42-080 ABS Wheel Speed Fault Code Correction
for MBSP Equipped Vehicles

TSB-42-080-FTL

Creation Date:2024-05-13

Engine or Vehicle Affected:
> New Cascadia

This is an informational bulletin only. If the described condition exists, base warranty or extended warranty
applies.

Described Condition

This bulletin only applies to New Cascadia vehicles that were built after September 9, 2019, and are experiencing
repetitive occurrence rear axle ABS fault codes. The following instructions provide information on how to
diagnose and fix the ABS codes, thereby reducing the chances of future contamination that could lead to more
fault codes. They also offer supplementary and improved guidelines for diagnosis and repair.

NOTE: Ensure that the ABS software is updated to the latest version. To update the software version, go to

https://www.zf.com/products/en/cv/footer/downloads/downloads.htm|#accordeon_1_664701_0 and download
the file ‘mBSP Flash Tool’ of TP19072.

Verifying the ABS Wheel Speed Fault Code

1. _ Park the vehicle on a level surface, place the vehicle in neutral, shut down the vehicle, and set the park brake. Chock the tires.
2. Open DiagnosticLink® and connect to the vehicle.
3. Ensure that DiagnosticLink is updated to the latest version (8.19 at time of publication) or newer.

4. Are any of the following Table. Fault SPNs 1 active/inactive fault SPNs present?
Table 1, Fault SPNs

SPN 791 Left Forward differential
SPN 792 Right Forward differential
SPN 793 Left Rear Differential
SPN 794 Right Rear Differential

Table 1, Fault SPNs

a. YES — Go to Step 5

b. — NO — No action required.

1¢ Note: FMI 1 and FMI 7 are also triggered due to rear drive axle ABS harness
failures.

5. Are either of the following Table. 2 fault FMls present?
Table 2, Fault FMI

FMI1 Reflects an air gap failure

FMI7 Reflects a tone wheel failure

Table 2, Fault FMI

a. — YES — Go to ‘Inspection of Harness Displayed as Faulted in DiagnosticLink’.

b. NO This service bulletin doesn't apply.

Inspection of the Harness Displayed as Faulted in DiagnosticLink

6. Are the wheel speed sensor and air gap between the sensor and tone ring (0.04-inch max) warped?
a. YES — Repair and replace as needed

b. NO — Go to step 7.

1¢ Note: Go to

https://www.zf.com/products/en/cv/home/cv.html and search ‘TP2303’ for
troubleshooting instructions.

7. Test the resistance at wheel speed sensor (WSS). Is the resistance between 900 to 2000 ohms?
a. YES — Goto step 8
b. — NO — Replace the sensor.

8. Test the WSS voltage. Is the sensor voltage at least 0.2 VAC at 30 RPM?
a. YES — Voltage and resistance meets the specifications, reconnect WSS. Go to step 9.
b. NO — Replace the sensor. Go to step 9.

9. Test the resistance from the ABS module to the WSS.
a. | Ifthe resistance is not within 1 ohm of the wheel speed sensor reading, go to step 10.
b. | If resistance is within 1 ohm of the wheel speed sensor reading, go to step 11

10. Check the wire integrity from the WSS to ECU.

@. If the resistance is not within 1 ohm of the wheel speed sensor reading, go to step 12.

b. “Ifthe resistance is within 1 chm of the wheel speed sensor reading, go to step 11

11. Refer to DiagnosticLink. Are there any active air gaps, tone rings, and adjustment codes?

a. YES — Check the tone rings. (Jack up the wheel and spin while inspecting the tone ring or chart with DiagnosticLink and drive. A
tone ring will show up as weak compared to the rest of the wheel speeds). See Table. Wheel Speed Chart Signals 3. Fix as needed. Go
to step 12. The only part that needs to be replaced is the rotor due to rust jacking

b. NO — Go to step 12.

12. Does this only happen in damp or wet weather conditions?

a. YES — Go to step 15a.

b. NO - Go to step 13.

13. During the test drive, monitor the wheel speeds using DiagnosticLink and ensure that the ABS module and all J1939 connections are
active. Do the wheel speeds appear erratic, spike up, or show readings when the vehicle is stationary? It is recommended to refer to the chart

instead of the ABS tab/panel. See Table. Wheel Speed Chart Signals 3 and Fig. 1 for the charting selections in DiagnosticLink.
Table 3, Wheel Speed Chart Signals

Device/Module Signal Name
ABS Wheelspeed Wheel 1
ABS Wheelspeed Wheel 2
ABS Wheelspeed Wheel 3
ABS Wheelspeed Wheel 4
ABS Wheelspeed Wheel 5
ABS Wheelspeed Wheel 6
ABS Wheelspeed Wheel 7
ABS Wheelspeed Wheel 8
J1939-11 Relative Wheelspeed; Front Axle,
Left Wheel
J1939-11 Relative Wheelspeed; Front Axle,
Right Wheel
J1939-11 Relative Wheelspeed; Rear Axle 1,
Left Wheel

Device/Module Signal Name

J1939-11 Relative Wheelspeed; Rear Axle 1,
Right Wheel

J1939-11 Relative Wheelspeed; Rear Axle 2,
Left Wheel

J1939-11 Relative Wheelspeed; Rear Axle 2,
Right Wheel

Table 3, Wheel Speed Chart Signals

14. See Fig. 2 for the traces of the selected wheel speed and relative speed signals. Note the erratic signal on wheel speed 6

DiagnosticLink Wheel Speed and Relative Speed Signals

95102/2024 1121533,

Fig. 1, DiagnosticLink Wheel Speed and Relative Speed Signals
DiagnosticLink Signal Traces

Wheelspeed 6 Erratic

Al)

95702/2024 121834

Fig. 2, DiagnosticLink Signal Traces

a. | If the readings are erratic regardless of location, or if the issue only happens in damp or wet conditions, install the individual overlays

for all four rear wheel ends. See Table. WABCO Harness Part Numbers 4 for length and part number of WABCO harnesses.
Table 4, WABCO Harness Part Numbers

b.

WABCO Part Part Description Length
Number

WAB 449 711 23-13666-050 Cable-ABS 5 meters
0500 Sensor

WAB 449 711 23-13666-060 Cable-ABS 6 meters
0600 Sensor

WAB 449 711 Extension Cable 6.5 meters
0650

WAB 449 711 23-13666-080 Cable-ABS 8 meters
0800 Sensor

WAB 449 711 23-13666-1000 Cable-ABS 10 meters
1000 Sensor

Table 4, WABCO Harness Part Numbers

All harnesses listed above in Table. WABCO Harness Part Numbers 4 will require termination at the bulkhead connector BHB. See Fig.
3 and Fig. 4 for bulkhead connector BHB location.

WAECO ABS Harness

05/02/2024 #548517
Fig. 3, WABCO ABS Harness
Bulkhead Connector BHB Location

05/02/2024 / 548518
Fig. 4, Bulkhead Connector BHB Location

C. _ The lengths of the WSS overlay harness required will vary based on the wheelbase of the vehicle. See ‘Determine Vehicle Wheelbase’
below.

d. —Allthe harnesses listed in Table. WABCO Harness Part Numbers 4 will require trimming to length and termination at the 76-pin
bulkhead connector BHB. See Fig. 3 for image of a typical WABCO ABS Harness and Fig. 4 for bulkhead connector BHB location.

€. Choose the closest available harness length in order to minimize harness waste when trimming to length

f. Installation of the terminal part number 23-13211-410 (Qty: 8 Nos.) requires crimping tool SPX J-38125-6 (non-ratcheting) or SPX J-
38125-7 (ratcheting).

Q. During the harness replacement, ensure that the 76-pin bulkhead connector BHB is free from moisture or corrosion. If moisture is
detected, clean the connector using compressed air and dielectric spray. If corrosion is found, note that repairs for additional circuits
fall outside the scope of this service bulletin.

h. Install the overlay harness within the left frame hand rail and secure as needed. After trimming the overlay harness to length, strip
insulation, then crimp on new terminal at BHB connector. For all harnesses, only one terminal part number 23-13211-410 is needed, and
it remains consistent across all. Keep the original wire twist of the overlay harness as close as possible to the respective terminal
location of the bulkhead connector BHB.

i. "Verify that the terminals are installed into the correct cavity of the 76-pin bulkhead connector BHB. See Fig. 5.

BulkHead Connector BHB

ID: |CHAS_F_H_DASH_BHB_1B
PN: |23-13153-016 REF 1,
SEALED CONNECTOR ‘:
cav|cir#
23. |377LA-# 1701 (BK) e| 32-.
24 |377LR-#1701(BK) @
25 |378LRO # 1701 (DKBL)
34 |378LAl # 1701 (BR)

35 |377LA+#1701(BR) @
37 |378LRI# 1701 (BR)

40 |377LR+#1701(BR) @
41 |378LAO # 1701 (DKBL)
146 |378RAI # 1701 (BR) “
47 |377RA-# 1701 (BK)
48 |377RR-# 1701 (BK)
49 |378RRI# 1701 (BR)
58 |378T-# 1701 (BR)
59 _|378T+ # 1701 (DKBL)
60 |378RAO # 1701 (DKBL)
61 |377RA+ # 1701 (BR)
62 |377RR+ # 1701 (BR)
63 |378RRO # 1701 (DKBL)

«

wp 4a

~45

05/02/2024 #548519
Fig. 5, BulkHead Connector BHB

Determine Vehicle Wheelbase

15. Log onto
DTNA Portal

16. Enter the vehicle VIN or serial number in the search bar of the box titled ‘Vehicle Info; and select ‘Go to Vehicle Info’

17. Find the vehicle wheelbase, once the results have loaded, and determine the replacement harness length. See Fig. 6.
Vehicle Wheelbase