Mitsubishi Galant. Manual — part 380

EMISSION CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-90

<3.0L ENGINE>

COMPONENT LOCATION

M1173007600020

AKX00353

VACUUM CONTROL VALVE

ON

OFF

EGR
SOLENOID

MFI RELAY

BATTERY

PCM

VOLUME AIR FLOW
SENSOR

ENGINE COOLANT
TEMPERATURE SENSOR

CRANKSHAFT POSITION
SENSOR

EGR
VALVE

AB

AKX01312 AB

EGR SOLENOID
<2.4L ENGINE>

AKX01313AB

EGR VALVE
<2.4L ENGINE>

EMISSION CONTROL

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ENGINE AND EMISSION CONTROL

17-91

EGR SYSTEM CHECK

M1173002600058

1. Disconnect the vacuum hose (black) from the EGR valve,

and then connect a hand vacuum pump via the Tee-fitting.

2. Start the engine. Check the vacuum condition when the

throttle valve is opened suddenly (revving) during cold and
hot engine conditions. If the engine is hot and the vacuum
does not rise over 13 kPa (3.9 in Hg), perform the vacuum
control valve check and EGR port vacuum check. Then
continue to Step 3. If vacuum rises momentarily, proceed to
Step 3.

When engine is cold
[Engine coolant temperature: 20

°°°°

C (68

°°°°

F) or less]

When engine is hot
[Engine coolant temperature: 80

°°°°

C (176

°°°°

F) or more]

AKX01314

EGR SOLENOID
<3.0L ENGINE>

INTAKE
MANIFOLD

AB

AKX01315

THROTTLE
BODY

EGR VALVE
<3.0L ENGINE>

AB

THROTTLE VALVE NORMAL VACUUM CONDITION

Open quickly

No vacuum (Remained as baro-
metric pressure).

THROTTLE VALVE NORMAL VACUUM CONDITION

Open quickly

Momentarily rises over 13 kPa (3.9
in Hg)

AKX01316 AB

EGR VALVE

TEE-
FITTING

BLACK

<2.4L ENGINE>

AKX01317AB

EGR VALVE

TEE-
FITTING

BLACK

<3.0L ENGINE>

EMISSION CONTROL

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ENGINE AND EMISSION CONTROL

17-92

3. Stop the engine. Remove the Tee-fitting and the hand

vacuum pump.

4. Connect the hand vacuum pump directly to the EGR valve.

5. Start the engine and run at idle until warm.

6. The engine idling speed should be rough when a vacuum of

29 kPa (8.7 in Hg) or more is applied to the EGR valve.

7. If engine idles rough, EGR passage is open and the system

is OK. If engine idle is not rough, the EGR passage and the
valve must be checked for restrictions. Perform the EGR
valve check. Then repeat the EGR system check.

VACUUM CONTROL VALVE CHECK

M1173002700044

1. Disconnect the vacuum hose (white stripe) from the vacuum

control valve and connect the hand vacuum pump to the
vacuum control valve.

2. Plug the end of the removed vacuum hose.

3. Start the engine and run at idle.

4. Check the vacuum condition.

EGR VALVE CHECK

M1173002800041

1. Remove the EGR valve and inspect for sticking, carbon

deposits, etc. If found, clean with a suitable solvent so that
the valve seats correctly.

2. Connect a hand vacuum pump to the EGR valve.

3. Apply 67 kPa (20 in Hg) of vacuum, and check to be sure

that the vacuum is maintained.

4. Apply a vacuum and check the passage of air by blowing

through one side of the EGR passage.

AKX01318

PLUG

EGR VALVE

BLACK

AB

<2.4L ENGINE>

AKX01319 AB

EGR VALVE

BLACK

PLUG

<3.0L ENGINE>

ENGINE CONDITION

NORMAL VACUUM
CONDITION

Idling

Approximately 21.3

−

24.0 kPa

(6.3 - 7.1 in Hg)

AKX01320

WHITE STRIPE

PLUG

AB

VACUUM

PASSAGE OF AIR

5.3 kPa (1.6 in Hg) or less

Air is not blown out

29 kPa (8.7 in Hg) or more

Air is blown out

AKX00348

EMISSION CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-93

NOTE: Passage of air should be checked by blowing the
valve port.

5. Reinstall the EGR valve, using a new gasket, and tighten to

the specified torque.

Tightening torque:

<2.4L engine> 19

±±±±

3 N

⋅⋅⋅⋅

m (14

±±±±

2 ft-lb)

<3.0L engine> 22

±±±±

4 N

⋅⋅⋅⋅

m (16

±±±±

3 ft-lb)

EGR PORT VACUUM CHECK

M1173002900048

1. Disconnect the vacuum hose (green stripe) from the throttle

body EGR vacuum nipple and connect a hand vacuum
pump to the nipple.

2. Start the engine.

3. Measure engine vacuum at idle.

Standard value: 51 kPa (15 in Hg) or more

4. Reset the vacuum pump to "0" (Release vacuum).

5. Using a stop watch, measure how long it takes for the

vacuum gauge to reach 51 kPa (15 in Hg).

Standard value: 1.0 second or less

6. If it takes more than 1.0 second for the gauge to reach 51

kPa (15 in Hg), the EGR may be restricted and should be
cleaned.

EGR SOLENOID CHECK

M1173003100045

1. Disconnect the vacuum hose from the EGR solenoid.

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

2. Disconnect the harness connector.

AKX01322

EGR PORT
VACUUM NIPPLE

<2.4L ENGINE>

AB

AKX01323

EGR PORT
VACUUM NIPPLE

<3.0L ENGINE>

AB

AKX00350

1.0 SECOND

VACUUM

RESET

TIME

AB