Isuzu 1999 RODEO Workshop Manual page 731

6E1–104 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Evaporative (EVAP) Emissions Canister Purge Valve Solenoid Check
Step
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" Hg (34 kPa) of vacuum
available at the EVAP emission canister purge
solenoid?
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?
10 Probe each terminal of the solenoid valve electrical
connector with a test lamp to ground.
Does the test lamp light on both terminals?
11 Repair the short to voltage in the wire between the
solenoid and the PCM.
Is the action complete?
12 Does the ignition feed terminals light the test lamp?
13 Check for an open in the wire between the purge
solenoid and the PCM.
Was there an open circuit?
14 Repair the open in the ignition feed wire.
Is the action complete?
15 Repair the open wire.
Is the action complete?
(Cont'd)
Action Value(s) Yes
No problem
found in the
EVAP
emission
canister
purge valve
—
check.
— Go to Step 7
Go to Step 11
—
— Verify repair
Go to Step 13
—
Go to Step 15
—
— Verify repair
— Verify repair
No
Refer to
Diagnostic
Aids
Go to Step 10
Go to Step 12
—
Go to Step 14
Go to Step 6
—
—