Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 252

ENGINE DRIVEABILITY AND EMISSIONS

6E–249

Monitor “B1S1 (Bank 1 Sensor 1) Status” on the Tech
2.
Is the “B1S1 (Bank 1 Sensor 1) Status” in the rich
condition?

—

Verify repair

Go to Step 15

Check items that can cause the engine to run rich.
Refer to DTC P1167 “Fuel Supply System Rich During
Deceleration Fuel Cut Off”.
Was a problem found?

—

Verify repair

Go to Step 16

1. Remove the spark plugs and check for gas or oil

fouling cracks, wear, improper gap, burned
electrodes, heavy deposits, or improper heat
range.

2. If spark plugs are fouled, the cause of fouling must

be determined before replacing the spark plugs.

Was a problem found?

—

Verify repair

Go to Step 17

Check for proper calibration of the speedometer.
Does the speed indicated on the speed meter closely
match the vehicle speed displayed on the Tech 2?

—

Go to Step 19

Go to Step 18

17B

Check the vehicle speed on accurate chassisi dynamo
on check number of pulse fun speed sensor. See
typical data below.

Diagnose and repair the inaccurate speedometer
condition as necessary. Refer to Vehicle Speed
Sensor in Electrical Diagnosis.

—

Verify Repair

—

Check for proper calibration of the fuel gauge.
Was a problem found?

—

Verify repair

Go to Step 20

Check for the following engine mechanical problems
(refer to Engine Mechanical):

• Low compression

• Worn camshaft

• Sticking or leaking valves

• Valve timing
Was a problem found?

—

Verify repair

Go to Step 21

1. Review all diagnostic procedures within this table.

2. If all procedures have been completed and no

malfunctions have been found, review/inspect the
following:

• Visual/physical inspection

• Tech 2 data

• All electrical connections within a suspected

circuit and/or system

Was a problem found?

—

Verify repair

Go to Step 22

Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?

—

Verify repair

Go to Step 23

Step

Action

Value(s)

Yes

6E–250

ENGINE DRIVEABILITY AND EMISSIONS

Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobiliser System-ECM replacement” for
the ECM/Immobiliser linking procedure.

—

Verify Repair

—

Step

Action

Value(s)

Yes

ENGINE DRIVEABILITY AND EMISSIONS

6E–251

EXCESSIVE EXHAUST EMISSIONS OR ODORS SYMPTOM

DEFINITIONS: Vehicle fails an emission test. There is excessive “rotten egg” smell. (Excessive odors do not
necessarily indicate excessive emissions.)

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2

Go to OBD

System Check

1. Perform a bulletin search.

2. If a bulletin that addresses the symptom is found,

correct the condition as instructed in the bulletin.

Was a bulletin found that addresses the symptom?

—

Verify repair

Go to Step 3

Was a visual/physical check performed?

—

Go to Step 4

Go to Visual /

physical Check.

Does the customer continual accelerate On/Off during
cold condition?

—

System OK

Go to Step 5

Is the customer using the incorrect fuel type?

—

Replace with

unleaded fuel

Go to Step 6

Check for vacuum leaks (vacuum lines, intake
manifold, throttle body, etc.)
Were any vacuum leaks found?

—

Go to Step 17

Go to Step 7

1. Check fuel cap for proper installation.

2. Secure the fuel cap if necessary.

Was a problem found?

—

Go to Step 17

Go to Step 8

Check the fuel pressure. Refer to Fuel System
Pressure Test.
Was a problem found?

—

Go to Step 17

Go to Step 9

1. Check for faulty, plugged or incorrectly installed

PCV valve.

2. Verify that the PCV system is not plugged.

Was a problem found?

—

Go to Step 17

Go to Step 10

Check the injector connectors, if any of the injectors
are connected to an incorrect cylinder, correct as
necessary.
Was a problem found?

—

Go to Step 17

Go to Step 11

Perform the Injector Coil/Balance Test.
Was a problem found.

—

Go to Step 17

Go to Step 12

Check for a problem with the engine cooling system.
Was a problem found?

—

Go to Step 17

Go to Step 13

Check EVAP canister for fuel loading. Refer to
Evaporative Emission Control System.
Was a problem found?

—

Go to Step 17

Go to Step 14

Check the EVAP purge solenoid valve operation.
Is the valve operated normally?

—

Go to Step 17

Verify repair &

Go to Step 15

Check the exhaust system for a possible restriction:

• Damaged or collapsed pipes

• Internal catalytic converter failure
Was a problem found?

—

Verify repair &

Go to Step 16

Go to Step 17

6E–252

ENGINE DRIVEABILITY AND EMISSIONS

1. Remove excessive carbon buildup with a top

engine cleaner. Refer to the instructions on the top
engine cleaner can.

2. Perform the exhaust emission test.

Does the vehicle pass the test?

—

System OK

Go to Step 18

Perform the exhaust emission test.
Does the vehicle pass the test?

—

System OK

Go to Step 18

Run Engine.
Check the fuel control Heated Oxygen Sensor
(HO2S). When monitored on the Tech 2, the HO2S
should respond quickly to different throttle positions. If
it doesn’t check for silicon or other contaminates from
fuel or use of improper sealant. The sensors may have
a white powdery coating. Silicon contamination sends
a rich exhaust signal which causes the ECM to
command and excessively lean air/fuel mixture.
Was a problem found?

—

Verify repair

Go to Step 19

Monitor “B1S1 (Bank 1 Sensor 1) Status” on the Tech
2.
Is the “B1S1 (Bank 1 Sensor 1) Status” in the rich
condition?

—

Go to Step 20

Go to Step 21

1. Check items that can cause the engine to run rich.

Refer to Diagnostic Aids in DTC P1167 “Fuel
Supply System Rich During Deceleration Fuel Cut
Off”. Make any necessary repairs.

2. Perform the exhaust emission test.

Does the vehicle pass the test?

—

System OK

Go to Step 22

1. Check items that can cause the engine to run

lean. Refer to Diagnostic Aids in DTC P1171 “Fuel
Supply System Lean During Power Enrichment”.
Make any necessary repairs.

2. Perform the exhaust emission test.

Does the vehicle pass the test?

—

System OK

Go to Step 22

Check for the following engine mechanical problems
(refer to Engine Mechanical):

• Low compression

• Leaking cylinder head gaskets

• Worn camshaft

• Sticking or leaking valves

• Valve timing

• Broken valve springs
Was a problem found?

—

Verify repair

Go to Step 23

1. Review all diagnostic procedures within this table.

2. If all procedures have been completed and no

malfunctions have been found, review/inspect the
following:

• Visual/physical inspection

• Tech 2 data

• All electrical connections within a suspected

circuit and/or system

Was a problem found?

—

Verify repair

Go to Step 24

Step

Action

Value(s)

Yes

Content .. 250 251 252 253 ..