Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1533

6E2–583

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

D

Vehicle surges during cruise.

D

Rough idle.

D

DTC P0300 (misfire detected).

Too little or no EGR flow may allow combustion
temperatures to get too high.  This could cause:

D

Spark knock (detonation).

D

Engine overheating.

D

Emission test failure.

D

DTC P0401 (EGR flow test).

D

Poor fuel economy.

0017

EGR Pintle Position Sensor

The PCM monitors the EGR valve pintle position input to
endure that the valve responds properly to  commands
from the PCM and to detect a fault if the pintle position
sensor and control circuits are open or shorted.  If the
PCM detects a pintle position signal voltage outside the
normal range of the pintle position sensor, or a signal
voltage that is not within a tolerance considered
acceptable for proper EGR system operation, the PCM
will set DTC P1406.

General Description (Positive
Crankcase Ventilation (PCV) System)

Crankcase Ventilation System Purpose

The crankcase ventilation system is use to consume
crankcase vapors in the combustion process instead of
venting them to the atmosphere.  Fresh air from the
throttle body is supplied to the crankcase and mixed with
blow-by gases.  This mixture is then passed through the
positive crankcase ventilation (PCV) valve into the
common chamber.

Crankcase Ventilation System Operation

The primary control is through the positive crankcase
ventilation (PCV) valve.  The PCV valve meters the flow at
a rate that depends on the intake vacuum.  The PCV valve
restricts the flow when the inlet vacuum is highest.  In

addition, the PCV valve can seal the common chamber
off in case of sudden high pressure in the crankcase.

028RV002

While the engine is running, exhaust fuses and small
amounts of the fuel/air mixture escape past the piston
rings and enter the crankcase.  These gases are mixed
with clean air entering through a tube from the air intake
duct.

060R200063

During normal, part-throttle operation, the system is
designed to allow crankcase gases to flow through the
PCV valve into the throttle body to be consumed by
normal combustion.

6E2–584

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

A plugged valve or PCV hose may cause the following
conditions:

D

Rough idle.

D

Stalling of slow idle speed.

D

Oil leaks.

D

Sludge in the engine.

A leaking PCV hose would cause:

D

Rough idle.

D

Stalling.

D

High idle speed.

6E2–585

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Special Tools

ILLUSTRATION

TOOL NO.

TOOL NAME

J 39200

High Impedance

Multimeter (Digital

Voltmeter – DVM)

(1) PCMCIA Card

(2) RS232 Loop Back

Connector

(3) SAE 16/19 Adapter

(4) DLC Cable

(5) TECH–2

J 34142-B

Unpowered Test Light

Connector Test Adapter

Kit J 35616-A/BT-8637

J 26792/BT-7220-1

Spark Tester

J 34730-E

Port Fuel Injection

Diagnostic Kit

ILLUSTRATION

TOOL NO.

TOOL NAME

J 37027-A

IAC Motor Analyzer

J 23738-A

Vacuum Pump with

Gauge

BT-8515/8515V

Exhaust Back Pressure

Tester

J 39194-B

Heated Oxygen Sensor

Wrench

J 35689-A

Terminal Remover

J 28742-A

Weather Pack II

Terminal Remover

6E2–586

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

ILLUSTRATION

TOOL NO.

TOOL NAME

J 39021-90

Injector Switch Box

J 39021-65

Injector Test Light

J 41413

!

EVAP Pressure/Purge

Diagnostic Station

J 41416

@

Ultrasonic Leak Detector

1. J 41413 EVAP Pressure/Purge Diagnostic Station is

a multipurpose tool which is used to perform several
diagnostic procedures for enhanced emission
testing.  The station will accommodate a nitrogen gas
filled cylinder which is used to pressurize the vehicle
EVAP system for a leakdown test and leak location
test when a vehicle is repaired for leakage in the
enhanced evaporative emission control system.  It
also has two additional gauges (inches of mercury
and inches of water) which are used to measure both
source vacuum and EVAP canister purge vacuum to
verify correct operation and vapor flow within the
canister purge circuit.

2. J 41416 Ultrasonic Leak Detector is a

microprocessor-based device used to detect leaks in
the enhanced evaporative emission control system.
The evaporative system is pressurized to 30 inches of
water using the J 41413 EVAP Pressure/Purge
Diagnostic System.  Small leaks in the EVAP system
will emit sound at a high frequency undetectable by a
human ear but detectable with the J 41416.  The
technician traces along the evaporative system and
can pinpoint leaks due to corroded lines, cracked
hoses, or a damaged EVAP component.  The
detector includes a high quality set of headphones to
block out surrounding shop noise and the LED
sensitivity meter allows a visual reference for locating
leaks in conjunction with the audio output heard
through the headphones.  Powered by (1) nine volt
battery.