timing belt DODGE NEON 2000 Service Owner's Guide

DESCRIPTION SPECIFICATION
Exhaust 5.906±5.924 mm
(0.2326±0.2333 in.)
Valve Stem to Guide Clearance
Intake 0.048±0.066 mm
(0.0018±0.0025 in.)
Max. Allowable 0.076 mm
(0.003 in.)
Service Limit 0.25 mm
(0.010 in.)
Exhaust 0.0736±0.094 mm
(0.0029±0.0037 in.)
Max. Allowable 0.101 mm
(0.004 in.)
Service Limit 0.25 mm
(0.010 in.)
Valve Springs
Free Length (Approx.) 46.75 mm
(1.84 in.)
Nominal Force (Valve
Closed)331 N @ 39.8 mm
(70 lbs. @ 1.57 in.)
Nominal Force (Valve
Open)711 N @ 32.6 mm
(160 lbs. @ 1.28 in.)
Installed Height 40.18 mm
(1.580 in.)
TORQUE
DESCRIPTION N´mFt.
Lbs.In.
Lbs.
Camshaft Sensor
Pick-upÐBolts9.6 Ð 85
Camshaft SprocketÐBolt 115 85 Ð
Connecting Rod
CapÐBolts27 +
1¤4
turn20 +
1¤4
turnÐ
Structural CollarÐBolts Refer to Procedure
Crankshaft Main Bearing
Cap/Bedplate
ÐM8 Bolts 34 25 Ð
ÐM11 Bolts 81 60 Ð
Crankshaft Damper 136 100 Ð
Cylinder HeadÐBolts Refer to Procedure
Cylinder Head CoverÐ
Bolts12 Ð 105
DESCRIPTION N´mFt.
Lbs.In.
Lbs.
Drive Plate to Crankshaft 95 70 Ð
Engine Mount Bracket
RightÐBolts61 45 Ð
Engine Mounting Refer to Procedure
Exhaust Manifold to
Cylinder HeadÐBolts23 Ð 200
Exhaust Manifold Support
Bracket (Federal and
LEV)
ÐM8 Nut 28 Ð 250
ÐM10 Bolt 54 40 Ð
ÐM12 Bolt 95 70 Ð
Exhaust Manifold Support
Bracket (ULEV)54 40 Ð
Engine Torque Strut
Bracket to EngineÐBolts61 45 Ð
Powertrain Bending
StrutÐFront
ÐLong Bolts 101 75 Ð
ÐShort Bolts 61 45 Ð
Intake ManifoldÐBolts 12 Ð 105
Oil Filter Adaptor 80 60 Ð
Oil Filter 20 15 Ð
Oil PanÐBolts 12 Ð 105
Oil Pan DrainÐPlug 27 20 Ð
Oil Pump to Block 28 Ð 250
Oil Pump Cover
PlateÐBolts12 Ð 105
Oil Pump Pick-up
TubeÐBolt28 Ð 250
Oil Pump Relief
ValveÐCap41 30 Ð
PCV Valve 5.6 Ð 50
Rocker Arm ShaftÐBolts 28 Ð 250
Spark Plugs 28 Ð 250
Timing Belt CoverÐBolts 12 Ð 105
Timing Belt Tensioner
AssemblyÐBolts28 Ð 250
Water PumpÐBolts 12 Ð 105
PL2.0L SOHC ENGINE 9 - 71
SPECIFICATIONS (Continued)

signal to the PCM, allowing engine starter operation.
The interlock switch is not adjustable.
Clutch Pedal Upstop Switch
With the clutch pedal at rest, the clutch pedal
upstop switch is closed, allowing speed control oper-
ation. When the clutch pedal is depressed, the upstop
switch opens and signals the PCM to cancel speed
control operation, and enter a modified engine cali-
bration schedule to improve driveability during gear-
to-gear shifts. The upstop switch is not adjustable.
CRANKSHAFT POSITION SENSORÐPCM
INPUT
DESCRIPTION
The crankshaft position sensor mounts to the front
of the engine block (Fig. 8).
OPERATION
The PCM determines what cylinder to fire from the
crankshaft position sensor input and the camshaft
position sensor input. The second crankshaft counter-
weight has two sets of four timing reference notches
including a 60 degree signature notch (Fig. 9). From
the crankshaft position sensor input the PCM deter-
mines engine speed and crankshaft angle (position).
The notches generate pulses from high to low in
the crankshaft position sensor output voltage. When
a metal portion of the counterweight aligns with the
crankshaft position sensor, the sensor output voltage
goes low (less than 0.5 volts). When a notch aligns
with the sensor, voltage goes high (5.0 volts). As a
group of notches pass under the sensor, the output
voltage switches from low (metal) to high (notch)
then back to low.If available, an oscilloscope can display the square
wave patterns of each voltage pulses. From the width
of the output voltage pulses, the PCM calculates
engine speed. The width of the pulses represent the
amount of time the output voltage stays high before
switching back to low. The period of time the sensor
output voltage stays high before switching back to
low is referred to as pulse width. The faster the
engine is operating, the smaller the pulse width on
the oscilloscope.
By counting the pulses and referencing the pulse
from the 60 degree signature notch, the PCM calcu-
lates crankshaft angle (position). In each group of
timing reference notches, the first notch represents
69 degrees before top dead center (BTDC). The sec-
ond notch represents 49 degrees BTDC. The third
notch represents 29 degrees. The last notch in each
set represents 9 degrees before top dead center
(TDC).
The timing reference notches are machined at 20É
increments. From the voltage pulse width the PCM
tells the difference between the timing reference
notches and the 60 degree signature notch. The 60
degree signature notch produces a longer pulse width
than the smaller timing reference notches. If the
camshaft position sensor input switches from high to
low when the 60 degree signature notch passes under
the crankshaft position sensor, the PCM knows cylin-
der number one is the next cylinder at TDC.
The PCM uses the Crankshaft Position sensor to
calculate the following: Engine RPM, TDC number 1
and 4, Ignition coil synchronization, Injection Syn-
chronization, Camshaft-to-crankshaft misalignment
where applicable (Timing belt skipped 1 tooth or
more diagnostic trouble code).
The PCM sends approximately 9 volts to the Hall-
effect sensor. This voltage is required to operate the
Hall-effect chip and the electronics inside the sensor.
A ground for the sensor is provided through the sen-
sor return circuit. The input to the PCM occurs on a
5 volt output reference circuit.
ENGINE COOLANT TEMPERATURE SENSORÐ
PCM INPUT
DESCRIPTION
The coolant sensor threads into the rear of the cyl-
inder head, next to the camshaft position sensor (Fig.
10). New sensors have sealant applied to the threads.
The ECT Sensor is a Negative Thermal Coefficient
(NTC), dual range Sensor. The resistance of the ECT
Sensor changes as coolant temperature changes. This
results in different input voltages to the PCM. The
PCM also uses the ECT Sensor input to operate the
low and high speed radiator cooling fans.
Fig. 8 Crankshaft Position Sensor
14 - 30 FUEL SYSTEMPL
DESCRIPTION AND OPERATION (Continued)

(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was recorded.
P1292 CNG Pressure Sensor Voltage Too
HighCompressed natural gas pressure sensor reading above
acceptable voltage.
P1293 CNG Pressure Sensor Voltage Too
LowCompressed natural gas pressure sensor reading below
acceptable voltage.
P1294 (M) Target Idle Not Reached Target RPM not achieved during drive idle condition.
Possible vacuum leak or IAC (AIS) lost steps.
P1295 No 5 Volts to TP Sensor Loss of a 5 volt feed to the Throttle Position Sensor has
been detected.
P1296 No 5 Volts to MAP Sensor Loss of a 5 volt feed to the MAP Sensor has been
detected.
P1297 (M) No Change in MAP From Start To
RunNo difference is recognized between the MAP reading
at engine idle and the stored barometric pressure
reading.
P1298 Lean Operation at Wide Open
ThrottleA prolonged lean condition is detected during Wide
Open Throttle.
P1299 (M) Vacuum Leak Found (IAC Fully
Seated)MAP Sensor signal does not correlate to Throttle
Position Sensor signal. Possible vacuum leak.
P1388 Auto Shutdown Relay Control
CircuitAn open or shorted condition detected in the ASD or
CNG shutoff relay control ckt.
P1389 No ASD Relay Output Voltage At
PCMNo Z1 or Z2 voltage sensed when the auto shutdown
relay is energized.
P1390 (M) Timing Belt Skipped 1 Tooth or
MoreRelationship between Cam and Crank signals not
correct.
P1391 (M) Intermittent Loss of CMP or CKP Loss of the Cam Position Sensor or Crank Position
sensor has occurred. For PL 2.0L
P1398 (M) Mis-Fire Adaptive Numerator at
LimitPCM is unable to learn the Crank Sensor's signal in
preparation for Misfire Diagnostics. Probable defective
Crank Sensor.
P1399 Wait To Start Lamp Cicuit An open or shorted condition detected in the Wait to
Start Lamp circuit.
P1403 No 5 Volts to EGR Sensor Loss of 5v feed to the EGR position sensor.
P1476 Too Little Secondary Air Insufficient flow of secondary air injection detected
during aspirator test.(was P0411)
P1477 Too Much Secondary Air Excessive flow of secondary air injection detected
during aspirator test (was P0411).
P1478 (M) Battery Temp Sensor Volts Out of
LimitInternal temperature sensor input voltage out of an
acceptable range.
P1479 Transmission Fan Relay Circuit An open or shorted condition detected in the
transmission fan relay circuit.
P1480 PCV Solenoid Circuit An open or shorted condition detected in the PCV
solenoid circuit.
P1482 Catalyst Temperature Sensor Circuit
Shorted LowCatalyst temperature sensor circuit shorted low.
P1483 Catalyst Temperature Sensor Circuit
Shorted High.Catalyst temperature sensor circuit shorted high.
P1484 Catalytic Converter Overheat
DetectedA catalyst overheat condition has been detected by the
catalyst temperature sensor.
25 - 12 EMISSION CONTROL SYSTEMSPL
DESCRIPTION AND OPERATION (Continued)