Symptoms - Rear Differential Carrier

Symptoms - Rear Differential Carrier

Strategy Based Diagnostics

Review the system operations in order to familiarize yourself with the system functions. Refer to Rear Drive Axle Description and Operation Description and Operation , and Transfer Case Description and Operation Transfer Case Description and Operation. 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 Strategy Based Diagnosis.

Visual/Physical Inspection

* Inspect for aftermarket devices, which could affect the operation of the vehicle. Refer to Checking Aftermarket Accessories Checking Aftermarket Accessories.

* 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.

* Inspect for all-wheel drive activation and operation. Refer to All-Wheel Drive (AWD) System Functional Inspection All-Wheel Drive (AWD) System Functional Inspection.

* Factors that may contribute to an inoperative rear differential include:

- Low gear oil levels

- 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:

* Symptoms - Vehicle Symptoms - Vehicle

* All-Wheel Drive (AWD) System Functional Inspection All-Wheel Drive (AWD) System Functional Inspection

* Noisy in Drive Noisy in Drive

* Noisy When Coasting Noisy When Coasting

* Intermittent Noise Intermittent Noise

* Constant Noise Constant Noise

* Noisy on Turns Noisy on Turns

* Rear Differential Carrier Leak Diagnosis Rear Differential Carrier Leak Diagnosis