2008-2012 Jeep Patriot Service & Repair Manual
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2007-2012 JEEP PATRIOT
SERVICE AND REPAIR MANUAL
2012 ENGINE
2.0L - Service Information - Compass & Patriot
DESCRIPTION
DESCRIPTION
The 2.0 Liter (122 cu. in.) in-line four cylinder engine is a double over head camshaft with mechanical lash
buckets and four valves per cylinder design. This engine is NOT free-wheeling; meaning that the pistons will
contact the valves in the event of a timing chain failure.
The cylinders are numbered from front of the engine to the rear. The firing order is 1-3-4-2.
The engine serial number is located on the rear of the cylinder block. The serial number contains engine build
date information.
DIAGNOSIS AND TESTING
INTRODUCTION
Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by routine
maintenance.
These malfunctions may be classified as either mechanical (e.g., a strange noise), or performance (e.g., engine
idles rough and stalls).
Refer to the Engine MECHANICAL and the Engine PERFORMANCE diagnostic charts, for possible causes
and corrections of malfunctions.
For fuel system diagnosis. Refer to FUEL SYSTEM article.
Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that cannot be
isolated with the Service Diagnosis charts. Information concerning additional tests and diagnosis is provided
within the following:
Cylinder Compression Pressure Test
Cylinder Combustion Pressure Leakage Test
Engine Cylinder Head Gasket Failure Diagnosis
Intake Manifold Leakage Diagnosis
Mechanical Valve Tappet Noise Diagnosis
Engine Oil Leak Inspection
PERFORMANCE
2012 Jeep Patriot Limited
2012 ENGINE 2.0L - Service Information - Compass & Patriot
CONDITION POSSIBLE CAUSE CORRECTION
ENGINE WILL NOT START 1. Weak battery. 1. Test battery. Charge or replace as
necessary. Refer to DIAGNOSIS
AND TESTING .
2. Corroded or loose battery
connections.
2. Clean and tighten battery
connections. Apply a coat of light
mineral grease to terminals.
3. Faulty starter. 3. Test starting system. Check for
codes. (Refer to Appropriate
Diagnostic Information)
4. Faulty coil(s) or control unit. 4. Test and replace as needed. (Refer
to Appropriate Diagnostic
Information)
5. Incorrect spark plug gap. 5. Set gap. Refer to
SPECIFICATIONS .
6. Contamination in fuel system. 6. Clean system and replace fuel
filter.
7. Faulty fuel pump. 7. Test fuel pump and replace as
needed. (Refer to Appropriate
Diagnostic Information)
8. Incorrect engine timing. 8. Check for a skipped timing
belt/chain.
ENGINE STALLS OR IDLES
ROUGH
1. Idle speed too low. 1. Test minimum air flow. (Refer to
Appropriate Diagnostic Information)
2. Incorrect fuel mixture. 2. (Refer to Appropriate Diagnostic
Information)
3. Intake manifold leakage. 3. Inspect intake manifold, manifold
gasket, and vacuum hoses.
4. Faulty ignition coil(s). 4. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
5. Contamination in Oil Control
Valve (OCV).
5. Remove OCV and inspect for
contamination. Replace OCV if
contaminated.
ENGINE LOSS OF POWER 1. Dirty or incorrectly gapped
plugs.
1. Clean plugs and set gap.
2. Contamination in fuel system. 2. Clean system and replace fuel
filter.
3. Faulty fuel pump. 3. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
4. Incorrect valve timing. 4. Correct valve timing.
5. Leaking cylinder head gasket. 5. Replace cylinder head gasket.
6. Low compression. 6. Test compression of each
2012 Jeep Patriot Limited
2012 ENGINE 2.0L - Service Information - Compass & Patriot
MECHANICAL
cylinder.
7. Burned, warped, or pitted
valves.
7. Replace valves.
8. Plugged or restricted exhaust
system.
8. Perform exhaust restriction test.
Install new parts, as necessary. Refer
to DIAGNOSIS AND TESTING .
9. Faulty ignition coil(s). 9. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
ENGINE MISSES ON
ACCELERATION
1. Dirty or incorrectly gapped
spark plugs.
1. Clean spark plugs and set gap.
2. Contamination in Fuel System. 2. Clean fuel system and replace fuel
filter.
3. Burned, warped, or pitted
valves.
3. Replace valves.
4. Faulty ignition coil(s). 4. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
ENGINE MISSES AT HIGH
SPEED
1. Dirty or incorrect spark plug
gap.
1. Clean spark plugs and set gap.
2. Faulty ignition coil(s). 2. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
3. Dirty fuel injector(s). 3. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
4. Contamination in fuel system. 4. Clean system and replace fuel
filter.
CONDITION POSSIBLE CAUSES CORRECTION
VALVETRAIN NOISE 1. High or low oil level in
crankcase.
1. Check and correct engine oil
level.
2. Thin or diluted oil. 2. Change oil to correct viscosity.
3. Thick oil 3. (a) Change engine oil and filter.
(b) Run engine to operating
temperature.
(c) Change engine oil and filter
again.
4. Low oil pressure. 4. (a) Check and correct engine oil
level.
(b) Check pressure regulating
valve.
2012 Jeep Patriot Limited
2012 ENGINE 2.0L - Service Information - Compass & Patriot
5. Worn cam lobe. 5. Install new camshaft.
6. Worn tappet bucket. 6. Install new select fit tappet
bucket.
7. Worn valve guides. 7. Replace cylinder head.
8. Excessive runout of valve seats
on valve faces.
8. Grind valve seats and replace
valves.
CONNECTING ROD NOISE 1. Insufficient oil supply. 1. Check engine oil level.
2. Low oil pressure. 2. Check engine oil level. Inspect
oil pump relief valve and spring.
3. Thin or diluted oil. 3. Change oil to correct viscosity.
4. Thick oil 4. (a) Change engine oil and filter.
(b) Run engine to operating
temperature.
(c) Change engine oil and filter
again.
5. Excessive bearing clearance. 5. Measure bearings for correct
clearance. Repair as necessary.
6. Connecting rod journal out-of-
round.
6. Replace crankshaft or grind
surface.
7. Connecting rod out-of-round. 7. Replace connecting rod.
8. Misaligned connecting rods. 8. Replace bent connecting rods.
MAIN BEARING NOISE 1. Insufficient oil supply. 1. Check engine oil level.
2. Low oil pressure. 2. Check engine oil level. Inspect
oil pump relief valve and spring.
3. Thin or diluted oil. 3. Change oil to correct viscosity.
4. Thick oil 4. (a) Change engine oil and filter.
(b) Run engine to operating
temperature.
(c) Change engine oil and filter
again.
5. Excessive bearing clearance. 5. Measure bearings for correct
clearance. Repair as necessary.
6. Excessive end play. 6. Check thrust bearing for wear
on flanges.
7. Crankshaft journal out-of-round
or worn.
7. Replace crankshaft or grind
journals.
8. Loose flywheel or torque
converter.
8. Tighten to correct torque.
OIL PRESSURE DROP 1. Low oil level. 1. Check engine oil level.
2. Faulty oil pressure sending unit. 2. Install new sending unit.
3. Low oil pressure. 3. Check sending unit and main
bearing oil clearance.
4. Clogged oil filter. 4. Install new oil filter.
2012 Jeep Patriot Limited
2012 ENGINE 2.0L - Service Information - Compass & Patriot
CYLINDER COMBUSTION PRESSURE LEAKAGE TEST
The combustion pressure leakage test provides an accurate means for determining engine condition.
Combustion pressure leakage testing will detect:
Exhaust and intake valve leaks (improper seating).
Leaks between adjacent cylinders or into water jacket.
Any causes for combustion/compression pressure loss.
1. Check the coolant level and fill as required. DO NOT install the pressure cap.
2. Start and operate the engine until it attains normal operating temperature, then turn the engine OFF.
3. Clean spark plug recesses with compressed air.
5. Worn parts in oil pump. 5. Replace balance shaft module.
6. Thin or diluted oil. 6. Change oil to correct viscosity.
7. Oil pump relief valve stuck. 7. Remove valve and inspect,
clean, or replace.
8. Excessive bearing clearance. 8. Measure bearings for correct
clearance.
OIL LEAKS 1. Misaligned or deteriorated
gaskets.
1. Replace gasket(s).
2. Loose fastener, broken or
porous metal part.
2. Tighten, repair or replace the
part.
3. Misaligned or deteriorated cup
or threaded plug.
3. Replace as necessary.
OIL CONSUMPTION OR
SPARK PLUGS FOULED
1. PCV system malfunction. 1. Check system and repair as
necessary. Refer to VALVE,
POSITIVE CRANKCASE
VENTILATION (PCV),
DIAGNOSIS AND TESTING .
2. Worn, scuffed or broken rings. 2. Hone cylinder bores. Install
new rings.
3. Carbon in oil ring slots. 3. Install new rings.
4. Rings fitted too tightly in
grooves.
4. Remove rings and check
grooves. If groove is not proper
width, replace piston.
5. Worn valve guide(s). 5. Replace cylinder head.
6. Valve stem seal(s) worn or
damaged.
6. Replace seal(s).
WARNING: Do not remove the pressure cap with the system hot and under pressure
because serious burns from coolant can occur.
2012 Jeep Patriot Limited
2012 ENGINE 2.0L - Service Information - Compass & Patriot
4. Remove the spark plugs.
5. Remove the oil filler cap.
6. Remove the air cleaner.
7. Calibrate the tester according to the manufacturer's instructions. The shop air source for testing should
maintain 483 kPa (70 psi) minimum, 1, 379 kPa (200 psi) maximum, with 552 kPa (80 psi)
recommended.
8. Perform the test procedures on each cylinder according to the tester manufacturer's instructions. While
testing, listen for pressurized air escaping through the throttle body, tailpipe and oil filler cap opening.
Check for bubbles in the coolant.
9. All gauge pressure indications should be equal, with no more than 25% leakage per cylinder.
10. FOR EXAMPLE: At 552 kPa (80 psi) input pressure, a minimum of 414 kPa (60 psi) should be
maintained in the cylinder.
CYLINDER COMPRESSION PRESSURE TEST
The results of a cylinder compression pressure test can be utilized to diagnose several engine malfunctions.
Ensure the battery is completely charged and the engine starter motor is in good operating condition. Otherwise
the indicated compression pressures may not be valid for diagnosis purposes.
1. Check engine oil level and add oil if necessary.
2. Drive the vehicle until engine reaches normal operating temperature. Select a route free from traffic and
other forms of congestion, observe all traffic laws, and accelerate through the gears several times briskly.
3. Remove engine cover.
4. Disconnect coil electrical connectors and remove coils.
5. Remove all spark plugs from engine. As spark plugs are being removed, check electrodes for abnormal
firing indicators such as fouled, hot, oily, etc. Record cylinder number of spark plug for future reference.
6. Disconnect injector electrical connectors.
7. Insert compression pressure adaptor (special tool #8116, Adapter, Pressure PEP) or the equivalent, into
the #1 spark plug hole in cylinder head. Connect the 0-500 psi (Blue) pressure transducer CH7059 with
cable adaptors to the DRBIII®. For Special Tool identification. Refer to Engine - Special Tools .
8. Crank engine until maximum pressure is reached on gauge. Record this pressure as #1 cylinder pressure.
9. Repeat the previous step for all remaining cylinders.
10. Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cylinder
to cylinder.
11. If one or more cylinders have abnormally low compression pressures, repeat the compression test.
12. If the same cylinder or cylinders repeat an abnormally low reading on the second compression test, it
could indicate the existence of a problem in the cylinder in question. The recommended compression
pressures are to be used only as a guide to diagnosing engine problems. An engine should not be
disassembled to determine the cause of low compression unless some malfunction is present.
OIL CONSUMPTION TEST AND DIAGNOSIS
2012 Jeep Patriot Limited
2012 ENGINE 2.0L - Service Information - Compass & Patriot
Diagnostic Procedures
The following diagnostic procedures are used to determine the source of excessive internal oil Consumption,
these procedures and tests apply to vehicles with 50, 000 miles or less.
Severe service (high ambient temperature, short trips, heavy loading, trailer towing, taxi, off-road, or law
enforcement use) may result in greater oil consumption than normal.
Sustained high speed driving and high engine RPM operation may result in increased oil consumption.
Failure to comply with the recommended oil type and viscosity rating, as outlined in the owner's manual,
may impact oil economy as well as fuel economy.
Oil consumption may increase with vehicle age and mileage due to normal engine wear.
Oil leakage is not the same as oil consumption and all external leakage must be eliminated before
any action can be taken to verify and/or correct oil consumption complaints.
Verify that the engine has the correct oil level dipstick and dipstick tube installed.
Verify that the engine is not being run in an overfilled condition. Check the oil level 15 minutes
after a hot shutdown with the vehicle parked on a level surface. In no case should the level be above
MAX or the FULL mark on the dipstick.
OIL CONSUMPTION TEST
1. Check the oil level at least 15 minutes after a hot shutdown.
2. If the oil level is low, top off with the proper viscosity and API service level engine oil. Add one bottle of
MOPAR® 4-In-1 Leak Detection Dye into the engine oil.
3. Tamper proof the oil pan drain plug, oil filter, dipstick and oil fill cap.
4. Record the vehicle mileage.
5. Instruct the customer to drive the vehicle as usual.
6. Ask the customer to return to the servicing dealer after accumulating 500 miles, Check the oil level at
least 15 minutes after a hot shutdown. If the oil level is half way between the "FULL" and "ADD" mark
continue with the next step.
7. Using a black light, re-check for any external engine oil leaks, repair as necessary, if no external engine
oil leaks are present, continue with oil consumption diagnosis.
OIL CONSUMPTION DIAGNOSIS
NOTE: Engine oil consumption may be greater than normal during engine break-in.
Repairs should be delayed until vehicle has been driven at least 7, 500 miles.
NOTE: Because a few drops of external oil leakage per mile can quickly account for the
loss of one quart of oil in a few hundred miles, ensure no external engine oil
leaks are present.
2012 Jeep Patriot Limited
2012 ENGINE 2.0L - Service Information - Compass & Patriot
1. Check the positive crankcase ventilation (PCV) system. Make sure the system is not restricted and the
PCV valve has the correct part number and correct vacuum source (18-20 in. Hg at idle below 3000 ft.
above sea level is considered normal).
2. Perform a CYLINDER COMPRESSION PRESSURE TEST and CYLINDER - TO - CYLINDER
LEAKAGE TEST using the standard leak down gauge following manufacturers suggested best
practices.
3. If one or more cylinders have more than 15% leak down further engine tear down and inspection will be
required.
TOP 19 REASONS THAT MAY LEAD TO ENGINE OIL CONSUMPTION
1. Tapered and Out-of-Round Cylinders
The increased piston clearances permit the pistons to rock in the worn cylinders. While tilted
momentarily, an abnormally large volume of oil is permitted to enter on one side of the piston. The rings,
also tilted in the cylinder, permit oil to enter on one side. Upon reversal of the piston on each stroke, some
of this oil is passed into the combustion chamber.
2. Distorted Cylinders
This may be caused by unequal heat distribution or unequal tightening of cylinder head bolts. This
condition presents a surface which the rings may not be able to follow completely. In this case, there may
be areas where the rings will not remove all of the excess oil. When combustion takes place, this oil will
be burned and cause high oil consumption.
3. Improper operation of "PCV "system
The main purpose of the Positive Crankcase Ventilation (PCV) valve is to recirculate blow-by gases back
from the crankcase area through the engine to consume unburned hydrocarbons. The PCV system usually
has a one way check valve and a make up air source. The system uses rubber hoses that route crankcase
blow by gases to the intake manifold. Vacuum within the engine intake manifold pulls the blow by gases
out of the crankcase into the combustion chamber along with the regular intake air and fuel mixture.
The PCV system can become clogged with sludge and varnish deposits and trap blow by gases in the
crankcase. This degrades the oil, promoting additional formation of deposit material. If left uncorrected,
the result is plugged oil rings, oil consumption, rapid ring wear due to sludge buildup, ruptured gaskets
and seals due to crankcase pressurization.
4. Worn Piston Ring Grooves
For piston rings to form a good seal, the sides of the ring grooves must be true and flat - not flared or
NOTE: Verify the spark plugs are not oil saturated. If the spark plugs are oil
saturated and compression is good it can be assumed the valve seals or
valve guides are at fault.
2012 Jeep Patriot Limited
2012 ENGINE 2.0L - Service Information - Compass & Patriot
shouldered. Piston rings in tapered or irregular grooves will not seal properly and, consequently, oil will
pass around behind the rings into the combustion chamber.
5. Worn, Broken or Stuck Piston Rings
When piston rings are broken, worn or stuck to such an extent that the correct tension and clearances are
not maintained, this will allow oil to be drawn into the combustion chamber on the intake stroke and hot
gases of combustion to be blown down the cylinder past the piston on the power stroke. All of these
conditions will result in burning and carbon build up of the oil on the cylinders, pistons and rings.
6. Cracked or Broken Ring Lands
Cracked or broken ring lands prevent the rings from seating completely on their sides and cause oil
pumping. This condition will lead to serious damage to the cylinders as well as complete destruction of
the pistons and rings. Cracked or broken ring lands cannot be corrected by any means other than piston
replacement.
7. Worn Valve Stems and Guides
When wear has taken place on valve stems and valve guides, the vacuum in the intake manifold will draw
oil and oil vapor between the intake valve stems and guides into the intake manifold and then into the
cylinder where it will be burned.
8. Bent or Misaligned Connecting Rods
Bent or misaligned connecting rods will not allow the pistons to ride straight in the cylinders. This will
prevent the pistons and rings from forming a proper seal with the cylinder walls and promote oil
consumption. In addition, it is possible that a bearing in a bent connect rod will not have uniform
clearance on the connecting rod wrist pin. Under these conditions, the bearing will wear rapidly and
throw off an excessive amount of oil into the cylinder.
9. Fuel Dilution
If raw fuel is allowed to enter the lubrication system, the oil will become thinner and more volatile and
will result in higher oil consumption. The following conditions will lead to higher oil consumption;
Excess fuel can enter and mix with the oil via a leaking fuel injector
Gasoline contaminated with diesel fuel
Restricted air intake
Excessive idling
10. Contaminated Cooling Systems
Corrosion, rust, scale, sediment or other formations in the water jacket and radiator will prevent a cooling
system from extracting heat efficiently. This is likely to cause cylinder distortion thus leading to higher
oil consumption.
2012 Jeep Patriot Limited
2012 ENGINE 2.0L - Service Information - Compass & Patriot
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The JEEP Patriot Service Repair Manual 2008-2012 is a comprehensive guide tailored for owners of JEEP Patriot vehicles manufactured between 2008 and 2012. It offers detailed information and step-by-step instructions for repairing and maintaining your vehicle.
Whether you are a professional mechanic or a DIY enthusiast, this service repair manual is designed to meet your needs. It provides assistance in diagnosing and resolving issues with your JEEP Patriot, ensuring optimal performance and longevity.
The JEEP Patriot Service Repair Manual 2008-2012 includes:
- Complete and detailed information on engine, transmission, suspension, electrical system, and more
- Diagnostic procedures to identify various problems and malfunctions
- Step-by-step instructions for repairing and replacing components
- Wiring diagrams and illustrations for easy understanding
- Recommended maintenance schedules to keep your JEEP Patriot in top shape
This service repair manual empowers you to save time and money by performing repairs and maintenance tasks on your own. It eliminates the need for expensive visits to the dealership or mechanic, giving you control over your vehicle's maintenance.
Invest in the JEEP Patriot Service Repair Manual 2008-2012 today to ensure the reliability and proper maintenance of your JEEP Patriot for years to come.
