Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1142
3.
(K20) GEN FIELD CIRCUIT SHORTED BATTERY VOLTAGE
Turn the ignition off.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (K20) Gen Field Control circuit in the Gen-
erator Field harness connector.
Is the voltage above 1.0 volt?
Yes
>> Repair the short to battery voltage in the (K20) Gen Field
Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(K20) GEN FIELD CIRCUIT OPEN
Turn the ignition off.
CAUTION: Do not probe the PCM harness connectors. Probing the
PCM harness connectors will damage the PCM terminals resulting
in poor terminal to pin connection. Install Miller Special Tool #8815
to perform diagnosis.
Measure the resistance of the (K20) Gen Field Control circuit from the
Generator Field harness connector to appropriate terminal of the spe-
cial tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (K20) Gen Field Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
LX
5.
(K20) GEN FIELD CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K20) Gen Field Con-
trol circuit in the Generator Field harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K20) Gen Field Control
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
(Z20) GROUND CIRCUIT OPEN
Measure the resistance between the (Z20) Ground circuit in the Gen
Field harness connector and ground.
Does the test light illuminate brightly?
Yes
>> Go To 7
No
>> Repair the open in the (Z20) Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
7.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
LX
ENGINE ELECTRICAL DIAGNOSTICS
9 - 593
P0627-FUEL PUMP RELAY CIRCUIT
For a complete wiring diagram Refer to Section 8W.
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ENGINE ELECTRICAL DIAGNOSTICS
LX
•
When Monitored:
With the ignition on. Battery voltage greater than 10.4 volts.
•
Set Condition:
An open or shorted condition is detected in the fuel pump relay control circuit. One Trip Fault. Three good trips
to turn off the MIL.
Possible Causes
(F20) FUSED IGNITION SWITCH OUTPUT CIRCUIT
(A109) FUSED B+ CIRCUIT
(K31) FUEL PUMP RELAY CONTROL CIRCUIT
(K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO GROUND
FUEL PUMP RELAY
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
FUEL PUMP RELAY OPERATION
Ignition on, engine not running.
With a scan tool, actuate the Fuel Pump Relay.
Is the Fuel Pump Relay operating?
Yes
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
2.
FUEL PUMP RELAY
Turn the ignition off.
Remove the Fuel Pump Relay from the IPM.
Measure the resistance of the Fuel Pump Relay Coil.
Is the resistance between 70 to 90 ohms?
Yes
>> Go To 3
No
>> Replace the Fuel Pump Relay.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
LX
ENGINE ELECTRICAL DIAGNOSTICS
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