per mile is 426, and the maximum is 567. The ECU will set diagnostic trouble codes if the number or revolutions are out of this range.
In addition, the size of the steer axle tires compared to the drive axle tires also has to be within the ABS system design. To avoid diagnostic trouble codes, the ratio of the effective rolling circumference of the steer axle, divided by the effective rolling circumference of the drive axle, must be between 0.85 to 1.15.
ABS PARTIAL SHUTDOWN
Depending which component the trouble code is detected on, the ABS and ATC functions may be fully or partially disabled. Even with the ABS indicator lamp on, the EC- 60™ controller may still provide ABS function on wheels that are not affected. The
Steer Axle ABS Modulator Diagnostic Trouble Code
ABS on the affected wheel is disabled. ABS and ATC on all other wheels remains active.
Drive Axle/Additional Axle ABS Modulator Diagnostic Trouble Code
ATC is disabled. ABS on the affected wheel is disabled. ABS on all other wheels remains active.
Drive Axle/Additional Axle Wheel Speed Sensor Diagnostic Trouble Code
ATC is disabled. In a four sensor system, ABS on the affected wheel is disabled, but ABS on all other wheels remains active.
In a six sensor system, ABS remains active by using input from the remaining rear wheel speed sensor on the same side.
ATC Modulator Diagnostic Trouble Code
ATC is disabled. ABS remains active.
J1939 Communication Diagnostic Trouble Code
ATC is disabled. ABS remains active.
ECU Diagnostic Trouble Code
ABS and ATC are disabled. The system reverts to normal braking.
Voltage Diagnostic Trouble Code
While voltage is out of range, ABS and ATC are disabled. The system reverts to normal braking. When the correct voltage level is restored, full ABS and ATC function is available. Operating voltage range is 9.0 to 17.0 VDC.
Steer Axle Wheel Speed Sensor Diagnostic
Trouble Code
The wheel with the diagnostic trouble code is still controlled by using input from the remaining wheel speed sensor on the front axle. ABS remains active on the rear wheels. ATC is disabled.
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