Isuzu Rodeo UE. Manual - part 182

6E1–99

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Exhaust Gas Recirculation (EGR) System Check

 

Step

Action

Value(s)

Yes

No

1

Check the EGR valve for looseness.

Is the EGR valve loose?

—

Go to Step 2 

Go to Step 3 

2

Tighten the EGR valve.

Is the action complete?

—

Verify repair

—

3

1. Place the transmission selector in Park or Neutral.
2. Start the engine and idle until warm (”Closed Loop”).
3. Using a Tech 2, command EGR ”50% ON.”

Does the engine idle rough and lose RPMs?

—

EGR system

working

properly. No

problem

found.

Go to Step 4 

4

1. Engine OFF.
2. Ignition ON.
3. Using a test light to ground, check the EGR harness

between the ignition feed and ground.

Does the test light illuminate?

—

Go to Step 6 

Go to Step 5 

5

Repair the EGR harness ignition feed.

Was the problem corrected?

—

Verify repair

Go to Step 6 

6

1. Remove the EGR valve.
2. Visually and physically inspect the EGR valve

pintle, valve passages and adapter for excessive
deposits, obstructions or any restrictions.

Does the EGR valve have excessive deposits,
obstructions or any restrictions?

—

Go to Step 7 

Go to Step 8 

7

Clean or replace EGR system components as
necessary.

Was the problem corrected?

—

Verify repair

Go to Step 8 

8

1. Ground the EGR valve metal case to battery (–).
2. Using a Tech 2, command EGR ON and observe the

EGR valve pintle for movement.

Does the EGR valve pintle move according to
command?

—

Go to Step 9 

Go to DTC

P0404 chart 

9

1. Remove the EGR inlet and outlet pipes from the

intake and exhaust manifolds.

2. Visually and physically inspect manifold EGR ports

and EGR inlet and outlet pipes for blockage or
restriction caused by excessive deposits or other
damage.

Do the manifold EGR ports or inlet and outlet pipes
have excessive deposits, obstructions, or any
restrictions?

—

Go to Step 10

EGR system

working

properly. No

problem

found.

10

Clean or replace EGR system components as
necessary.

Is the action complete?

—

Verify repair

—

6E1–100

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

MANIFOLD ABSOLUTE PRESSURE (MAP) OUTPUT CHECK

D06RX042

Circuit Description

The manifold absolute pressure (MAP) sensor measures
the changes in the intake MAP which result from engine
load (intake manifold vacuum) and engine speed
changes; and converts these into a voltage output. The
powertrain control module (PCM) sends a 5–volt
reference voltage to the MAP sensor. As the MAP
changes, the output voltage of the sensor also changes.
By monitoring the sensor output voltage, the PCM knows
the MAP. A lower pressure (low voltage) output voltage
will be about 1–2 volts at idle. Higher pressure (high
voltage) output voltage will be about 4–4.8 volts at wide
open throttle. The MAP sensor is also used, under certain
conditions, to measure barometric pressure, allowing the
PCM to make adjustments for different altitudes. The
PCM uses the MAP sensor to diagnose proper operation
of the EGR system, in addition to other functions.

Test Description

IMPORTANT:

Be sure to use the same diagnostic test

equipment for all measurements.
The number(s) below refer to the step number(s) on the
Diagnostic Chart:

1. When you compare the Tech 2 readings to a known

good vehicle, it is important to compare vehicles
that use MAP sensors that have the same part
number.

2. Applying 34 kPa (10 Hg) vacuum to the MAP sensor

should cause the voltage to be 1.5–2.1 volts less
than the voltage at step 1. Upon applying vacuum to
the sensor, the change in voltage should be
instantaneous. A slow voltage change indicates a
faulty sensor.

3. Check the vacuum hose to the sensor for leaking or

restriction. Be sure that no other vacuum devices
are connected to the MAP hose.

IMPORTANT:

Make sure the electrical connector

remains securely fastened.

4. Disconnect the sensor from the bracket. Twist the

sensor with your hand to check for an intermittent
connection. Output changes greater than 0.10 volt
indicate a bad sensor.

6E1–101

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Manifold Absolute Pressure (MAP) Output Check

 

Step

Action

Value(s)

Yes

No

1

1. Turn the ignition OFF and leave it OFF for 15

seconds.

2. Ignition ON. Do not crank engine.
3. The Tech 2 should indicate a manifold absolute

pressure (MAP) sensor voltage.

4. Compare this scan reading to the scan reading of a

known good vehicle obtained using the exact same
procedure as in Steps 1–4.

Is the voltage reading the same +/– 0.40 volt?

—

Go to Step 2 

Go to Step 5 

2

1. Disconnect the vacuum hose at the MAP sensor

and plug the hose.

2. Connect a hand vacuum pump to the MAP sensor.
3. Start the engine.
4. Apply 34 kPa (10 Hg) of vacuum and note the

voltage change.

Is the voltage change 1.5–2.1 volts less than step 1?

—

Go to Step 3 

Go to Step 4 

3

Check the sensor hose for leakage or restriction.

Does the hose supply vacuum to the MAP sensor only?

—

Go to Step 5 

Go to Step 4 

4

Repair the hose to ensure the hose supplies vacuum to
the MAP sensor only.

Is the action complete?

—

Verify repair

—

5

Check the sensor connection.

Is the sensor connection good?

—

Go to Step 6 

Go to Step 7 

6

Refer to On–Vehicle Service, MAP Sensor.

Is the action complete?

—

Verify repair

—

7

Repair the poor connection.

Is the action complete?

—

Verify repair

—

6E1–102

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

EVAPORATIVE (EVAP) EMISSIONS CANISTER PURGE VALVE SOLENOID

CHECK

D06RX056

Circuit Description

Canister purge is controlled by a solenoid valve that
allows manifold vacuum to purge the canister. The
powertrain control module (PCM) supplies a ground to
energize the solenoid valve (purge ON). The EVAP purge
solenoid control is turned ON time is determined by
engine operating conditions including load, throttle
position, coolant temperature and ambient temperature.
The duty cycle is calculated by the PCM and the purge
solenoid is enabled when the appropriate conditions have
been met:

f

The engine run time after start is more than 60
seconds.

f

The engine coolant temperature is above 30

°

C

(86

°

F).

f

The fuel control system is operating in the
Closed–Loop mode.

Diagnostic Aids

f

Make a visual check of vacuum hoses.

f

Check the throttle body for possible cracked.

f

Check the malfunction indicator lamp for a possible
mechanical problem.

Test Description

The number(s) below refer to the step number(s) on the
Diagnostic Chart:
1. Check to see if the solenoid is open or closed. The

solenoid is normally de–energized in this step, so it
should be closed.

2. This step checks to determine if the solenoid was

open due to an electrical circuit problem or a
defective solenoid.

3. This should normally energize the solenoid, opening

the valve and allowing the vacuum to drop (purge
ON).