Jeep Grand Cherokee WK. Manual — part 1047
P1417–CYLINDER 7 REACTIVATION CONTROL PERFORMANCE (CONTINUED)
2.
MDS SOLENOID NO.7
Turn the ignition off.
Gain access to the MDS Solenoid No.7.
Disconnect the MDS Solenoid No.7 harness connector.
Ignition on, engine not running.
Turn off all accessories.
Using a 12-volt test light connected to the (Z904) Ground circuit, probe
the (K454) MDS Solenoid No.7 Control circuit.
With a scan tool, actuate the MDS Solenoid 7.
Does the 12-volt test light flash on and off?
Yes
>> Go To 7
No
>> Go To 3
3.
(Z42) GROUND CIRCUIT OPEN
Turn the ignition off.
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.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P1417–CYLINDER 7 REACTIVATION CONTROL PERFORMANCE (CONTINUED)
4.
(K454) MDS SOLENOID NO.7 CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C3 PCM harness connector.
Measure the resistance between ground and the (K454) MDS Sole-
noid 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.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
(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 Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (K454) MDS Solenoid No.7 Control cir-
cuit from the MDS Solenoid No.7 harness connector to the appropriate
terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the open in the (K454) MDS Solenoid No.7 Control
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
WK
ENGINE ELECTRICAL DIAGNOSTICS
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P1417–CYLINDER 7 REACTIVATION CONTROL PERFORMANCE (CONTINUED)
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)
7.
MDS SOLENOID 7
Turn the ignition off.
Remove the Intake Manifold per Service
Information.
Reconnect the Solenoid harness connector.
Turn the ignition on.
With the scan tool actuate the MDS Sole-
noid 7.
Can you feel and hear the Solenoid
Actuating?
Yes
>> Go To 8
No
>> Remove
the
Solenoid
and
check for any debris that may
be blocking the oil passages to
the Solenoid. If the passages
are clogged, clean the pas-
sages 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)
8.
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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P1501-VEHICLE SPEED SENSOR 1/2 CORRELATION - DRIVE WHEELS
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 787
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