2004 ISUZU TF SERIES engine

6E–112 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
CHECK ENGINE LAMP (MIL) “ON” STEADY
Circuit description
The check engine lamp should always be illuminated
and steady for about five seconds with ignition “ON” and
the engine stopped. Ignition feed voltage is supplied
directly to the check engine lamp indicator. The Engine
Control Module (ECM) turns the check engine lamp
“ON” by grounding the check engine lamp driver circuit.
The check engine lamp should not remain “ON” with the
engine running and no DTC(s) set. A steady check
engine lamp with the engine running and no DTC(s)
suggests a short to ground in the check engine lamp
driver circuit.
Diagnostic Aids
An intermittent may be caused by a poor connection,
rubbed-through wire insulation, or a wire broken inside
the insulation. Check for the following items:
Poor connection or damaged harness – Inspect the
ECM harness and connectors for improper mating,
broken locks, improperly formed or damaged
terminals, poor terminal-to-wire connection, and
damaged harness.

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–11 3
Check Engine Lamp (MIL) On Steady
Step Action Value(s) Yes No
1 1. Ignition “Off”, engine “Off”.
2. Disconnect the ECM connector.
3. Ignition “On”.
Was the “CHECK ENGINE” lamp turned on?—Go to Step 2 Go to Step 4
2 Using the DVM and check the “CHECK ENGINE”
lamp circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the meter connector and ECM
connector.
3. Check the circuit for short to ground circuit.
Was the problem found?
—Veri fy repai rGo to Step 3
3 Replace the meter assembly.
Is the action complete?—Veri fy repai r—
4 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?—Veri fy repai rGo to Step 5
5 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 immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.—Veri fy repai r—
42
17
B-24 C-56

6E–114 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONSECM Diagnostic Trouble CodesFlash
CodeCodeSymptom
CodeMILDTC Name DTC Setting Condition Fail-Safe (Back Up) Recovery Condition Related Failure PartsRelated
ECM Pin
No.Related
Multiple
DTC4JA1-TC
(MT)4JH1-TC
(MT)4JH1-TC
(AT)
65 P0100 7 ON Mass Air Flow (MAF) Sensor
Voltage Supply Circuit High
InputMAF sensor power supply
voltage is more than 5.2V.ECM uses mass air flow
1600mg/strk & EGR 10%
conditions as substitute.MAF sensor power supply
voltage is below 5.2V.1. Sensor power supply
circuit short to battery
voltage circuit.
2. MAF sensor malfunction.
3. ECM malfunction.83 —
9 ON Mass Air Flow (MAF) Sensor
Voltage Supply Circuit Low
InputMAF sensor power supply
voltage is below 4.6V.MAF sensor power supply
voltage is more than 4.6V.1. Sensor power supply
circuit short to ground
c i r c u i t .
2. MAF sensor malfunction.
3. ECM malfunction.83 —
B ON Mass Air Flow (MAF) Sensor
Output Circuit Low Input1. Engine speed is between
600rpm and 5000rpm.
2. MAF sensor output is
below -33.7mg/strk.MAF sensor output is more
than -27.4mg/strk.1. Sensor power supply
circuit open circuit.
2. Sensor signal circuit
open or short to ground
c i r c u i t .
3. Sensor heater harness
o p e n c i r c u i t .
4. Poor connector
c o n n e c t i o n .
5. MAF sensor malfunction.
6. ECM malfunction.8 3 /
88P0110(1)
C ON Mass Air Flow (MAF) Sensor
Output Circuit High Input1. Engine speed is between
600rpm and 5000rpm.
2. MAF sensor output is
more than 1378mg/strk
(4JA1-TC) or 1784mg/
strk (4JH1-TC).MAF sensor output is below
1378mg/strk (4JA1-TC) or
1784mg/strk (4JH1-TC).1. Sensor signal circuit
short to voltage circuit.
2. Sensor ground circuit
open or short to voltage
c i r c u i t .
3. MAF sensor malfunction.
4. ECM malfunction.8 8 /
92P0110(1)
34 P0105 1 ON Vacuum Pressure Sensor
Circuit High InputVacuum sensor output
voltage is more than 4.4V.1. Fuel injection quantity is
r e d u c e d .
2. ECM use 615hpa
conditions for
turbocharger waste gate
control.Vacuum sensor output
voltage is below 4.4V.1. Sensor signal circuit
short to voltage circuit.
2. Sensor ground circuit
open or short to voltage
c i r c u i t .
3. Vacuum sensor
m a l f u n c t i o n .
4. ECM malfunction.8 5 /
93P0115(1) —
2 ON Vacuum Pressure Sensor
Circuit Low InputVacuum sensor output
voltage is below 0.5V.Vacuum sensor output
voltage is more than 0.5V.1. Sensor power supply
circuit open circuit.
2. Sensor signal circuit
open or short to ground
c i r c u i t .
3. Poor connector
c o n n e c t i o n .
4. Vacuum sensor
m a l f u n c t i o n .
5. ECM malfunction.8 2 /
85——

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–115
34 P0105 7 ON Vacuum Pressure Sensor
Voltage Supply Circuit High
InputVacuum sensor power
supply voltage is more than
5.2V.1. Fuel injection quantity is
r e d u c e d .
2. ECM use vacuum sensor
output voltage 5.0V
condition as substitute.Vacuum sensor power
supply voltage is below 5.2V.1. Sensor power supply
circuit short to battery
voltage circuit.
2. Vacuum sensor
m a l f u n c t i o n .
3. ECM malfunction.82 — —
9 ON Vacuum Pressure Sensor
Voltage Supply Circuit Low
InputVacuum sensor power
supply voltage is below 4.5V.Vacuum sensor power
supply voltage is more than
4.5V.1. Sensor power supply
circuit short to ground
c i r c u i t .
2. Vacuum sensor
m a l f u n c t i o n .
3. ECM malfunction.82 — —
23 P0110 1 ON Intake Air Temperature (IAT)
Sensor Circuit High InputIAT sensor output voltage is
more than 4.7V.ECM use 0 deg. C conditions
as substitute.IAT sensor output voltage is
below 4.7V.1. Sensor signal circuit
open or short to voltage
c i r c u i t .
2. Sensor ground circuit
open or short to voltage
c i r c u i t .
3. Poor connector
c o n n e c t i o n
4. IAT sensor malfunction.
5. ECM malfunction.8 4 /
92P0100(B)/







P0100(C)
2 ON Intake Air Temperature (IAT)
Sensor Circuit Low InputIAT sensor output voltage is
below 0.3V.IAT sensor output voltage is
more than 0.3V.1. Sensor signal circuit
short to ground circuit.
2. IAT sensor malfunction.
3. ECM malfunction.84 —
14 P0115 1 ON Engine Coolant Temperature
(ECT) Sensor Circuit High
InputECT sensor output voltage is
more than 4.7V.1. ECM uses fuel
temperature as
s u b s t i t u t e .
2. ECM uses 60 deg. C
condition for injection
t i m i n g c o n t r o l .
3. ECM uses -25 deg. C
condition (4JA1-TC) or -
15 deg. C condition
(4JH1-TC) for glow time
control.ECT sensor output voltage is
below 4.7V.1. Sensor signal circuit
open or short to voltage
c i r c u i t .
2. Sensor ground circuit
open or short to voltage
c i r c u i t .
3. Poor connector
c o n n e c t i o n
4. ECT sensor malfunction.
5. ECM malfunction.8 9 /
93P0105(1)
2 ON Engine Coolant Temperature
(ECT) Sensor Circuit Low
InputECT sensor output voltage is
below 0.3V.ECT sensor output voltage is
more than 0.3V.1. Sensor signal circuit
short to ground circuit.
2. ECT sensor malfunction.
3. ECM malfunction.89 —
15 P0180 B ON Fuel Temperature Sensor
Circuit Range/PerformanceFT sensor output is high
temperature (more than 150
deg. C) or low temperature
(below -40 deg. C).The ECM use 75 deg. C
conditions as substitute.FT sensor output is correct
temperature range between
150 deg. C and -40 deg. C.1 . E C M m a l f u n c t i o n .
2. PSG (pump control unit)
malfunction.—— Flash
CodeCodeSymptom
CodeMILDTC Name DTC Setting Condition Fail-Safe (Back Up) Recovery Condition Related Failure PartsRelated
ECM Pin
No.Related
Multiple
DTC4JA1-TC
(MT)4JH1-TC
(MT)4JH1-TC
(AT)

6E–116 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
52 P0215 A ON Fuel Cutoff Solenoid Valve
Malfunction1. Ignition key switch off.
2. Engine speed is below
1 5 0 0 r p m .
3. Vehicle speed is below
1 . 5 k m / h .
4. PSG (pump control unit)
recognizes MAB (fuel
cutoff solenoid valve)
signal from the ECM, but
the MAB could not
operate. 1. MAB (fuel cutoff solenoid
v a l v e ) i s o p e r a t e d .
2. Desired injection quantity
becomes 0mg/strk.No recovery until condition
match in the next ignition key
cycle.1. PSG (pump control unit)
m a l f u n c t i o n .
2. MAB (fuel cutoff solenoid
valve) malfunction.
——
B ON Fuel Cutoff Solenoid Valve
Circuit High InputECM does not command
MAB (fuel cutoff solenoid
valve) signal to the PSG
(pump control unit), but PSG
detected MAB signal line
circuit is high level.Engine does not start. No recovery. 1. MAB (fuel cutoff solenoid
valve) signal circuit short
t o v o l t a g e c i r c u i t .
2. PSG (pump control unit)
malfunction.105 —
C ON Fuel Cutoff Solenoid Valve
Always Active1. Ignition key switch off.
2. Engine speed is below
1 5 0 0 r p m .
3. Vehicle speed is below
1 . 5 k m / h .
4. PSG (pump control unit)
does not recognize MAB
(fuel cutoff solenoid
valve) signal from the
ECM. 1. MAB (fuel cutoff solenoid
v a l v e ) i s o p e r a t e d .
2. Desired injection quantity
becomes 0mg/strk.No recovery until condition
match in the next ignition key
cycle.1. MAB (fuel cutoff solenoid
valve) signal circuit open
or short to ground circuit.
2. PSG (pump control unit)
malfunction.
105 —
D ON Fuel Cutoff Solenoid Valve
Malfunction1. Ignition key switch off.
2. CAN controller does not
operate Bus-off.N o f a i l - s a f e f u n c t i o n . 1 . E C M m a l f u n c t i o n .
2. PSG (pump control unit)
malfunction.——
54 P0216 A ON Injection Timing Control
Circuit Malfunction1. Engine speed is more
t h a n 7 0 0 r p m .
2. Fuel injection quantity is
more than 4mg/stk.
3. Deviation of actual
injection timing and
desired injection timing is
more than +3 deg. CA or
-6 deg. CA for 8 seconds.Fuel injection quantity is
reduced.Deviation of actual injection
timing and desired injection
timing is more than +3 deg.
CA or -6 deg. CA for 8
seconds.1. Timing control valve
m a l f u n c t i o n .
2 . T i m e r p i s t o n s t i c k i n g .
3. Pump camshaft speed
sensor malfunction.——
B ON Injection Timing Control
Circuit Malfunction 1. Engine speed is more
t h a n 2 0 1 4 r p m .
2. Fluctuation of actual
injection timing is more
than +-5.2 deg. CA.1. Engine speed is more
than 2014rpm.
2. Fluctuation of actual
injection timing is more
than +-5.2 deg. CA.1. Insufficient air bleeding of
f u e l l i n e .
2. Fuel filter clogging.
3. Timing control valve
m a l f u n c t i o n .
4. Pump camshaft speed
sensor malfunction. —— Flash
CodeCodeSymptom
CodeMILDTC Name DTC Setting Condition Fail-Safe (Back Up) Recovery Condition Related Failure PartsRelated
ECM Pin
No.Related
Multiple
DTC4JA1-TC
(MT)4JH1-TC
(MT)4JH1-TC
(AT)

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–117
64 P0243 3 ON Turbocharger Wastegate
Solenoid "A" Range/
Performance1. 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 .
3. Barometric pressure is
between 0hpa and
3 5 0 0 h p a .
4. Low vacuum pressure
condition. (Desired
vacuum pressure - actual
vacuum pressure is more
than 50hpa.)1. Fuel injection quantity is
r e d u c e d .
2. EGR EVRV becomes
1 0 % c o n d i t i o n . 1. Engine speed is between
500rpm and 6000rpm.
2. Correct vacuum pressure
condition. (Desired
vacuum pressure - actual
vacuum pressure is less
than 50hpa.)1. Turbocharger wastegate
control EVRV
m a l f u n c t i o n .
2. Vacuum line is
o b s t r u c t e d .
3. Vacuum is leaking.
4. Vacuum pump
m a l f u n c t i o n .
5. Vacuum sensor
m a l f u n c t i o n .
6. Turbocahrger wastegate
v a l v e m a l f u n c t i o n .
7. ECM malfunction.8 5 /
96——
4 ON Turbocharger Wastegate
Solenoid "A" Low 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
1 0 % c o n d i t i o n .
3. Wastegate control EVRV
becomes 32% condition.Wastegate control EVRV
circuit is correct condition.1. Wastegate control EVRV
circuit open or short to
g r o u n d c i r c u i t .
2. Wastegate control EVRV
m a l f u n c t i o n .
3. ECM malfunction.96 — —
5 ON Turbocharger Wastegate
Solenoid "A" Range/
Performance1. 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 .
3. Barometric pressure is
between 0hpa and
3 5 0 0 h p a .
4. High vacuum pressure
condition. (Desired
vacuum pressure - actual
vacuum pressure is less
than -50hpa.)1. Fuel injection quantity is
r e d u c e d .
2. EGR EVRV becomes
1 0 % c o n d i t i o n . 1. Engine speed is between
500rpm and 6000rpm.
2. Correct vacuum pressure
condition. (Desired
vacuum pressure - actual
vacuum pressure is more
than -50hpa.)1. Turbocharger wastegate
control EVRV
m a l f u n c t i o n .
2. Vacuum regulating valve
m a l f u n c t i o n .
3. Vacuum pump
m a l f u n c t i o n .
4. Vacuum sensor
m a l f u n c t i o n .
5. ECM malfunction.8 5 /
96——
6 ON Turbocharger Wastegate
Solenoid "A" Malfunction1. Engine coolant
temperature is between -
50 deg. C and 150 deg.
C .
2. EGR control EVRV 0%
c o n d i t i o n .
3. No DTC relating to MAF
sensor, vacuum sensor &
I A T s e n s o r .
4. Large amount of mass air
flow. (= Incorrect boost
pressure condition)
(Desired mass air flow -
actual mass air flow is
less than -56mg/strk.)1. Correct amount of mass
air flow. (= Correct boost
pressure condition)
(Desired mass air flow -
actual mass air flow is
more than -56mg/strk.)1. Turbocharger wastegate
a c t u a t o r m a l f u n c t i o n .
2. Vacuum line malfunction.

































3. ECM malfunction.
——— Flash
CodeCodeSymptom
CodeMILDTC Name DTC Setting Condition Fail-Safe (Back Up) Recovery Condition Related Failure PartsRelated
ECM Pin
No.Related
Multiple
DTC4JA1-TC
(MT)4JH1-TC
(MT)4JH1-TC
(AT)

6E–118 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
64 P0243 8 ON Turbocharger Wastegate
Solenoid "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
1 0 % c o n d i t i o n .
3. Wastegate control EVRV
becomes 32% condition.Wastegate control EVRV
circuit is correct condition.1. Wastegate control EVRV
circuit short to voltage
c i r c u i t .
2. Wastegate control EVRV
m a l f u n c t i o n .
3. ECM malfunction.96 — —
53 P0251 6 ON Injection Pump Malfunction 1. No pump camshaft
s p e e d s e n s o r e r r o r .
2. High pressure solenoid
valve control pulse width
does not match with
desired fuel injection
quantity. 1. MAB (fuel cutoff solenoid
v a l v e ) i s o p e r a t e d .
2. Desired injection quantity
becomes 0mg/strk.No recovery until condition
match in the next ignition key
cycle.1. PSG (pump control unit)
m a l f u n c t i o n .
2. Pump camshaft speed
sensor malfunction.——
7 ON Injection Pump Malfunction 1. No pump camshaft
s p e e d s e n s o r e r r o r .
2 . N o C K P s e n s o r e r r o r .
3. Difference of engine
speed and doubled pump
camshaft speed is more
than 720rpm (4JA1-TC)
or 690rpm (4JH1-TC). 1. No pump camshaft
s p e e d s e n s o r e r r o r .
2 . N o C K P s e n s o r e r r o r .
3. Difference of engine
speed and doubled pump
camshaft speed is below
800rpm (4JA1-TC) or
6 9 0 r p m ( 4 J H 1 - T C ) .
No recovery until in the
next ignition key cycle. 1. Missing CKP sensor
p u l s e s .
2. Electrical interference.
3. Magnetic interference.
4. PSG (pump control unit)
malfunction.91 —
9 ON Injection Pump Malfunction No pump map programmed
in the PSG (pump control
unit) or PSG malfunction.No recovery until condition
match in the next ignition key
cycle.PSG (pump control unit)
malfunction. — —
A ON Injection Pump Malfunction EEPROM or A/D converter
malfunction in the PSG
(pump control unit).Fuel injection quantity is
reduced.EEPROM or A/D converter
no malfunction in the PSG
( p u m p c o n t r o l u n i t ) .
No recovery until in the next
ignition key cycle.PSG (pump control unit)
malfunction.
——
B ON Injection Pump Malfunction PSG (pump control unit)
recognized high pressure
solenoid valve drive circuit
error.No fail-safe function. No recovery until condition
match in the next ignition key
cycle.PSG (pump control unit)
malfunction.
——
D ON Injection Pump Malfunction PSG (pump control unit)
could not measure the high
pressure solenoid valve drive
voltage.PSG (pump control unit)
malfunction.
——
E ON Injection Pump Malfunction ECM could not accept PSG
(pump control unit) message.1. MAB (fuel cutoff solenoid
v a l v e ) i s o p e r a t e d .
2. Desired injection quantity
becomes 0mg/strk.ECM accepts PSG (pump
control unit) message.1. CAN high circuit open,
short to ground or short
t o v o l t a g e c i r c u i t .
2. CAN low circuit open,
short to ground or short
t o v o l t a g e c i r c u i t .
3 . E C M m a l f u n c t i o n .
4. PSG (pump control unit)
malfunction.9 9 /
100P1650(A)/











P1651(B) Flash
CodeCodeSymptom
CodeMILDTC Name DTC Setting Condition Fail-Safe (Back Up) Recovery Condition Related Failure PartsRelated
ECM Pin
No.Related
Multiple
DTC4JA1-TC
(MT)4JH1-TC
(MT)4JH1-TC
(AT)

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–119
43 P0335 B ON Crankshaft Position Sensor
Circuit Malfunction1. Engine speed is more
t h a n 6 6 5 r p m .
2. CKP sensor pulse width
error.When pump camshaft speed
sensor is OK:
ECM uses doubled pump
camshaft speed as substitute
engine speed.
When pump camshaft speed
s e n s o r i s n o t O K :
1. MAB (fuel cutoff solenoid
v a l v e ) i s o p e r a t e d .
2. Desired injection quantity
becomes 0mg/strk. ECM detects correct CKP
pulse width.1 . D u r i n g e n g i n e r u n :
1. CKP sensor harness
open circuit, short to
ground or short to
voltage circuit.
2. Poor connector
c o n n e c t i o n .
3. CKP sensor malfunction.
4. Pulse sensing gap
i n c o r r e c t .
5 . P u l s e r m a l f u n c t i o n .
6. Electrical interference.
7. Magnetic interference.
8. ECM malfunction.9 0 /
9 8 /
101P1335 (A)
D ON Crankshaft Position Sensor
Circuit Malfunction1. No pump camshaft
s p e e d s e n s o r e r r o r .
2. "Crankshaft Position
Sensor Circuit
Malfunction (Symptom
Code B)" is not stored.
3 . E n g i n e s p e e d i s 0 r p m .
4. Doubled pump camshaft
speed is more than
50rpm.When pump camshaft speed
s e n s o r i s O K :
ECM uses doubled pump
camshaft speed as substitute
engine speed.
Other than pump camshaft
s p e e d s e n s o r i s O K :
Fuel injection quantity is
reduced.1. Engine speed is more
than 0rpm.
2. Doubled pump camshaft
speed is below 100rpm.During engine crank:
1. CKP sensor harness
open circuit, short to
ground or short to
voltage circuit.
2. Poor connector
c o n n e c t i o n .
3. CKP sensor malfunction.
4. Pulse sensing gap
i n c o r r e c t .
5 . P u l s e r m a l f u n c t i o n .
6. Electrical interference.
7. Magnetic interference.
8. ECM malfunction.9 0 /
9 8 /
101P1135 (A)
E ON Engine Speed Input Circuit
Range/PerformanceEngine speed is more than
5700rpm.When intermittent
malfunction:
1. MAB (fuel cutoff solenoid
v a l v e ) i s o p e r a t e d .
2. Desired injection quantity
b e c o m e s 0 m g / s t r k .
When preliminary
malfunction:
ECM uses doubled pump
camshaft speed as substitute
engine speed.Engine speed is below
5700rpm.1. Engine over-running.
2. CKP sensor malfunction.























3 . P u l s e r m a l f u n c t i o n .
4. ECM malfunction.
9 0 /
9 8 /
101—
66 P0380 4 ON Glow Relay Circuit Voltage
LowGlow relay circuit open or
short to ground circuit.No fail-safe function. Glow relay circuit is correct
condition.1. Glow relay circuit open or
short to ground circuit.
2. Glow relay malfunction.
3. ECM malfunction.94 —
8 ON Glow Relay Circuit Voltage
HighGlow relay circuit short to
voltage circuit.ECM malfunction.
—— Flash
CodeCodeSymptom
CodeMILDTC Name DTC Setting Condition Fail-Safe (Back Up) Recovery Condition Related Failure PartsRelated
ECM Pin
No.Related
Multiple
DTC4JA1-TC
(MT)4JH1-TC
(MT)4JH1-TC
(AT)