Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1225
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 4.
Possible Causes
(K452) MDS SOLENOID NO.4 CONTROL SHORT TO GROUND
(K452) MDS SOLENOID NO.4 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)
9 - 924
ENGINE ELECTRICAL DIAGNOSTICS
LX
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
(K452) MDS Solenoid No.4 Control Circuit in the C100 harness connec-
tor (PCM side).
Turn the ignition on.
With the scan tool, actuate the MDS Solenoid No.4.
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
(K452) MDS Solenoid No.4 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
LX
ENGINE ELECTRICAL DIAGNOSTICS
9 - 925
Is the resistance within an acceptable range?
Yes
>> Go To 9
No
>> Go To 2
4.
CHECKING PCM CONTROL SIDE FOR THE MDS SOLENOID BETWEEN C100 and C101
Turn the ignition off.
Reconnect the C100 harness connector.
Disconnect the C101 harness connector.
Using a 12-volt test light, jumper from the (Z904) Ground Circuit and the
(K452) MDS Solenoid No.4 Control Circuit in the C101 harness connec-
tor (PCM side).
Turn the ignition on.
With the scan tool, actuate the MDS Solenoid No.4.
Does the 12-volt test light flash on and off?
Yes
>> Visually and Physically inspect the wiring harness between
the C101 connector and the MDS Solenoid connector.
Repair as necessary. If OK, replace the MDS Solenoid in
accordance with the Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
(Z904) GROUND CIRCUIT OPEN BETWEEN C100 and C101
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
>> Repair the (K452) MDS Solenoid No.4 Control circuit
between C100 and C101 connectors.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Repair the (Z904) Ground circuit between C100 and C101
connectors.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
9 - 926
ENGINE ELECTRICAL DIAGNOSTICS
LX
6.
(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 C100 harness connector (PCM side).
Does the test light illuminate brightly?
Yes
>> Go To 7
No
>> Repair the open in the (Z904) Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
7.
(K452) MDS SOLENOID NO.4 CONTROL CIRCUIT SHORTED TO GROUND (PCM SIDE)
Turn the ignition off.
Measure the resistance between ground and the (K452) MDS Solenoid
No.4 Control circuit in the C100 harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K452) MDS Solenoid
No.4 Control circuit between the PCM harness connector
and the C100 harness connector.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
LX
ENGINE ELECTRICAL DIAGNOSTICS
9 - 927
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст