Chrysler 300M 2002 Service Manual page 2679

DRIVEABILITY - NGC
P0627-FUEL PUMP RELAY CIRCUIT —
TEST
2 NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
With the engine running at normal operating temperature, monitor the DRBIII
parameters related to the DTC while wiggling the wire harness. Look for parameter
values to change and/or a DTC to set.
Review the DRBIII Freeze Frame information. If possible, try to duplicate the
conditions under which the DTC was set.
With the DRBIII , actuate the Fuel Pump Relay.
Wiggle the wire harness from the Fuel Pump Relay to the PCM while the relay is
actuating.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
Yes → Repair as necessary
→ Test Complete.
No
3 Turn the ignition off.
Remove the Fuel Pump Relay from the PDC.
Ignition on, engine not running.
Measure the voltage of the Fused Ignition Switch Output circuit in the PDC.
Is the voltage above 11.0 volts?
Yes → Go To 4
→ Repair the Fused Ignition Switch Output circuit. Check and
No
4 Turn the ignition off.
Remove the Fuel Pump Relay from the PDC.
Measure the resistance of the Fuel Pump Relay between the Fused Ignition Switch
Output terminal and the Fuel Pump Relay Control terminal.
Is the resistance between 70 to 90 ohms?
Yes → Go To 5
→ Replace the Fuel Pump Relay.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
replace any open fuses.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
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APPLICABILITY
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