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
Locking Differential Description and Operation
in Drive Axle -
Locking/Limited Slip 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 condition. 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:
