Isuzu Rodeo UE. 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