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

TSB-42-080-FTL

Creation Date:2024-05-13
Last Revision Date:2024-08-28

Engine or Vehicle Affected:

» New Cascadia

Description of Revisions: This bulletin replaces the version dated
07/17/2024. Added metadata for fault code.
This is an informational bulletin only. If the described condition exists, base warranty or extended warranty
applies.

Described Condit

This bulletin only applies to New Cascadia vehicles that were built after September 9, 2019, and are experiencing
repetitive occurrence rear axle antilock brake system (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: Confirm the ABS ECU part number is one of the following. See Table 1.

Table 1, ECU Part Numbers

400 864815 | 400864821 |400864825 |400867178 | 400867183 |/400 867130 | 400 867113
0 0 0 0 0 0 0

400 864816 | 400864822 |400864826 |400867179 | 400867184 |/400 867131 | 400 867114
0 0 0 0 0 0 0

400 864817 | 400864823 |400864827 |400867180 |/400867185 /400 867132 | 400 867115
0) 0 0 0 0 0 0

400 864818 | 400864824 |400 864828 |400867181 |400 867186 | 400867133 | 400 867116
0 0 0 0 0 0 0

400 867119 | 400867128 |400867135 |400 864836 | 400864841 |/400867101 | 400 864 801
0 0 0 0 0 0 0

400 867120 | 400867129 |400 867136 |400 864867 | 400864842 / 400867102 | 400 864 802
0 0 0 0 0 0 0

400 867121 |400867125 | 400867137 / 400864838 | 400 864843 | 400867103 | 400 864 803
0 0 0 0 0 0 0
400 867122 |400867126 |400867138 |400864839 | 400 864844 | 400867104 | 400 864 804
0 0 0 0 0 0 0

Table 1, ECU Part Numbers

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.html#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 active/inactive fault SPNs present? See Table Fault SPNs 2 active/inactive fault SPNs present?

Table 2, Fault SPNs

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

a. YES — Go to Step 5.

b. NO

> No action required

Table 2, Fault SPNs

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

failures.

5. | Are either of the following fault FMIs present? See Table 3, fault FMIs present?

Table 3, Fault FMI

FMI1

Reflects an air gap failure

FMI7

Reflects a tone wheel failure

Table 3, Fault FMI

@. — 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.

w 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 — Go to step 8.
b. — NO — Replace the sensor.
8. | Test the WSS voltage. |s 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.
. If the resistance is not within 1 ohm of the wheel speed sensor reading, go to step 10
b. | Ifresistance 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 ohm 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?

@. 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 4. Fix as needed. Go
to step 12. The only part that needs to be replaced is the rotor due to rust jacking.

b. — NO Goto step 12.
12. | Does this only happen in damp or wet weather conditions?

a. YES — Goto step 14a.

b. NO- Goto 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 4 and Fig. 1 for the charting selections in DiagnosticLink.

Table 4, 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
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 4, 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.

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Wheel 10 Read: Wheelspeed 10
Wheel 1 Read: Wheelspeed 1
Wheel 2 Read: Wheelspeed 2
Wheel 3 Read: Wheelspeed 3
Wheel 4 Read: Wheelspeed 4
Wheel 5 Read: Wheelspeed 5
Nheel 6 Read: Wheelspeed 6
Wheel 7 Read: Wheelspeed 7
Wheel 8 Read: Wheelspeed 8
Wheel 9 Read: Wheelspeed 9

1 Angle Sensor (App_0003)

+SAM (App_0709)

#1 (ROLLCALL) 110745 77:08:00 11:08:15 17:08:30 1
s - System Controller (ROLLCALL) 10736234

d; Front Axle, Left Whee! €

d; Front Axle, Right Wheel | & View Selection ®, Zoom in ®% Zoom Out ®, View All | fill Re-tile [i] All Full [/}
d; Rear Axle #1, Left Wheel

d; Rear Axle #1, Right Wheel Description Device Value Unit Min(Ob

d; Rear Axle #2, Left Wheel
d; Rear Axle #2, Right Wheel
ft Wheel Speed

ht wheel speed

wheel speed

it wheel speed

| Fig. 1, DiagnosticLink Wheel Speed and Relative Speed Signals |

peed 6 Erratic

i Re-tile (An Full (9) Labels |i Data Points

Device Value Unit Min(Observ Max(Observed)

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 5 for length and part number of WABCO harnesses.

Table 5, WABCO Harness Part Numbers