p3449.pdf

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2007 - WK - JEEP GRAND CHEROKEE - 5.7L HEMI V8 - MDS

P3449-MDS SOLENOID 7 CIRCUIT

1

2

38

10

29

1

38

10

29

1

38

10

29

1

C2C1 C3C3

819603f5

1628 56

142 3

111 1

22 22

6

41

20

BR/WT

20

BR/OR

20

BR/DG

20

BR/LB

20

BR/LB

20

BR/DG

20

BR/OR

20

BR/WT

20

BK/LG

20

BK/LG

20

BK/LG

20

BK/LG

20

BK/LG

20

BK/LG

16

BK/LG

16

BK/LG

K451 K454K453K452

K452 K453 K454K451

Z42Z42 Z42Z42

Z42

Z42

Z42

Z42

C104

C112

C112

S154

S14

G101

SOLENOID-

MULTI

DISPLACEMENT

SYSTEM

MODULE-

POWERTRAIN

CONTROL C3

MODULE-

POWERTRAIN

CONTROL C2

MODULE-

POWERTRAIN

CONTROL C1

MODULE-

POWERTRAIN

CONTROL

SOLENOID-

MULTI

DISPLACEMENT

SYSTEM CYL 1

SOLENOID-

MULTI

DISPLACEMENT

SYSTEM CYL 4

SOLENOID-

MULTI

DISPLACEMENT

SYSTEM CYL 7

SOLENOID-

MULTI

DISPLACEMENT

SYSTEM CYL 6

MDS

SOL

CONTROL NO. 4

MDS

SOL

CONTROL NO. 6

MDS

SOL

CONTROL NO. 7

MDS

SOL

CONTROL NO. 1

(5.7L)

BLACK/NATURALBLACK/ORANGEBLACK/BLACK

For a complete wiring diagram Refer to the Wiring Information.

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.

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When Monitored:

Transition from 8 to 4 cylinder mode.

Set Condition:

When the PCM recognizes a problem with the Solenoid Control circuit. One trip fault.

Possible Causes

(K454) MDS SOLENOID NO.7 CONTROL SHORTED TO VOLTAGE

(K454) MDS SOLENOID NO.7 CONTROL SHORT TO GROUND

(K454) MDS SOLENOID NO.7 CONTROL OPEN

(Z42) GROUND CIRCUIT OPEN

MDS SOLENOID NO.7

POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based

Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

1. ACTIVE DTC

NOTE: Diagnose any Misfire DTCs before continuing.

1. Start the engine and allow it to reach normal operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the

pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in

possible serious or fatal injury.

NOTE: It may be necessary to test drive the vehicle in order for this DTC to set.

2. With a scan tool, select View DTCs.

NOTE: Diagnose any Deactivation or Oil Pressure DTCs before continuing with this test.

Is the DTC Active at this time?

Yes Go To 2

No Refer to the INTERMITTENT CONDITION Diagnostic Procedure. (Refer to 28 - DTC-Based Diagnostics/

MODULE, Powertrain Control (PCM) - Standard Procedure).

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2. MDS SOLENOID NO.7

1. Turn the ignition off.

2. Gain access to the MDS Solenoid No.7.

3. Disconnect the MDS Solenoid No.7 harness connector.

4. Ignition on, engine not running.

5. Turn off all accessories.

6. Using a 12-volt test light connected to the (Z42) Ground

circuit, probe the (K454) MDS Solenoid No.7 Control

circuit.

7. With a scan tool, actuate the MDS Solenoid No.7.

NOTE: The DTC needs to be cleared before

actuating the Solenoid, if the DTC is not

cleared, the Solenoid may not be allowed to

actuate.

NOTE: The test light should be illuminated and

bright proportional to the maximum dutycycle allowed by the scan tool. For example,

if the scan tool allows 100% actuation, the

brightness should be as bright as a direct

connection to the battery. If the scan tool

allows a maximum 25% actuation, the

brightness should be 25% as bright as a

direct connection to the battery.

8. With a scan tool, actuate the MDS Solenoid No.7.

Does the 12-volt test light illuminate accordingly?

Yes Verify that there is good pin to terminal contact

in the Solenoid and the Powertrain Control

Module connectors. If OK, replace the MDS

Solenoid No.7.

Perform the POWERTRAIN VERIFICATION

TEST. (Refer to 28 - DTC-Based Diagnostics/

MODULE, Powertrain Control (PCM) -

Standard Procedure).

No Go To 3

2

1

2

0

1

3

125693

2

1

2BLACK

(5.7L MDS)

SOLENOID-

MULTI DISPLACEMENT

SYSTEM CYL 7

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3. (Z42) GROUND CIRCUIT OPEN


2. Using a 12-volt test light connected to the 12-volts,

probe the (Z42) Ground circuit in the MDS Solenoid

No.7 harness connector.

Does the test light illuminate brightly?

Yes Go To 4

No Repair the open in the (Z42) Ground circuit.





2

3

1

0

2

B+

125695

2

1

0BLACK

(5.7L MDS)

SOLENOID-

MULTI DISPLACEMENT

SYSTEM CYL 7

4. (K454) MDS SOLENOID NO.7 CONTROL CIRCUIT SHORTED TO VOLTAGE

1. Disconnect the C3 PCM harness connector.

2. Ignition on, engine not running.

3. Measure the voltage on the (K454) MDS Solenoid

No.7 Control circuit in the MDS Solenoid No.7 harness

connector.

Is there any voltage present?

Yes Repair the short to voltage in the (K454) MDS

Solenoid No.7 Control circuit.





No Go To 5

1

V

125697

3

0

1

2

2

1

2BLACK

(5.7L MDS)

SOLENOID-

MULTI DISPLACEMENT

SYSTEM CYL 7

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5. (K454) MDS SOLENOID NO.7 CONTROL CIRCUIT SHORTED TO GROUND


2. Measure the resistance between ground and the (K454)

MDS Solenoid No.7 Control circuit in the MDS

Solenoid No.7 harness connector.

Is the resistance below 100 ohms?

Yes Repair the short to ground in the (K454) MDS

Solenoid No.7 Control circuit.





No Go To 6

1

0

1

2

3

125699

2

1

0BLACK

(5.7L MDS)

SOLENOID-

MULTI DISPLACEMENT

SYSTEM CYL 7

6. (K454) MDS SOLENOID NO.7 CONTROL CIRCUIT OPEN

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 the

PCM Pinout Box Kit, NGC, 38 Position

8815A to perform diagnosis.

1. Measure the resistance of the (K454) MDS SolenoidNo.7 Control circuit from the MDS Solenoid No.7

harness connector to the appropriate terminal of special

tool # 8815A .

Is the resistance below 5.0 ohms?

Yes Go To 7

No Repair the open in the (K454) MDS Solenoid

No.7 Control circuit.





1

5

2

1

2

3

1

0

81

9

16

24

31

15

23

30

38

125701

0

BLACK

(5.7L MDS)

PCM

PINOUT

BOX 8815

SOLENOID-

MULTI DISPLACEMENT

SYSTEM CYL 7

7. POWERTRAIN CONTROL MODULE (PCM)

1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Solenoid and the

Powertrain Control Module (PCM).

2. Look for any chafed, pierced, pinched, or partially broken wires.
http://millerspecialtools.spx.com/Detail.aspx?id=1694http://millerspecialtools.spx.com/Detail.aspx?id=1694http://millerspecialtools.spx.com/Detail.aspx?id=1694http://millerspecialtools.spx.com/Detail.aspx?id=1694

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3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the

Solenoid and the Powertrain Control Module connectors.

4. Refer to any Technical Service Bulletins that may apply.

Were there any problems found?

Yes Repair as necessary.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE,

Powertrain Control (PCM) - Standard Procedure).

No Replace and program the Powertrain Control Module per Service Information.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE,

Powertrain Control (PCM) - Standard Procedure).

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