Intake leaks usually create driveability issues that
are not obviously related to the intake system.
Exhaust leaks or abnormal noise is caused by
cracks, gaskets and fittings, or by exhaust pipe or
muffler damage due to impacts during travel. The
exhaust leaks from these sections and causes the
exhaust noise to increase. There may be cases
when the system contacts the body and vibration
noise is generated.

TROUBLESHOOTING STRATEGY

M1151007000321

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find an
intake or exhaust system fault.
1. Gather information from the customer.

2. Verify that the condition described by the

customer exists.

3. Find the malfunction by following the Symptom

Chart.

4. Verify malfunction is eliminated.

SYMPTOM CHART

M1151007100328

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Exhaust Leakage

DIAGNOSIS

STEP 1. Start the engine. Have an assistant stay
in the driver’s seat. Raise the vehicle on a hoist.
Have the assistant rev the engine while
searching for exhaust leaks.

Q: Is the exhaust leaking?

YES :

Go to Step 2.

NO :

The procedure is complete.

STEP 2. Check the gasket for cracks, damage.

Q: Is the gasket damaged?

YES :

Replace the gasket, then go Step 1.

NO :

Go to Step 3.

STEP 3. Check for loosening in each coupling
section.

Q: Is there any loosening in each section?

YES :

Tighten, then go to Step 1.

NO :

There is no action to be taken.

SYMPTOM

INSPECTION PROCEDURE

REFERENCE PAGE

Exhaust Leakage

P.15-2

Abnormal Noise

P.15-3

SPECIAL TOOLS

TSB Revision

INTAKE AND EXHAUST

15-3

INSPECTION PROCEDURE 2: Abnormal Noise

DIAGNOSIS

STEP 1. Start the engine. Have an assistant stay
in the drivers seat. Raise the vehicle on a hoist.
Have the assistant rev the engine while
searching for exhaust leaks.

Q: Is any abnormal noise generated?

YES :

Go to Step 2.

NO :

The procedure is complete.

STEP 2. Check for missing parts in the muffler.
Tap the muffler lightly to check for loose baffles,
etc.

Q: Are there any missing parts in the muffler?

YES :

Replace, then go to Step 1.

NO :

Go to Step 3.

STEP 3. Check the hanger for cracks.

Q: Is the hanger cracked?

YES :

Replace, then go to Step 1.

NO :

Go to Step 4.

STEP 4. Check for interference of the pipes and
muffler with the body.

Q: Are the pipes and muffler interfering with the

body?
YES :

Repair, then go to Step 1.

NO :

Go to Step 5.

STEP 5. Check the heat protectors.

Q: Are any heat protectors loose or damaged?

YES :

Tighten or replace, then go to Step 1.

NO :

Go to Step 6.

STEP 6. Check the pipes and muffler for damage.

Q: Are the pipes and muffler damaged?

YES :

Replace, then go to Step 1.

NO :

There is no action to be taken.

SPECIAL TOOLS

M1151000600429

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MD998412
Guide

MD998412

Installation of intake
manifold plenum

MB991953
Oxygen sensor wrench

Removal and installation
of heated oxygen sensor

MD998770
Oxygen sensor wrench

MD998770-01 or General
service tool

Removal and installation
of heated oxygen sensor

B991953

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