oil temperature CHRYSLER CARAVAN 2002 Workshop Manual
[x] Cancel search | Manufacturer: CHRYSLER, Model Year: 2002, Model line: CARAVAN, Model: CHRYSLER CARAVAN 2002Pages: 2399, PDF Size: 57.96 MB
Page 1086 of 2399
ENGINE CONTROL MODULE C1 (DIESEL) - BLACK 81 WAY
CAV CIRCUIT FUNCTION
1 Z130 14BK/BR GROUND
2 Z131 14BK/DG GROUND
3 K20 14BR/GY GENERATOR FIELD CONTROL
4 K342 14BR/WT ECM/PCM RELAY OUTPUT
5 K342 14BR/WT ECM/PCM RELAY OUTPUT
6- -
7 D25 20WT/VT PCI BUS
8 K944 20BK/GY CAMSHAFT POSITION SENSOR SHIELD GROUND
9 K44 20DB/GY CAMSHAFT POSITION SENSOR SIGNAL
10 - -
11 K37 20DB/YL BOOST PRESSURE SENSOR SIGNAL
12 K55 20DB/OR MASS AIR FLOW SENSOR SIGNAL
13 K78 20GY FUEL PRESSURE SENSOR SIGNAL
14 - -
15 K22 20OR/DB ACCELERATOR PEDAL POSITION SENSOR SIGNAL
16 K80 20DB/TN FUEL PRESSURE SENSOR GROUND
17 - -
18 - -
19 N1 20DB/OR FUEL HEATER RELAY OUTPUT
20 Z138 20BK/OR GROUND
21 K900 20DB/DG SENSOR GROUND
22 F202 20PK/GY FUSED IGNITION SWITCH OUTPUT (RUN-START)
23 F851 20LB/PK SENSOR REFERENCE VOLTAGE B
24 K3 20BR/OR CRANKSHAFT POSITION SENSOR SIGNAL NO. 1
25 - -
26 - -
27 - -
28 - -
29 - -
30 G6 20VT/GY ENGINE OIL PRESSURE SENSOR SIGNAL
31 F853 20LG/PK WATER IN FUEL SENSOR SIGNAL
32 K25 20BR/TN BATTERY TEMPERATURE SENSOR SIGNAL
33 - -
34 K167 20BR/YL ACCELERATOR PEDAL POSITION SENSOR GROUND
35 K853 20DB/BR ACCELERATOR PEDAL POSITION SENSOR 5 VOLT
SUPPLY
36 C18 20LB/BR A/C PRESSURE SENSOR SIGNAL
37 K89 20DB/WT ENGINE OIL TEMPERATURE SENSOR SIGNAL
38 V37 20VT/TN SPEED CONTROL SWITCH SIGNAL
39 - -
40 K2 20TN/BK ENGINE COOLANT TEMPERATURE SENSOR SIGNAL
41 K21 20DB/LG INTAKE AIR TEMPERATURE SENSOR SIGNAL
42 Z122 18WT GROUND (DRAIN)
43 K24 20BR/LB CRANKSHAFT POSITION SENSOR SIGNAL NO. 2
44 - -
45 - -
46 - -
47 L50 20WT/TN BRAKE LAMP SWITCH OUTPUT
48 B29 20DG/WT SECONDARY BRAKE SWITCH SIGNAL
49 T751 20YL FUSED IGNITION SWITCH OUTPUT (START)
50 F855 20PK/YL SENSOR REFERENCE VOLTAGE A
51 - -
52 K121 20DB BOOST PRESSURE SENSOR GROUND
53 - -
54 K957 20BK/OR MASS AIR FLOW SENSOR GROUND
RS8W-80 CONNECTOR PIN-OUTS8W-80-55
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ENGINE COOLANT TEMP SENSOR (GAS) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 K900 18DB/DG SENSOR GROUND
2 K2 18VT/OR ENGINE COOLANT TEMPERATURE SENSOR SIGNAL
ENGINE OIL PRESSURE SENSOR (DIESEL) - BLACK 3 WAY
CAV CIRCUIT FUNCTION
1 F855 20PK/YL SENSOR REFERENCE VOLTAGE A
2 G6 20VT/GY ENGINE OIL PRESSURE SENSOR SIGNAL
3 K936 20BR/YL ENGINE OIL PRESSURE SENSOR GROUND
ENGINE OIL PRESSURE SWITCH (GAS) - LT. GREEN 2 WAY
CAV CIRCUIT FUNCTION
1 G6 16VT/GY ENGINE OIL PRESSURE SWITCH SENSE
2- -
ENGINE OIL TEMPERATURE SENSOR (DIESEL) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 K89 20DB/WT ENGINE OIL TEMPERATURE SENSOR SIGNAL
2 K900 20DB/OR SENSOR GROUND
EVAP/PURGE SOLENOID (GAS) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 K52 18DB/WT EVAPORATIVE EMISSION SOLENOID CONTROL
2 K70 18DB/BR EVAPORATIVE EMISSION SOLENOID SENSE
8W - 80 - 58 8W-80 CONNECTOR PIN-OUTSRS
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IDLE AIR CONTROL MOTOR (3.3L/3.8L) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 K39 18VT/DG IDLE AIR CONTROL NO. 1 DRIVER
2 K60 18VT/LG IDLE AIR CONTROL NO. 2 DRIVER
IGNITION COIL (2.4L) - BLACK 3 WAY
CAV CIRCUIT FUNCTION
1 K17 16DB/TN IGNITION COIL NO. 2 DRIVER
2 K342 16BR/WT AUTOMATIC SHUT DOWN RELAY OUTPUT
3 K19 16DB/DG IGNITION COIL NO. 1 DRIVER
IGNITION COIL (3.3L/3.8L) - DK. GRAY 4 WAY
CAV CIRCUIT FUNCTION
1 K18 16DB/OR IGNITION COIL NO. 3 DRIVER
2 K342 16BR/WT AUTOMATIC SHUT DOWN RELAY OUTPUT
3 K19 16DB/DG IGNITION COIL NO. 1 DRIVER
4 K17 16DB/TN IGNITION COIL NO. 2 DRIVER
IGNITION SWITCH - BLACK 5 WAY
CAV CIRCUIT FUNCTION
1 G900 20VT/OR IGNITION SWITCH SENSE RETURN
2 G20 20VT/BR IGNITION SWITCH SENSE
3 F20 20PK/WT (LHD) FUSED IGNITION SWITCH OUTPUT (RUN-START)
3 F20 20PK/WT FUSED IGNITION SWITCH OUTPUT (RUN-START)
4 T751 20YL FUSED IGNITION SWITCH OUTPUT (START)
5 A106 20LB/RD FUSED B(+)
INLET AIR TEMPERATURE SENSOR - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 K21 18DB/LG INTAKE AIR TEMPERATURE SENSOR SIGNAL
2 K900 18DB/DG SENSOR GROUND
RS8W-80 CONNECTOR PIN-OUTS8W-80-65
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POWER WINDOW SWITCH (LOWLINE) - BLACK 8 WAY
CAV CIRCUIT FUNCTION
1 F304 16WT/PK FUSED WINDOW CIRCUIT BREAKER OUTPUT
2 Z421 12BK/BR GROUND
3 Z421 12BK/BR GROUND
4- -
5 Q26 12OR/GY MASTER WINDOW SWITCH PASSENGER DOWN
6 F304 16WT/PK FUSED WINDOW CIRCUIT BREAKER OUTPUT
7 Z421 20BK/BR GROUND
8 Q16 12OR/TN MASTER WINDOW SWITCH PASSENGER UP
POWERTRAIN CONTROL MODULE C1 (GAS) - GRAY/BLACK 40-WAY
CAV CIRCUIT FUNCTION
1- -
2 K18 16DB/OR (3.3L/3.8L) IGNITION COIL NO. 3 DRIVER
3 K17 16DB/TN IGNITION COIL NO. 2 DRIVER
4- -
5 V32 18VT/YL SPEED CONTROL ON/OFF SWITCH SENSE
6 K342 16BR/WT AUTOMATIC SHUT DOWN RELAY OUTPUT
7 K13 16BR/LB FUEL INJECTOR NO. 3 DRIVER
8 K20 18BR/GY GENERATOR FIELD CONTROL
9- -
10 Z130 18BK/BR GROUND
11 K19 16DB/DG IGNITION COIL NO. 1 DRIVER
12 G6 16VT/GY ENGINE OIL PRESSURE SWITCH SENSE
13 K11 16BR/YL FUEL INJECTOR NO. 1 DRIVER
14 K58 16BR/VT (3.3L/3.8L) FUEL INJECTOR NO. 6 DRIVER
15 K38 16BR/OR (3.3L/3.8L) FUEL INJECTOR NO. 5 DRIVER
16 K14 16BR/TN FUEL INJECTOR NO. 4 DRIVER
17 K12 16BR/DB FUEL INJECTOR NO. 2 DRIVER
18 K99 18BR/LG OXYGEN SENSOR 1/1 HEATER CONTROL
19 - -
20 F202 18PK/GY FUSED IGNITION SWITCH OUTPUT (RUN-START)
21 - -
22 - -
23 - -
24 - -
25 K42 18DB/YL (EXCEPT 3.3L/3.8L
BUILT-UP-EXPORT)KNOCK SENSOR SIGNAL
26 K2 18VT/OR ENGINE COOLANT TEMPERATURE SENSOR SIGNAL
27 K902 18BR/DG OXYGEN SENSOR GROUND
28 - -
29 - -
30 K41 18DB/LB OXYGEN SENSOR 1/1 SIGNAL
31 T752 18DG/OR ENGINE STARTER MOTOR RELAY CONTROL
32 K24 18BR/LB CRANKSHAFT POSITION SENSOR SIGNAL
33 K44 18DB/GY CAMSHAFT POSITION SENSOR SIGNAL
34 - -
35 K22 18BR/OR THROTTLE POSITION SENSOR SIGNAL
36 K1 18VT/BR MANIFOLD ABSOLUTE PRESSURE SENSOR SIGNAL
37 K21 18DB/LG INTAKE AIR TEMPERATURE SENSOR SIGNAL
38 - -
39 - -
40 K35 18DB/VT EGR SOLENOID CONTROL
8W - 80 - 94 8W-80 CONNECTOR PIN-OUTSRS
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Page 1151 of 2399
CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Driver Power Seat Front Riser
MotorRD At Seat N/S
Driver Power Seat Horizontal Motor BK At Seat N/S
Driver Power Seat Rear Riser
MotorRD At Seat N/S
Driver Power Seat Recliner Motor GN At Seat N/S
Driver Power Seat Switch GN At Switch N/S
Driver Power Window Motor RD At Motor N/S
Driver Power Window Switch GN At Switch N/S
Driver Power Window Switch
(RHD)NAT At Switch N/S
Driver Seatbelt Switch WT At Switch on Seat Harness N/S
Driver Seatbelt Tensioner On Seat Harness N/S
EGR Solenoid (Diesel) BK Above Transmission
Right Side of EngineN/S
EGR Solenoid GY Above Transmission
Right Side of Engine9, 10, 11, 13
Electric Wiper De-Icer-C1 WT Right Side Instrument Panel 15, 1923
Electric Wiper De-Icer-C2 WT Left Side Instrument Panel 15, 16, 22
Engine Control Module C1 (Diesel) BK Right Side of Engine 11
Engine Control Module C2 (Diesel) BK Right Side of Engine 11
Engine Coolant Temperature
Sensor (Gas)BK On Cylinder Block N/S
Engine Coolant Temperature
Sensor (Diesel)BL On Cylinder Block 11
Engine Oil Pressure Sensor
(Diesel)BK Rear of Engine 12
Engine Oil Pressure Switch (Gas) LTGN On Cylinder Block 9
Engine Oil Temperature Sensor
(Diesel)BK Rear of Engine 12
EVAP/Purge Solenoid BK Right Motor Mount 9, 13
Evaporator Temperature Sensor BK Right Side of HVAC N/S
Floor Console Lamp BK At Lamp N/S
Floor Console Power Outlet RD At Front Console N/S
Front Blower Module C1 (ATC) BK On HVAC N/S
Front Blower Module C2 (ATC) BK On HVAC N/S
Front Cigar Lighter RD/NAT Rear of Lighter 15, 18, 20
Front Reading Lamps/Switch BK At Switch N/S
Front Washer Pump Motor BK Right Fender Well 3
Fuel Heater (Diesel) BK Left Rear Engine Compartment N/S
Fuel Injector No.1 BK At Fuel Injector N/S
Fuel Injector No.1 (Diesel) BK At Fuel Injector 11
Fuel Injector No.2 BK At Fuel Injector N/S
Fuel Injector No.2 (Diesel) BK At Fuel Injector 11
8W - 91 - 4 8W-91 CONNECTOR/GROUND/SPLICE LOCATIONRS
CONNECTOR/GROUND/SPLICE LOCATION (Continued)
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Page 1152 of 2399
CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Fuel Injector No.3 BK At Fuel Injector N/S
Fuel Injector No.3 (Diesel) BK At Fuel Injector 11
Fuel Injector No.4 BK At Fuel Injector N/S
Fuel Injector No.4 (Diesel) BK At Fuel Injector 11
Fuel Injector No.5 BK At Fuel Injector N/S
Fuel Injector No.6 BK At Fuel Injector N/S
Fuel Pump Module LTGY Side of Fuel Tank N/S
Fuel Pressure Sensor (Diesel) BK Top Left of Engine 11
Generator BK Rear of Generator 10, 11, 13, 14
Glove Box Lamp BL Rear of Glove Box 18, 24
Glow Plug Relay (Diesel) BK Near Battery N/S
Halo Lamp WT Steering Column 15, 16, 17, 18, 26
Headlamp Switch BK Rear of Switch 15, 16, 25
Headlamp Washer Pump Motor At Motor N/S
High Note Horn BK Left Frame Rail 5
High Pressure Fuel Pump (Diesel) Rear of Pump 11
Hood Ajar Switch BK Left Fender 6
Idle Air Control Motor (2.4L) BK On Throttle Body 9
Idle Air Control Motor (3.3/3.8L) BK On Throttle Body 13
Ignition Coil Pack 2.4L BK Top of Valve Cover 9, 10
Ignition Coil Pack 3.3L, 3.8L DKGY Top of Engine 14
Ignition Switch BK Rear of Switch at Steering Column 15, 16, 17, 18, 26
Inlet Air Temperature Sensor BK Top Left of Engine N/S
Instrument Cluster BK Rear of Cluster 15, 16, 23
Instrument Panel Switch Bank BK Right Center of Instrument Panel 15, 18, 20
Instrument Panel Power Outlet NAT Center of Instrument Panel N/S
Integrated Power Module C1 LTGN Left Fender Shield 7
Integrated Power Module C2 GN/BL Left Fender Shield 7
Integrated Power Module C3
(Diesel)YL/RD Left Fender Shield 7
Integrated Power Module C3 (Gas) NAT/RD Left Fender Shield 7
Integrated Power Module C4 BL Left Fender Shield 7
Integrated Power Module C5 BK Left Fender Shield 7
Integrated Power Module C6 NAT Left Fender Shield 7
Integrated Power Module C7 BK/RD Left Fender Shield 7
Integrated Power Module C8 OR Left Fender Shield 7
Integrated Power Module C9 BK Left Fender Shield 7
Knock Sensor GY Front of Cylinder Block N/S
Leak Detection Pump LTGY At Pump 9, 10 14
Left B Pillar Switch GY Left B Pillar 34
Left Cinch/Release Motor GY Left Sliding Door N/S
Left Combination Relay BK Left Rear Quarter Panel N/S
RS8W-91 CONNECTOR/GROUND/SPLICE LOCATION8W-91-5
CONNECTOR/GROUND/SPLICE LOCATION (Continued)
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Page 1158 of 2399
GROUNDS
GROUND NUMBER LOCATION FIG.
G100 Body Ground Near Powertrain Control Module N/S
G101 Above Starter 10
G102 Left Headlamp Area 1
G103 Above Starter 10
G200 Right Side of Instrument Panel 15, 19, 24
G201 Right Side of Instrument Panel 15, 19, 24
G202 Near Radio N/S
G300 Left B Pillar 27
G301 Right B Pillar 28, 33
G302 Left Rear Quarter N/S
G400 Liftgate Ground N/S
SPLICES
SPLICE NUMBER LOCATION FIG.
S101 800mm from T/O for G102 1
S102 500mm from T/O for G102 1
S103 (2.5L) Between T/O for Battery Temperature Sensor and T/O
for C10211
S103 (3.3L/3.8L) Near T/O for C100 N/S
S104 Near T/O for G102 1
S105 (3.3L/3.8L) Near T/O for Battery (+) N/S
S106 (2.4L) 40mm from T/O for Torque Converter Clutch Solenoid 10
S106 (2.5L) Near T/O for Battery Temperature Sensor 11
S106 (3.3L/3.8L) Near T/O for G103 14
S107 (2.4L) In T/O for EGR Solenoid 10
S107 (2.5L) Between T/O for Engine Starter Motor and T/O for
Engine Control Module C112
S107 (3.3L/3.8L) In T/O for EGR Solenoid 14
S108 (3.3L/3.8L) Near T/O for Powertrain Control Module N/S
S109 (3.3L/3.8L) Near T/O for Camshaft Position Sensor N/S
S110 Near T/O to G102 N/S
S111 (2.4L) Near T/O for C101 N/S
S111 (2.5L) Near T/O for Battery (-) N/S
S111 (3.3L/3.8L) Near T/O for Powertrain Control Module N/S
S112 Near T/O for Intelligent Power Module - C3 N/S
S113 (2.4L) Near T/O for Park/Neutral Position Switch N/S
S114 (3.3L/3.8L) In T/O to Transmission Control Module N/S
S115 (3.3L/3.8L) In T/O to Transmission Control Module N/S
S116 (2.4L) 180mm from T/O for Torque Converter Clutch Solenoid 10
S116 (2.5L) Near T/O for Mass Air Flow Sensor 12
S116 (3.3L/3.8L) Near T/O for Ignition Coil Pack 14
RS8W-91 CONNECTOR/GROUND/SPLICE LOCATION8W-91-11
CONNECTOR/GROUND/SPLICE LOCATION (Continued)
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Page 1207 of 2399
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - MECHANICAL
CONDITION POSSIBLE CAUSES CORRECTION
NOISY VALVES 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. Check and correct engine oil
pressure problem.
5. Dirt in hydraulic lifters/lash
adjusters.5. Replace hydraulic lifters/lash
adjusters.
6. Worn rocker arms. 6. Inspect oil supply to rocker arms.
7. Worn hydraulic lifters/lash
adjusters.7. Replace hydraulic lifters/lash
adjusters.
8. Worn valve guides. 8. Replace cylinder head assembly.
9. Excessive runout of valve seats
on valve faces.9. Grind valve seats and 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. Misaligned connecting rods. 7. Replace bent connecting rods.
9 - 6 ENGINE 2.4LRS
ENGINE 2.4L (Continued)
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Page 1208 of 2399
CONDITION POSSIBLE CAUSES CORRECTION
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 sensor/switch. 2. Replace oil pressure sensor/
switch.
3. Low oil pressure. 3. Check oil pressure sensor/switch
and main bearing oil clearance.
4. Clogged oil filter. 4. Install new oil filter.
5. Worn parts in oil pump. 5. Replace worn parts or pump.
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. Oil pump suction tube loose. 8. Remove oil pan and install new
tube or clean, if necessary.
9. Oil pump cover warped or
cracked.9. Install new oil pump.
10. Excessive bearing clearance. 10. 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.
RSENGINE 2.4L9-7
ENGINE 2.4L (Continued)
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Page 1210 of 2399
(3) Remove torque converter or clutch housing
cover and inspect rear of block for evidence of oil.
Use a black light to check for the oil leak. If a leak is
present in this area, remove transmission for further
inspection.
(a) Circular spray pattern generally indicates
seal leakage or crankshaft damage.
(b) Where leakage tends to run straight down,
possible causes are a porous block, oil gallery cup
plug, bedplate to cylinder block mating surfaces
and seal bore. See proper repair procedures for
these items.
(4) If no leaks are detected, pressurize the crank-
case as previously described.
CAUTION: Do not exceed 20.6 kPa (3 psi).
(5) If the leak is not detected, very slowly turn the
crankshaft and watch for leakage. If a leak is
detected between the crankshaft and seal while
slowly turning the crankshaft, it is possible the
crankshaft seal surface is damaged. The seal area on
the crankshaft could have minor nicks or scratches
that can be polished out with emery cloth.
CAUTION: Use extreme caution when crankshaft
polishing is necessary to remove minor nicks and
scratches. The crankshaft seal flange is especially
machined to complement the function of the rear oil
seal.
(6) For bubbles that remain steady with shaft
rotation, no further inspection can be done until dis-
assembled.
(7) After the oil leak root cause and appropriate
corrective action have been identified, replace compo-
nent(s) as necessary.
DIAGNOSIS AND TESTING - CYLINDER
COMPRESSION PRESSURE TEST
The results of a cylinder compression pressure test
can be utilized to diagnose several engine malfunc-
tions.
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 traf-
fic and other forms of congestion, observe all traffic
laws, and accelerate through the gears several times
briskly.
(3) Remove all spark plugs from engine. As spark
plugs are being removed, check electrodes for abnor-
mal firing indicators fouled, hot, oily, etc. Record cyl-
inder number of spark plug for future reference.(4) Remove the Auto Shutdown (ASD) relay from
the PDC.
(5) Be sure throttle blade is fully open during the
compression check.
(6) Insert compression gauge adaptor Special Tool
8116 or the equivalent, into the #1 spark plug hole in
cylinder head. Connect the 0±500 psi (Blue) pressure
transducer (Special Tool CH7059) with cable adap-
tors to the DRBIIIt. For Special Tool identification,
(Refer to 9 - ENGINE - SPECIAL TOOLS).
(7) Crank engine until maximum pressure is
reached on gauge. Record this pressure as #1 cylin-
der pressure.
(8) Repeat the previous step for all remaining cyl-
inders.
(9) Compression should not be less than 689 kPa
(100 psi) and not vary more than 25 percent from cyl-
inder to cylinder.
(10) If one or more cylinders have abnormally low
compression pressures, repeat the compression test.
(11) 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 com-
pression 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 malfunc-
tion is present.
DIAGNOSIS AND TESTING - CYLINDER
COMBUSTION PRESSURE LEAKAGE TEST
The combustion pressure leakage test provides an
accurate means for determining engine condition.
Combustion pressure leakage testing will detect:
²Exhaust and intake valve leaks (improper seat-
ing).
²Leaks between adjacent cylinders or into water
jacket.
²Any causes for combustion/compression pressure
loss.
WARNING: DO NOT REMOVE THE PRESSURE CAP
WITH THE SYSTEM HOT AND UNDER PRESSURE
BECAUSE SERIOUS BURNS FROM COOLANT CAN
OCCUR.
Check the coolant level and fill as required. DO
NOT install the pressure cap.
Start and operate the engine until it attains nor-
mal operating temperature, then turn the engine
OFF.
Clean spark plug recesses with compressed air.
Remove the spark plugs.
Remove the oil filler cap.
Remove the air cleaner.
RSENGINE 2.4L9-9
ENGINE 2.4L (Continued)
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