Isuzu 1999 RODEO Workshop Manual page 880

DTC P0440 EVAP Control System Malfunction
Step
1 Was the Powertrain On–Board Diagnostic (OBD)
System Check performed?
2 Is Diagnostic Trouble Code P0461, P0462 or P0463
also set?
3 1. Visually/Physically check the fuel cap for missing or
loose conditions.
2. Replace or tighten the fuel cap is necessary.
Was a loose or missing fuel cap found?
4 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 sent solenoid click when
commanded ON and OFF?
5 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.)
6 Has the battery been disconnected?
7 Disconnect the battery, wait 20 seconds then
reconnect the battery.
Is the action complete?
8 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. Attempt to pressurize the EVAP system to the
specified value using the EVAP pressure/purge cart
J41413 (monitor the pressure using the gauges on
the cart with the switch in the HOLD position).
Can the specified value be achieved?
9 1. Maintain the fuel tank pressure at the specified
value?
2. Observe the Fuel Tank Pressure on the Tech 2.
Is the Fuel Tank Pressure at the specified value?
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Action Value(s) Yes
— Go to Step 2
Go to
Applicable
— DTC Chart
Go to Step
— 20
— Go to Step 5
1.51V Go to Step 8
Go to EVAP
Control
System
—
Diagnosis
— Go to Step 5
5 in. H2O Go to Step 9
Go to Step
1.47∼1.51V
12
6E1–253
No
Go to
Powertrain
OBD System
Check
Go to Step 3
Go to Step
4
Go to PCM
Outputs
Diagnosis
Go to Step 6
Go to Step 7
—
Go to Step
10
Go to Step
11