Strange ECU error code - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

geeaj · 12-20-2001, 10:25 PM

My 89 s13 is having a problem with the check engine light. It came on after I replaced the alternator and put in a new battery.

I pulled the ecu and read the code, it returned code 55. So I figured this was some sort of a once in a blue moon occurance. Having said that, I reset the ECU. The light cleared.

I drove it for a day and the light came back on several hours later. The car is running great (as great as can be for a 175K car =P). I didn't notice any changes in performance, although my mileage seems to be degrading. I have used up a quarter tank and only show 80miles elapsed on the gauge.

I've recently changed the following:

spark plug wires
basic tune up, includes air filter, crackcase filter, oil filter, fuel filter
MAF
head temperature sensor
coolant temperature sensor
water pump
thermostat
oxygen sensor
alternator
battery

What do you think could be causing this problem? Bad engine/chassis ground? Bad ecu? I mean, the car runs fine but hate that #### light!

Any help would be appreciated...

12-20-2001, 10:25 PM	#1
geeaj Zilvia Junkie Join Date: Dec 2001 Posts: 357 Trader Rating: (0) Feedback Score: 0 reviews	My 89 s13 is having a problem with the check engine light. It came on after I replaced the alternator and put in a new battery. I pulled the ecu and read the code, it returned code 55. So I figured this was some sort of a once in a blue moon occurance. Having said that, I reset the ECU. The light cleared. I drove it for a day and the light came back on several hours later. The car is running great (as great as can be for a 175K car =P). I didn't notice any changes in performance, although my mileage seems to be degrading. I have used up a quarter tank and only show 80miles elapsed on the gauge. I've recently changed the following: spark plug wires basic tune up, includes air filter, crackcase filter, oil filter, fuel filter MAF head temperature sensor coolant temperature sensor water pump thermostat oxygen sensor alternator battery What do you think could be causing this problem? Bad engine/chassis ground? Bad ecu? I mean, the car runs fine but hate that #### light! Any help would be appreciated...