Isuzu 1999 RODEO Workshop Manual page 775

6E1–148 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Diagnostic Trouble Code P0132 may be set. Refer to
Fuel System Diagnosis.
f Perform "Injector Balance Test" – Refer to Fuel System
Diagnosis.
f Check the EVAP canister for fuel saturation – If full of
fuel, check canister control and hoses. Refer to
Evaporative (EVAP) Emission Control System.
f Check for a leak in the fuel pressure regulator
diaphragm by checking the vacuum line to the
regulator for the presence of fuel.
f An intermittent TP sensor output will cause the system
to go rich due to a false indication of the engine
accelerating.
f Silicon contamination of the HO2S can also cause a
high HO2S voltage to be indicated. This condition is
indicated by a powdery white deposit on the portion of
the HO2S exposed to the exhaust stream. If
contamination is noticed, replace the affected HO2S.
f Operate the vehicle while monitoring the HO2S voltage
with a Tech 2. If the HO2S voltage is limited within a
DTC P0132 – O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
Step
1 Was the "On–Board Diagnostic (OBD) System Check"
performed?
2 1. Install the Tech 2.
2. Run the engine at operating temperature.
3. Operate the vehicle within parameters specified
under "Conditions for Setting the DTC" included in
Diagnostic Support.
4. Using a Tech 2, monitor Bank 1 HO2S 1 voltage.
Does the Bank 1 HO2S 1 voltage remain above the
specified value?
3 1. Ignition ON review and record Tech 2 Failure
Records data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor "Diagnostic Trouble Code"
info for Diagnostic Trouble Code P0132 until the
Diagnostic Trouble Code P0132 test runs.
4. Note the test result.
Does the Tech 2 indicate Diagnostic Trouble Code
P0132 failed this ignition?
4 1. Ignition OFF.
2. Disconnect Bank 1 HO2S 1.
3. Ignition ON.
4. At HO2S 1 connector (PCM side) use a Digital
Voltmeter (DVM) to measure voltages at the high
and low signal terminals.
Are the voltages in the specified range?
5 Repair short to voltage in signal circuit.
Action
range between 300 mV to 600 mV, check the HO2S
high and low circuit wiring and associated terminal
connections. If the wiring and connections are OK,
replace the HO2S.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart:
3. Diagnostic Trouble Code P0132 failing during
"deceleration fuel cutoff mode" operation may
indicate a condition described in the "Diagnostic
Aids" above. If the Diagnostic Trouble Code P0132
test passes while the Failure Records conditions are
being duplicated, an intermittent condition is
indicated. Reviewing the Failure Records vehicle
mileage since the diagnostic test last failed may
help determine how often the condition that caused
the Diagnostic Trouble Code to be set occurs. This
may assist in diagnosing the condition.
Value(s)
— Go to Step 2
952 mV (500
mV in
deceleration
fuel cutoff
Go to Step 4
mode)
Diagnostic
—
5–14 V Go to Step 5
— Verify repair
Yes No
Go to OBD
System
Check
Go to Step 3
Refer to
Aids Go to Step 4
Go to Step 6
—