Chrysler Town & Country/Voyager, Dodge Caravan, Plymouth Voyager. Manual - part 206
the coil between the towers of each individual coil (Fig.
4). Secondary resistance should be 7,000 to 15,800
ohms. Replace the coil if resistance is not within
tolerance.
FAILURE TO START TEST
This no-start test checks the camshaft sensor and
crankshaft sensor.
The engine controller supplies 9 volts to the camshaft
sensor and crankshaft sensor through one circuit. If
the 9-volt supply circuit is shorted to ground, neither
sensor will produce a signal (output voltage to the
engine controller).
When the ignition key is turned and left in the On
position, the engine controller automatically energizes
the auto shutdown (ASD) relay. However, the controller
de-energizes the relay within one second because it has
not received a crankshaft signal indicating engine
rotation.
During cranking, the ASD relay will not energize
until the engine controller receives a crankshaft signal.
Secondly, the ASD relay remains energized only if the
controller senses a camshaft sensor signal immediately
after detecting the crankshaft sensor signal.
(1) Check battery voltage. Voltage should approxi-
mately 12.66 volts or higher to perform failure to start
test.
(2) Disconnect the harness connector from the coil
pack (Fig. 2).
(3) Connect a test light to the B+ (battery voltage)
terminal of the coil electrical connector and ground.
The wire for the B+ terminal is dark green with a black
tracer.
(4) Turn the ignition key to the ON position. The
test light should flash On and then Off. Do not turn
the Key to off position, leave it in the On position.
(a) If the test light flashes momentarily, the engine
controller grounded the auto shutdown (ASD) relay.
Proceed to step 5.
(b) If the test light did not flash, the ASD relay did
not energize. The cause is either the relay or one of
the relay circuits. Use the DRB II to test the ASD
relay and circuits. Refer to the appropriate Power-
train Diagnostics Procedure Manual. Refer to the
wiring diagrams section for circuit information.
(5) Crank the engine. (If the key was placed in the
off position after step 4, place the key in the On
position before cranking. Wait for the test light to flash
once, then crank the engine.)
(a) If the test light momentarily flashes during
cranking, the engine controller is not receiving a
camshaft sensor signal. Use the DRB II to test the
camshaft sensor and sensor circuits. Refer to the
appropriate
Powertrain
Diagnostics
Procedure
Manual. Refer to the wiring diagrams section for
circuit information.
(b) If the test light did not flash during cranking,
unplug the camshaft sensor connector. Turn the
ignition key to the off position. Turn the key to the
On position, wait for the test light to momentarily
flash once, then crank the engine. If the test light
momentarily flashes, the camshaft sensor is shorted
and must be replaced. If the light did not flash, the
cause of the no-start is in either the crankshaft
sensor/camshaft sensor 9-volt supply circuit, or the
crankshaft sensor 5-volt output or ground circuits.
Use the DRB II to test the crankshaft sensor and the
sensor circuits. Refer to the appropriate Powertrain
Diagnostics Procedure Manual. Refer to the wiring
diagrams section for circuit information.
COOLANT TEMPERATURE SENSOR TEST
(1) With key off, disconnect wire connector from
coolant temperature sensor (Fig. 5).
(2) Connect one lead of ohmmeter to one terminal of
coolant temperature sensor.
Fig. 4 Checking Ignition Coil Secondary Resistance
Fig. 5 Coolant Temperature Sensor Test
.
IGNITION SYSTEMS
8D - 33