P3442
P3442-CYLINDER 6 DEACTIVATION CONTROL PERFORMANCEP3442-Cylinder 6 Deactivation Control Performance:
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.
WHEN MONITORED
Transition from 8 to 4 cylinder mode.
SET CONDITION
The MDS fails to disengage for cylinder 6.
POSSIBLE CAUSES
- (K453) MDS solenoid no.6 control short to voltage
- Oil passages restricted
- Lifter
- MDS solenoid no.6
- PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1. ACTIVE DTC
Ignition on, engine not running.
With a scan tool, read DTCs.
Q: Is the DTC active at this time?
YES: Go To 2
NO: Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
2. (K453) MDS SOLENOID NO.6 CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the PCM harness connector.
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.
Turn the ignition on.
Measure the voltage on (K453) MDS Solenoid No.6 Control circuit in the appropriate terminal of special tool #8815.
Q: Is voltage present?
YES: Repair the short to voltage in the (K453) MDS Solenoid No.6 Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Go To 3
3. MDS SOLENOID RESISTANCE
Turn the ignition off.
Measure the resistance between the (Z904) Ground Circuit and the (K453) MDS Solenoid Control No.6 Circuit in the appropriate terminals of special tool #8815.
NOTE: It is important to follow the below TEMP/resistance values to ensure an accurate reading.
MDS SOLENOID RESISTANCE
TEMPERATURE VALUE ± 20° F RESISTANCE (OHMS) ± 0.025 ohms
0° F 8.8 ohms
32° F 9.5 ohms
68° F 10.3 ohms
100° F 11 ohms
150° F 12.2 ohms
200° F 13.4 ohms
250° F 14.4 ohms
300° F 15.6 ohms
Q: Is the resistance within an acceptable range?
YES: Go To 4
NO: Inspect the wiring and the C100/C101 harness connectors between the solenoid and the PCM harness connector, look for signs of damage and/or corrosion. If OK, replace the MDS Solenoid.
4. PCM CONTROL
Turn the ignition off.
Disconnect the C101 harness connector
Ignition on, engine not running.
Using a 12-volt test light connected to the (Z904) Ground circuit, probe the (K453) MDS Solenoid No.6 Control circuit in the C101 harness connector.
With a scan tool, actuate the MDS Solenoid.
Q: Does the 12-volt test light flash on and off?
YES: Go To 5
NO: Replace and program the Powertrain Control Module. Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
5. MDS SOLENOID 6
Turn the ignition off.
Remove the Intake Manifold.
Turn the ignition on.
With the scan tool actuate the MDS Solenoid 6.
Q: 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 6. If the passages are not clogged with debris, replace the MDS Solenoid 6. Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
6. OIL PASSAGES RESTRICTED
Turn the ignition off.
Remove both Solenoids on Bank 2 of the engine block.
Remove the Bank 2 Cylinder Head.
Remove the Lifters from the left engine bank.
Inspect the oil passages to the Solenoids and from the Solenoids to the lifters.
Q: 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. Powertrain Verification Test
NO: Replace both sets of lifters if no other possible causes remain. Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test