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Isuzu Rodeo UE. Manual - part 417

6E2–423

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Surges and/or Chuggles Symptom

(Cont'd)

Step

Yes

Value(s)

Action

1. Check the exhaust system for possible restriction:

Inspect the exhaust system for damaged or
collapsed pipes.

Inspect the muffler for heat distress or possible
internal failure.

Check for a possible plugged three-way
catalytic converter by checking the exhaust
system back pressure. Refer to

Restricted

Exhaust System Check.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 19

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

Freeze Frame data/Failure Records buffer

All electrical connections within a suspected
circuit and/or system.

3. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Contact

Technical

Assistance

6E2–424

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Lack of Power, Sluggish or Spongy Symptom

Step

Action

Value(s)

Yes

DEFINITION:
Engine delivers less than expected power. Little or no
increase in speed when accelerator pedal is pushed
down part-way.

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/Physic

al Check

1. Remove and check the air filter element for dirt or

restrictions. Refer to

Air Intake System in

On-Vehicle Service.

2. Replace the air filter element if necessary.

Was a repair required?

—

Verify repair

Go to

Step 5

1. Check for low fuel pressure. Refer to

Fuel System

Pressure Test.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 6

1. Check for water-or alcohol-contaminated fuel.
2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 7

1. Using a Tech 2, monitor the knock sensor (KS)

system for excessive spark retard activity. Refer to
Knock Sensor (KS) System.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 8

1. Install the Tech 2.
2. Run the engine at idle.
3. On the Tech 2, select F3: Miscellaneous Test, F6:

Variable Intake Manifold.

4. Repeat Switch ON or OFF of VIM solenoid valve by

using the Tech 2.

5. Check the working solenoid sound if the actuator

works normally.

6. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 9

1. Check for proper ignition voltage output with spark

tester J 26792 (ST-125). Refer to

Electronic Ignition

System for procedure.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 10

6E2–425

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Lack of Power, Sluggish or Spongy Symptom

(Cont'd)

Step

Yes

Value(s)

Action

1. Remove the spark plugs and check for wet plugs,

cracks, wear, improper gap, burned electrodes, or
heavy deposits. Refer to

Electronic Ignition

System.

NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 11

1. Check the ignition coils for cracks or carbon

tracking.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 12

1. Check the PCM grounds for the cleanliness,

tightness and proper locations. Refer to the PCM
wiring diagrams in

Electrical Diagnosis.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 13

1. Check the exhaust system for possible restriction:

Inspect the exhaust system for damaged or
collapsed pipes.

Inspect the muffler for heat distress or possible
internal failure.

Check for a possible plugged three-way
catalytic converter by checking the exhaust
system back pressure. Refer to

Restricted

Exhaust System Check.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 14

1. Check the torque converter clutch (TCC) for proper

operation. Refer to

4L30–E Transmission

Diagnosis.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 15

1. Check for an engine mechanical problem. Check

for low compression, incorrect or worn camshaft,
loose timing belt, etc. Refer to

Engine Mechanical.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 16

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

Freeze Frame data/Failure Records buffer

All electrical connections within a suspected
circuit and/or system.

3. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Contact

Technical

Assistance

6E2–426

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Detonation/Spark Knock Symptom

Step

Action

Value(s)

Yes

DEFINITION:
A mild to severe ping, usually worse under acceleration.
The engine makes sharp metallic knocks that change
with throttle opening.

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/Physic

al Check

If Tech 2 readings are normal (refer to

Typical Scan

Values) and there are no engine mechanical faults, fill
the fuel tank with a known quality gasoline that has a
minimum octane rating of 87 and re-evaluate the
vehicle performance.

Is detonation present?

—

Go to

Step 5

Verify repair

1. Check the transmission range switch circuit. Use a

Tech 2 and be sure the Tech 2 indicates that the
vehicle is in drive with the gear selector in drive or
overdrive.

2. If a problem is found, diagnose and repair the

transmission range switch as necessary (refer to
4L30-E Automatic Transmission Diagnosis).

Was a problem found?

—

Verify repair

Go to

Step 6

1. Check TCC operation. Refer to

4L30-E

Transmission Diagnosis.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 7

1. Check for obvious overheating problems:

Low engine coolant.

Restricted air flow to radiator, or restricted
water flow through radiator.

Correct coolant solution should be a 50/50 mix
of approved antifreeze/coolant and water.
Refer to

Engine Cooling.

EGR operation. Refer to

DTC P0401.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 8

1. Check fuel pressure. Refer to

Fuel System

Pressure Test.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 9

Content .. 415 416 417 418 ..