Dtc P1153 – Ho2S Insufficient Switching Bank 2 Sensor 1 - Isuzu Trooper 1999 Workshop Manual

Diagnostic Aids
A malfunction in the HO2S heater ignition feed or ground
circuit may cause a DTC P1153 to set. Check HO2S
heater circuitry for intermittent faults or poor connections.
If connections and wiring are OK and DTC P1153
continues to set, replace the Bank 2 HO2S 1.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
DTC P1153 – HO2S Insufficient Switching Bank 2 Sensor 1
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 IMPORTANT: If any DTCs are set, (except P1133
and/or P1134), refer to those DTCs before proceeding
with this diagnostic chart.
1. Idle the engine at operating temperature.
2. Operate the vehicle within parameters specified
under "Conditions for Setting the DTC" criteria
included in Diagnostic Support.
3. Using a Tech 2, monitor "DTC" info for DTC P1153
until the DTC P1153 test runs.
Note the test result.
Does Tech 2 indicate DTC failed this ignition?
3 Did the Tech 2 also indicate P1133 and/or P1134 test
failed?
4 Check for leaks at the exhaust pipe joints.
Are the joints leaking?
5 Tighten the U-bolt nuts at the leaking joints.
Is your action complete?
6 Check for gaskets that are damaged or improperly
installed.
Are there damaged or misaligned gaskets?
7 1. Replace the damaged gaskets.
2. Align the connections.
3. Tighten the connections.
Is your action complete?
8 Check for loose exhaust flange connections.
Are the flange connections loose?
9 Tighten the stud nuts or bolts to specifications.
Is your action complete?
10 Check for burned or corroded exhaust pipes.
Are the exhaust pipes burned or corroded?
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Action
3. A condition that affects other heated oxygen sensors
indicates probable contamination. To avoid
damaging replacement sensors, correct the
condition which caused the contamination before
replacing the affected sensors.
5. This step checks for conditions which may cause the
heated oxygen sensor to appear faulty. Correct any
of the described conditions if present.
8. To avoid damaging replacement sensors, correct the
condition which caused the contamination before
replacing the affected sensors.
Value(s)
— Go to Step 2
— Go to Step 3
— Go to Step 20
— Go to Step 5
— Go to Step 2
— Go to Step 7
Go to Step 2
—
— Go to Step 9
— Go to Step 2
— Go to Step 11
6E–401
Yes No
Go to OBD
System
Check
Refer to
Diagnostic
Aids
Go to Step 4
Go to Step 6
—
Go to Step 8
—
Go to Step 10
—
Go to Step 12