2004 JEEP WRANGLER check engine

Maintenance After Off-Road Driving
After extended operation in mud, sand or water, or
similar dirty conditions, have your brake drums, brake
linings, and axle joints inspected and cleaned as soon as
possible. This will prevent any abrasive material from
causing excessive wear or unpredictable braking action.
Following off-road usage, completely inspect the under-
body of your vehicle. Check tires, body structure, steer-
ing, suspension and exhaust system for damage. Check
threaded fasteners for looseness, particularly on the
chassis, drivetrain components, steering and suspension.
Retighten, if required, to torque values specified in the
Service Manual. Also check for accumulations of vegeta-
tion or brush that could become a fire hazard, or conceal
damage to fuel lines, brake hoses, axle pinion seals, and
propeller shafts. Check air conditioning drain tube on the
lower dash wall in the engine compartment for mud or
debris, and clean as required. A plugged tube will
adversely affect air conditioning performance.CAUTION!
Under frequent heavy-duty driving conditions,
change all lubricants, and lubricate body compo-
nents and steering linkage more often than in nor-
mal service to prevent excessive wear.
FUSE PANEL
Interior Fuses
The fuse panel is located behind the glove box.
254 MAINTAINING YOUR VEHICLE

NOTE:Most vehicles are operated under the conditions
listed for Schedule ªB.º
Second is ScheduleªAº. It is for vehicles that are not
operated under any of the conditions listed under Sched-
ule ªB.º
Use the schedule that best describes your driving condi-
tions. Where time and mileage are listed, follow the
interval that occurs first.
CAUTION!
Failure to perform the required maintenance items
may result in damage to the vehicle.
At Each Stop for Fuel
²
Check the engine oil level about 5 minutes after a fully
warmed engine is shut off. Checking the oil level while
the vehicle is on level ground will improve the accu-
racy of the oil level reading. Add oil only when the
level is at or below the ADD or MIN mark.
²Check the windshield washer solvent, add as required.
Once a Month
²
Check the tire pressure and look for unusual wear or
damage.
²Inspect the battery and clean and tighten the terminals
as required.
²Check the fluid levels of the coolant reservoir, brake
master cylinder, and transmission, and add as needed.
²Check all lights and all other electrical items for correct
operation.
At Each Oil Change
²
Change the engine oil filter.
²Inspect the exhaust system.
²Inspect brake hoses.
²Check the coolant level, hoses, and clamps.
²Inspect manual transmission fluid level Ð if
equipped.
MAINTENANCE SCHEDULES 263
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M
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A
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C
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C
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D
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About Your Brakes...................... 177
Add-A-Trunk........................... 65
Adding Washer Fluid.................... 155
Air Cleaner, Engine..................... 234
Air Conditioner Maintenance.............. 235
Air Conditioning....................... 151
Air Conditioning Controls................ 152
Air Conditioning, Operating Tips........... 154
Air Conditioning Refrigerant.............. 236
Air Filter............................. 234
Air Pressure, Tires...................... 192
Airbag................................ 22
Airbag Deployment...................... 27
Airbag Light........................29,118
Airbag Maintenance...................... 29
Airbag On/Off Switch.................... 26
Alignment and Balance.................. 195
Alterations/Modifications, Vehicle............ 8
Antenna, Satellite Radio.................. 147
Antifreeze (Engine Coolant)............... 258
Anti-Lock Brake System.................. 179
Anti-Lock Warning Light................. 119
Appearance Care....................... 248Ashtray............................... 62
Ashtrays and Lighter..................... 62
Automatic Dimming Mirror................ 46
Automatic Transmission...............165,245
Adding Fluid........................ 246
Fluid and Filter Changes................ 245
Fluid Level Check..................... 245
Fluid Type.......................... 245
Gear Ranges......................... 166
Shifting............................ 165
Special Additives..................... 246
Torque Converter..................... 170
Auxiliary Electrical Outlet................. 63
Auxiliary Power Outlet................... 63
Battery............................... 234
Emergency Starting.................... 216
Voltmeter........................... 116
Belts, Drive........................... 231
Belts, Seat............................. 17
Body Mechanism Lubrication.............. 237
Brake System.......................... 243
Anti-Lock........................... 179
288 INDEX

Hoses.............................. 243
Master Cylinder...................... 244
Parking............................ 175
Warning Light....................... 119
Brakes............................... 177
Brake/Transmission Interlock.............. 166
Break-In Recommendations, New Vehicle...... 39
Bulb Replacement...................... 257
Calibration, Compass..................... 47
Capacities, Fluid....................... 258
Caps, Filler
Fuel............................... 200
Power Steering....................... 236
Car Washes........................... 249
Carpeting............................. 252
Cassette Tape and Player Maintenance....... 148
Cassette Tape Player.........126,130,132,140,142
Catalytic Converter..................... 232
Caution, Exhaust Gas..................... 40
CD Changer........................133,138
CD Player......................128,135,137
CD Player Maintenance.................. 149Cellular Phone......................... 149
Chains, Tire........................... 196
Changing A Flat Tire.................... 213
Chart, Tire Sizing....................... 185
Check Engine Light..................... 118
Child Restraint.....................29,33,36
Child Restraint Tether Anchors............. 33
Cigar Lighter........................... 62
Climate Control........................ 149
Clock................................ 120
Clutch Interlocking Ignition System......160,165
Compact Disc Maintenance............... 149
Compact Disc Player.................... 140
Compass.............................. 46
Compass Calibration..................... 47
Compass Variance....................... 48
Console............................... 65
Console, Floor.......................... 65
Contract, Service....................... 282
Converter, Catalytic..................... 232
Cooling System........................ 239
Adding Coolant (Antifreeze)............. 241
Coolant Capacity..................... 258
INDEX 289
10

Coolant Temperature Gauge............. 118
Engine Oil Pressure Gauge.............. 117
Jacking............................. 211
Jump Starting........................ 216
Emission Control System Maintenance....226,262
Engine
Air Cleaner.......................... 234
Block Heater......................... 162
Break-In Recommendations............... 39
Compartment........................ 224
Exhaust Gas Caution................... 40
Fails to Start......................... 161
Flooded, Starting..................... 161
Fuel Requirements.................197,258
Jump Starting........................ 216
Oil .............................228,258
Oil Disposal......................... 231
Oil Filter............................ 231
Oil Pressure Gauge.................... 117
Oil Selection......................... 258
Overheating......................... 210
Starting............................ 160
Temperature Gauge.................... 118Engine Oil Viscosity Chart................ 230
Entry System, Illuminated................. 15
Exhaust Gas Caution..................... 40
Exhaust System........................ 238
Extender, Seat Belt....................... 21
Exterior Finish Care..................... 249
Fabric Care........................250,252
Fabric Top............................ 250
Filters
Air Cleaner.......................... 234
Engine Fuel......................... 234
Engine Oil.......................... 231
Finish Care........................... 249
Flashers
Hazard Warning...................... 210
Turn Signal.......................... 116
Flooded Engine Starting.................. 161
Fluid Capacities........................ 258
Fluid Level Checks...................... 248
Automatic Transmission................ 245
Engine Oil.......................... 228
Manual Transmission.................. 247
INDEX 291
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Hood Release.......................... 55
Hoses............................242,243
Hydraulic Clutch Fluid.................. 246
Ignition
Key ................................ 11
Illuminated Entry....................... 15
Infant Restraint.......................29,30
Inflation Pressure Tires................... 192
Inside Rearview Mirror................... 46
Instrument Cluster...................... 115
Instrument Panel and Controls............. 114
Interior Appearance Care................. 252
Interior Fuses.......................... 254
Interior Lights.......................... 56
Intermittent Wipers...................... 58
Introduction............................ 4
Jack Location.......................... 211
Jack Operation......................... 214
Jacking Instructions..................... 214
Jump Starting......................... 216Key, Programming....................... 13
Key Release Button...................... 11
Key, Replacement....................... 13
Key, Sentry............................ 12
Key-In Reminder........................ 12
Keys................................. 11
Lane Change and Turn Signals............. 116
Lap Belts.............................. 17
Lap/Shoulder Belts...................... 17
LATCH (Lower Anchors and Tether
for CHildren)........................... 33
Lead Free Gasoline...................... 197
Lighter, Cigar.......................... 62
Lights................................ 56
Airbag...........................29,118
Anti-Lock........................... 119
Anti-Lock Warning.................... 119
Brake Warning....................... 119
Check Engine........................ 118
Check Gauges........................ 118
Cruise.............................. 116
INDEX 293
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