Isuzu 1999 RODEO Workshop Manual page 773

6E1–146 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DTC P0131 – O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) (Cont'd)
Step
6 1. Turn the ignition OFF HO2S 1 and PCM
disconnected.
2. Check for continuity between the high and low
signal circuits.
Was there continuity between the high and low circuits?
7 Repair the short between the high and low circuits.
Is the action complete?
8 1. Ignition OFF.
2. Reconnect
disconnected.
3. Ignition ON.
Does the Tech 2 indicate Bank 1 HO2S 1 voltage near
the specified value?
9 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
the PCM, leave the
replacement PCM
Module and Sensors
Value(s)
—
—
sensor
430–450 mV
must be
for
—
Yes No
Go to Step 7 Go to Step 8
Verify repair —
Refer to
Diagnostic
Aids Go to Step 9
Verify repair —