Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1149
4.
(K51) ASD RELAY CONTROL CIRCUIT OPEN
Disconnect the PCM harness connectors.
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 (K51) ASD Relay Control circuit from the
IPM to the appropriate terminals of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (K51) ASD Relay Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
5.
(K51) ASD RELAY CONTROL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K51) ASD Relay Con-
trol circuit in the IPM.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K51) ASD Relay Control
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
9 - 620
ENGINE ELECTRICAL DIAGNOSTICS
LX
6.
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 - 621
P0688-AUTO SHUTDOWN RELAY SENSE CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
9 - 622
ENGINE ELECTRICAL DIAGNOSTICS
LX
•
When Monitored:
With ignition key on. Battery voltage greater than 10 volts.
•
Set Condition:
No voltage sensed at the PCM when the ASD relay is energized. One Trip Fault. Three good trips to turn off
the MIL.
Possible Causes
(A922) FUSED B+ CIRCUITS
ASD RELAY OUTPUT CIRCUIT OPEN
ASD RELAY
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
VERIFY ASD DTC
NOTE: Diagnose P0685 - Auto Shutdown Relay Control Circuit first if it set along with this DTC.
With a scan tool, erase the DTC.
Attempt to start the engine. If the engine will not start, crank the engine for at least 15 seconds. It may be neces-
sary to repeat several times.
Does the DTC reset?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
ENGINE OPERATION
Attempt to start the engine.
Does the engine start?
Yes
>> Go To 3
No
>> Go To 4
LX
ENGINE ELECTRICAL DIAGNOSTICS
9 - 623
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