Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1258

6E1–108

RODEO Y22SE 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 inch 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

—

6E1–109

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

EVAPORATIVE (EVAP) EMISSIONS CANISTER PURGE VALVE SOLENOID

CHECK

060R100040

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:

D

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

D

The engine coolant temperature is above 30

°

C

(86

°

F).

D

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

Diagnostic Aids

D

Make a visual check of vacuum hoses.

D

Check the throttle body for possible cracked.

D

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).

6E1–110

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Evaporative (EVAP) Emissions Canister Purge Valve Solenoid Check

 

Step

Action

Value(s)

Yes

No

1

1. Ignition OFF.
2. Ignition ON, engine OFF.
3. At the throttle body, disconnect the hose that goes

to the pump solenoid.

4. Using a hand vacuum pump with an attached

vacuum gauge J 23738–A, apply vacuum (10 inch
Hg or 34 kPa) to the solenoid.

Does the solenoid hold vacuum?

—

Go to Step 3 

Go to Step 2 

2

1. Disconnect the solenoid electrical connector.
2. As in Step 1, apply vacuum (10” Hg or 34 kPa) to the

solenoid.

Does the solenoid hold vacuum?

—

Go to Step 4 

Go to Step 7 

3

1. At the throttle body, put a cap over the vacuum port

where the hose was disconnected for testing. This
is to prevent a vacuum leak when the engine is
started.

2. Ignition OFF.
3. Install the Tech 2.
4. Apply vacuum to the purge solenoid with the hand

vacuum pump.

5. Start the engine, run at 2500 RPM.
6. Using the Tech 2 command the purge solenoid ON.

Did the vacuum drop when the purge was turned on?

—

Go to Step 8 

Go to Step 9 

4

Check for a short to ground or open in the wire between
the solenoid and the PCM.

Is there a problem?

—

Go to Step 5 

Go to Step 6 

5

Repair the faulty wire.

Is the action complete?

—

Verify repair

—

6

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed. Refer to On–Vehicle Service in
Powertrain Control Module and Sensors for
procedures. 

and also refer to latest service bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.

Is the action complete?

—

Verify repair

—

7

Replace the faulty purge solenoid.
Refer to On–Vehicle Service, EVAP Canister Purge
Solenoid.

Is the action complete?

—

Verify repair

—

6E1–111

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Evaporative (EVAP) Emissions Canister Purge Valve Solenoid Check

  (Cont'd)

Step

No

Yes

Value(s)

Action

8

1. Turn the ignition OFF.
2. At the throttle body, install a vacuum gauge where

the hose from the purge solenoid was disconnected
for testing.

3. Start the engine.
4. Stabilize the engine speed at about 2500 RPM.
5. Momentarily snap the throttle open and let it return

to idle.

Is there approximately 10 inch Hg (34 kPa) of vacuum
available at the EVAP emission canister purge
solenoid?

—

No problem

found in the

EVAP

emission

canister

purge valve

check.

Refer to

Diagnostic

Aids 

9

1. Turn the Ignition OFF.
2. Disconnect the solenoid’s electrical connector.
3. Connect a test lamp between the harness

terminals.

4. Turn the Ignition ON.

Does the test lamp light?

—

Go to Step 7 

Go to Step 10

10

Probe each terminal of the solenoid valve electrical
connector with a test lamp to ground.

Does the test lamp light on both terminals?

—

Go to Step 11

Go to Step 12

11

Repair the short to voltage in the wire between the
solenoid and the PCM.

Is the action complete?

—

Verify repair

—

12

Does the ignition feed terminals light the test lamp?

—

Go to Step 13

Go to Step 14

13

Check for an open in the wire between the purge
solenoid and the PCM.

Was there an open circuit?

—

Go to Step 15

Go to Step 6 

14

Repair the open in the ignition feed wire.

Is the action complete?

—

Verify repair

—

15

Repair the open  wire.

Is the action complete?

—

Verify repair

—