Strategy Based Diagnostics
Review the system operations in order to familiarize yourself with
the system functions. Refer to
Differential Carrier Assembly Disassembled Views
and
Differential Carrier Assembly Description
and
Differential Lock System Description and Operation
in Rear Axle
Controls and
Transfer Case Description and Operation
in Transfer Case - Steyr. All diagnosis on a vehicle
should follow a logical process. Strategy based diagnostics is a
uniform approach for repairing all systems. The diagnostic flow may
always be used in order to resolve a system problem. The diagnostic
flow is the place to start when repairs are necessary. For a detailed
explanation, refer to
Strategy Based Diagnosis
in General Information.
Visual/Physical Inspection
| • | Inspect the easily accessible or visible system components for
obvious damage or conditions, which could cause the symptom. |
| • | Check for the correct lubricant level and the proper viscosity. |
| • | Verify the exact operating conditions under which the concern
exists. Note factors such as vehicle speed, road conditions, ambient temperature,
and other specifics. |
| • | Compare the driving characteristics or sounds, if applicable,
to a known good vehicle and make sure you are not trying to correct a
normal condition. |
| • | Factors that may contribute to an inoperative rear differential
include: |
| - | Differential inoperative due to antilock brake system (ABS) function |
| - | Inoperative powertrain control module (PCM) and/or wiring system |
| - | A mini spare or different size tire installed |
| - | A fluid over-temperature condition |
| - | An inoperative or "stuck" clutch pump check valve |
| - | A defective rear differential assembly |
| - | An inoperative transfer case assembly |
Intermittent
Test the vehicle under the same conditions that the customer reported
in order to verify the system is operating properly.
Symptom List
Refer to a symptom diagnostic procedure from the following list in
order to diagnose the symptom:
