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

11,725

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!

11,725

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 out of 1 people think this is helpful.
Best Answer

Your Answer

Add photo

Related Questions

Compass

Looking for a Used Compass in your area?

CarGurus has 1,202 nationwide Compass listings starting at $710.

Postal Code:

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
89 Great Deals out of 3,527 listings starting at $1,488
Used Jeep Patriot
66 Great Deals out of 2,246 listings starting at $2,400
Used Jeep Wrangler
107 Great Deals out of 1,408 listings starting at $3,989
Used Jeep Liberty
14 Great Deals out of 170 listings starting at $2,450
Used Ford Escape
191 Great Deals out of 4,382 listings starting at $428
Used Jeep Wrangler Unlimited
64 Great Deals out of 2,280 listings starting at $10,995
Used Honda CR-V
57 Great Deals out of 2,311 listings starting at $1,570
Used Chevrolet Equinox
86 Great Deals out of 4,387 listings starting at $977
Used Nissan Rogue
39 Great Deals out of 3,211 listings starting at $4,990
Used Toyota RAV4
112 Great Deals out of 3,260 listings starting at $2,995
Used Ford Edge
103 Great Deals out of 2,195 listings starting at $4,999
Used Nissan Murano
34 Great Deals out of 1,038 listings starting at $1,995

Used Cars For Sale

2017 Jeep Compass For Sale
462 listings starting at $710
2016 Jeep Compass For Sale
10 Great Deals out of 266 listings starting at $17,888
2015 Jeep Compass For Sale
103 listings starting at $14,900
2014 Jeep Compass For Sale
8 Great Deals out of 94 listings starting at $11,990
2013 Jeep Compass For Sale
51 listings starting at $11,995