Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 177

6E–312

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Monitor the “Neutral Switch” in the data display.

Does the Tech 2 indicate correct “Neutral Switch”
status depending on any shift positions?
If a problem is found, repair as necessary.
Was the problem found?

—

Verify repair

Go to Step 9

1. Using the Tech 2, ignition “On” and engine “Run”.

2. Monitor the “A/C Information Switch” in the data

display.

Does the Tech 2 indicate correct “A/C Information
Switch” status depending on A/C switch position?
If a problem is found, repair as necessary.
Was the problem found?

—

Verify repair

Go to Step 10

1. Using the Tech 2, display the ECT sensor and IAT

sensor value.

2. Check the displayed value.

Does the Tech 2 indicate correct temperature
depending on engine condition?
If a problem is found, repair as necessary.
Was the problem found?

—

Verify repair

Go to Step 11

1. Using the Tech 2, ignition “On” and engine “Run”.

2. Monitor the “Mass Air Flow” in the data display.

Does the Tech 2 indicate correct “Mass Air Flow”
depending on accelerator pedal operation?

—

Go to Step 16

Go to Step 12

Remove the MAF & IAT sensor assembly and check
for the following conditions.

• Objects blocking at the MAF sensor element.
If a problem is found, repair as necessary.
Was the problem found?

—

Verify repair

Go to Step 13

Check the MAF sensor harness for the following
conditions.

• Check for poor connector connection.

• Check for misrouted harness.

• Check for any accessory parts which may cause

electric interference.

If a problem is found, repair as necessary.
Was a problem found?

—

Verify repair

Go to Step 14

Substitute a known good MAF & IAT sensor assembly
and recheck.
Was the problem solved?

—

Go to Step 15

Go to Step 36

Replace the MAF & IAT sensor assembly.
Is the action complete?

—

Verify repair

—

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Monitor the “Pedal/Throttle Position” and “Idle

Switch” in the data display.

Does the Tech 2 indicate correct “Pedal/Throttle
Position” from 0% to 100% and correct “Idle Switch”
status depending on accelerator pedal operation?

—

Go to Step 21

Go to Step 17

Step

Action

Value(s)

Yes

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–313

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Monitor the “Pedal/Throttle Position” and “Idle

Switch” in the data display.

3. Adjust the accelerator cable or TPS within 0% to

100%.

Was the problem solved?

—

Verify repair

Go to Step 18

Check the TPS harness for the following conditions.

• Check for poor connector connection.

• Check for misrouted harness.

• Check for any accessory parts which may cause

electric interference.

If a problem is found, repair as necessary.
Was a problem found?

—

Verify repair

Go to Step 19

Substitute a known good TPS and recheck.
Was the problem solved?

—

Go to Step 20

Go to Step 36

Replace the TPS.
Is the action complete?

—

Verify repair

—

Remove the CKP sensor from the flywheel housing
and check for the following conditions.

• Objects sticking the CKP sensor.

• Objects sticking the CKP sensor pulser.
If a problem is found, repair as necessary.
Was the problem found?

—

Verify repair

Go to Step 22

Check the CKP sensor harness for the following
conditions.

• Check for poor connector connection.

• Check for misrouted harness.

• Check for any accessory parts which may cause

electric interference.

If a problem is found, repair as necessary.
Was a problem found?

—

Verify repair

Go to Step 23

Substitute a known good CKP sensor and recheck.
Was the problem solved?

—

Go to Step 24

Go to Step 25

Replace the CKP sensor.
Is the action complete?

—

Verify repair

—

Step

Action

Value(s)

Yes

6E–314

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

1. Using the Tech 2 and ignition “On” and engine

“Run”.

2. Monitor the following parameters in the data

display.

• “Desired Injection Quantity” & “Injection Quantity”

• “Desired Injection Start” & “Actual Injection Start”
Are the large gap or unstable parameter displayed
between “Desired” and “Actual”?

—

Go to Step 29

Go to Step 26

Using the vacuum pump and check the EGR valve (if
equipped) operation for the following condition through
the small window.

• Restrict shaft movement. Check for objects sticking

the shaft, broken diaphragm or excessive carbon
deposit.

If a problem is found, repair as necessary.
Was a problem found?

—

Verify repair

Go to Step 27

Step

Action

Value(s)

Yes

When idling or part-throttle

High

Desired

Low

Time

Actual

Vacuum Pump

Small Window

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–315

Using the vacuum pump and check the exhaust
throttle valve (if equipped) operation for the following
condition.

• Restrict shaft movement. Check for objects sticking

the shaft, broken diaphragm or excessive carbon
deposit.

Was a problem found?

—

Verify repair

Go to Step 28

Check the exhaust system for a possible restriction.

• Damaged or collapsed pipes or catalytic converter.

• Internal muffler failure.
If a problem is found, repair as necessary.
Was a problem found?

—

Verify repair

Go to Step 29

Visually/physically inspect for the following conditions.

• Restrict fuel supply system. Check for a pinched

fuel hose/pipe.

• Check for a condition that causes fuel waxing or

icing, such as the customer is using an incorrect
fuel type in winter season or water mixed with the
fuel.

If a problem is found, repair as necessary.
Was a problem found?

—

Verify repair

Go to Step 30

Replace the fuel filter.
Was the problem solved?

—

Verify repair

Go to Step 31

Step

Action

Value(s)

Yes

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