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 when the exhaust pipe or
muffler is damaged 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

M1151007000279

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 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

M1151007100276

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 TOOL

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, catalytic converters
and muffler for damage.

Q: Are the pipes, catalytic converters and muffler

damaged?
YES :

Replace, then go to Step 1 (For the removal

of the catalytic converter, refer to GROUP
17

P.17-70

NO :

There is no action to be taken.

SPECIAL TOOL

M1151000600281

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MD998770
Oxygen sensor wrench

MD998770-01 or General
service tool

Removal and installation
of heated oxygen sensor

ON-VEHICLE SERVICE

TSB Revision

INTAKE AND EXHAUST

15-4

ON-VEHICLE SERVICE

INTAKE MANIFOLD TUNING SYSTEM CHECK

M1151001700032

1. Warm up the engine.
2. Disconnect the vacuum hose from the vacuum actuator, and

then connect a vacuum gauge via the Tee-fitting.

3. Start the engine and verify that a vacuum is applied to the

vacuum gauge.

4. As described in the chart below, vary the engine speed to

inspect the vacuum conditions. During this inspection, verify
that the rod of the vvacuuml actuator is operating.

INTAKE MANIFOLD TUNING SOLENOID CHECK

M1151010000020

1. Disconnect the vacuum hoses from the intake manifold

tuning solenoid.
NOTE: When disconnecting the vacuum hose, always make
sure that it can be reconnected at its original position.

2. Disconnect the harness connector.
3. Connect a hand vacuum pump to nipple (B) of the ntake

manifold tuning solenoid.

4. As described in the chart below, check airtightness by

applying a vacuum with voltage applied directly from the
battery to the ntake manifold tuning solenoid, and without
applying voltage.

ENGINE SPEED

NORMAL
CONDITION

CONTROL
VALVE

3,750 rpm or less

Vacuum
maintained

Closed

Form 3,750 rpm or less,
engine is suddenly

Vacuum not
change

Closed

4,050 rpm or more

Vacuum leaks

Open

AK200808

INTAKE MANIFOLD
TUNING SOLENOID

VACUUM
GAUGE

VACUUM ACTUATOR

BATTERY POSITIVE
VOLTAGE

NIPPLE (A)
CONDITION

NORMAL
CONDITION

Applied

Open

Vacuum leaks

Closed

Vacuum
maintained

Not applied

Open

Vacuum leaks

AK102947

AK102947AB

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