| Diagnosis and Testing Inspection and Verification - Verify the customer concern.
- Visually inspect for obvious signs of mechanical damage.
Visual Inspection Chart | Mechanical | - Collapsed pipe(s)
- Air cleaner
- Air cleaner element
- Air cleaner element minder gauge
- Charge air cooler
| - If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, verify the symptom and refer to WDS to diagnose the system.
Component Test Air Cleaner Element NOTE:Extremely moist operating conditions may produce a false reading in the air cleaner element minder gauge. If a new air cleaner element has been installed recently, the yellow plunger in the air cleaner element minder gauge should be near or in the red zone until reset by pressing the yellow button on the top of the air cleaner element minder gauge. The yellow plunger should then return to the top of the green zone. NOTE:The air cleaner element component test should only be carried out if the yellow plunger has reached the bottom line of green zone, or is in the clear or red zones. Carry out the following test to determine if a new air cleaner element should be installed . - Press the yellow button on the top of the air cleaner element minder gauge and hold for 3 seconds to reset it.
- Start the engine. and gently raise and hold the engine speed to 4000 rpm for approximately 15 seconds.
- If the yellow plunger returns to the bottom line of the green zone, or to the clear or red zones, INSTALL a new air cleaner element and RESET the air cleaner element minder gauge.
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