Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) ACTIVE DTC
Ignition on, engine not running.

With a scan tool, read DTCs.

Is the DTC active at this time?

Yes
1. Go To step 2).
No
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
2) MDS SOLENOID NO.6

Fig 1: Checking Multi Displacement System Cylinder 6 Solenoid Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Gain access to the MDS Solenoid No.6.

Disconnect the MDS Solenoid No.6 harness connector.

Ignition on, engine not running.

Turn off all accessories.

Using a 12-volt test light connected to the (Z42) Ground circuit, probe the (K453) MDS Solenoid No.6 Control circuit.

With a scan tool, actuate the MDS Solenoid 6.

Does the 12-volt test light flash on and off?

Yes
1. Go To step 7).
No
1. Go To step 3).
3) (Z42) GROUND CIRCUIT OPEN

Fig 2: Checking Multi Displacement System Cylinder 6 Solenoid Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

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.6 harness connector.

Does the test light illuminate brightly?

Yes
1. Go To step 4).
No
1. Repair the open in the (Z42) Ground circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
4) (K453) MDS SOLENOID NO.6 CONTROL CIRCUIT SHORTED TO GROUND

Fig 3: Checking Multi Displacement System Cylinder 6 Solenoid Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the C2 PCM harness connector.

Turn the ignition off.

Measure the resistance between ground and the (K453) MDS Solenoid No.6 Control circuit in the MDS Solenoid No.6 harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (K453) MDS Solenoid No.6 Control circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 5).
5) (K453) MDS SOLENOID NO.6 CONTROL CIRCUIT OPEN

Fig 4: Checking Multi Displacement System Cylinder 6 Solenoid Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

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 (K453) MDS Solenoid No.6 Control circuit from the MDS Solenoid No.6 harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go To step 6).
No
1. Repair the open in the (K453) MDS Solenoid No.6 Control circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
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
1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Replace and program the Powertrain Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .
7) MDS SOLENOID 6

Fig 5: Checking Multi Displacement System Cylinder Solenoids
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Remove the Intake Manifold per Service Information.

Reconnect the Solenoid connector.

Turn the ignition on.

With the scan tool actuate the MDS Solenoid 6.

Can you feel and hear the Solenoid Actuating?

Yes
1. Go To step 8).
No
1. 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 passages and replace the MDS Solenoid 6. If the passages are not clogged with debris, replace the MDS Solenoid 6.
2. Perform POWERTRAIN VERIFICATION TEST .
8) 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 Lifters from the right engine bank.

Inspect the oil passages to the Solenoids and from the Solenoids to the lifters.

Are the passages blocked?

Yes
1. Clean the oil passages as necessary. If the entire engine is restricted disassembly of the entire engine block may be necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Replace both sets of lifters if no other possible causes remain.
2. Perform POWERTRAIN VERIFICATION TEST .