2008 JEEP WRANGLER engine

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Page 380 of 466

JEEP WRANGLER 2008 JK / 3.G Owners Manual ONBOARD DIAGNOSTIC SYSTEM — OBD II
Your vehicle is equipped with a sophisticated onboard
diagnostic system called OBD II. This system monitors
the performance of the emissions, engine, and automatic

Page 381 of 466

JEEP WRANGLER 2008 JK / 3.G Owners Manual Loose Fuel Filler Cap Message
After fuel is added, the vehicle diagnostic system can
determine if the fuel filler cap is possibly loose, improp-
erly installed, or damaged. A “gASCAP” message will

Page 382 of 466

JEEP WRANGLER 2008 JK / 3.G Owners Manual Your vehicle has a simple ignition key-actuated test,
which you can use prior to going to the test station. To
check if your vehicle’s OBD II system is ready, you must
do the following:
1. Insert yo

Page 383 of 466

JEEP WRANGLER 2008 JK / 3.G Owners Manual serviced before going to the I/M station. The I/M station
can fail your vehicle because the MIL is on with the
engine running.
REPLACEMENT PARTS
Use of genuine MOPARparts for normal/scheduled
mainten

Page 384 of 466

JEEP WRANGLER 2008 JK / 3.G Owners Manual MAINTENANCE PROCEDURES
The pages that follow contain therequiredmaintenance
services determined by the engineers who designed your
vehicle.
Besides the maintenance items for which there are fixed
main

Page 385 of 466

JEEP WRANGLER 2008 JK / 3.G Owners Manual CAUTION!
Overfilling or underfilling the crankcase will cause
aeration or loss of oil pressure. This could damage
your engine.
Change Engine Oil
Refer to the Maintenance Schedule in Section 8 for
reco

Page 386 of 466

JEEP WRANGLER 2008 JK / 3.G Owners Manual Lubricants which do not have both, the engine oil certi-
fication mark and the correct SAE viscosity grade num-
ber, should not be used.
Synthetic Engine Oils
Synthetic engine oils can be used if the

Page 387 of 466

JEEP WRANGLER 2008 JK / 3.G Owners Manual Drive Belts — Check Condition and Tension
Belt tension is controlled by means of an automatic
tensioner. No belt tension adjustments are required.
However, belt and belt tensioner condition should b