Emissions - OBD System Won't Indicate I/M Test Readiness
NUMBER: 25-001-07GROUP: Emissions
DATE: February 09, 2007
SUBJECT:
I/M Readiness Check Continues To Indicate OBD System Is Not Ready For I/M Testing
OVERVIEW:
This bulletin involves modifying wiring in the Power Distribution Center (PDC).
MODELS:
2005 - 2006 (TJ) Wrangler
NOTE:
This bulletin applies to vehicles equipped with a 2.4L or 4.0L engine (sales code EDI or ERH respectively).
SYMPTOM/CONDITION:
Vehicle On Board Diagnostics (OBD) system will not indicate readiness for I/M emissions testing. (See Emissions Inspection and Maintenance Programs' in section 7 of the Wrangler owner's manual to determine if vehicle is ready for I/M testing.)
DIAGNOSIS:
After turning ignition key to the ON position without cranking the engine, the Malfunction Indicator Lamp (MIL) should remain illuminated solid. If the MIL flashes for 10 seconds approximately 15 seconds after turning the key to the ON position (without cranking the engine) and then returns to solid illumination, the vehicle is not ready for I/M testing. Perform the Repair Procedure.
PARTS REQUIRED:
SPECIAL TOOLS/EQUIPMENT REQUIRED:
REPAIR PROCEDURE:
1. Remove and isolate the positive and negative battery cables from the battery.
2. Remove the Power Distribution Center (PDC) cover from the PDC.
3. Locate the ASD (Auto Shut Down) and the Fuel Pump relays in the PDC.
4. Remove the two nuts used to secure the positive battery cable to the PDC. Remove the positive battery cable from the PDC.
5. Remove the PDC from its bracket and remove the cover from the bottom of the PDC to expose the underside wiring.
6. Locate the terminal end in PDC cavity A13 that connects to the ASD relay pin 85. Two 20 gauge wires, each of PK/WT color, are crimped to this terminal end. (Fig. 1).
7. At PDC cavity A13 (ASD), locate the one PK/WT wire that connects to the fuel pump relay terminal.
8. Cut the PK/WT wire, that connects to the fuel pump relay, as close to the PDC cavity A13 terminal as possible, (Fig. 2).
9. At the same PDC cavity A13, cut the other PK/WT wire approximately 2 inches from the terminal.
10. There are now three (3) PK/WT wires. Strip approximately 0.25 inches of the insulation from the ends of all three PK/WT wires.
11. Spice the one PK/WT wire leading from fuel pump relay to the one PK/WT wire leading from wire harness bundle with convolute (Fig. 4). Be sure to slide shrink tube over wire before crimping. Splice the wires with kit p/n 05018395AA.
NOTE:
The remaining ASD relay wire in PDC cavity A13 (2 inch lead) should not be connected to anything at this point.
12. Locate the RD/YL 18 gauge wire connected to the terminal end in PDC cavity A15. This wire connects the ASD relay pin 30 to fuse # 9 (ASD power) in the PDC.
13. Cut this wire approximately 2 inches from the PDC cavity A15 terminal (ASD relay pin 30) (Fig. 3).
14. Strip approximately 0.25 inches of insulation from both ends of the RD/YL wire cut in Step # 13.
15. Splice the two RD/YL wires to the one remaining PK/WT wire (2 inch lead at A13) together (Fig. 4). Be sure to slide shrink tube over wire before crimping. Splice the wires with kit p/n 05018395AA.
16. After both splices are complete, solder crimp splices with non-acid core solder.
17. Slide shrink tube over soldered splices and shrink with a heat gun until sealant is visible on both ends of the splice (Fig. 4).
18. Install the cover on the bottom of the PDC.
19. Install the PDC to its bracket.
20. Install the positive battery cable to the PDC. Tighten both attaching nuts to 11.3 Nm (100 in. lbs.).
21. Install the positive and negative battery cables from the battery.
22. Set the clock to the correct time.
23. After the Repair Procedure is completed, the vehicle will need to be driven to update the OBD system. It may require several days of normal drive cycles to update all of the required OBD monitors.
a. The vehicle is ready for I/M emissions testing when the Malfunction Indicator Lamp (MIL) remains illuminated continuously after turning the ignition key to the ON position without cranking the engine.
b. The vehicle is NOT ready for I/M emissions testing, when the MIL flashes for 10 seconds approximately 15 seconds after turning the key to the ON position (without cranking the engine) and then returns to continuous illumination. The vehicle will require further drive cycles. If this condition persists after several days of further drive cycles, then additional diagnosis may be required.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE:
Disclaimer:
This bulletin is supplied as technical information only and is not an authorization for repair.