Chrysler Crossfire. Manual — part 634
*CHECKING FUEL DELIVERY (CONTINUED)
4.
FUEL PUMP RELAY OUTPUT CIRCUIT OPEN
Turn the ignition off.
Disconnect the Fuel Pump harness connector.
Note: Check connectors — Clean/repair as necessary.
Turn the ignition on.
With the DRB III
T
, actuate the Fuel Pump.
Using a 12-volt test light connected to ground, probe the Fuel Pump
Relay Output circuit at the Fuel Pump harness connector.
Does the test light illuminate brightly?
Yes
>> Go To 8
No
>> Go To 5
5.
CHECK FOR AN OPEN FUEL PUMP FUSE 5
Turn the ignition off.
Remove and inspect the Fuel Pump Fuse 5 from the Relay Control Module.
Is the Fuel Pump Fuse 5 good?
Yes
>> Go To 6
No
>> Go To 7
6.
FUEL PUMP RELAY OUTPUT CIRCUIT OPEN
With the ignition off.
Disconnect the Relay Control Module B harness connector.
Note: Check connectors — Clean/repair as necessary.
Measure the resistance of the Fuel Pump Relay Output circuit from the
Fuel Pump harness connector to the Relay Control Module B harness
connector.
Is the resistance below 5.0 ohms?
Yes
>> Check the Fuel Pump Fuse 5 input circuit for voltage.
Repair as necessary. If OK, replace the Relay Control
Module.
Perform POWERTRAIN VERIFICATION TEST - VER 3.
No
>> Repair the Fuel Pump Relay Output circuit for an open.
Perform POWERTRAIN VERIFICATION TEST - VER 3.
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ENGINE - ELECTRICAL DIAGNOSTICS
9 - 681
*CHECKING FUEL DELIVERY (CONTINUED)
7.
FUEL PUMP RELAY OUTPUT CIRCUIT SHORT TO GROUND
With the ignition off.
Disconnect the Relay Control Module B harness connector.
Note: Check connectors — Clean/repair as necessary.
Measure the resistance between ground and the Fuel Pump Relay
Output circuit.
Is the resistance above 100 kohms?
Yes
>> Replace the Fuel Pump and the Fuel Pump fuse. (Refer to
14 - FUEL SYSTEM/FUEL DELIVERY/FUEL PUMP -
REMOVAL).
Perform POWERTRAIN VERIFICATION TEST - VER 3.
No
>> Repair the Fuel Pump Relay Output circuit for a short to
ground and replace the Fuel Pump fuse.
Perform POWERTRAIN VERIFICATION TEST - VER 3.
8.
FUEL PUMP
Note: Check connectors - It is critical that the connector is free
from any signs of corrosion or deformities. Clean/repair as nec-
essary.
With the ignition on.
Using a 12-volt test light connected across the Fuel Pump harness
connector.
With the DRB III
T
, actuate the Fuel Pump.
Does the test light illuminate brightly?
Yes
>> Replace the Fuel Pump. (Refer to 14 - FUEL SYSTEM/
FUEL DELIVERY/FUEL PUMP - REMOVAL).
Perform POWERTRAIN VERIFICATION TEST - VER 3.
No
>> Repair the Fuel Pump Ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST - VER 3.
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ENGINE - ELECTRICAL DIAGNOSTICS
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*CHECKING HARD START (FUEL SYSTEM)
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ENGINE - ELECTRICAL DIAGNOSTICS
9 - 683
*CHECKING HARD START (FUEL SYSTEM) (CONTINUED)
POSSIBLE CAUSES
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP
FUEL FILTER/FUEL PRESSURE REGULATOR
FUEL INJECTOR(S)
FUEL CONTAMINATION
For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIA-
GRAMS).
Diagnostic Test
1.
CHECKING FUEL PRESSURE
WARNING: THE FUEL SYSTEM IS UNDER A CONSTANT PRES-
SURE EVEN WITH THE ENGINE OFF. BEFORE TESTING OR SER-
VICING ANY FUEL SYSTEM HOSE, FITTING OR LINE, THE FUEL
SYSTEM PRESSURE MUST BE RELEASED.
Turn the ignition off.
Install a fuel pressure gauge at the engine.
Turn the ignition on.
With the DRB III
T
, actuate the Fuel Pump and observe the fuel pres-
sure gauge.
Note: Fuel pressure specification is 3.7 to 4.2 bar (54 to 61 psi).
Choose a conclusion that best matches your fuel pressure
reading.
Below Specification
Go To 2
Within Specification
Go To 4
2.
RESTRICTED FUEL FILTER/FUEL PRESSURE REGULATOR
WARNING: THE FUEL SYSTEM IS UNDER A CONSTANT PRESSURE EVEN WITH THE ENGINE OFF. BEFORE
TESTING OR SERVICING ANY FUEL SYSTEM HOSE, FITTING OR LINE, THE FUEL SYSTEM PRESSURE
MUST BE RELEASED.
Turn the ignition off.
Remove the Fuel Filter/Fuel Pressure Regulator and inspect for a plugged filter. (Refer to 14 - FUEL SYSTEM/FUEL
DELIVERY/FUEL FILTER - REMOVAL).
Is the Fuel Filter/Fuel Pressure Regulator plugged?
Yes
>> Replace the Fuel Filter/Fuel Pressure Regulator. (Refer to 14 - FUEL SYSTEM/FUEL DELIVERY/FUEL
FILTER - REMOVAL).
Perform POWERTRAIN VERIFICATION TEST - VER 1.
No
>> Go To 3
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ENGINE - ELECTRICAL DIAGNOSTICS
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