TECHNICAL SERVICE OPERATIONS

MAS004274 BOL 24-26
Diagnostic Sheet
FROM: Maserati TSO
TO: Maserati Network

Air Suspension System - Fuse F41 blown

ATTENTION! This bulletin supersedes MAS002814 released on May 26, 2023. Please discard/remove all
copies of the previous bulletin.
DATE: September 6, 2024
This Diagnostic Sheet serves as a guide and provides additional diagnostic info for Air Suspension
system anomalies on Maserati Levante vehicles

MODELS: M161 Levante (All MY).
Issue: Difficulty changing the ride height of the vehicle with warning on the Instrument Panel:
“SERVICE AIR SUSPENSION or CHECK AIR SUSPENSION SYSTEM”. The vehicle may have a misalignment
(front suspension lower than the rear suspension) and/or the compressor fuse (F41 in RDU, Rear
Distribution Unit, rear fuse box) is blown.
Faults: possible DTCs stored in ASCM:
C15A1-00 (55A100) - Unable to Obtain Desired Ride Height
C15D9-00 (55D900) - Low Air Mass
C1562-98 - Ride Height Air Pump Control-Component or System Over Temperature
C2212-00 (621200) ECU - in plant mode
CHECKS: If the customer’s concern matches this type of anomaly, open a BOL and attach all the
requested information.
It’s necessary to fill in the attachments: Attachment A: checklist and Attachment C: summary table
of vehicle height and angle measurements printed and scanned or in electronic format, as a PDF
when attaching to the BOL.

Depending on the information in the Notes section, the checklist may need to be partially
or completely filled out.
NOTE: Maserati has already introduced a product improvement on the compressor in the past to
mitigate the concern. Vehicles equipped with this improvement are identified as Post-Clean Point.
Vehicles not equipped with this factory improvement are identified as Pre-Clean Point.
Pre-Clean Point and Post Clean Point Vehicles:
Lower than: VIN349849 – Assembly Number 6077076 = Pre-Clean Point
Higher than: VIN349849 – Assembly Number 6077076 = Post-Clean Point
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MAS004274

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Page 1 of 18

- SW PN MY17-20: 673014079
- SW PN MY21-24: 670295734
Pre-Clean Point vehicles:
• If available, perform an ASCM SW update and fill out ATTACHMENT A, replace only the compressor
(Component #4 in table 06.24-2) and continue with the checklist from steps 2 to 5 to verify that the
vehicle does not have any further anomalies present. Open a BOL as Factory Info.
• If no SW update is available for the ASCM: fill out ATTACHMENT A, replace only the compressor
(Component #4 in table 06.24-2) and continue with the checklist from point 2 to 5 to verify that
the vehicle does not have further anomalies. Open a BOL as Factory Info
Post-Clean Point vehicles:
• If available, perform the SW update of the ASCM control unit, carry out the checklist from points
1 to 5 to check that the car does not present any further anomalies. Open a BOL as Factory Info.
• If no SW update of the ASCM control unit is available, carry out the complete checklist from
point 1 to point 9. Open a BOL as Support request to share the diagnosis and define the cause of
the anomaly.
Labor Times:
For all vehicles:
- For step 4 of the checklist refer to procedure 06.24.001 - COMPLETE COMPRESSOR UNIT FOR AIR
SUSPENSION SYSTEM Air system leak test = 0.30 h.
- For step 5, if necessary, carry out procedure 00.20.034 – 35 - CAR HEIGHT CALIBRATION Recording
and checking with diagnostic tool, = 0.35 h.
- To carry out the SW update of the ASCM control unit: 6.90.001.9 = 0.30 h
- For the execution of the remaining steps of the checklist from points 1 to 5, 0.25 hours of extra-time
will be authorized in BOL using a specific code.
- For the execution of the complete checklist from points 1 to 9, 2 hours of extra-time will be authorized
in the BOL using a specific code.

CONSIDERATIONS: Open a BOL of the type requested based on the case history, attaching;
1) Scan of the completed diagnosis checklist or completed PDF document
2) Completed height table (Annex C: summary table of vehicle corner height measurements).
3) Any acquisitions required by the checklist performed with PicoScope (both in psdata and PDF
format) of the currents absorbed by the compressor, the reversing valves, and the angle valves
during the execution of the active "Vehicle Articulation Routine" and "Actuator Test" diagnoses”

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MAS004274

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Page 2 of 18

TECHNICAL SERVICE OPERATIONS

A SW update for the ASCM control unit is available which reduces air compressor operations with
the engine off minimizing high electrical current draw from the fuse:

TECHNICAL SERVICE OPERATIONS

Attachment A: Checklist
Preliminary questions: under what conditions did the anomaly occur?
a.

Loading conditions: number of passengers and cargo in the trunk. Answer:
____________________________________________________________________________________

b.

Vehicle speed. Answer:
_____________________________________________________________________________________

c.

Any additional notes on specific maneuvers or conditions that may have triggered the symptoms (i.e.
change in vehicle height). Answer
_____________________________________________________________________________________

d.

Was the suspension stiffness calibration set to rigid (hard) or soft (soft) mode via the button on the
central tunnel?
HARD

e.

SOFT

Was the Easy Entry/Exit feature active?
YES

NO

NOTE: After carrying out the Active Diagnoses reported in this diagnosis sheet, it is normal for the DTC
C2212-00 (621200) ECU in In Plant Mode to be stored in the ASCM control unit. Through the diagnosis tool,
select the ASCM module and carry out the active diagnosis ASCM > Active Diagnosis > Exit In-Plant Mode
function
STEPS TO BE CARRIED OUT:
1.

Is fuse F41 in the RDU (Rear Distribution Unit) blown?
YES

NO

-

If the answer is YES, replace it, then proceed with the steps below

-

If the answer is NO, proceed with the steps below

2.

With the engine running, manually level the vehicle using the appropriate button on the central
tunnel.
If the vehicle does NOT change height even after replacing the F41 fuse, check if the DTC C2212-00
(621200) ECU in In Plant Mode is stored. If this DTC is stored, enter the ASCM module with the diagnosis
tool and perform the Active Diagnosis > Exit in Plant Mode in the ASCM module

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MAS004274

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Page 3 of 18

YES

NO

Did the compressor make excessive noise during its operation?
YES

3.

NO

With the Diagnostic tool, through Active Diagnosis > Ride Height and Component Air Pressures & Mass
Readings of the ASCM module (see Figure 1), check the total air mass (Total System Air Mass) and the
system pressure (Tank Pressure parameter Air). The acceptable pressure value (Air Tank Pressure) is
between 5 bar and 12 bar. The acceptable value of total air mass of the system is between 109
bar·liter and 159 bar·liter. The nominal value is 129 bar liter.

Note: It is advisable to carry out this Active Diagnosis with the engine running. It is normal for the
message “Airmass Too Low” to appear as soon as the procedure is launched. In this situation it is
recommended to keep the engine running for at least a few minutes, then click on the Update button.
If the Active Diagnosis continues to return the “Airmass Too Low” message with all parameters = 0 (zero),
continue with the steps below.

Figure 1: air suspension system pressure reading with the Active Diagnosis of the ASCM ECU.

Figure 1: results of the system pressure reading Active Diagnosis.

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MAS004274

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Page 4 of 18

TECHNICAL SERVICE OPERATIONS

Was it possible to change the height of the Vehicle?

Carry out test 06.24.001 - COMPLETE AIR SUSPENSION SYSTEM COMPRESSOR UNIT - Air system air leak
test to check for any air leaks in the air suspension system: have any air leaks been found in the air
suspension system?
YES

NO

-

If the answer is YES, fix this leak first.

-

If the answer is NO, proceed with the steps below

5.

TECHNICAL SERVICE OPERATIONS

4.

Measure vehicle height at each corner. Carry out this height measurement as shown in Figure 3
reporting the results in the attached table in millimeters (mm).

Figure 3: measuring method of the Vehicle Height at each corner.

-

Do the corner heights of the same axle have a difference GREATER than 5 [mm] (example: left front
spring height: 450 mm; right front spring height: 460 mm)?
YES

NO

If YES, proceed from step 5.1; otherwise go to step 6.
5.1 Carry out the procedure in the Workshop Manual 00.20.034 – 35 - CAR HEIGHT CALIBRATION Recording and checking with a diagnostic tool.
5.2 Measure vehicle height at each corner as shown in Figure 3.
Note: Fill in the column shown in Table 1 of Annex C: summary table of vehicle height and angle
measurements
Manually level the vehicle and carry out 3 complete leveling cycles from Aero 2 to Off Road 2 and
back, verify that the system is operational and no DTCs appear/set

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MAS004274

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Below are the steps to carry out using the Diagnostic tool (MD EVO), continuation of the previous
section
6.

Carry out the Active Diagnosis > Pressure Vent Valve Actuator Test of the ASCM module three times,
as shown in Figure 4

The purpose of this step is to evaluate the functioning of the reversal valves (internal to the compressor),
the vent valve and the pressure sensor, which is located inside the valve block.
Using this diagnosis, the air circuit between the tank and the pressure sensor is forced to empty via the
vent valve.
The expected result on a properly functioning car is that:
- hear a hiss/vent sound
- the height of the four corners of the vehicle must not be reduced (tolerance 5 mm).
- the active diagnosis ends correctly.

Figure 4: Active Diagnosis > Pressure Vent Valve Actuator Test.

6.1 Did the procedure complete correctly?
YES

NO

If the active diagnosis does NOT end correctly, repeat it. In any case, continue from step 6.2
6.2 Was there a hissing/vent sound?
YES

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MAS004274

NO

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Page 6 of 18

TECHNICAL SERVICE OPERATIONS

Operations to be performed with MD-EVO

6.4 Have the heights on the 4 corners changed, compared to step 6, by more than 5 mm?
YES

7.

NO

Carry out the Active Diagnosis > Unload component in the ASCM module environment, selecting
the following settings:
-

Deflating Mode: Fixed short time deflating mode, as in Figure 5.

-

Deflating component: one at a time FL, FR, RL, RR, as in Figure 5.

The purpose of this step is to evaluate the operation of the vent valve and the valve of each air spring.
Using this diagnosis, the air circuit of the single air spring is forced to empty via the vent valve.
The expected result on a properly functioning car is that:
-

should hear a hiss/vent;

-

the heights of the 4 corners of the vehicle must be reduced by a value greater than 5 mm.

By carrying out this active diagnosis, individually, for all four air springs, it is possible to evaluate they are
functioning.

Figure 2: Active Diagnosis > Deflating Component into Ambience of the ASCM module.

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TECHNICAL SERVICE OPERATIONS

6.3 Measure the heights on the 4 corners (as shown in Figure 3), reporting the results in Table 1 of
Annex C: summary table of vehicle corner height measurements.

YES

NO

7.2 Measure vehicle height at each vehicle corner (as shown in Figure 3) reporting the results in Table 1
of Annex C: summary table of vehicle corner height measurements.
Have the heights on the 4 corners changed by more than 5 mm compared to point 7?
YES

NO

Note: As indicated in the “Considerations” section, proceed with points 8 and 9 only for Post-Clean
Point vehicles.
8.

Perform 10 operations from Off Road 2 to Aero 2 to stress the system. Return the car to ‘Normal’
'height level.

Carry out the active diagnosis ASCM > Active diagnosis > Vehicle Articulation Routine twice, as
described below.
Between the first and second runs, bring the car back to ‘Normal’ height level.
Before and after the first execution of the two necessary ones, record, in Table 2 of Annex C: summary
table of vehicle corner height measurements, the height of all the corners of the car.
This active diagnosis activates the individual springs both in extension and in compression, opening the
individual valves for a duration of 5 seconds, in the following order::
a.

Front left.

b.

Front right.

c.

Rear left.

d.

Rear right.

At the same time, in order to monitor the current absorbed by the compressor, the valve block and
reversing valves inside the compressor during the various actuations, it is necessary to measure the
current absorbed by these two system components, according to the methods described in Annex B:
compressor current absorption test. For this reason, therefore, point 8 must be repeated twice.
First execution of the active diagnosis:
a. Channel A: current absorbed by the compressor (B1: current absorbed by the compressor), and, at
the same time
b. Channel B: current absorbed by the valve block (B2: current absorbed by the valve block).
Second run of active diagnosis:
a. Channel A: current absorbed by the compressor (B1: current absorbed by the compressor), and, at
the same time
b. Channel B: current absorbed by the valve block (B3: current absorbed by the reversing valves)

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