Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1227
4.
(Z904) GROUND CIRCUIT OPEN (PCM SIDE)
Turn the ignition off.
Using a 12-volt test light connected to the 12-volts, probe the (Z904)
Ground circuit in the C101 harness connector (PCM side).
Does the test light illuminate brightly?
Yes
>> Go To 5
No
>> Repair the open in the (Z904) Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
5.
(K453) MDS SOLENOID NO.6 CONTROL CIRCUIT SHORTED TO GROUND (PCM SIDE)
Turn the ignition off.
Measure the resistance between ground and the (K453) MDS Solenoid
No.6 Control circuit in the C101 harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K453) MDS Solenoid
No.6 Control circuit between the PCM harness connector
and the C101 harness connector.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
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ENGINE ELECTRICAL DIAGNOSTICS
LX
6.
(K453) MDS SOLENOID NO.6 CONTROL CIRCUIT OPEN (PCM SIDE)
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 (K453) MDS Solenoid No.6 Control circuit
from the C101 harness connector to the appropriate terminal of special
tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Replace and program the Powertrain Control Module in
accordance with the service information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Repair the open in the (K453) MDS Solenoid No.6 Control
circuit between the C101 harness connector and the PCM
harness connector.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
7.
MDS SOLENOID 6
Turn the ignition off.
Remove the Intake Manifold per Service Information.
Reconnect the PCM harness connector.
Turn the ignition on.
With the scan tool actuate the MDS Solenoid 6.
Can you feel and hear the Solenoid Actuating?
Yes
>> Go To 8
No
>> Remove the Solenoid (1) and check for any debris that may
be blocking the oil passages (3) to the Solenoid. If the pas-
sages are clogged, clean the passages and replace the
MDS Solenoid 6. If the passages are not clogged with
debris, replace the MDS Solenoid 6.
8.
OIL PASSAGES RESTRICTED
Turn the ignition off.
Remove both Solenoids on Bank 2 of the engine block.
Remove the Bank 2 Cylinder Head per Service Information.
Remove the Lifters from the right engine bank.
Inspect the oil passages to the Solenoids and from the Solenoids to the lifters.
Are the passages blocked?
Yes
>> Clean the oil passages as necessary. If the entire engine is restricted disassembly of the entire engine
block may be necessary.
No
>> Replace both sets of lifters if no other possible causes remain.
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 933
P3450-CYLINDER 7 DEACTIVATION CONTROL PERFORMANCE
For a complete wiring diagram Refer to Section 8W.
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ENGINE ELECTRICAL DIAGNOSTICS
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Theory of Operation
When all criteria has been met, power is supplied to each MDS Solenoid when the engine is making a transition
from 8 cylinder mode to 4 cylinder mode. By actuating the solenoid, oil pressure is raised to the pair of lifters that
coincide with each particular solenoid. The oil pressure pushes in the locking pins that allows the lifter to collapse,
decoupling the valves and camshaft.
•
When Monitored:
Transition from 8 to 4 cylinder mode.
•
Set Condition:
The MDS fails to engage for cylinder 7.
Possible Causes
(K454) MDS SOLENOID NO.7 CONTROL SHORT TO GROUND
(K454) MDS SOLENOID NO.7 CONTROL OPEN
(Z904) GROUND CIRCUIT OPEN
INSUFFICIENT OIL PRESSURE ACTING ON THE LIFTER LOCKING PINS
OIL PASSAGES RESTRICTED
LIFTER
MDS SOLENOID
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With a scan tool, read DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
LX
ENGINE ELECTRICAL DIAGNOSTICS
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