Chrysler 300M 2002 Service Manual page 2614

P0452-NVLD PRESSURE SWITCH SENSE CIRCUIT LOW —
TEST
3 NOTE: After disconnecting the Evap Purge Solenoid vacuum connections,
inspect the lines and solenoid for any signs of contamination from the EVAP
Canister. This may indicate a faulty rollover valve. Replace/repair as
necessary.
Turn the ignition off.
Disconnect the vacuum hoses at the Evap Purge Solenoid.
Using a hand vacuum pump, apply 10 in Hg to the CAN of the EVAP Purge
Solenoid.
NOTE: Monitor the vacuum gauge for at least 15 seconds.
Does the EVAP Purge Solenoid hold vacuum?
Yes → Go To 4
→ Replace the Evap Purge Solenoid.
No
4 Ignition on, engine not running.
Using the DRBIII , monitor the NVLD Switch State.
Does the DRBIII display the NVLD state OPEN?
Yes → Go To 8
→ Go To 5
No
5 Turn the ignition off.
Using the DRBIII , monitor the NVLD Switch State.
Disconnect the NVLD electrical connector.
Does the Switch change from CLOSED to OPEN?
Yes → Replace the NVLD Assembly.
→ Go To 6
No
6 Turn the ignition off.
Disconnect the NVLD electrical harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the NVLD Switch Sense circuit in the
NVLD Assembly harness connector.
Is the resistance below 5.0 ohms?
Yes → Repair the short to ground in the NVLD Switch Sense circuit.
→ NOTE: Before continuing, check the PCM harness connector
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
terminals for corrosion, damage or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - NGC
185
Continued
APPLICABILITY
All
All
All
All