Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service 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
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