Chrysler neon 1997 Service Manual page 576

AIR INLET TUBE BATTERY TRAY BATTERY
PL
DIAGNOSIS AND TESTING (Continued)
(24) Inspect the connections to the speed control
servo, if equipped (Fig. 54). Refer to Group 8H, Vehi-
cle Speed Control.
Fig. 76 Battery Temp. Sensor Connectors
(25) Inspect the connection at the battery temper-
ature sensor (Fig. 76).
ASD AND FUEL PUMP RELAYS
The following description of operation and
tests apply only to the Automatic Shutdown
(ASD) and fuel pump relays . The terminals on
the bottom of each relay are numbered (Fig. 77).
Fig. 77 ASD and Fuel Pump Relay Terminals
OPERATION
• Terminal number 30 is connected to battery volt-
age. For both the ASD relay and fuel pump relays,
terminal 30 is connected to battery voltage at all
times.
TEMPERATURE SENSOR
RELAY CAVITIES RELAY TERMINALS
• The Powertrain Control Module (PCM) grounds
the coil side of the relay through terminal number
85.
• Terminal number 86 supplies voltage to the coil
side of the relay.
• When PCM de-energizes the ASD and fuel pump
relays, terminal number 87A connects to terminal 30.
This is the Off position. In the off position, voltage is
not supplied to the rest of the circuit. Terminal 87A
is the center terminal on the relay. There is no wire
or terminal in the cavity.
• When the PCM energies ASD and fuel pump
relays energize, terminal 87 connects to terminal 30.
This is the On position. Terminal 87 supplies voltage
to the rest of the circuit.
TESTING
The following procedure applies to the ASD and
fuel pump relays.
(1) Remove relay from connector before testing.
(2) With the relay removed from the vehicle, use
an ohmmeter to check the resistance between termi-
nals 85 and 86 of the relay. The resistance should be
between 75 5 ohms.
(3) Connect the ohmmeter between relay terminals
30 and 87A of the relay. The ohmmeter should show
continuity between terminals 30 and 87A.
(4) Connect the ohmmeter between relay terminals
87 and 30 of the relay. The ohmmeter should not
show continuity at this time.
(5) Connect one end of a jumper wire (16 gauge or
heavier) to relay terminal 85. Connect the other end
of the jumper wire to the ground side of a 12 volt
power source.
(6) Connect one end of another jumper wire (16
gauge or heavier) to the power side of the 12 volt
power source. Do not attach the other end of the
jumper wire to the relay at this time.
WARNING: DO NOT ALLOW OHMMETER TO CON-
TACT TERMINALS 85 OR 86 DURING THIS TEST.
(7) Attach the other end of the jumper wire to
relay terminal 86. This activates the relay. The ohm-
meter should now show continuity between relay ter-
minals 87 and 30. The ohmmeter should not show
continuity between relay terminals 87A and 30.
(8) Disconnect jumper wires.
(9) Replace the relay if it did not pass the continu-
ity and resistance tests. If the relay passed the tests,
it operates properly. Check the remainder of the ASD
and fuel pump relay circuits. Refer to group 8W, Wir-
ing Diagrams.
CAMSHAFT AND CRANKSHAFT POSITION SENSOR
Refer to Group 8D, Ignition for Diagnosis and Test-
ing of Camshaft and Crankshaft Sensors.
FUEL SYSTEM 14 - 47