Jeep Grand Cherokee WK. Manual — part 1124

P3497-MDS RATIONALITY BANK 2 (CONTINUED)

3.

MDS SOLENOID 6

With the scan tool actuate the MDS Solenoid 6.

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 6. If the passages are
unable to be cleaned out, replacing the engine block may be necessary. If the passages are not clogged
with debris, replace the MDS Solenoid 6.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

4.

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 each pair of lifters for Cylinders 4 and 6.

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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U0001-CAN C BUS

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ENGINE ELECTRICAL DIAGNOSTICS

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U0001-CAN C BUS (CONTINUED)

For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Ignition run time is greater than 1 second. Battery voltage between 9 and 16 volts. Engine run time greater
than 3 seconds.

•

Set Condition:
The PCM loses communication over the CAN C Bus circuit. The circuit is continuously monitored.

Possible Causes

CAN C BUS OPEN OR SHORTED CONDITION

PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).

Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic
procedures and for further possible causes.

Diagnostic Test

1.

ACTIVE DTC

Ignition on, engine not running.

With a scan tool, read FCM DTCs.

Is the DTC active at this time?

Yes

>> Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diag-

nostic procedures and for further possible causes.

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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U0101-LOST COMMUNICATION WITH TCM

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Ignition run time is greater than 1 second. Battery voltage between 9 and 16 volts. Engine run time greater
than 3 seconds.

•

Set Condition:
The PCM doesn’t receive a Bus Message from the Transmission Control Module for 7 consecutive seconds.
The circuit is continuously monitored.

Possible Causes

CAN C BUS OPEN OR SHORTED CONDITION

PCM

Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic
procedures and for further possible causes.

Diagnostic Test

1.

ACTIVE DTC

Ignition on, engine not running.

With a scan tool, read PCM DTCs.

Is the DTC active at this time?

Yes

>> Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diag-

nostic procedures and for further possible causes.

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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