Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1223
3.
MDS SOLENOID 7
With the scan tool actuate the MDS Solenoid 7.
Can you feel and hear the Solenoid Actuating?
Yes
>> Go To 4
No
>> Remove the Solenoid and check for any debris that may be blocking the oil passages to the Solenoid.
If the passages are restricted, clean the passages and replace the MDS Solenoid 7. If the passages are
not clogged with debris, replace the MDS Solenoid 7.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4.
OIL PASSAGES RESTRICTED
Turn the ignition off.
Remove both Solenoids on Bank 1 of the engine block.
Remove the Bank 1 Cylinder Head per Service Information.
Remove the Lifters from the left 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.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace both sets of lifters if no other possible causes remain.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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P3402-CYLINDER 1 DEACTIVATION CONTROL PERFORMANCE
For a complete wiring diagram Refer to Section 8W.
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 917
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 1.
Possible Causes
(K451) MDS SOLENOID NO.1 CONTROL SHORT TO GROUND
(K451) MDS SOLENOID NO.1 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)
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ENGINE ELECTRICAL DIAGNOSTICS
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2.
CHECKING PCM CONTROL SIDE FOR THE MDS SOLENOID (C100)
Turn the ignition off.
Disconnect the C100 harness connector.
Using a 12-volt test light, jumper from the (Z904) Ground Circuit and the
(K451) MDS Solenoid No.1 Control Circuit in the C100 harness connec-
tor (PCM side).
Turn the ignition on.
With the scan tool, actuate the MDS Solenoid No.1.
Does the 12-volt test light flash on and off?
Yes
>> Go To 3
No
>> Go To 6
3.
MDS SOLENOID RESISTANCE
Turn the ignition off.
Measure the resistance between the (Z904) Ground Circuit and the
(K451) MDS SolenoidNo.1 Control Circuit in the C100 harness connec-
tor (MDS side).
NOTE: It is important to follow the below temp/resistance values to
ensure an accurate reading.
MDS SOLENOID RESISTANCE
TEMPERATURE VALUE ± 20° F
RESISTANCE (OHMS) ± .25 ohms
0° F
8.8 ohms
32° F
9.5 ohms
68° F
10.3 ohms
100° F
11 ohms
150° F
12.2 ohms
200° F
13.4 ohms
250° F
14.4 ohms
300° F
15.6 ohms
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ENGINE ELECTRICAL DIAGNOSTICS
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