Isuzu 1999 RODEO Workshop Manual page 1439

6E2–196
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Aids
Check for the following conditions:
f Poor connection at PCM – Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.
f Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
Bank 2 HO2S 1 display on the Tech 2 while moving
connectors and wiring harnesses related to the sensor.
A change in the display will indicate the location of the
fault.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
DTC P0153 – HO2S Slow Response Bank 2 Sensor 1
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 NOTE: If any DTCs are set, (except P0133, P1133,
P1134, P1153, and/or P1154), refer to those DTCs
before proceeding with this diagnostic chart.
1. Install the Tech 2.
2. Idle the engine at operating temperature.
3. Operate the vehicle within parameters specified
under "Conditions for Setting the DTC" criteria
included in Diagnostic Support.
4. Using a Tech 2, monitor "DTC" info for DTC P0153
until the DTC P0153 test runs.
5. Note the test result.
Does the Tech 2 indicate DTC P0153 failed this
ignition?
3 Did the Tech 2 also indicate DTC P0153, P1133,
P1134, P1153, and/or P1154 test failed this ignition?
4 Check for leaks at the pipe joints.
Are the joints leaking?
5 Tighten the U-bolt nuts at the leaking joint.
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?
Action
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.
2. Verifies that the fault is currently present.
3. HO2S transition time, ratio mean volts and switching
DTCs set for multiple sensors indicate probable
contamination. Before replacing the sensors,
isolate and correct the source of the contamination
to avoid damaging the replacement sensors.
Value(s)
— Go to Step 2
— Go to Step 3
— Go to Step 17
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
—
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