Isuzu 1999 RODEO Workshop Manual page 1565

6E2–322
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0430 –TWC System Low Efficiency Bank 2
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 Are any other DTCs set (such as P0160)?
3 1. Visually and physically inspect the three-way
catalytic converter for damage.
following:
f
dents
f
severe discoloration caused by excessive
temperatures
f
holes
f
internal rattle caused by damaged catalyst
2. Also, ensure that the three-way catalytic converter
is a proper original equipment manufacturer part.
Did your inspection reveal a problem?
4 1. Visually and physically inspect the exhaust system
between the three-way catalytic converter and the
rear converter flange for leaks, damage, and loose
or missing hardware.
2. If a problem is found, repair as necessary.
Did your inspection reveal a problem?
5 1. Visually and physically inspect the Bank 2 HO2S 1.
2. Ensure that the Bank 2 HO2S 2 is secure and that
the pigtail and wiring harness is not contacting the
exhaust pipe or is not otherwise damaged.
3. If a problem is found, repair as necessary.
Did your inspection reveal a problem?
6 Replace the three-way catalytic converter.
NOTE: Check for conditions which may cause catalyst
damage (refer to Diagnostic Aids ).
Is the action complete?
7 1. Review and record the Tech 2 Failure Records data.
2. Clear DTC P0430.
3. Start the engine and allow it to warm up until the
engine coolant temperature monitored on the Tech
2 is above the specified value.
4. Run the engine to maintain the specified mass air
flow range for at least 2 minutes.
5. Operate the vehicle to maintain DTC P0430 test
conditions (refer to DTC Test Description in
Diagnostic Support for detailed instructions).
6. Using a Tech 2, monitor "DTC" info for DTC P0430
until the DTC P0430 test runs.
7. Note the test result.
Does the Tech 2 indicate DTC P0430 passed this
ignition?
Action
Check for the
Value(s) Yes
— Go to Step 2
Diagnose
other DTC(s)
— first
— Go to Step 6
Go to Step 7
to verify
repair
—
Go to Step 7
to verify
repair
—
Go to Step 7
to verify
— repair
Engine
coolant temp:
greater than
60°C
Repair
(140°F).
complete. If
Mass air flow:
a driveability
between 8
symptom still
g/second and
exists, refer
to Symptoms .
50 g/second
No
Go to OBD
System
Check
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6
—
Go to the
Diagnostic
Aids.