- Begin the system diagnosis by reviewing the Driveline Disassembled Views and Driveline Support Assembly Description . Reviewing the description and operation information will help you determine the correct diagnostic procedure when a malfunction exists. Reviewing the description and operation information will also help you determine if the condition described by the customer is normal operation.
- Perform a visual and physical inspection of the following:
- Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.
- Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
| • | Inspect for aftermarket devices, which could affect the operation of the vehicle. Refer to Checking Aftermarket Accessories in Wiring Systems. |
| • | Inspect the easily accessible or visible system components for obvious damage or conditions, which could cause the symptom. |
| • | 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. |
| • | Diagnostic Starting Point - Vibration Diagnosis and Correction in Vibration Diagnosis and Correction |
| • | Diagnostic Starting Point - Rear Drive Axle in Rear Drive Axle |
| • | Noisy in Drive in Rear Drive Axle |
| • | Noisy When Coasting in Rear Drive Axle |
| • | Intermittent Noise in Rear Drive Axle |
| • | Constant Noise in Rear Drive Axle |
| • | Noisy on Turns in Rear Drive Axle |
Cause | Correction | ||||||
|---|---|---|---|---|---|---|---|
Loose propeller shaft hub clamp bolt - automatic transmission only | A loose propeller shaft hub clamp bolt may create a "rattle" type noise, mainly at idle, in the flywheel area of the transmission housing. Tighten the hub clamp bolt or replace the components as required. | ||||||
Balance weight detached from the propeller shaft | A detached balance weight may create a "sliding, scraping, or ticking" type noise during acceleration or deceleration.
| ||||||
Propeller shaft rev limiter, snubber, contacting the driveline tube - manual transmission only A propeller shaft overspeed condition may occur when the driver selects too low a gear for the current vehicle speed. | A rev limiter, snubber, that is contacting the driveline tube may create a "moaning" type noise and/or vibration that is felt through the shift lever. Slight noise and vibration is to be considered normal during an overspeed condition but should not be present when the overspeed condition has ceased. Replace components as required. | ||||||
Bearing noise within the driveline assembly | A "whirring or squealing" type noise will increase or decrease relative to the vehicle speed and may be caused by a worn bearing. A MINOR "whirring" type noise should be considered normal. Replace the bearings as required. | ||||||
Broken or missing snap ring on the hub of the rear bearing housing assembly - manual transmission only | A broken or missing snap ring on the rear bearing housing may allow the propeller shaft assembly to move forward in the driveline tube. In those situations, the shoulder of the input shaft will contact the outer race of the clutch pilot bearing and create a "squealing or squeaking" type noise with the clutch pedal depressed. Repair or replace components as required. | ||||||
Loose flexplate bolts or a damaged flexplate - automatic transmission only | A flexplate that is cracked or that has loose retaining bolts may create a "clicking, clanking, or snapping" type noise in the transmission housing. Replace the components as required. | ||||||
Propeller shaft "out-of-balance" condition | A propeller shaft "out-of-balance" condition may create a vibration and be caused by:
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