Isuzu 1999 RODEO Workshop Manual page 779

6E1–152 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DTC P0133 – O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) (Cont'd)
Step
6 1. Disconnect Bank 1 HO2S 1.
2. Ignition ON.
3. Using a Digital Voltmeter (DVM) at the PCM side of
the HO2S 1 connector, measure the voltage
between the high signal circuit and ground. Also
measure the voltage between the low signal circuit
and ground.
Are both voltages in the specified range?
7 1. With Bank 1 HO2S 1 disconnected, jumper the high
and low (PCM side) signal circuits to ground.
2. Ignition ON.
3. Using a Tech 2, monitor the Bank 1 HO2S 1 voltage.
Does the Tech 2 indicate less than 10 mV and
immediately return to about 450 mV when the jumper is
removed?
8 Replace the affected heated oxygen sensors.
NOTE: Before replacing sensors, the cause of the
contamination must be determined and corrected.
f
Fuel contamination.
f
Use of improper RTV sealant.
f
Engine oil/coolant consumption.
Is the action complete?
9 Repair condition as necessary.
Is the action complete?
10 Check for faulty PCM connections or terminal damage.
Is the action complete?
11 Repair open, short or grounded signal circuit.
Is the action complete?
12 Replace Bank 1 HO2S 1.
Is the action complete?
13 Replace the PCM.
IMPORTANT: The
programmed. Refer to On–Vehicle Service in
Powertrain Control
procedures.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
Action
replacement PCM must
Module and Sensors
Value(s)
3–4 V Go to Step 7
Go to Step 12
—
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
be
for
— Verify repair
Yes No
Go to Step 10
Go to Step 13
—
—
Go to Step 11
—
—
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