As some of you know, I was in an unfortunate accident and insurance is being really slow and shady right now, so I'm probably going to end up doing much of the rebuild myself. I have some electrical problems that need to be straightened out before I can do much more, though.

Here is the CEL data from today:

CEL codes:
20 - Electrical Load Detector
41 - Primary O2 Sensor
65 - Secondary O2 Sensor
70 - Automatic Transmission problem

D4 A/T codes:
1 - Lock-up control solenoid valve A
16 - Linear Solenoid

I cleared the codes and checked them again. Code 1 did not recur.

• The primary O2 sensor is damaged, so that's a pretty clear code. The secondary O2 sensor appears undamaged, however, which makes me wonder.

• I ran through the troubleshooting flow charts on pages 14-80 and 14-81 of the service manual for the A/T code 1 anyways, and it indicated that there is an open in the wires between the B20 and B22 terminals and the ground (G101). I need to know where these wires go so I can trace them and find the damaged section.

• I ran through the flow charts on page 14-97 for the A/T code 16 and found that there was an open or short between the D5 terminal and the under-dash fuse/relay box. Where all does the wire from the D5 terminal go, between the ECU and the under dash fuse box?

• I tried to start troubleshooting for the Electrical Load Detector, but did not know where the C254 connector was. (I also could not turn on the headlights due to the wreck to put a load on the engine.) There is a 3 pin connector hanging loose behind the under dash fuse box, though, and I do not know what it is from or where it goes. It only had two wires. Where is the C354 ELD connector?

• As a side note, I did find that the 7.5 amp Fuse 15 was blown. I replaced it, but all CEL codes recurred. (I'll need to remember to replace the blown fuse on the rear defroster circuit.)
• My idle is somewhat erratic at times, but I assume this is due to the distributor cap missing a chunk out of it. There is no CEL for misfire or idle.

 

Did the new fuse blow? This sounds like classic fuse 15, that circuit goes down, you lose power to a bunch of sensors and solenoids and get codes. You should unplug the damaged O2 sensor, likely it's shorted and blowing the fuse.

Also I wouldn't worry about an ELD code at all yet, they are often spurious. Or fuse 15 related.

 

The new fuse did not blow.

I was able to clear all of the codes except the obviously damaged primary O2 sensor. As it turns out, the #2 plug wire was actually cut and intermittently grounded to that shiny new valve cover bolt. I found this out when I touched it and happened to be grounded to the fender...

Troubleshooting FTW.

 

Guys... What is this connector for? (The loose white one with the blue and brown wires)