Table of Contents
Advertisement
REAR SEAT BACK
FUEL PUMP MODULE CON-
TRUNK FLOOR
NUMBER
JX
DIAGNOSIS AND TESTING (Continued)
Fig. 57 Fuel Pump Module Electrical Connector
Fig. 58 ASD and Fuel Pump Relay Terminals
OPERATION
• Terminal number 30 is connected to battery volt-
age. For both the ASD and fuel pump relays, termi-
nal 30 is connected to battery voltage at all times.
• The 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 the PCM de-energizes the ASD and fuel
pump relays, terminal number 87A connects to termi-
nal 30. This is the Off position. In the off position,
voltage is not supplied to the rest of the circuit. Ter-
minal 87A is the center terminal on the relay.
• When the PCM energizes the ASD and fuel
pump relays, 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.
TERMINAL LEGEND
NECTOR
COMMON FEED
IDENTIFICATION
COIL GROUND
COIL BATTERY
NORMALLY OPEN
NORMALLY CLOSED
(2) With the relay removed from the vehicle, use an
ohmmeter to check the resistance between terminals 85
and 86. The resistance should be between 75
(3) Connect the ohmmeter between terminals 30
and 87A. The ohmmeter should show continuity
between terminals 30 and 87A.
(4) Connect the ohmmeter between terminals 87
and 30. The ohmmeter should not show continuity at
this time.
(5) Connect one end of a jumper wire (16 gauge or
smaller) 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 smaller) 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.
ENGINE COOLANT TEMPERATURE SENSOR
To perform a complete test of this sensor and its
circuitry, refer to DRB scan tool and appropriate
Powertrain Diagnostics Procedures manual. To test
the sensor only, refer to the following:
(1) With the key off, disconnect wire harness con-
nector from coolant temperature sensor.
(2) Connect one lead of a high input impedance
(digital) volt- ohmmeter to one terminal of sensor.
(3) Connect the other ohmmeter lead to remaining
terminal of sensor. The ohmmeter should read as fol-
lows:
• Engine/Sensor at normal operating temperature
around 200°F should read approximately 700 to
1,000 ohms.
• Engine/Sensor at room temperature around 70°F
ohmmeter should read approximately 7,000 to 13,000
ohms.
(4) Test the resistance of the wire harness between
the PCM connector terminal 26 and the sensor har-
ness connector. Also check for continuity between
FUEL SYSTEM
14 - 45
5 ohms.
Advertisement
Chapters
Table of Contents
