PART 8: MAINTENANCE AND SERVICE
PB1319 (CAT. NO. 5296 ) —156— 22-01691 (R02/02)
• Lubricating System. Check the oil lines, housing, and connections. Look for
leaks, damage, or deterioration. Leaks could mean you have damaged oil
lines or oil seals.
• High Frequency Vibration. Vibration may indicate turbo rotor imbalance.
Have your dealer investigate this immediately.
Exhaust System
Details of inspection and maintenance of your exhaust system are covered
below, under Noise Control System. Check the Index for page reference.
Anti-lock Braking System (ABS)
For details of use and maintenance of your anti-lock system, see the anti-lock
braking system service literature that came with your truck.
Some general notes on repairing your anti-lock braking system:
• The foundation brake system must be in proper working order to ensure the
best ABS performance.
• Before welding anywhere on the vehicle, detach the ABS ECU connector and
all other electronic control units.
• Never detach the ECU connector with the ignition turned on.
• Do not attempt to repair ABS/ATC electrical cables that are outside the vehi-
cle. Replace faulty cables as an assembly.
• When servicing brakes, hubs, or axle, recoat the ABS sensors with anti-seize
compound. Ensure the sensor is pushed against the pulse wheel after the
hub is reinstalled. On rear axles, push the sensor fully into the mounting
block before reinstalling the hub.
• Check ABS wiring harnesses and piping periodically for chafing or other
problems. No regular maintenance is required on the ABS components.
• During wheel balancing, dyno testing, or any time the ignition is on with part of
the ABS disconnected, a failure code will be recorded. After servicing or testing
of the vehicle is completed, clear this code.
If, due to operating conditions, a brake application causes either wheel on the
same axle to begin skidding, wheel speed sensors immediately signal the anti-
lock controller in the modulator assembly. The controller responds instantly by sig-
naling the solenoids in the modulator which activate the air valves, reducing appli-
cation pressure as needed to prevent the wheels from locking up. If this over-
riding correction is effective, application pressure is allowed to build up to the orig-
inal input.
Any malfunction of the anti-lock system on one or more axles will cause the sys-
tem to fail-safe, and the panel-mounted amber warning light will come on, indi-
cating both a malfunction, and automatic shut-down of the system. If the air
system is intact (indicated by the pressure gauges), the service brakes will con-
tinue to function normally, but without benefit of the anti-lock feature.
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