Hey guys,

just wondering how long it typically takes for SES codes to appear after pulling the PCM BATT fuse from inside the car? Just wondering because i had code P0160 before i fixed the harness and pulled the PCM BATT fuse. Just wondering!

thanks

 

they will only apper if the problem is still there other than that they will be hard codes that won't keep the light on but it will be in the memory until 40 drive cycles with no more faults....

 

so how do i tell if its still there?

should i drive it around more?

This sucks.... seriously haha stupid rear o2 sensors!

would an OBD2 code scanner pick up these codes?

thanks

 

theres no way to tell if it's there unless the lights on or if you have a scanner that has the capabilitys of reading pcm memory (snap on scanners can do so) also autozones scanners can set and tell you if your readiness is set.. the operator has to know how to use the scanner or they will tell you it's not possible.. but other than that you just have to go through gm's drive cycles which suck if you ask me look below...... straight off of Gm's web site...

Performing a GM OBD-II Driving cycle:

Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 122°F (50°C) and within 11°F (6°C) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.

Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.

Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 55mph (88km/hr) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.

Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.

Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 20 mph (32km/hr). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.

Accelerate. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.

Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.

Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.