TECHNICAL SERVICE OPERATIONS

MAS004191 BOL 24-19
Diagnostic Sheet
FROM: Maserati TSO
TO: Maserati Network

Ghibli QP Levante DTC P0090

DATE: May10, 2024

This Diagnostic Sheet serves as a guide and provides additional diagnostic info for possible
DTC"P0090 - Fuel Pressure Regulator Control Circuit 1 Open" stored in the engine control unit (ECM).
MODELS: M157 Ghibli V6, M156 Quattroporte V6 and M161 Levante V6(MY 22-23).
SUBJECT: DTC in ECM “P0090 - Fuel Pressure Regulator Control Circuit 1 Open” accompanied by engine
warning light and reduced performance. This DTC is stored if the engine control unit detects a control current
value of the MSV valve of the GDI pump lower than 0.7 [A] for a time exceeding 500 ms.
ACTION:
1. Save a complete scan report. Check whether the vehicle has already been subjected to Rapid Update
648. If so, open a BOL as a "Support Request", reporting the outcome of the checks already carried out. If not,
proceed with the next steps.
2. Disconnect the 12V battery by following the procedure in the workshop manual:
▪ 08.20.001 - BATTERY - Connection-disconnection of power supply.
3. the procedure indicated in the workshop manual up to step 22 (where you release the clips shown in the
photo):
▪ 01.90.013 - CPL. ENGINE INJECTION CABLES - Removal-Refitting or Replacement.

4. Identify the connector to allow correct procedure.
© 2024 Maserati North
America. Aftersales
www.maseratiusa.com

MAS004191

All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA

Page 1 of 2

TECHNICAL SERVICE OPERATIONS

5. Insert the feeler (p/n 900100002) in one of the two seats of the connector. The feeler is designed to have the
same dimensional characteristics as the pins on the pump, to test and simulate the coupling.

6. Wiggle test the connector manually, with the sensor inserted, to check that there is no looseness of the seat
such as to allow the sensor itself to come out, partial or total (this is to simulate the vibrations of the vehicle
during operating conditions).
7. Carry out the same procedure for the other connector seat, using the same feeler.
8. If the test is positive, i.e. the probe remains well anchored to the connector seat, the component is OK.
No further steps are required at this point.
9. Reassemble all the removed parts following the procedure in reverse order and you can release the vehicle.
10. If, on the other hand, the test is negative, i.e. the probe does not remain well connected even to only one of
the two seats, the component is NOT OK. At this point the connector (p/n 673015820) needs to be replaced.
11. Replace the connector following the procedure indicated in the bulletin MAS000766.
(For details, please refer to TechDOC procedure 0.30.005 - CONNECTORS REPAIR - REPLACEMENT – Warnings).

Note: while soldering the wire, it is necessary to protect all the areas involved from heat with adequate
protections
12. Perform a functional check to verify that the system is functioning correctly.
13. Open a BOL as "factory information", attaching the scan report requested in step 1 and the results of the
checks listed above.
TECHNICAL SERVICE OPERATIONS

© 2024 Maserati North
America. Aftersales
www.maseratiusa.com

MAS004191

All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA

Page 2 of 2