Distributor Cap Resistance Test-2.5L; Engine Coolant Temperature Sensor; Failure To Start Test-2.5L; Ignition Timing Procedure - Chrysler Stratus RHD 1997 Interactive Electronic Service Manual

8D - 14 IGNITION SYSTEM
DIAGNOSIS AND TESTING (Continued)
light did not flash, the cause of the no-start is in
either the crankshaft position sensor/camshaft posi-
tion sensor 8 volt supply circuit, or the camshaft
position sensor output or ground circuits.
FAILURE TO START TEST—2.5L
NOTE: Before proceeding with this test make sure
Testing For Spark At Coil has been performed. Fail-
ure to do this may lead to unnecessary diagnostic
time and wrong test results.
Refer to Group 25 for On-Board Diagnostic checks.
Also, refer to the DRB scan tool and the appropriate
Powertrain Diagnostic Procedures manual. These
checks will help diagnose problems with the PCM
and ASD relay.

IGNITION TIMING PROCEDURE

The engines for this vehicle, use a fixed ignition
system. The PCM regulates ignition timing. Basic
ignition timing is not adjustable.
CAMSHAFT POSITION SENSOR AND CRANKSHAFT
POSITION SENSOR
The output voltage of a properly operating cam-
shaft position sensor or crankshaft position sensor
switches from high (5.0 volts) to low (0.3 volts). By
connecting an Moper Diagonostic System (MDS) and
engine analyzer to the vehicle, technicians can view
the square wave pattern.
DISTRIBUTOR CAP RESISTANCE TEST—2.5L
There is a resistor built into the distributor cap.
Connect an ohmmeter between the center button and
igntion coil terminal. Ohmmeter should read 5000
ohms.

ENGINE COOLANT TEMPERATURE SENSOR

Refer to Group 14, Fuel System for Diagnosis and
Testing.

INTAKE AIR TEMPERATURE SENSOR

Refer to Group 14, Fuel System, for Diagnosis and
Testing.
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
TEST
Refer to Group 14, Fuel System for Diagnosis and
Testing.
THROTTLE POSITION SENSOR
To perform a complete test of the this sensor and
its circuitry, refer to the DRB scan tool and appropri-
ate Powertrain Diagnostics Procedures manual. To
NORMAL DRY DEPOSITS
test the throttle position sensor only, refer to the fol-
lowing:
The Throttle Position Sensor (TPS) can be tested
with a digital voltmeter (DVM). The center terminal
of the sensor is the output terminal. One of the other
terminals is a 5 volt supply and the remaining ter-
minal is ground.
Connect the DVM between the center and sensor
ground terminal. Refer to Group 8W - Wiring Dia-
grams for correct pinout.
With the ignition switch in the ON position, check
the output voltage at the center terminal wire of the
connector. Check the output voltage at idle and at
Wide-Open-Throttle (WOT). At idle, TPS output volt-
age should be approximately 0.38 volts to 1.2 volts.
At wide open throttle, TPS output voltage should be
approximately 3.1 volts to 4.4 volts. The output volt-
age should gradually increase as the throttle plate
moves slowly from idle to WOT.
Check for spread terminals at the sensor and PCM
connections before replacing the TPS.

SPARK PLUG CONDITION

NORMAL OPERATING CONDITIONS
The few deposits present will be probably light tan
or slightly gray in color with most grades of commer-
cial gasoline (Fig. 27). There will not be evidence of
electrode burning. Gap growth will not average more
than approximately 0.025 mm (.001 in) per 1600 km
(1000 miles) of operation for non platinum spark
plugs. Non-platnium spark plugs that have normal
wear can usually be cleaned, have the electrodes filed
and regapped, and then reinstalled.
CAUTION: Never attempt to file the electrodes or
use a wire brush for cleaning platinum spark plugs.
This would damage the platinum pads which would
shorten spark plug life.
Fig. 27 Normal Operation and Cold (Carbon)Fouling
BLACK COLD (CARBON) FOULING
JA