Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 376
6E–534
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Bank 2 Restricted Exhaust System Check
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Remove the Bank 2 HO2S 2.
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:
D
Collapsed pipe
D
Heat distress
D
Internal muffler failure
Is the action complete?
—
Verify repair
—
4
1. Install the Bank 2 HO2S 2.
2. Install the Exhaust Back pressure 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 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.
6E–535
6VE1 3.5L 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. ETC system check.
3. Sensors (ECT, MAP, MAF, TP) ;
MAP output chart.
4. Fuel system electrical test, fuel
system diagnosis.
5. Ignition system.
Engine Mechanical, Ignition
System Check, Exhaust System
Diagnosis
6E–536
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Symptoms
Default Section(s)
Initial Diagnosis
Surges and/or Chuggles
1. OBD system check.
2. ETC system check.
3. Heated oxygen sensors.
4. Fuel system diagnosis.
5. Ignition system.
Calibration ID/Service Bulletins,
Ignition System Check,
Generator Output, Exhaust
System Diagnosis, 4L30-E
System Test
Lack of Power, Sluggish or Spongy
1. OBD system check.
2. ETC system check.
3. Fuel system diagnosis.
4. Ignition system.
5. EGR operation.
6. EGR system check.
Refer to
Exhaust System in
Engine Exhaust, TCC Operation,
Calibration ID/Service Bulletins
Detonation/Spark Knock
1. OBD system check.
2. Transmission range switch.
3. EGR operation.
4. EGR system check.
5. TCC operation.
6. Fuel system diagnosis.
7. Ignition system.
8. ION sensing module check.
TCC operation, Cooling System,
Ignition System Check,
Calibration ID/Service Bulletins
Rough, Unstable, or Incorrect Idle,
Stalling
1. OBD system check.
2. ETC system check.
3. Fuel injector and fuel injector
balance test.
4. EVAP emission canister purge
valve check.
5. Ignition system.
6. EGR operation.
MAP Output Check, Throttle
Linkage, EGR System Check,
A/C Clutch Control Circuit
Diagnosis, Crankcase Ventilation
System, Calibration ID/Service
Bulletins, Generator Output
Voltage (refer to
Chassis
Electrical), Exhaust Diagnosis
Poor Fuel Economy
1. OBD system check.
2. Careful visual/physical inspection.
3. Ignition system.
4. Cooling system.
TCC Operation, Exhaust System
(refer to
Engine Exhaust)
Hesitation, Sag, Stumble
1. OBD system check.
2. ETC system check.
3. TP.
4. MAP output check.
5. Fuel system diagnosis.
6. Fuel injector and fuel injector
balance test.
7. EVAP emission canister purge
valve.
8. Ignition system.
EGR Operation, EGR System
Check, Generator Output
Voltage (refer to
Chassis
Electrical), Calibration ID/Service
Bulletins, Ignition System Check
Cuts Out, Misses
1. OBD system check.
2. Cylinder balance test.
3. ETC system check.
Ignition System Check
Engine Cranks But Will Not Run
1. OBD system check.
Fuel System Electrical
Diagnosis, Fuel System
Diagnosis, Fuel Injector and Fuel
Injector Balance Test.
6E–537
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Symptoms
Default Section(s)
Initial Diagnosis
Excessive Exhaust Emissions or
Odors
1. OBD system check.
2. Emission test.
3. Cooling system.
4. Fuel system diagnosis.
5. Fuel injector and fuel injector
balance test.
6. EVAP emission canister purge
valve.
7. Crankcase ventilation system.
8. Ignition system.
9. MAP output check.
EGR System Check, Exhaust
Diagnosis, Calibration ID/Service
Bulletins
Dieseling, Run-On
1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.
—
Backfire
1. OBD system check.
2. Ignition system.
3. Fuel system diagnosis.
4. Fuel injector and fuel injector
balance test.
5. EGR operation, EGR system
check.
Exhaust System Diagnosis,
Intake Casting Flash, Ignition
System Check
Misfire
1. OBD system check.
2. Ignition system.
3. Fuel system diagnosis.
4. Fuel injector and fuel injector
balance test.
Vibrations, Transmission,
Driveshaft and Axle
Catalyst Monitor
1. OBD system check.
2. Careful visual/physical inspection.
3. Heated oxygen sensors.
Exhaust System
Fuel Trim
1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.
4. Heated oxygen sensors, MAF
sensors.
Exhaust System Intake Air
System
Evaporative Emissions
1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.
—
Heated Oxygen Sensors
1. OBD system check.
2. Careful visual/physical inspection.
Exhaust System
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