am assuming that the sensor is not the issue, nor is coolant, [low or bubbles in it] so it must be something else and a CEL when driving is most commonly caused by a problem with the 02 sensor.

I do agree that it can also be a problem with the ecu/ecm, mainly because of the code 6 still showing up, it does make sense, ECTS is good but still getting code.

I would ask, is the code being cleared properly? 94

00323

yes i properly reset the ECU a couple times already

boondocksaint3c

I have the exact same problem on the 91 i just bought... :/

Gonna replace the o2 n see what happens