Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1468

6E2–323

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

DTC P0442 – EVAP System Leak Detected

  (Cont'd)

Step

No

Yes

Value(s)

Action

5

1. Disconnect the fuel tank vapor line and the EVAP

purge line from the EVAP canister.

2. Block the canister fitting for the fuel tank vapor line.
3. Connect a hand vacuum pump to the canister fitting

for the EVAP purge line.

4. Ensure that the EVAP canister vent solenoid is still

commanded “ON” (closed).

5. Attempt to apply vacuum to the EVAP canister.

Can the vacuum be maintained at the specific value?

1.46V

Go to 

Step 8

Go to 

Step 6

6

1. Visually/physically check for the following

conditions:

D

Vent hose disconnected or damaged.

D

EVAP canister damaged.

2. If a problem is found, repair as necessary. 

Was a problem found?

—

Go to 

Step 10

Go to 

Step 7

7

Replace the EVAP canister vent solenoid.

Is the action complete?

—

Go to 

Step 10

—

8

1. Visually/physically check for the following

conditions:

D

Missing or faulty fuel cap.

D

Disconnected or leaking fuel tank vapor line.

D

Disconnected or damaged EVAP purge line.

2. If a problem is found, repair as necessary. 

Was a problem found?

—

Go to 

Step 10

Go to 

Step 9

9

1. Using Tech 2, command the EVAP canister vent

solenoid “ON” (closed).

2. With the cart connected to the EVAP service port,

continuously attempt to pressurize the EVAP
system by leaving the cart control knob in the
pressurize position.

3. Using ultrasonic leak detector J 41416, locate and

repair leak in EVAP system. (It may be necessary to
partially lower the fuel tank to examine the
connections on top of the tank.)

Is the action complete?

—

Go to 

Step 10

—

10

1. Ignition “ON”, engine not running.
2. Using the Tech 2, command the EVAP canister vent

solenoid “ON” (closed).

3. Using the EVAP pressure/purge cart J 41413,

pressurize and monitor the EVAP system to 15 in.
H

2

O.

4. Switch the rotary switch on the cart to “HOLD” and

observe the EVAP pressure gauge.

Does the pressure decrease to less than the specified
value within 30 seconds?

2.14V

Go to 

Step 2

Verify repair

6E2–324

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0444 EVAP Purge Control Circuit Open

060RY00398

Circuit Description

The canister purge solenoid valve is controlled by the
Power Train Control Module (PCM).The PCM monitors
vacuum level via the fuel tank pressure sensor input.
At an appropriate time, the EVAP canister purge solenoid
is “ON,” allowing engine vacuum to draw a small vacuum
on the entire evaporative emissions system.

Conditions for setting the DTC

D

The Ignition is “ON”.

D

Engine is running.

D

System voltage is between 11.5 volts and 16 volts.

Action Taken When the DTC Sets

D

The PCM will not illuminate the malfunction indicator
lamp (MIL).

D

The PCM will store conditions which were present
when the DTC was set in the Failure Records data only.

Conditions for Clearing the MIL/DTC

D

The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

D

A history DTC P0444 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

D

DTC P0444 can be cleared using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.

Diagnostic Aids

An intermittent may be caused by the following:

D

Poor connections.

D

Mis routed harness.

D

Rubbed through wire insulation.

D

Broken wire inside the insulation.

Check for the following conditions:

D

Poor connection at PCM-Inspect harness connectors
for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.

D

Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
EVAP purge solenoid display on the Tech 2 while
moving connectors and wiring harnesses related to the
sensor.
A change in the display will indicate the location of
the fault. If DTC P0444 cannot be duplicated, the
information included in the Failure Records data can
be useful in determined vehicle mileage since the
DTC was last set.

If it is determined that the DTC occurs intermittently,
performing the DTC P0444 Diagnostic Chart may
isolate the cause of the fault.

6E2–325

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

DTC P0444  EVAP Purge Control  Circuit Open

 

Step

Action

Value(s)

Yes

No

1

Was the “On-Board (OBD) System Check” performed?

—

Go to 

Step 2

Go to 

OBD

System

Check

2

1. Install the Tech 2.
2. Ignition is “ON”,
3. Engine is “ON” and operate the accelerator pedal

for 3 or 4 times.

4. Observe the EVAP purge solenoid reading on the

Tech 2.

Is the EVAP purge solenoid reading near the specified
value?

More than 1%

Refer to

Diagnostic

Aids

Go to 

Step 3

3

Check the power supply circuit.

1. Ignition is “OFF”.
2. Disconnect the canister purge solenoid valve.
3. Ignition is “ON”.
4. Using a DVM, measure at the EVAP purge solenoid

connector between ground and voltage supply.

Was the measurement near the specified value?

Battery

voltage

Go to 

Step 4

Go to 

Step 5

4

Check the signal circuit for the EVAP purge solenoid.

1. Ignition is “OFF”.
2. Disconnect the canister purge solenoid valve.
3. Disconnect the PCM.
4. Check the circuit between EVAP purge solenoid

connector and PCM connector.

Is the problem found?

—

Go to 

Step 5

Go to 

Step 6

5

Repair the circuit as necessary.

Is the action complete?

—

Verify repair

—

6

Check the canister purge solenoid valve. Using a DVM,
measure resistance for purge solenoid valve connector
terminal.

Is the purge solenoid valve resistance within the
specified values?

25–30 

W

 (at

68

°

F{20

°

C})

Go to 

Step 8

Go to 

Step 7

7

Replace the canister purge solenoid valve.

Is the action complete?

—

Verify repair

—

8

Replace the

IMPORTANT: The replacement PCM must be
programmed. 

Refer to 

ON-Vehicle Service in Power 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

—

6E2–326

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0445 EVAP Purge Control Circuit Short

060RY00398

Circuit Description

The canister purge solenoid valve is controlled by the
Power Train Control Module (PCM). The PCM monitors
vacuum level via the fuel tank pressure sensor input.
At an appropriate time, the EVAP canister purge solenoid
is “ON,” allowing engine vacuum to draw a small vacuum
on the entire evaporative emissions system.

Conditions for setting the DTC

D

The Ignition is “ON”.

D

Engine is running.

D

System voltage is between 11.5 volts and 16 volts.

Action Taken When the DTC Sets

D

The PCM will not illuminate the malfunction indicator
lamp (MIL).

D

The PCM will store conditions which were present
when the DTC was set in the Failure Records data only.

Conditions for Clearing the MIL/DTC

D

The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

D

A history DTC P0445 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

D

DTC P0445 can be cleared using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.

Diagnostic Aids

An intermittent may be caused by the following:

D

Poor connections.

D

Misrouted harness.

D

Rubbed through wire insulation.

D

Broken wire inside the insulation.

Check for the following conditions:

D

Poor connection at PCM-Inspect harness connectors
for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.

D

Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
EVAP purge solenoid display on the Tech 2 while
moving connectors and wiring harnesses related to the
sensor.
A change in the display will indicate the location of
the fault. If DTC P0445 cannot be duplicated, the
information included in the Failure Records data can
be useful in determined vehicle mileage since the
DTC was last set.

If it is determined that the DTC occurs intermittently,
performing the DTC P0445 Diagnostic Chart may
isolate the cause of the fault.