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SUBJECT:Flash: 3.0L Powertrain Diagnostic And System EnhancementsOVERVIEW:This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latestavailable software. **It also involves the cleaning or replacement of the Exhaust GasTemperature (EGT) Sensor 1/2 and/or Catalyst Temperature Sensor if necessarydepending on Diagnostic Trouble Codes (DTCs) that may have set.**MODELS:2015(WK)Jeep Grand CherokeeNOTE: This bulletin applies to vehicles equipped with a 3.0L diesel engine (SalesCode EXF) and 8 speed transmission (Sales Code DFD).NUMBER:18-095-15GROUP:Vehicle PerformanceDATE:November 25, 2015
SYMPTOM/CONDITION:A small number of customers may experience a Malfunction Indicator Lamp (MIL)illumination. Upon further investigation a technician may find one or more of the followingDiagnostic Trouble Codes (DTCs) set in the PCM memory:•**P1296-00 - EGR Slow Response - Increasing Flow.•P249C-00 - Excessive Time To Enter Closed Loop Reductant Injection TimingControl.•P20C2-00 - Reductant Heater 3 Control Circuit Performance.•P1297-00 - EGR Slow Response - Decreasing Flow.•P0420-00 - Catalyst Efficiency (Bank 1).•P2237-00 - O2 Sensor 1/1 Pump Cell Current Circuit Open.•P24D1-00 - Particulate Matter Sensor Regeneration Incomplete.•U0422-00 - Implausible Data Received From Body Control Module.•P1E0C-00 - Empty Fuel Tank.•P2463-00 - Diesel Particulate Filter - Soot Accumulation.•P24A4-00 - Particulate Filter Restriction - Soot Accumulation Too High.**•P2299-00 - Brake Pedal Position/Accelerator Pedal Position Incompatible.•P208B-00 - Redundant Pump 1 Control Performance.•P1288-00 - NOX Sensor 1/2 Zero Offset Too High.•P2002-00 - Diesel Particulate Filter Efficiency Below Threshold.•P204F - Reductant System Performance.•P241D-00 - SCR Inducement - Forced Engine Shutdown.•P20E9 - Reductant Pressure Too High.**Upon further investigation a technician may find the following Diagnostic Trouble Code(DTC) set in the TCM memory:•U1424-00 - Implausible Engine Torque Signal Received.The following enhancements are also included in this software update.•DTC P0171-00 System Too Lean (Bank 1) has now changed to P026C-00 FuelInjection Quantity Lower Than Expected.•DTC P0172-00 System Too Rich (Bank 1) has now changed to P026D-00 FuelInjection Quantity Higher Than Expected.**DIAGNOSIS:Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available inTechCONNECT, verify all vehicle systems are functioning as designed. If DTCs arepresent, record them on the repair order and repair as necessary before proceeding furtherwith this bulletin.If a customerís VIN is listed in VIP or your RRT VIN list, perform the repair. For all othercustomers that describe the symptom/condition listed above or if the technician finds theDTC, perform the Repair Procedure.PARTS REQUIRED:**Qty.Part No.Description1 (AR)5146662ABCatalyst Temperature Sensor1 (AR)5146661ABEGT sensor 1/218-095-15-2-
NOTE: The parts listed above may be needed to complete the repair, they are notrequired to be changed.**REPAIR PROCEDURE:1. **Using wiTECH, check for any codes setting in the PCM and record them on therepair order. If necessary, perform a vehicle scan report and save it for your records.2. Using wiTECH, Check the PCM calibration and see if it is up to date. Does the PCMsoftware need to be updated?a. Yes>>> Proceed toStep #3.b. No>>> Proceed toStep #7.**NOTE: Install a battery charger to ensure battery voltage does not drop below 13.2volts. Do not allow the charging voltage to climb above 13.5 volts during theflash process.CAUTION: Do not interrupt the software update process in any way once it hasbegun. It may cause permanent damage to the PCM which will requirereplacement.3. Reprogram the PCM with the latest available software. Detailed instructions forflashing control modules using the wiTECH Diagnostic Application are available byselecting the ìHELPî tab on the upper portion of the wiTECH window, then ìHELPCONTENTS.î This will open the Welcome to wiTECH Help screen where help topicscan be selected.NOTE: If the module is up to date and no flashes are available use inspection LOP18-19-04-CW to close the active RRT.4. Clear all DTCs that may have been set in any module due to reprogramming. ThewiTECH application will automatically present all DTCs after the flash and allow themto be cleared.5. Under the PCM ìSystem Testsî perform the ìSCR DEF Tank Fluid Level Resetîprocedure.6. Turn the ignition off for 35 seconds to complete the flash.7. Verify the Transmission Control Module (TCM) is programmed with the latest availablesoftware. Refer to all applicable published service bulletins for detailed repairprocedures and labor times regarding updating the TCM software.8. **Refer back to the vehicle scan report recorded inStep #1. Is DTC P0420-00 -Catalyst Efficiency (Bank 1), found setting active or stored in the PCM memory?a. Yes>>> Proceed toStep #9.b. No>>> Proceed toStep #16.9. Remove the EGT Sensor 1/2 located in the inlet of the Diesel Particulate Filter(DPF)/Diesel Oxidation Catalyst (DOC) assembly. Refer to detailed removalprocedures available in DealerCONNECT> TechCONNECT> Service Info Section 11 -Exhaust System> Sensor, Exhaust Temperature> Removal> Exhaust GasTemperature Sensor 1/2.10. Remove the Catalyst Temperature Sensor located in the middle of the DieselParticulate Filter (DPF)/Diesel Oxidation Catalyst (DOC) assembly. Refer to detailedremoval procedures available in DealerCONNECT> TechCONNECT> Service InfoSection 11 - Exhaust System> Sensor, Exhaust Temperature> Removal> CatalystExhaust Temperature Sensor.-3-18-095-15
11. Inspect the sensor body and probe for any signs of damage or excessive soot. See(Fig. 1).Fig. 1 EGT Sensor Bank 1 Sensor 11 - Excessive soot blocking sensor ports12. Was excessive soot found on the sensor?a. Yes>>> Proceed toStep #13.b. No>>> Proceed toStep #14.13. Using shop air set to a maximum of 80 psi, clean all excessive soot from the sensorprobe.14. Using a suitable multi-meter with appropriate test probes, test the resistance betweenthe sensor connector terminals 1 and 2. With the sensor at room temperature, 65-75∞F (18-25 ∞C), the resistance should measure between 200 and 240 ohms.15. Is the temperature sensor resistance within specifications?a. Yes>>> Install the original EGT sensor 1/2 and/or Catalyst Temperature Sensor.Refer to detailed installation procedures available in DealerCONNECT>TechCONNECT> Service Info Section 11 - Exhaust System> Sensor, ExhaustTemperature> Installation> Exhaust Gas Temperature Sensor 1/2.b. No>>> Install a new EGT sensor 1/2 and/or Catalyst Temperature Sensor. Refer todetailed installation procedures available in DealerCONNECT> TechCONNECT>Service Info Section 11 - Exhaust System> Sensor, Exhaust Temperature>Installation> Exhaust Gas Temperature Sensor 1/2.16. Refer back to the vehicle scan report recorded inStep #1. Were DTCs P0171-00System Too Lean (Bank 1), P0172-00 System Too Rich (Bank 1), P026C-00 FuelInjection Quantity Lower Than Expected, and/or P026D-00 Fuel Injection QuantityHigher Than Expected, found setting active or stored in the PCM memory?a. Yes>>> Further diagnosis and repair is required. Refer to all applicable publishedTSBs or service information in DealerCONNECT/TechCONNECT regarding theseDTCs. The bulletin is now complete.
Posts in this Thread:
- Was my jeep service guy selling me thin air? (a little long), adl6009 , Thu, 27 Jun 2019 21:41:33
- Re: Was my jeep service guy selling me thin air? (a little long), No Snaab, Fri, 28 Jun 2019 04:06:15
- Good advice thanks, and another dealer story, adl6009 , Fri, 28 Jun 2019 08:01:27
- Re: Good advice thanks, and another dealer story, Dave The Ice Age Knave , Mon, 1 Jul 2019 18:20:12 <-- Viewing This Message
- Thank you, adl6009 , Wed, 3 Jul 2019 20:43:48
- Re: Thank you, Dave The Ice Age Knave , Thu, 4 Jul 2019 06:23:441
- Re: Good advice thanks, and another dealer story, Chip Fichot, Fri, 28 Jun 2019 09:46:02
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