Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1297

6E1–264

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P0440 EVAP Control System Malfunction

  (Cont'd)

Step

No

Yes

Value(s)

Action

16

1. Using the Tech 2, command the EVAP vent solenoid

ON.

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
pressurized position.

3. Using the ultrasonic leak detector J41416, locate

and repair any leaks in the EVAP system (it may be
necessary to partially lower the fuel tank to examine
the top tank connections).

Is the action complete?

—

Go to Step

20 

—

17

Replace the EVAP canister purge valve. Refer to
Diagnostic Aids

Is the action complete?

—

Go to Step

20 

—

18

Locate and repair the cause of no source or vacuum to
the EVAP canister purge valve.

Is the action complete?

—

Go to Step

20 

—

19

Replace the EVAP vent solenoid. Refer to Diagnostic
Aids

Is the action complete?

—

Go to Step

20 

—

20

IMPORTANT: Review the temperature variation
instructions included with J41413 before performing
this step.

1. Turn the ignition switch ON, with the engine OFF.
2. Using the Tech 2, command the EVAP vent solenoid

ON (closed).

3. Pressurize the EVAP system to the specified value

using the EVAP pressure/purge cart J41413
(monitor pressure using the gauge on the cart).

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 2 minutes?

2.14V

System OK

Go to Step  3 

6E1–265

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) P0442 EVAPORATIVE EMISSION (EVAP)

CONTROL SYSTEM SMALL LEAK DETECTED

060R100040

Circuit Description

The evaporative system includes the following
components:

D

Fuel tank.

D

EVAP vent solenoid.

D

Fuel tank pressure sensor.

D

Fuel pipes and hoses.

D

Fuel vapor lines.

D

Fuel cap.

D

EVAP canister.

D

Purge lines.

D

EVAP canister purge valve.

D

EVAP service port.

The evaporative emission system is checked by applying
vacuum to the EVAP system and monitoring for a vacuum
decay. The PCM monitors the vacuum level through the
fuel tank pressure sensor signal.  At an appropriate time,
the EVAP canister purge valve and the EVAP vent
solenoid are turned ON, allowing the engine to draw a
small vacuum on the entire evaporative emission system.
After the desired vacuum level has been achieved, the
EVAP canister purge valve is turned OFF, sealing the
system.  A leak is detected by monitoring for a decrease in
vacuum level over a given time period, when all other
variables remain constant. A small leak in the system will
cause Diagnostic Trouble Code P0442 to be set.  DTC
P0442 is a type A code.

Conditions for Setting the DTC

D

The BARO is greater than 72.3 kPa.

D

No: MAP, TPS, IAT, ECT, EGR, EVAP Purge Solenoid,
EVAP Vent Solenoid, VSS, or System Voltage
Diagnostic Trouble Codes.

D

IAT and ECT at startup are between 4.2

°

C(40

°

F) and

35

°

C (95

°

F).

D

The difference between IAT and ECT at startup is less
than 6.75

°

C (12.2

°

F).

D

Fuel Level counts vary by less than 8 counts in a 0.125
second time frame.

D

The Fuel Tank Level Sensor reads between 15% and
85%.

D

Maximum Engine Run time is at least 390 seconds.

D

The difference between the actual Fuel Tank Pressure
and the expected Fuel Tank Pressure is less than the
PCM’s expectation.

D

Fuel Tank Pressure slope is less than or equal to
2.4mm (0.098 inches)of water, per seconds.

The above conditions are met, and the following condition
is met once per ignition cycle:

D

A single 10 second vacuum decay slope and 2 five
second vacuum slopes are all greater than or equal to
the PCM’s upper threshold.

6E1–266

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Action Taken When the DTC Sets

D

The Malfunction Indicator Lamp (MIL) will illuminate.

D

The PCM will record operating conditions at the time
the diagnostic fails.  The Freeze Frame and Failure
Records buffers will store this information.

D

A history Diagnostic Trouble Code is stored.

Conditions for Clearing the MIL/DTC

D

The MIL will turn OFF after 3 consecutive ignition
cycles in which the diagnostic runs without a fault.

D

A history Diagnostic Trouble Code will clear after 40
consecutive warm up cycles without a fault.

D

A Tech 2 can clear the Diagnostic Trouble Codes.

Diagnostic Aids

D

A loose, missing, or damaged fuel cap.

D

Missing or damaged O–rings at the fuel vapor fittings
and the EVAP purge line canister fittings.

D

Cracked EVAP canister.

D

Damaged source vacuum line, EVAP purge line, EVAP
vent hose or fuel vapor line.

D

The Fuel Pressure Sensor shares a 5 Volt reference
with the MAP sensor.
If these codes are also set, it could indicate a
problem with the 5 Volt reference circuit or
components itself.

D

The Fuel Pressure Sensor share a ground with the
ECT sensor, the TP sensor the CMP, the CKP and
Automatic transmission temperature sensor.

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 to the
EVAP vent solenoid, the EVAP purge solenoid, and the
fuel tank pressure sensor for an intermittent open or
intermittent short circuit.

Check for charcoal particles.  Refer to Carbon Particle
Removal from EVAP System before starting repairs.
Reviewing the Fail Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that causes the Diagnostic Trouble Code to
set occurs. This may assist in diagnosing the condition.

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart:
1. The Powertrain OBD System Check prompts the

technician to complete some basic checks and store
the freeze frame and failure records data on the
Tech 2 if applicable.  This creates an electronic copy
of the data taken when the malfunction occurred.
The information is then stored on the Tech 2 for
later reference.

3. If a vent solenoid or EVAP canister purge valve

electrical malfunction is present, the purge system
will not operate correctly.  Repairing the electrical
malfunction will very likely correct the condition that
set Diagnostic Trouble Code P0442.

4. Checks the fuel tank pressure sensor at ambient

pressure.

6. Forces the fuel tank pressure sensor to re–zero.

7. Verifies that the fuel tank pressure sensor

accurately reacts to EVAP system pressure
changes.

DTC P0442 EVAP Control System Small Leak Detected

 

Step

Action

Value(s)

Yes

No

1

Was the ”On–Board Diagnostic (OBD) System Check”
performed?

—

Go to Step  2 

Go to

Powertrain

OBD System

Check 

2

Is Diagnostic Trouble Code P0461, P0462, or P0463
also set?

—

Go to

Applicable

DTC Table

Go to Step  3 

3

1. Install a Tech 2.
2. Command the EVAP canister purge valve and vent

solenoid ON and OFF with the Tech 2?

Does the purge valve and vent solenoid click ON and
OFF?

—

Go to Step  4 

Go to PCM

Outputs

Diagnosis

4

1. Turn the ignition switch OFF.
2. Remove the fuel cap.
3. Turn the ignition switch ON.

Is the Fuel Tank Pressure at the specified value? (if no,
start with the diagnosis chart for other sensors in the
circuit and see if 5V returns.)

1.51V

Go to Step  7 

Go to Step  5 

6E1–267

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P0442 EVAP Control System Small Leak Detected

  (Cont'd)

Step

No

Yes

Value(s)

Action

5

Has the battery been disconnected?

—

Go to EVAP

Control

System

Diagnosis 

Go to Step  6 

6

Disconnect the battery, wait 20 seconds then
reconnect the battery.

Is the action complete?

—

Go to Step  4 

—

7

IMPORTANT: Before continuing with this diagnosis,
zero the EVAP Pressure and Vacuum Gauges on the
EVAP pressure/purge cart J41413. Also read the
temperature variation instruction card. (Refer to tool
operating instructions).

1. Reinstall the fuel cap.
2. Using the Tech 2, command the EVAP vent solenoid

ON (closed).

3. Connect the EVAP pressure/purge cart J41413 to

the EVAP service port.

4. Pressurize the EVAP system to the specified value

using the EVAP pressure/purge cart J41413
(monitor the pressure using the gauge on the cart
with the switch in the HOLD position.

5. Observe the Fuel Tank Pressure on the Tech 2.

Is the Fuel Tank Pressure at the specified value?

5 in. H2O (

±

2

in. H2O)

Go to Step  8 

Go to EVAP

Control

System

Diagnosis 

8

IMPORTANT: Review the temperature variation
instructions included with the J41413 before
performing this step.

1. Turn the ignition switch ON, with the engine OFF.
2. Using the Tech 2, command the EVAP vent solenoid

ON (closed).

3. Pressurize the EVAP system to the specified value

using the EVAP pressure/purge cart J41413
(monitor the pressure using the gauge on the cart).

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 2 minutes?

1.47 – 1.51V

Go to Step  9 

Refer to

Diagnostic

Aids 

9

1. Disconnect the fuel tank vapor line and the EVAP

purge line from the EVAP canister.

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

line fitting on the canister.

4. Ensure that the EVAP vent solenoid is still

commanded ON (closed).

5. Attempt to apply vacuum to the canister.

Can the specified vacuum be maintained?

5 in. Hg

Go to Step

12 

Go to Step

10 

10

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 repair necessary?

—

Go to Step

14 

Go to Step

11