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Unread 05-30-2015, 01:26 PM   #1
cbran61
Registered User
2001 WJ 
 
Join Date: Jun 2014
Location: cumming, ga
Posts: 3
02 sensor error Help ASAP

I replaced all 4 sensors after the check engine light came on and the emissions test failed with 3 error codes, P0031, P0051, P0136.
The P0136 did not clear when the sensor was replaced.
I have a 2001 JGC with the 4.0 IL 6. California emissions with the 4 sensors.

Any ideas?

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Unread 05-31-2015, 08:36 PM   #2
outofrng623
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2004 WJ 
 
Join Date: Aug 2012
Location: yonkers, ny
Posts: 676
P0136-O2 SENSOR 1/2 HEATER CIRCUIT MALFUNCTION
When Monitored: Ignition On, with battery voltage greater than 10.4 volts.
Set Condition: The state of the PCM relay control circuit, between the PCM and relay
coil, does not match the desired state.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
O2 SENSOR HEATER RELAY
(F142) FUSED ASD RELAY OUTPUT CIRCUIT
(K512) O2 HEATER RELAY CONTROL CIRCUIT OPEN
(K512) O2 HEATER RELAY CONTROL CIRCUIT SHORTED TO GROUND
O2 HEATER ELEMENT
(K200) O2 HEATER RELAY OUTPUT CIRCUIT
PCM
TEST ACTION APPLICABILITY
1 Check for any related TSBs.
Ignition on, engine not running.
With the DRBIIIt, read DTCs and record the related Freeze Frame data.
NOTE: If P0031 and P0051 are set along with P0136, inspect the related fuse
and repair as necessary.
Is the Good Trip Counter displayed and equal to zero?
All
Yes ! Go To 2
No ! Refer to the INTERMITTENT CONDITION Symptom (Diagnostic
Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2 Turn the ignition off.
Remove the O2 Sensor Heater Relay from the PDC.
Measurement is taken at the Heater Relay component.
Measure the resistance of the O2 Sensor Heater Relay Coil.
Is the resistance above 100 ohms?
All
Yes ! Replace the O2 Sensor Heater Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 3
77
DRIVEABILITY - GAS
TEST ACTION APPLICABILITY
3 Ignition on, engine not running.
With the DRBIIIt, actuate the ASD Relay.
Using a 12-volt test light connected to ground, probe the (F142) Fused ASD Relay
Output circuit of the O2 Heater Relay in the PDC.
Does the test light illuminate brightly when the relay actuates?
All
Yes ! Go To 4
No ! Repair the open or short to ground in the (F142) ASD Relay
Output circuit. Inspect the related fuse and repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4 Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance of the (K512) O2 Heater Relay Control circuit from the PDC
(Heater Relay) connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes ! Go To 5
No ! Repair the open in the (K512) O2 Heater Relay Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5 Measure the resistance between ground and the (K512) O2 Heater Relay Control
circuit at the PDC connector.
Is the resistance below 100 ohms?
All
Yes ! Repair the short to ground in the (K512) O2 Sensor Heater Relay
Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 6
6 NOTE: Allow the O2 Sensor to cool to room temperature.
Disconnect the 1/2 and 2/2 O2 Sensor harness connectors.
Measure the resistance across each of the O2 Sensors Heater element, component
side.
The resistance value for a 4.0L O2 Heater element is 4.0 to 5.0 ohms and 12.1 to 14.8
ohms for a 4.7L O2 Heater element at 70°F (21.1°C).
NOTE: The resistance value increases with temperature.
Is the resistance value within the listed specifications?
All
Yes ! Go To 7
No ! Replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
7 Install the O2 Sensor Heater Relay.
Connect the PCM harness connectors.
Ignition on, engine not running.
With the DRBIIIt, actuate the O2 Heater Test.
Using a 12-volt test light connected to ground, probe the (K200) O2 Heater Relay
Output circuit at the 1/2 and 2/2 O2 Sensor harness connectors.
Does the test light illuminate brightly when the Relay is actuated?
All
Yes ! Go To 8
No ! Repair the open or short to ground in the (K200) O2 Heater Relay
Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
78
DRIVEABILITY - GAS
P0136-O2 SENSOR 1/2 HEATER CIRCUIT MALFUNCTION — Continued
TEST ACTION APPLICABILITY
8 NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or 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 not possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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Unread 05-31-2015, 10:09 PM   #3
ezflip
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2002 WJ 
 
Join Date: Oct 2008
Location: Michigan
Posts: 5,673
What brand sensors did you use? Mopar ONLY on these. No guarentees with any other brand. There have been reported issues with every other brand including those that claim to be OEM from Denso and NTK. If they don't come directly from Mopar, there is no guarentee they were made to the proper tolerances for WJs.
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2002 Overland - 4.7 HO, "Select-Drive", 4" RC long arms, TAG front winch bumper, 32" BFG KM's, 3" exhaust, Magnaflow hi-flow cat, Flowmaster 50 series


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Unread 05-31-2015, 10:44 PM   #4
rm2001wj
Registered User
2001 WJ 
 
Join Date: Aug 2005
Location: Memphis, TN
Posts: 3,218
Check or simply replace the 15A fuse F16 in the power distribution center (PDC) under the hood.
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