Isuzu Rodeo UE. Service manual — part 422
6E2–443
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Bank 1 Restricted Exhaust System Check (Manual Transmission)
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performs?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Remove the Bank 1 HO2S 3.
2. Install the Exhaust Backpressure Tester
(BT-8515-V or equivalent) in place of the Bank 1
HO2S 3.
3. Run the engine at normal operating temperature.
4. Increase the engine speed to 2000 RPM and allow
10 seconds for pressure to build.
5. Observe the exhaust system backpressure reading
on the gauge.
Does the reading exceed the amount in the value
column?
8.62 kPa
(1.25 psi)
Go to
Step 3
Go to
Step 4
3
Repair the restriction in the exhaust system after the
catalytic converter.
Possible faults include:
f
Collapsed pipe
f
Heat distress
f
Internal muffler failure
Is the action complete?
—
Verify repair
—
4
1. Install the Bank 1 HO2S 3.
2. Install the Exhaust Backpressure Tester in place of
Bank 1 HO2S 2.
3. Run the engine at normal operating temperature.
4. Increase the engine speed to 2000 RPM and allow
10 seconds for pressure to build.
5. Observe the exhaust system backpressure reading
on the gauge.
Does the reading exceed the amount in the value
column?
8.62 kPa
(1.25 psi)
Go to
Step 5
No trouble
found. If a
driveability
symptom
exists, refer
to symptom
charts
5
Repair the restriction in the catalytic converter.
Is the action complete?
—
Verify repair
—
NOTE: DTCs will be set by running the vehicle to normal
operating temperature after a cold start with the O2
sensor disconnected. After performing these tests, use
the Tech 2 to erase the DTCs that were set by the lack of
O2 sensor activity.
6E2–444
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Bank 1 Restricted Exhaust System Check (Automatic Transmission)
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performs?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Remove the Bank 1 HO2S 2.
f
Refer to
On-Vehicle Service, Heated Oxygen
Sensors for removal procedures.
2. Install the Exhaust Backpressure Tester
(BT-8515-V or equivalent) in place of the Bank 1
HO2S 2.
3. Run the engine at normal operating temperature.
4. Increase the engine speed to 2000 RPM and allow
10 seconds for pressure to build.
5. Observe the exhaust system backpressure reading
on the gauge.
Does the reading exceed the amount in the value
column?
8.62 kPa
(1.25 psi)
Go to
Step 3
Go to
Step 4
3
Repair the restriction in the exhaust system after the
catalytic converter.
Possible faults include:
f
Collapsed pipe
f
Heat distress
f
Internal muffler failure
Is the action complete?
—
Verify repair
—
4
1. Install the Bank 1 HO2S 2.
f
Refer to
On-Vehicle, Heated Oxygen Sensors
for installation procedures.
2. Install the Exhaust Backpressure Tester in place of
Bank 1 HO2S 1.
3. Run the engine at normal operating temperature.
4. Increase the engine speed to 2000 RPM and allow
10 seconds for pressure to build.
5. Observe the exhaust system backpressure reading
on the gauge.
Does the reading exceed the amount in the value
column?
8.62 kPa
(1.25 psi)
Go to
Step 5
No trouble
found. If a
driveability
symptom
exists, refer
to
Section
B-1 symptom
charts
5
Repair the restriction in the catalytic converter.
Is the action complete?
—
Verify repair
—
NOTE: DTCs will be set by running the vehicle to normal
operating temperature after a cold start with the O2
sensor disconnected. After performing these tests, use
the Tech 2 to erase the DTCs that were set by the lack of
O2 sensor activity.
6E2–445
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Bank 2 Restricted Exhaust System Check (Automatic Transmission)
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performs?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Remove the Bank 2 HO2S 2.
f
Refer to
On-Vehicle Service, Heated Oxygen
Sensors for removal procedures.
2. Install the Exhaust Backpressure Tester
(BT-8515-V or equivalent) in place of the Bank 2
HO2S 2.
3. Run the engine at normal operating temperature.
4. Increase the engine speed to 2000 RPM and allow
10 seconds for pressure to build.
5. Observe the exhaust system backpressure reading
on the gauge.
Does the reading exceed the amount in the value
column?
8.62 kPa
(1.25 psi)
Go to
Step 3
Go to
Step 4
3
Repair the restriction in the exhaust system after the
catalytic converter.
Possible faults include:
f
Collapsed pipe
f
Heat distress
f
Internal muffler failure
Is the action complete?
—
Verify repair
—
4
1. Install the Bank 2 HO2S 2.
f
Refer to
On-Vehicle Service, Heated Oxygen
Sensors for installation procedures.
2. Install the Exhaust Backpressure Tester in place of
Bank 1 HO2S 1.
3. Run the engine at normal operating temperature.
4. Increase the engine speed to 2000 RPM and allow
10 seconds for pressure to build.
5. Observe the exhaust system backpressure reading
on the gauge.
Does the reading exceed the amount in the value
column?
8.62 kPa
(1.25 psi)
Go to
Step 5
No trouble
found. If a
driveability
symptom
exists, refer
to
Section
B-1 symptom
charts
5
Repair the restriction in the catalytic converter.
Is the action complete?
—
Verify repair
—
NOTE: DTCs will be set by running the vehicle to normal
operating temperature after a cold start with the O2
sensor disconnected. After performing these tests, use
the Tech 2 to erase the DTCs that were set by the lack of
O2 sensor activity.
6E2–446
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Default Matrix Table
Service Procedure Default Strategy
A referral strategy has been established to assist the
technician with additional information when the cause of
the failure cannot be determined. If no problem is found
after performing diagnostics, then refer to the default
matrix table for further diagnostic information.
Default Matrix Table
Strategy Based Diagnostic Charts
Initial Diagnosis
Default Section(s)
On-Board Diagnostic (OBD) System
Check
Vehicle does not enter diagnostics.
Chassis Electrical
On-Board Diagnostic (OBD) System
Check
Vehicle enters diagnostics and
communicates with the Tech 2. MIL is
“ON” in diagnostics. Engine does not
start and run.
Ignition System Check
On-Board Diagnostic (OBD) System
Check
Engine starts and runs, no PCM codes
set. Customer complains of vibration.
—
On-Board Diagnostic (OBD) System
Check
Engine starts and runs, no PCM codes
set. Customer complains of harsh or
soft shift, poor performance, delayed or
no engagement into drive or reverse,
transmission fluid leak, transmission
noise or vibration, or improper TCC
operation.
Automatic Transmission
PCM Power and Ground Check
On-Board Diagnostic (OBD) System
Check.
Chassis Electrical
PCM Power and Ground Check
On-Board Diagnostic (OBD) System
Check. PCM power and ground circuits
OK. Data link voltage incorrect.
Chassis Electrical
On-Board Diagnostic (OBD) System
Check
Engine starts and runs, no PCM codes
set. Customer complains of harsh or
soft shift, poor performance, delayed or
no engagement into drive or reverse,
transmission fluid leak, transmission
noise or vibration, or improper TCC
operation.
Automatic Transmission
Symptoms
Initial Diagnosis
Default Section(s)
Intermittents
1. On-board diagnostic (OBD)
system check.
2. Careful visual/physical inspections.
Chassis Electrical
Hard Starts
1. OBD system check.
2. Sensors (ECT, MAP, MAF, TP) ;
MAP output chart.
3. Fuel system electrical test, fuel
system diagnosis.
4. Ignition system.
5. IAC system check.
Engine Mechanical, Ignition
System Check, Exhaust System
Diagnosis
Surges and/or Chuggles
1. OBD system check.
2. Heated oxygen sensors.
3. Fuel system diagnosis.
4. Ignition system.
Calibration ID “Broadcast”
/Service Bulletins, Ignition
System Check, Generator
Output, Exhaust System
Diagnosis, 4L30-E System Test
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