MAS003829 Service Bulletin/Repair Instructions

TECHNICAL SERVICE OPERATIONS
MAS003829 RU 23-62

RAPID UPDATE

FROM: Maserati TSO

TO: Maserati Network
Rapid Update 673

Grecale – RFHM Software Update
DATE: OCTOBER 24 2023
Certain Maserati Grecale (M182) MY23 MY24 listed in MODISCS+ are involved in a Rapid to

update the Radio Frequency HUB Module (RFHM) software.

This update is essential to prevent the occurrence of a false TPMS (Tire Pressure Monitoring

System) warning indication. In specific situations, the front tire pressures might erroneously

appear in yellow on the cluster display, even when the actual tire pressures meet or exceed the

specified values. This problem stems from an incorrect internal calculation related to the

hexadecimal conversion between psi and bar. It's crucial to note that this update does not

alter the tire pressure values as stated in the owner manuals and technical documentation.

We remind you that all the Rapid Updates must be performed within the first workshop visit,

regardless of the Mandatory setting set in Modis, as required by Maserati policies.

Also, for vehicles in Stock Dealer / PDI, it is necessary to carry out all action operations before

delivery to the end customer, as required by the White Book and explicitly reported in the Predelivery checklist.

Please read and review this bulletin first before ordering parts and/or starting the procedure.

Contact your Regional AfterSales Manager (RAM) or the Technical Support Helpdesk if you

have any questions. (Maseratitechsupport@maserati.com)

Thank You for your continued support and cooperation.

Maserati Americas

Aftersales Dept.

© 2023 Maserati Americas

Aftersales

www.maseratiusa.com
MAS003829
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 4
The latest software update addresses a bug related to the TPMS warning indicator light that

remained illuminated, even when the tire pressure was within the correct range and

matched the specifications outlined in the owner's documentation for tire sizes 19", 20", and

21".

**IMPORTANT**: The modification from 30 to 31 in the active parameter is necessary to rectify

an erroneous internal calculation in the hexadecimal conversion between psi and bar, and

this adjustment is specific to 19" tires. It's essential to emphasize that there are no alterations

to the tire pressure values as they are presented in the owner manuals and technical

documentation. The parameter change solely aims to ensure an accurate internal

calculation process.

Be aware that, in case of a further tire replacement starting from 20” or 21” to 19”, the active

diagnosis “Front Axle Nominal Tire (Placard) Pressure” must be performed to set 31 psi.
Technical Procedure

All images shown in this bulletin are for illustrative purposes only
1. Always check ModisCS+ to see if the vehicle is involved in this action and if it has not been

previously performed.

2. Use the attached VIN list to determine which actions to be performed:

•
” Software Update Only”
•
“Active Diagnosis Only”
•
“SW Update + Active Diagnosis”
Use the Attached VIN list to verify the correct actions to be performed for each VIN
Complete VIN
VIN
Status
Action
ZN6CW82D007426750

ZN6AW82F6P7433440

ZN6AW82C007433328

ZN6AW82B007433479

ZN6AW82F1P7434639
426750

433440

433328

433479

434639
95

95

94

95

95
Software Update Only

SW Update + Active Diagnosis

SW Update + Active Diagnosis

Software Update Only

Active Diagnosis Only
VIN list example
© 2023 Maserati Americas

Aftersales

www.maseratiusa.com
MAS003829
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 4
TECHNICAL SERVICE OPERATIONS
Overview
TECHNICAL SERVICE OPERATIONS
RFHM Software Update

Attention: Only perform this procedure if the VIN list calls for” Software Update Only” or “SW

Update + Active Diagnosis” for the vehicle involved

1. Before proceeding, please ensure that the engine is off.

2. Connect a battery maintainer to the 12V battery (It is recommended to always use the

E-XTEQ MAXIMUS to maintain minimum voltage and current draw requirements)

3. Connect the EVO to the vehicle, ensure that battery voltage is around 12.5V then select

RFHM ► ECU Programming and follow the prompts.

Software version to be installed (or newer):

Market
F188 Target
ROW
670305110
4. If the involved vehicle also requires the “Active Diagnosis” procedure (action labeled as "SW

Update + Active Diagnosis"), then please follow the subsequent instructions provided below.

Otherwise, the procedure is considered complete.
Active Diagnosis Procedure

Attention: Only perform this procedure if the VIN list calls for “Active Diagnosis Only” or “SW

Update + Active Diagnosis” for the vehicle involved

1. Using the EVO, from vehicle view select RFHM then select Active diagnosis, as shown in the

picture below:
© 2023 Maserati Americas

Aftersales

www.maseratiusa.com
MAS003829
All rights reserved. Reproduction or translation in

whole or in part is not permitted without

authorization from the publisher. Printed in USA
Page 3 of 4
TECHNICAL SERVICE OPERATIONS
2. Select Front Axle Nominal Tire (Placard) Pressure to update the front tires pressure:
3. Insert 31 in the text box and click on Execute to set the new value:
4. Operation complete.
Warranty Claim

Fill in the Warranty Claims as follows:
Description
Code
Rapid Update Number
673
Warranty Code
23
Fault Code
063
Component Code
8.53.088
Operation Code

Active Diagnosis
8.53.088.A (0,15 h)
RFHM Software Update
8.53.088.B (0,20 h)
RFHM SW Update + Active Diagnosis
8.53.088.C (0,30 h)
© 2023 Maserati Americas

Aftersales

www.maseratiusa.com
MAS003829
All rights reserved. Reproduction or translation in

whole or in part is not permitted without

authorization from the publisher. Printed in USA
Page 4 of 4

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