2012 ENGINE
3.6L - Service Information - Journey
DESCRIPTION
DESCRIPTION
Fig. 1: 3.6L (219.7 CID) Flexible Fuel V - 6 Engine
Courtesy of CHRYSLER GROUP, LLC
The 3.6 liter (219.7 CID) flexible fuel V-6 engine features Variable Valve Timing (VVT), Dual Overhead
Camshafts (DOHC) and a high-pressure die-cast aluminum cylinder block with steel liners in a 60°
configuration. The 3.6 liter engine has a chain driven variable discharge oil pump with a two-stage pressure
regulator for improved fuel economy. The exhaust manifolds are integrated into the cylinder heads for reduced
weight. The cylinders are numbered from front to rear. The right bank is numbered 1, 3, 5 and the left bank is
numbered 2, 4, 6. The firing order is 1-2-3-4-5-6. The engine serial number is located on the left side of the
cylinder block at the transmission flange.
DIAGNOSIS AND TESTING
ENGINE DIAGNOSIS - INTRODUCTION
NOTE: RWD engine configuration shown in illustration, FWD similar.
2012 Dodge Journey R/T
2012 ENGINE 3.6L - Service Information - Journey
2012 Dodge Journey R/T
2012 ENGINE 3.6L - Service Information - Journey
Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by routine
maintenance.
These malfunctions may be classified as either performance (e.g., engine idles rough and stalls) or mechanical
(e.g., a strange noise).
Refer to ENGINE PERFORMANCE DIAGNOSTIC TABLE and ENGINE MECHANICAL
DIAGNOSTIC TABLE for possible causes and corrections of malfunctions.
Refer to FUEL SYSTEM article, for the fuel system diagnosis.
Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that can not be
isolated with the Service Diagnosis charts. Information concerning additional tests and diagnosis is provided
within the following diagnosis:
Cylinder Compression Pressure Test. Refer to CYLINDER COMPRESSION PRESSURE
LEAKAGE .
Cylinder Combustion Pressure Leakage Test. Refer to CYLINDER COMBUSTION PRESSURE
LEAKAGE .
Engine Cylinder Head Gasket Failure Diagnosis. Refer to CYLINDER HEAD GASKET .
Intake Manifold Leakage Diagnosis. Refer to DIAGNOSIS AND TESTING - INTAKE MANIFOLD
LEAKS .
ENGINE PERFORMANCE DIAGNOSTIC TABLE
CONDITION POSSIBLE CAUSE CORRECTION
ENGINE WILL NOT
START
1. Weak battery 1. Charge or replace as necessary. Refer to
BATTERY, DIAGNOSIS AND TESTING .
2. Corroded or loose
battery connections.
2. Clean and tighten battery connections. Refer to
CLEANING .
3. Faulty engine starting
system.
3. Diagnose engine starting system. Refer to
DIAGNOSIS AND TESTING .
4. Faulty coil or control
unit.
4. Replace ignition coil. Refer to COIL,
IGNITION, REMOVAL .
5. Incorrect spark plug
gap.
5. Correct as necessary.
6. Incorrect cam timing. 6. Verify cam timing. Refer to Engine/Valve
Timing - Standard Procedure .
7. Dirt or water in fuel
system.
7. Clean fuel system.
8. Faulty fuel pump or
wiring.
8. Repair or replace as necessary.
9. Faulty Camshaft
Position (CMP) sensor.
9. Replace sensor. Refer to SENSOR,
CAMSHAFT POSITION, REMOVAL .
10. Faulty Crankshaft 10. Replace sensor. Refer to SENSOR,
2012 Dodge Journey R/T
2012 ENGINE 3.6L - Service Information - Journey
ENGINE MECHANICAL DIAGNOSTIC TABLE
Position (CKP) sensor. CRANKSHAFT POSITION, REMOVAL .
ENGINE STALLS OR
ROUGH IDLE
1. Vacuum leak. 1. Inspect intake manifold and vacuum hoses, repair
or replace as necessary.
2. Faulty Crankshaft
Position (CKP) sensor.
2. Replace sensor. Refer to SENSOR,
CRANKSHAFT POSITION, REMOVAL .
3. Faulty ignition coil. 3. Replace ignition coil. Refer to COIL,
IGNITION, REMOVAL .
4. Incorrect cam timing. 4. Verify cam timing. Refer to Engine/Valve
Timing - Standard Procedure .
ENGINE LOSS OF
POWER
1. Dirty or incorrectly
gapped spark plugs.
1. Correct as necessary. Refer to SPARK PLUG,
REMOVAL .
2. Dirt or water in fuel
system.
2. Clean fuel system.
3. Faulty fuel pump. 3. Replace fuel pump. Refer to MODULE, FUEL
PUMP, REMOVAL .
4. Leaking cylinder
head gasket.
4. Replace cylinder head gasket. Refer to
CYLINDER HEAD, REMOVAL .
5. Low compression. 5. Determine the cause and repair as necessary.
Refer to CYLINDER COMBUSTION
PRESSURE LEAKAGE .
6. Burned, warped or
pitted valves.
6. Replace as necessary. Refer to VALVES,
INTAKE AND EXHAUST, REMOVAL .
7. Plugged or restricted
exhaust system.
7. Inspect and replace as necessary.
8. Faulty ignition coil. 8. Replace ignition coil. Refer to COIL,
IGNITION, REMOVAL .
9. Incorrect cam timing. 9. Verify cam timing. Refer to Engine/Valve
Timing - Standard Procedure .
ENGINE MISSES ON
ACCELERATION
1. Dirty or incorrectly
gapped spark plugs.
1. Correct as necessary. Refer to SPARK PLUG,
REMOVAL .
2. Dirt in fuel system. 2. Clean fuel system.
3. Burned, warped or
pitted valves.
3. Replace as necessary. Refer to VALVES,
INTAKE AND EXHAUST, REMOVAL .
4. Faulty ignition coil. 4. Replace ignition coil. Refer to COIL,
IGNITION, REMOVAL .
ENGINE MISSES AT
HIGH SPEED
1. Dirty or incorrectly
gapped spark plugs.
1. Correct as necessary. Refer to SPARK PLUG,
REMOVAL .
4. Faulty ignition coil. 2. Replace ignition coil. Refer to COIL,
IGNITION, REMOVAL .
3. Dirt or water in fuel
system.
3. Clean fuel system.
2012 Dodge Journey R/T
2012 ENGINE 3.6L - Service Information - Journey
CYLINDER COMPRESSION PRESSURE LEAKAGE
CONDITION POSSIBLE CAUSES CORRECTIONS
NOISY VALVES 1. High or low oil level in
crankcase.
1. Refer to Engine/Lubrication/OIL -
Standard Procedure .
2. Thin or diluted oil. 2. Change oil and filter.
3. Low oil pressure. 3. Check oil pump, if Ok, check rod and
main bearings for excessive wear.
4. Dirt in lash adjusters. 4. Replace as necessary.
5. Worn rocker arms. 5. Replace as necessary.
6. Worn lash adjusters 6. Replace as necessary.
7. Worn valve guides. 7. Inspect the valve guides for wear,
cracks or looseness. If either condition
exists, replace the cylinder head. Refer
to CYLINDER HEAD, REMOVAL .
8. Excessive runout of valve
seats on valve faces.
8. Refer to VALVES, INTAKE AND
EXHAUST, STANDARD
PROCEDURE .
CONNECTING ROD NOISE 1. Insufficient oil supply. 1. Refer to Engine/Lubrication/OIL -
Standard Procedure .
2. Low oil pressure. 2. Check oil pump, if OK, check rod and
main bearings for excessive wear.
3. Thin or diluted oil. 3. Change oil and filter.
4. Excessive bearing clearance. 4. Replace as necessary.
5. Connecting rod journal out-
of-round.
5. Service or replace crankshaft.
6. Misaligned connecting rods. 6. Replace bent connecting rods.
MAIN BEARING NOISE 1. Insufficient oil supply. 1. Refer to Engine/Lubrication/OIL -
Standard Procedure .
2. Low oil pressure. 2. Check oil pump, if OK, check rod and
main bearings for excessive wear.
3. Thin or diluted oil. 3. Change oil and filter.
4. Excessive bearing clearance. 4. Replace as necessary.
5. Excessive end play. 5. Check thrust washers for wear.
6. Crankshaft journal out-of
round.
6. Service or replace crankshaft.
7. Loose flywheel or torque
converter.
7. Tighten to correct torque
NOTE: The results of a cylinder compression pressure test can be utilized to diagnose
several engine malfunctions.
NOTE: Ensure the battery is completely charged and the engine starter motor is in
good operating condition. Otherwise the indicated compression pressures may
2012 Dodge Journey R/T
2012 ENGINE 3.6L - Service Information - Journey
1. Clean the spark plug recesses with compressed air.
2. Remove the spark plugs and record the cylinder number of each spark plug for future reference.
3. Inspect the spark plug electrodes for abnormal firing indicators such as fouled, hot, oily, etc.
4. Disable the fuel system and perform the fuel system pressure release procedure. Refer to FUEL
SYSTEM PRESSURE RELEASE PROCEDURE .
5. Insert a compression pressure gauge and rotate the engine with the engine starter motor for three
revolutions.
6. Record the compression pressure on the 3rd revolution. Continue the test for the remaining cylinders.
7. Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cylinder
to cylinder.
8. If one or more cylinders have abnormally low compression pressures, repeat the compression test.
9. If one or more cylinders continue to have abnormally low compression pressures, perform the cylinder
combustion pressure leakage test. Refer to CYLINDER COMBUSTION PRESSURE LEAKAGE .
CYLINDER COMBUSTION PRESSURE LEAKAGE
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 radiator cap.
2. Start and operate the engine until it attains normal operating temperature, then turn the engine OFF.
3. Remove the spark plugs.
4. Remove the oil filler cap.
5. Remove the air cleaner hose.
6. Calibrate the tester according to the manufacturer's instructions. The shop air source for testing should
not be valid for diagnosis purposes.
NOTE: 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.
NOTE: 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.
2012 Dodge Journey R/T
2012 ENGINE 3.6L - Service Information - Journey
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Description
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