What resets the computer after the codes are cleared?

Asked by Apr 28, 2016 at 12:55 PM about the 2012 Jeep Compass

Question type: Maintenance & Repair

Have driven over 300 miles after the codes were cleared and still get a not
ready message on two parameters.

3 Answers

12,625

After codes are cleared that's it the computer will "relearn" or optimize the fuel map and timing when in closed loop after driving. what code(s) or parameters are messaging NOT ready?

don't know that answer- I've had it to the dealer and a service center several times and I'm told we can't do a state inspection because of the not ready message. One place told me to drive at 70 MPH with half a tank for 30 minutes. The dealer said it is "key cycles" that matter but didn't know how many. Help!

12,625

Now I know its an emission system issue, for state certification:1. O2 SENSOR HEATER 2. CATALYST 3. O2 SENSOR 4. EVAPORATIVE SYSTEM all which are "not completed" Key cycles will not help this! Its not going into what is referred to as closed loop. The dealer should know this after servicing so many jeeps, its called "pattern recognition" they Jeep Compasse's have the same issues. Check these items 1.O2 FUSE 15amp in power distribution box its under the hood. 2. Electrical harness that connects to the UPstream 02 HEGO (heated exhaust gas oxygen) sensor(s) is it connected? is it worn or frayed? insulation gone from wiring? ~~~ HERE'S the drill i use for this I use the FACTORY scan tool: P0135-O2 SENSOR 1/1 HEATER PERFORMANCE When Monitored: Engine running and heater duty cycle greater than 0%. ASD Relay is energized. Battery voltage greater than 10.4 volts. Set Condition: No sensor output is received when the PCM powers up the sensor heater. O2 heater is out of control for 128 seconds after it has reached 300 deg C. Two trip fault P0141-O2 SENSOR 1/2 HEATER PERFORMANCE When Monitored: Engine running and heater duty cycle greater than 0%. ASD Relay is energized. Battery voltage greater than 10.4 volts. Set Condition: No sensor output is received when the PCM powers up the sensor heater. O2 heater is out of control for 128 seconds after it has reached 350 deg C. Two trip fault. P0155-O2 SENSOR 2/1 HEATER PERFORMANCE When Monitored: Engine running and heater duty cycle greater than 0%. ASD Relay is energized. Battery voltage greater than 10.4 volts. Set Condition: No sensor output is received when the PCM powers up the sensor heater. O2 heater is out of control for 128 seconds after it has reached 300 deg C. Two trip fault. P0161-O2 SENSOR 2/2 HEATER PERFORMANCE When Monitored: Engine running and heater duty cycle greater than 0%. ASD Relay is energized. Battery voltage greater than 10.4 volts. Set Condition: No sensor output is received when the PCM powers up the sensor heater. O2 heater is out of control for 128 seconds after it has reached 350 deg C. Two trip fault. POSSIBLE CAUSES O2 SENSOR HEATER OPERATION O2 HEATER ELEMENT O2 HEATER CONTROL CIRCUIT OPEN O2 HEATER GROUND CIRCUIT OPEN 1 Turn the ignition off. NOTE: Wait a minimum of 8 minutes to allow the O2 Sensor to cool down before continuing the test. Allow the O2 Sensor voltage to stabilize between 4.6 and 5.0 volts. Ignition on, engine not running. With the DRBIIIt, actuate the O2 Heater Test. With the DRBIIIt, monitor O2 Sensor voltage for at least 2 minutes. Does the voltage stay above 4.5 volts? Yes ! Go To 2 No ! Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). 2 Turn the ignition off. NOTE: Allow the O2 Sensor to cool down to room temperature. Disconnect the O2 Sensor harness connector. Measure the resistance across the O2 Sensor Heater element component side. Is the resistance between 2.0 and 30 ohms? Yes ! Go To 3 No ! Replace the O2 Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 5. 3 Disconnect the PCM harness connectors. Measure the resistance of the O2 Heater Control circuit from the O2 Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 0.5 of an ohm? Yes ! Go To 4 No ! Repair the excessive resistance in the O2 Heater Control circuit. 4 Measure the resistance between an engine ground and the O2 Heater ground circuit at the O2 Sensor harness connector. Is the resistance below 0.5 of an ohm? Yes ! Go To 5 No ! Repair the excessive resistance in the O2 Heater ground circuit. 5 NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. If there are no possible causes remaining, view repair. Repair PCM

1 of 1 people found this helpful.
Best Answer

Your Answer

Add photo

Related Questions

Compass

Looking for a Used Compass in your area?

CarGurus has 30,225 nationwide Compass listings starting at $2,000.

ZIP:

Search Jeep Compass Questions

Jeep Compass Experts

#1 Tom Demyan
Tom Demyan
Reputation 120
#2 F_O_R
F_O_R
Reputation 70
#2 puregold5
puregold5
Reputation 70
View All

Related Models For Sale

Used Jeep Grand Cherokee
1,080 Great Deals out of 73,498 listings starting at $1,200
Used Jeep Patriot
386 Great Deals out of 18,012 listings starting at $2,250
Used Jeep Liberty
229 Great Deals out of 7,314 listings starting at $300
Used Jeep Wrangler
267 Great Deals out of 15,899 listings starting at $3,200
Used Ford Escape
1,333 Great Deals out of 85,025 listings starting at $950
Used Honda CR-V
992 Great Deals out of 57,336 listings starting at $1,000
Used Jeep Wrangler Unlimited
277 Great Deals out of 40,763 listings starting at $9,500
Used Chevrolet Equinox
1,039 Great Deals out of 88,829 listings starting at $1,995
Used Toyota RAV4
906 Great Deals out of 64,717 listings starting at $1,990
Used Nissan Rogue
561 Great Deals out of 66,577 listings starting at $1,900
Used Ford Edge
815 Great Deals out of 47,908 listings starting at $2,990
Used Mazda CX-5
223 Great Deals out of 28,327 listings starting at $7,490

Used Cars For Sale

2017 Jeep Compass For Sale
29 Great Deals out of 19,460 listings starting at $12,999
2016 Jeep Compass For Sale
121 Great Deals out of 3,250 listings starting at $9,998
2015 Jeep Compass For Sale
12 Great Deals out of 866 listings starting at $9,591
2014 Jeep Compass For Sale
73 Great Deals out of 2,007 listings starting at $7,990
2013 Jeep Compass For Sale
11 Great Deals out of 277 listings starting at $7,990

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.