Code 15, or 16
Thread Starter
Supreme Member
Joined: Dec 2005
Posts: 1,244
Likes: 1
From: Texas City, Texas Area
Car: 89 RS, 92 Z28
Engine: 305 TBI, 350 TPI
Transmission: 700R4 Both Cars
Axle/Gears: 3.23 Posi.. 4 wheel disc both cars
Code 15, or 16
All of a sudden my SES light came on (Never has since i've owned the car) When I stop the car idles rough at times, and may or may not die..The idle is a bit erratic....Going down the road it is fine...The light will go off sometimes, and other time glow dimly..I bought a code reader deal, and to the best of my ability..I count it to be a 15, or a 16 error......About 2 weeks ago, I disconnected the Air pump, and blocked off all the lines on the manifolds...Just put new Accel coil, cap, rotor, wires, and dizzy.....Plugs are good to the best of my knowledge.....Autozone people told me thet thought it was the oxygen sensor....I did'nt read a fault for that, BUT im new to code reading......The car starts fine in the morning, but as soon as it warms up, I have this problem, can ANYONE PLEASE help me with this????????? It is not fun to drive right now, and I just got my new rear end in, and my shift kit, so I would like to enjoy the ride....Could this have anything to do with the smog pump, or maybe the Cat Converter????? IDEA's?????????? Thanks alot, Tom
Moderator
Joined: Jan 2000
Posts: 19,655
Likes: 309
Which code (or both)?
Either could be a problem, and if either one is set, the ECM may be operating in Backup Fuel and Spark Mode.
15 - Coolant sensor - low temperature fault
16 - System over voltage - over 17.1 volts
If the coolant temperature sensor circuit is open, or the sensor has failed in an open-circuit mode, the ECM will interpret that as -40º coolant temperature. While that IS possible, it isn't nearly as likely in Texas as around here. When this occurs, the ECM will enrich the fuel mixture and provide almost no ignition timing advance.
Verify the error code, and resolve the problem.
Either could be a problem, and if either one is set, the ECM may be operating in Backup Fuel and Spark Mode.
15 - Coolant sensor - low temperature fault
16 - System over voltage - over 17.1 volts
If the coolant temperature sensor circuit is open, or the sensor has failed in an open-circuit mode, the ECM will interpret that as -40º coolant temperature. While that IS possible, it isn't nearly as likely in Texas as around here. When this occurs, the ECM will enrich the fuel mixture and provide almost no ignition timing advance.
Verify the error code, and resolve the problem.
Thread Starter
Supreme Member
Joined: Dec 2005
Posts: 1,244
Likes: 1
From: Texas City, Texas Area
Car: 89 RS, 92 Z28
Engine: 305 TBI, 350 TPI
Transmission: 700R4 Both Cars
Axle/Gears: 3.23 Posi.. 4 wheel disc both cars
I know the voltage isnt over, cuz I have a digital volt meter in the back of the car.....Could be the 15 code tho...My main trouble is reading the codes.....Well thanks for the reply....Tom
Thread
Thread Starter
Forum
Replies
Last Post