Pinpoint Tests

Pinpoint Tests

NOTE:
These Pinpoint Tests are designed to take the technician through a step-by-step diagnosis procedure to determine the cause of a condition. It may not always be necessary to follow the chart to its conclusion. Carry out only the Pinpoint Test steps necessary to correct the condition. Then check operation of the system to make sure the condition is corrected.
After verifying that the condition has been corrected, make sure all components removed have been installed.

PINPOINT TEST G1058328p1 : HIGH-SPEED SHAKE

G1058328t1 : NEUTRAL COAST
1 Carry out the neutral coast test.
- Does the vibration disappear during the neutral coast test?

->Yes
Check and install/re-balance wheels and tires and driveshaft. Check and install new engine/transmission mounts as necessary. Repeat Road Test as outlined.

->No
GO to Pinpoint Test G1058328t8.

PINPOINT TEST G1058328p2 : TIP-IN MOAN

G1058328t2 : CHECK THE AIR CLEANER
1 Check the air cleaner.
- Check the air cleaner, inlet tube, outlet tube, resonators and all other components associated with the air induction system for correct installation and tightness of all connections.
- Are the components OK?

->Yes
GO to Pinpoint Test G1058328t3.

->No
Correct the condition. Repeat the Road Test as outlined.

G1058328t3 : CHECK THE EXHAUST SYSTEM
1 Carry out the exhaust system neutralizing procedure in this article.
- Is the exhaust system OK?

->Yes
GO to Pinpoint Test G1058328t4.

->No
Repair as necessary. Restore vehicle. Repeat the Road Test as outlined.

G1058328t4 : CHECK THE POWER STEERING
1 Remove the auxiliary drive belt and test for tip-in moan.
- Is the tip-in moan OK?

->Yes
Repair the power steering as necessary. For additional information, refer to Section 211-00.

->No
Check and install new engine/transmission mounts as necessary. Repeat Road Test as outlined.

PINPOINT TEST G1058328p3 : IDLE BOOM/SHAKE/VIBRATION/SHUDDER

G1058328t5 : CHECK CABLE/HOSES
1 Check the engine compartment for any component that may be grounding between the engine and body or chassis. Example: air conditioning (A/C) hoses.
- Are the components OK?

->Yes
GO to Pinpoint Test G1058328t6.

->No
Correct the condition. Repeat the Road Test as outlined.

G1058328t6 : CHECK THE COOLING RADIATOR
1 Check the engine cooling radiator mountings and bushings for security and condition. Check the radiator installation for any component that may have a touch condition.
- Are the installation and bushings OK?

->Yes
GO to Pinpoint Test G1058328t7.

->No
Correct the condition. Repeat the Road Test as outlined.

G1058328t7 : CHECK THE EXHAUST SYSTEM
1 Carry out the exhaust system neutralizing procedure in this article.
- Is the exhaust system OK?

->Yes
Check and install new engine/transmission mounts as necessary. Repeat Road Test as outlined.

->No
Repair as necessary. Repeat Road Test.

PINPOINT TEST G1058328p4 : WHEEL END VIBRATION ANALYSIS

G1058328t8 : INSPECT THE TIRES
1 Inspect the tires.
- Raise and support the vehicle. For additional information, refer to Jacking Jacking
For additional information, refer to Lifting
- Inspect the tires for:
- Correct tire size
- Tire/wheel compatibility
- Wear or damage
- Tire beads correctly seated
- Are the tires OK?

->Yes
GO to Pinpoint Test G1058328t9.

->No
Inspect the wheels. For additional information, refer to Section 204-00.

G1058328t9 : INSPECT WHEEL BEARINGS
1 Inspect the wheel bearings. For additional information, refer to Section 204-00.
- Are the wheel bearings OK?

->Yes
GO to Pinpoint Test G1058328t10.

->No
Repair as necessary. Repeat the Road Test as outlined.

G1058328t10 : INSPECT THE CONSTANT VELOCITY (CV) JOINT BOOTS
1 Inspect the CV joint boots.
- Spin the rear tire by hand
- Inspect for evidence of cracks, tears, splits or splattered grease
- Are the CV joint boots OK?

->Yes
GO to Pinpoint Test G1058328t11.

->No
Repair as necessary. Repeat the Road Test as outlined.

G1058328t11 : INSPECT WHEEL AND TIRE RUNOUT
1 Inspect the wheel and tire runout.
- Carry out the Wheel and Tire Check procedure. For additional information, refer to Wheels and Tires
- Is the wheel and tire runout OK?

->Yes
Balance the wheels and tires. Refer to the wheel balance equipment manufacturers instructions.

->No
Repair as necessary. For additional information, refer to Wheels and Tires Repeat the Road Test as outlined.

PINPOINT TEST G1058328p5 : NON-AXLE NOISE

G1058328t12 : INSPECT VEHICLE TRIM
1 Check the grille and trim mouldings to see if they are the source of the noise.
- Are the vehicle trim components causing the noise?

->Yes
Install new trim or repair as necessary. For additional information, refer to Section 501-08.

->No
GO to Pinpoint Test G1058328t13.

G1058328t13 : CHECK THE A/C SYSTEM FOR NOISE
1 Check the A/C system components for noise by turning the A/C system on and off.
- Is the A/C system causing the noise?

->Yes
Diagnose the A/C system. For additional information, refer to Climate Control System

->No
GO to Pinpoint Test G1058328t14.

G1058328t14 : CHECK NON-FACTORY ACCESSORIES
1 Inspect any accessories for being the source of the noise. Example: grounding body-to-frame, antennas, visors, bug deflectors and fog lights?
- Are the accessories the cause of the noise?

->Yes
Adjust, repair or install new accessories or fasteners as required.

->No
Verify the customer concern.