Isuzu 2000 Trooper Workshop Manual page 1087

6E–218
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0158 – HO2S Circuit High Voltage Bank 2 Sensor 2 (Cont'd)
Step
4 1. Ignition "OFF."
2. Disconnect Bank 2 HO2S 2.
3. Ignition "ON."
4. At the HO2S Bank 2 Sensor 2 connector (PCM
side), use a 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.
Is the action complete?
6 1. Ignition "ON," engine "OFF."
2. At Bank 2 HO2S 2 connector (PCM side) jumper
both the HO2S high and low signal circuits (PCM
side) to ground.
3. Using a Tech 2, monitor Bank 2 HO2S 2 voltage.
Is Bank 2 HO2S 2 voltage below the specified value?
7 1. Disconnect the jumpers to ground from Bank 2
HO2S 2 PCM-side connector.
2. With the HO2S 2 connector disconnected, monitor
Bank 2 HO2S 2 voltage.
Is Bank 2 HO2S 2 voltage between the specified
values?
8 Replace the PCM.
IMPORTANT: The
programmed.
Powertrain Control
procedures.
And also refer to the 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
Refer to On-Vehicle Service in
Module and Sensors
Value(s)
3-4 V
—
10 mV
425-475 mV
must be
for
—
Yes No
Go to Step 5 Go to Step 6
Verify repair —
Go to Step 7 Go to Step 8
Refer to
Diagnostic
Aids Go to Step 8
Verify repair —