Diagnostic Test

WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

1) VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
Ignition on, engine not running.

With a scan tool, read DTCs and record the related Freeze Frame data if any DTC(s) are present.

Whether or not any DTC(s) are present you will want to check the following items which may assist in repairing the customer's complaint successfully.

Check the vehicles repair history.

If the vehicle has a repair history that pertains to the customer's current complaint, review the repair.

Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly.

Check for any service bulletin(s) related to the customer's complaint or DTC(s).

If a service bulletin applies, follow the instructions per the service bulletin.

Choose the following scenario that best applies.

The service bulletin repaired the customer's complaint.
1. Testing complete.
A DTC is present, no service bulletins apply or the service bulletin didn't repair the customer's complaint.
1. Go to 2).
2) ACTIVE DTC
NOTE: If any of the following DTCs are set (P0440, P0443, P0452, P0453, P0498 or P0499) diagnose them first before continuing with P0441.

Ignition on, engine not running.

With a scan tool, read DTCs.

Is the DTC active at this time?

Yes
1. Go to 3).
No
1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
3) CHECKING EVAP PURGE SOLENOID FUNCTIONALITY
NOTE: The DTC must not be active for the actuator test to operate properly, clear all DTC before continuing.

NOTE: After disconnecting the EVAP Purge vacuum connections, inspect the lines and solenoid for any signs of contamination or foreign materials.

Using a hand vacuum pump, apply 10 in Hg to "CAN" side of the EVAP Purge Solenoid.

Ignition on, engine not running.

Observe the vacuum gauge.

With the scan tool, actuate the EVAP Purge Solenoid.

Does the vacuum drop when the solenoid is actuated?

Yes
1. Go to 4).
No
1. Replace the EVAP Purge Solenoid.
2. Perform POWERTRAIN VERIFICATION TEST .
  NOTE: Remove the vacuum pump before continuing.
4) EVAP VACUUM SUPPLY HOSE INSPECTION
Turn the ignition off.

Carefully inspect the EVAP Purge Solenoid vacuum supply hose for proper routing.

Check for a pinched or plugged hose from the throttle body or intake manifold to the Purge Solenoid.

Inspect the vacuum port at the throttle body or intake manifold for any damage or plugging.

Were any problems found?

Yes
1. Repair the vacuum supply hose/tube as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 5).
2. Perform POWERTRAIN VERIFICATION TEST .
5) NVLD SWITCH OPERATION
CAUTION: Do not attempt to probe the NVLD Terminals to diagnose the switch function. This may damage the switch and disable the NVLD component. Follow procedures outlined in the service information for NVLD switch testing using a scan tool.

Connect the previously disconnected vacuum hose.

Start the engine.

Allow the engine to idle.

Using the scan tool, perform the NVLD FORCED MONITOR TEST.

Monitor the NVLD Switch state.

NOTE: As the test runs, the NVLD Switch should go from an OPEN state to a CLOSED state and then return to OPEN when the test is complete This may take up to 10 minutes.

Did the NVLD Switch operate as described above?

Yes
1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 6).
6) NVLD ASSEMBLY

Fig 1: Checking NVLD Switch Operation
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the NVLD electrical harness connector.

Check connectors - Clean/repair as necessary.

Ignition on, engine not running.

Connect a jumper wire between the (K107) NVLD Switch Signal circuit and the (Z904) Ground circuit in the NVLD electrical harness connector.

Monitor the NVLD Switch state on the scan tool.

Does the Switch change from OPEN to CLOSED when the jumper wire is installed?

Yes
1. Replace the NVLD Assembly.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 7).
  NOTE: Remove the jumper wire before continuing.
7) (Z904) GROUND CIRCUIT OPEN

Fig 2: Measuring Resistance Between The Ground Circuit & Ground
Courtesy of CHRYSLER LLC

Turn the ignition off.

Measure the resistance between the (Z904) Ground circuit and ground.

Is the resistance below 5.0 ohms?

Yes
1. Go to 8).
No
1. Repair the open in the (Z904) Ground circuit.
2. Perform POWERTRAIN VERIFICATION TEST . .
8) (K107) NVLD SWITCH SIGNAL CIRCUIT OPEN

Fig 3: Measuring Resistance Of The Nvld Switch Signal Circuit
Courtesy of CHRYSLER LLC

Disconnect the PCM harness connectors.

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 (K107) NVLD Switch Signal circuit from the NVLD electrical harness connector to the appropriate terminal of the special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go to 9).
No
1. Repair the open in the (K107) Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
9) 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 .