Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
NOTE:
Diagnose any Misfire DTCs before continuing.
1. Ignition on, engine not running.
2. With a scan tool, read the DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
(K451) MDS SOLENOID NO. 1 CONTROL CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Disconnect the C140 harness connector. The connector is located behind the left side cylinder head.
4. Turn the ignition on.
5. Measure the voltage on (K451) MDS Solenoid No. 1 Control circuit in the C140 inline harness connector.
  Is voltage present?
  
  Yes
  - Repair the short to voltage in the (K451) MDS Solenoid No. 1 Control circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3

MDS SOLENOID RESISTANCE

Turn the ignition off.

Measure the resistance between the Ground circuit and the (K451) MDS Solenoid No. 1 Control circuit in the C140 harness connector (MDS Side).

NOTE:

It is important to follow the below temp/resistance values to ensure an accurate reading.

MDS SOLENOID RESISTANCE
TEMPERATURE VALUE	RESISTANCE - MINIMUM	RESISTANCE - MAXIMUM
-18° C (0° F)	7.22 ohms	8.12 ohms
0° C (32° F)	7.92 ohms	8.82 ohms
20° C (68° F)	8.72 ohms	9.62 ohms
38° C (100° F)	9.42 ohms	10.32 ohms
66° C (150° F)	10.62 ohms	11.52 ohms
93° C (200° F)	11.82 ohms	12.72 ohms
121° C (250° F)	12.82 ohms	13.72 ohms
149° C (300° F)	14.02 ohms	14.92 ohms

Is the resistance within an acceptable range?

Yes

Go To 4

Visually and Physically inspect the wiring harness between the C140 connector and the MDS Solenoid connector. Repair as necessary. If OK, replace the MDS Solenoid in accordance with the Service Information. Refer to SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L .
Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

POWERTRAIN CONTROL MODULE (PCM) CONTROL
1. Turn the ignition off.
2. Reconnect the PCM C2 harness connector.
3. Disconnect the C140 harness connector.
4. Ignition on, engine not running.
5. Using a 12-volt test light connected to the Ground circuit, probe the (K451) MDS Solenoid No. 1 Control circuit in the C140 harness connector.
6. With a scan tool, actuate the MDS Solenoid.
  Does the 12-volt test light flash on and off?
  
  Yes
  - Go To 5
  No
  - Replace and program the Powertrain Control Module in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL . Refer to PCM/ECM REPROGRAMMING - GAS .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
MDS SOLENOID 1

Fig 1: View Of MDS Solenoids
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Remove the Intake Manifold in accordance with the service information. Refer to MANIFOLD, INTAKE, REMOVAL, 5.7L .
3. Turn the ignition on.
4. With the scan tool actuate the MDS Solenoid 1.
  Can you feel and hear the Solenoid Actuating?
  
  Yes
  - Go To 6
  No
  - Remove the Solenoid (1) and check for any debris that may be blocking the oil passages (3) to the Solenoid. If the passages are clogged, clean the passages and replace the MDS Solenoid 1. If the passages are not clogged with debris, replace the MDS Solenoid 1.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
OIL PASSAGES RESTRICTED
1. Turn the ignition off.
2. Remove both Solenoids on Bank 1 of the engine block.
3. Remove the Bank 1 Cylinder Head in accordance with the service information. Refer to CYLINDER HEAD, REMOVAL, 5.7L .
4. Remove the Lifters from the left engine bank.
5. 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 POWERTRAIN VERIFICATION TEST .
  No
  - Replace both sets of lifters if no other possible causes remain. Refer to LIFTER(S), HYDRAULIC, ROLLER, REMOVAL, 5.7L .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .