2004 ISUZU TF SERIES check engine

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–181
5 V i s u a l l y / p h y s i c a l l y i n s p e c t f o r t h e f o l l o w i n g c o n d i t i o n s .
Restrict fuel supply system. Check for a pinched
fuel ho se /pi pe.
Check for a condition that causes fuel wax ing or
icing, such as the customer is using an incorrect
fuel type in winter season or water mix ed with the
f u e l.
If a problem is found, repair as necessary.
Was a problem found? - Verify repair Go to Step 6
6 Replace the fuel fi lt er.
Was the problem solved? - Verify repair Go to Step 7
7 Remove the eye bolt with gauze filter from the
injection pump and check for the following conditions.

Objects blocking at the gauze filter. Check for a
condition that causes contaminated fuel, such as
the customer is using an aftermarket fuel filter or
ex tended maintenance interval.
Check for a condition that causes fuel wax ing or
icing, such as the customer is using an incorrect
fuel type in winter season or water mix ed with the
f u e l.
If a problem is found, repair as necessary.
Was the problem found?
-Replace the
eye bolt with
gauze filter and
verify repair Go to Step 8
8 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 9
9 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 "Immobilizer System-ECM replacement" for
the ECM/Immobilizer linking procedure. - Go to Step 10Go to Step 11 Step Action Value(s) Yes No

6E–184 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
Condition for setting the DTC and action taken when the DTC sets
Circuit description
The ECM monitors altitude from the barometric
pressure sensor. To apply specified vacuum pressure to
the turbocharger wastegate valve, ECM sends control
signal to the wastegate control solenoid depending on
altitude.
Then, apply vacuum pressure to the turbocharger
wastegate valve is monitored by the ECM form the
vacuum pressure sensor output signal. The ECM
controls wastegate control solenoid based on signal
from vacuum pressure sensor output.
If the vacuum pressure sensor detected vacuum
pressure is excessively low or high due to faulty vacuum
line, vacuum pump or turbocharger wastegate valve,
DTC P0243 (Symptom Code 3), P0243 (Symptom Code
5) or P0243 (Symptom Code 6) will be stored.
If the wastegate control solenoid circuit is open or short
to ground circuit, DTC P0243 (Symptom Code 4) will be
stored.
If the wastegate control solenoid circuit is short to
voltage circuit, DTC P0243 (Symptom Code 8) will be
stored.
Diagnostic Aids
An intermittent may be caused by the following:
Poor connections.
Misrouted harness.
Rubbed through wire insulation.
Broken wire inside insulation.
Turbocharger wastegate valve sticking or broken.
Misrouted vacuum hose.
Faulty vacuum pump or regulating valve.
Check for the following conditions:
Poor connection at ECM-Inspect harness connectors
for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.
Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe
the DTC P0243 display on the Tech 2 while moving
connectors and wiring harnesses. A change in the
display will indicate the location of the fault.
Flash
CodeCode Symptom
CodeMIL DTC Name DTC Setting Condition Fail-Safe (Back Up)
64 P0243 3 ON Turbocharger Wastegate
So le no id "A" Ra nge/
Pe rfo rma nce1. Intake air temperature is
between -50 deg. C and
2 0 0 d e g . C .
2. Engine coolant
temperature is between -
50 deg. C and 150 deg.
C. 1. Fuel injection quantity is
r e d u c e d .
2. EGR EVRV becomes 10%
co nditio n.
4 ON Turbocharger Wastegate
So le no id "A" Lo w Wastegate control EVRV
circuit open or short to ground
circuit.1. Fuel injection quantity is
r e d u c e d .
2. EGR EVRV becomes 10%
c o n d i t i o n .
3. Wastegate control EVRV
be co mes 32% conditio n.
5 ON Turbocharger Wastegate
So le no id "A" Ra nge/
Pe rfo rma nce1. Intake air temperature is
between -50 deg. C and
2 0 0 d e g . C .
2. Engine coolant
temperature is between -
50 deg. C and 150 deg.
C. 1. Fuel injection quantity is
r e d u c e d .
2. EGR EVRV becomes 10%
co nditio n.
6 ON Turbocharger Wastegate
So le no id "A" Malfunctio n1. Engine coolant
temperature is between -
50 deg. C and 150 deg.
C .
2. EGR contro l EVRV 0%
co nditio n.
8 ON Turbocharger Wastegate
So le no id "A" HighWastegate control EVRV
circuit short to voltage circuit.1. Fuel injection quantity is
r e d u c e d .
2. EGR EVRV becomes 10%
c o n d i t i o n .
3. Wastegate control EVRV
be co mes 32% conditio n.

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–185
Diagnostic Trouble Code (DTC) P0243 (Symptom Code 3) (Flash Ccode 64)
Turbocharger Wastegate Solenoid "A" Range/Performance
Step Action Value(s) Yes No
1Was the "On-Board Diagnostic (OBD) System Check"
performed?
-Go to Step 2Go to On Board
Diagnostic
(OBD) System
Check
21. Connect the Tech 2.
2. Review and record the failure information.
3. Select "F0: Read DTC Infor As Stored By ECU" in
"F0: Diagnostic Trouble Codes".
Is the DTC P0243 (Symptom Code 3) stored as
"Present Failure"? -Go to Step 3Refer to
Diagnostic Aids
and Go to Step
3
31. Using the Tech 2, ignition "On" and engine "Off".
2. Select "F1: Clear DTC Information" in "F0:
Diagnostic Trouble Codes" with the Tech 2 and
c l e a r t h e D T C i n f o r m a t i o n .
3. Operate the vehicle and monitor the "F0: Read
DTC Infor As Stored By ECU" in the "F0:
Diagnostic Trouble Codes".
Was the DTC P0243 (Symptom Code 3) stored in this
ignition cycle? - Go to Step 4Refer to
Diagnostic Aids
and Go to Step
4
4Remove the vacuum hose & vacuum regulating valve
a n d c h e c k f o r t h e f o l l o w i n g c o n d i t i o n s .
O b j e c t s b l o c k i n g t h e v a c u u m h o s e .
O b j e c t s b l o c k i n g t h e v a c u u m r e g u l a t i n g v a l v e .
Vacuum leaking at vacuum hose or vacuum
regu lat i ng v alv e.
Objects blocking at the wastegate solenoid valve.
If a problem is found, repair as necessary.
Was the problem found? - Verify repair Go to Step 5
5Remove the vacuum pressure sensor and visually
check.
Was the problem found? - Go to Step 6Go to Step 8
6Substitute a known good vacuum pressure sensor
a n d re ch e c k.
Was the problem solved? - Go to Step 7Go to Step 8
7R e p l a c e t h e v a c u u m p r e s s u r e s e n s o r.
Is the action complete? - Verify repair -

6E–186 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
8Using the DVM and check the wastegate control
solenoid.
1 . I g n i t i o n " O f f " , e n g i n e " O f f " .
2. Disconnect the wastegate solenoid connector.
3. Measure the resistance of wastegate solenoid
coil.
Does the tester indicate standard resistance?
Approx imately
14.7 - 16.1

at 20C
Go to Step 11Go to Step 9
9Substitute a known good wastegate control solenoid
a n d re ch e c k.
Was the problem solved? - Go to Step 10Go to Step 11
10Replace the wastegate control solenoid.
Is the action complete? - Verify repair -
11Using the pressure gauge and check the turbocharger
wastegate valve operation for broken diaphragm.
If a problem is found, repair as necessary.
Was a problem found? - Go to Step 12Go to Step 13
12R e p l a c e t h e t u r b o c h a r g e r w a s t e g a t e v a l v e .
Is the action complete? - Verify repair -
13Is 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 14
14R e p l a c e t h e E C M .
I s t h e a c t i o n c o mp l e t e ?
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 "Immobilizer System-ECM replacement" for
the ECM/Immobilizer linking procedure. - Verify repair - Step Action Value(s) Yes No
Wastegate Solenoid





4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–187
Diagnostic Trouble Code (DTC) P0243 (Symptom Code 4) (Flash Code 64)
Turbocharger Wastegate Solenoid "A" Low
Step Action Value(s) Yes No
1Was the "On-Board Diagnostic (OBD) System Check"
performed?
-Go to Step 2Go to On Board
Diagnostic
(OBD) System
Check
21. Connect the Tech 2.
2. Review and record the failure information.
3. Select "F0: Read DTC Infor As Stored By ECU" in
"F0: Diagnostic Trouble Codes".
Is the DTC P0243 (Symptom Code 4) stored as
"Present Failure"? - Go to Step 3Refer to
Diagnostic Aids
and Go to Step
3
31. 1Using the Tech 2, ignition "On" and engine "Off".
2. Select "F1: Clear DTC Information" in "F0:
Diagnostic Trouble Codes" with the Tech 2 and
c l e a r t h e D T C i n f o r m a t i o n .
3. Operate the vehicle and monitor the "F0: Read
DTC Infor As Stored By ECU" in the "F0:
Diagnostic Trouble Codes".
Was the DTC P0243 (Symptom Code 4) stored in this
ignition cycle? - Go to Step 4Refer to
Diagnostic Aids
and Go to Step
4
4Check for poor/faulty connection at the wastegate
control solenoid or ECM connector. If a poor/faulty
connection is found, repair as necessary.
Was the problem found?
- Verify repair Go to Step 5
5Using the DVM and check the wastegate control
solenoid.
1 . I g n i t i o n " O f f " , e n g i n e " O f f " .
2. Disconnect the wastegate solenoid connector.
3. Measure the resistance of wastegate solenoid
coil.
Does the tester indicate standard resistance?
Approx imately
14.7 - 16.1

at 20C
Go to Step 6Go to Step 9
C-57C-123

Wastegate Solenoid





6E–188 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value(s) Yes No
6Using the DVM and check the wastegate control
solenoid power supply circui t.
1 . I g n i t i o n " O n " , e n g i n e " O f f " .
2. Remove the wastegate control solenoid
connector.
3 . C h e c k t h e c i r c u i t f o r o p e n c i r c u i t .
Was the DVM indicated specified value? 10 - 14.5V Go to Step 8Go to Step 7
7Repair the open circuit between the ECM main relay
and wastegate control solenoid.
Is the action complete? - Verify repair -
8Using the DVM and check the wastegate control
solenoid circuit.
Breaker box is available:
1. Ignition "Off", engine "Off".
2. Install the breaker box as type A. (ECM
disconnected) Ref. Page 6E-103
3. Remove the wattage control solenoid connector.
4. Check the circuit for open or short to ground
circuit.
Was the problem found?
Breaker box is not available:
1. Ignition "Off", engine "Off".
2. Disconnect the ECM connector.
3. Remove the wastegate control solenoid
connector.
4. Check the circuit for open or short to ground
circuit.
Was the problem found?
-Repair faulty
harness and
verify repair Go to Step 11
9Substitute a known good wastegate control solenoid
a n d re ch e c k.
Was the problem solved? - Go to Step 10Go to Step 11
10Replace the wastegate control solenoid.
Is the action complete? - Verify repair -
96
Breaker BoxC-123




C-57C-123




6E–190 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0243 (Symptom Code 5) (Flash Code 64)
Turbocharger Wastegate Solenoid "A" Range/Performance
Step Action Value(s) Yes No
1Was the "On-Board Diagnostic (OBD) System Check"
performed?
-Go to Step 2Go to On Board
Diagnostic
(OBD) System
Check
21. Connect the Tech 2.
2. Review and record the failure information.
3. Select "F0: Read DTC Infor As Stored By ECU" in
"F0: Diagnostic Trouble Codes".
Is the DTC P0243 (Symptom Code 5) stored as
"Present Failure"? - Go to Step 3Refer to
Diagnostic Aids
and Go to Step
3
31. Using the Tech 2, ignition "On" and engine "Off".
2. Select "F1: Clear DTC Information" in "F0:
Diagnostic Trouble Codes" with the Tech 2 and
c l e a r t h e D T C i n f o r m a t i o n .
3. Operate the vehicle and monitor the "F0: Read
DTC Infor As Stored By ECU" in the "F0:
Diagnostic Trouble Codes".
Was the DTC P0243 (Symptom Code 5) stored in this
ignition cycle? - Go to Step 4Refer to
Diagnostic Aids
and Go to Step
4
4Visually check the vacuum regulating valve.
If a problem is found, repair as necessary.
Was the problem found? - Verify repair Go to Step 5
5Using the DVM and check the wastegate control
solenoid.
1 . I g n i t i o n " O f f " , e n g i n e " O f f " .
2. Disconnect the wastegate solenoid connector.
3. Measure the resistance of wastegate solenoid
coil.
Does the tester indicate standard resistance?
Approx imately
14.7 - 16.1

at 20C
Go to Step 8Go to Step 6
6Substitute a known good wastegate control solenoid
a n d re ch e c k.
Was the problem solved? - Go to Step 7Go to Step 8
7Replace the wastegate control solenoid.
Is the action complete? - Verify repair -
8Using the pressure gauge and check the turbocharger
wastegate valve operation for broken diaphragm.
If a problem is found, repair as necessary.
Was a problem found? - Go to Step 9Go to Step 10
9Replace the turbocharger wastegate valve .
Is the action complete? - Verify repair -
Wastegate Solenoid





4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–191
Step Action Value(s) Yes No
10Check for poor/faulty connection at the vacuum
pressure sensor or ECM connector. If a poor/faulty
connection is found, repair as necessary.
Was the problem found?
- Verify repair Go to Step 11
11V i s u a l l y c h e c k t h e v a c u u m p r e s s u r e s e n s o r .
Was the problem found? - Go to Step 13Go to Step 12
12Using the DVM and check the vacuum pressure
sensor signal circuit.
1. Ignition "On", engine "Off".
2. Disconnect the vacuum pressure sensor
connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
Less than 1V Go to Step 15Repair faulty
harness and
verify repair
13Substitute a known good vacuum pressure sensor
a s s e m b l y a n d r e c h e c k .
Was the problem solved? - Go to Step 14Go to Step 15
14Replace the vacuum pressure sensor assembly.
Is the action complete? - Verify repair -
15Is 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 16
16R e p l a c e t h e E C M .
I s t h e a c t i o n c o mp l e t e ?
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 "Immobilizer System-ECM replacement" for
the ECM/Immobilizer linking procedure. - Verify repair -
C-57C-123

C-124
V