Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 187

6E–352

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

10

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 11

11

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 12

12

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

—

Go to Step 13

Go to Step 22

13

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

—

Verify repair

—

14

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 21

Go to Step 15

15

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 16

Step

Action

Value(s)

Yes

No

                  When idling or part-throttle                                            When accelerated

                                                                                     

                                                                                   

High

Desired

Low

Time

  Actual

High

Low

Desired

    Actual

Time

Vacuum Pump

Small Window

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–353

16

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 17

17

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 18

18

Remove the injection nozzles from the engine and
check for the following conditions. 

• Improper splay condition. 

• Operating pressure is incorrect. 
If a problem is found, repair as necessary. 
Was the problem found?

—

Replace the 

injection nozzle 

and verify repair

Go to Step 19

19

Check the engine compression pressure for each
cylinders. 
If a problem is found, repair as necessary. 
Was the problem found?

More than 30 

Mpa (31.0 kg/

cm

2

)

Verify repair

Go to Step 20

Step

Action

Value(s)

Yes

No

1

st

 Stage

2

nd

 Stage

20.0 - 21.0 Mpa

(204 - 214 kg/cm

2

)

34.3 - 35.8 Mpa

(350 - 365 kg/cm

2

)

6E–354

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

20

Check the inlet/exhaust valve clearance for each
valves. 
Are the valve clearances within the specified value?

0.4mm at cold 

(In/Ex)

Go to Step 21

Adjust and 

verify repair

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

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

23

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

—

Go to Step 24

Go to Step 25

24

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

—

25

Replace the injection pump assembly. 
Is the action complete?

—

Verify repair

—

Step

Action

Value(s)

Yes

No

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–355

ON-VEHICLE SERVICE PROCEDURE 

    ENGINE CONTROL MODULE 

(ECM)

Location 
Under the left-hand side seat.

Removal Procedure

1. Disconnect the negative battery cable.

2. Remove the seat left-hand side.

3. Roll up the floor carpet.

4. Remove four bolts from the ECM cover.

5. Disconnect the two connectors from the ECM.

Installation Procedure

1. Connect the two connectors to the ECM.

2. Put on the ECM to the floor panel. 

3. Tighten the ECM cover by four bolts with specified

tightening torque. 

Tightening torque

• Bolts: 8.0 - 12.0 N·m (0.8 - 1.2 kgf·m)

4. Lay the floor carpet exactly.

5. Put on the seat to the floor panel and tighten with

specified tightening torque. 

Tightening torque

• Bolts: 40.0 N·m (4.1 kgf·m)

6. Connect the negative battery cable.

NOTE: 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.