ISUZU TF SERIES 2004 Workshop Manual

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)

6E–120 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
67 P0381 4 ON Glow Plug Indicator Circuit
Voltage LowGlow plug indicator circuit
open or short to ground
circuit.No fail-safe function. Glow plug indicator circuit is
correct condition.1. Glow plug indicator
circuit open or short to
g r o u n d c i r c u i t .
2. Glow plug indicator lamp
m a l f u n c t i o n .
3. ECM malfunction.43 —
8 ON Glow Plug Indicator Circuit
Voltage HighGlow plug indicator circuit
short to voltage circuit.ECM malfunction.
——
32 P0400 3 ON Exhaust Gas Recirculation
Flow Excessive Detected1. Intake air temperature is
between 15 deg. C and
1 0 0 d e g . C .
2. Engine coolant
temperature is between
55 deg. C and 100 deg.
C (4JA1-TC) or 35 deg. C
and 100 deg. C (4JH1-
T C ) .
3. Barometric pressure is
between 850hpa and
1 1 0 0 h p a .
4. Small amount of mass air
flow. (Desired mass air
flow - mass air flow is
more than 150mg/strk)Fuel injection quantity is
reduced. 1. Engine speed is between
1500rpm and 3100rpm
(4JA1-TC) or 1500rpm
and 3200rpm (4JH1-TC).



















2. Injection quantity is
below 32mg/strk (4JA1-
TC) or 40mg/stk (4JH1-
T C ) .
3. Correct amount of mass
air flow.1. EGR valve is stuck at
o p e n p o s i t i o n .
2. EGR EVRV malfunction.
3 . A i r i n t a k e i s o b s t r u c t e d .
4. Air intake is leaking.
5. MAF sensor malfunction.
6. ECM malfunction.
8 8 /
97—
4 ON Exhaust Gas Recirculation
Circuit Short to Ground or
Open CircuitEGR EVRV circuit open or
short to ground circuit.Fuel injection quantity is
reduced and EGR EVRV
10% conditions as substitute.EGR EVRV circuit is correct
condition.1. EGR EVRV circuit open
or short to ground circuit.
2. EGR EVRV malfunction.
3. ECM malfunction.97 —
5 ON Exhaust Gas Recirculation
Flow Insufficient Detected1. Intake air temperature is
between 15 deg. C and
100 deg. C.
2. Engine coolant
temperature is between
55 deg. C and 100 deg.
C (4JA1-TC) or 35 deg. C
and 100 deg. C (4JH1-
T C ) .
3. Barometric pressure is
between 850hpa and
1 1 0 0 h p a .
4. Large mount of mass air
flow. (Desired mass air
flow - mass air flow is
below -150 mg/strk)Fuel injection quantity is
reduced. 1. Engine speed is between
1500rpm and 3100rpm
(4JA1-TC) or 1500rpm
and 3200rpm (4JH1-TC).



















2. Injection quantity is
below 32mg/strk (4JA1-
TC) or 40mg/stk (4JH1-
T C ) .
3. Correct amount of mass
air flow.1. EGR valve is stuck at
c l o s e p o s i t i o n .
2. EGR valve operating
vacuum hose is clogged
or disconnected.
3. EGR EVRV malfunction.


4. MAF sensor signal circuit
short to voltage circuit.
5. MAF sensor malfunction.
6. ECM malfunction.8 8 /
97—
8 ON Exhaust Gas Recirculation
Circuit Short to BatteryEGR EVRV circuit short to
voltage circuit.Fuel injection quantity is
reduced & EGR EVRV 10%
conditions as substitute.EGR EVRV circuit is correct
condition.1. EGR EVRV circuit short
t o v o l t a g e c i r c u i t .
2. EGR EVRV malfunction.
3. ECM malfunction.97 — 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–121
24 P0500 1 ON
at
next
igniti
on
cycleVehicle Speed Sensor Circuit
High InputVehicle speed is more than
200km/h.ECM uses vehicle speed
5km/h condition as
substitute.Vehicle speed is below
200km/h.1. VSS signal circuit open,
short to ground or short
t o v o l t a g e c i r c u i t .
2. VSS malfunction.
3. Speed meter
m a l f u n c t i o n .
4. TCM malfunction (AT
2 W D ) .
5. ECM malfunction.68 —
A O N
at
next
igniti
on
cycleVehicle Speed Sensor Input
Signal Frequency Too HighInput signal frequency is too
high.ECM uses vehicle speed
5km/h condition as
substitute.Correct vehicle speed signal
frequency. 1. VSS malfunction.
2. Speed meter
m a l f u n c t i o n .
3. Electrical interference.
4. Magnetic interference.
5. ECM malfunction.68 —
B O N
at
next
igniti
on
cycleVehicle Speed Sensor
Incorrect Signal1. Engine speed is more
than 3200rpm (4JA1-TC)
or 3600rpm (4JH1-TC).
2. Fuel injection quantity is
more than 30mg/strk
(4JA1-TC) or 41mg/strk
( 4 J H 1 - T C ) .
3. Vehicle speed is below
1.5km/h.Fuel injection quantity is
reduced.Vehicle speed is more than
1.5km/h.1. VSS open circuit, short
to ground or short to
voltage.
2. Poor connector
c o n n e c t i o n .
3. VSS malfunction.
4. Speed meter
m a l f u n c t i o n .
5. ECM malfunction.68 —
35 P0560 1 OFF System Voltage Too High System voltage is more than
20V.ECM uses 9V conditions as
substitute.System voltage is below 20V. 1. Charge system
m a l f u n c t i o n .
2. Battery jump start cable
misconnect.
3. ECM malfunction.3 /
39—
2 OFF System Voltage Too Low System voltage is below 7V. System voltage is more than
7V.1. Battery power feed
harness open circuit or
short to ground circuit.
2. ECM ground harness
open or poor connection.
3. Poor connector
c o n n e c t i o n .
4 . B a t t e r y m a l f u n c t i o n .
5. Charge system
m a l f u n c t i o n .
6. ECM malfunction.3 /
39— 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–122 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
35 P0560 A OFF System Voltage Malfunction System voltage of PSG
(pump control unit) is below
4.5V or more than 27V.PSG uses default voltage as
substitute.System voltage of PSG is
between 4.5V and 27V.1. Battery power feed
harness open circuit or
short to ground circuit.
2. PSG (pump control unit)
ground harness open or
p o o r c o n n e c t i o n .
3. Poor connector
c o n n e c t i o n .
4 . B a t t e r y m a l f u n c t i o n .
5. Charge system
m a l f u n c t i o n .
6. Battery jump start cable
misconnect.
7. PSG (pump control unit)
malfunction.——
18 P0561 A OFF Ignition Switch Circuit
MalfunctionThe ECM recognized ignition
switch turn off signal during
ECM is activated.ECM stops engine. No recovery until condition
match in the next ignition key
cycle.1. Ignition switch circuit
open or short to ground
c i r c u i t .
2. Poor connector
c o n n e c t i o n .
3. Ignition switch
m a l f u n c t i o n .
4. ECM malfunction.39 —
B OFF Ignition Switch Circuit
MalfunctionIgnition switch circuit is
malfunction.1. Ignition switch circuit
open or short to ground
c i r c u i t .
2. Poor connector
c o n n e c t i o n .
3. Ignition switch
m a l f u n c t i o n .
4. ECM malfunction.39 —
- P0602 - Control Module
Programming ErrorECM memory area error. Engine control disabled. Memory are is OK. ECM is not programmed.
——
28 P0606 A ON ECU Malfunction Gate Array communication
error.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. ECM malfunction.
——
B ON ECU Malfunction 1. Throttle position is below
1 % .
2. Desired injection quantity
is more than 0mg/strk.
3. Engine speed is more
t h a n 2 0 0 0 r p m . MAB (fuel cutoff solenoid
v a l v e ) i s o p e r a t e d . Desired injection quantity is
b e l o w 0 m g / s t r k . 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)

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–123
46 P0645 4 ON A/C Compressor Relay
Circuit Voltage LowA/C compressor relay circuit
open or short to ground
circuit.No fail-safe function. A/C compressor relay circuit
is correct condition.1. A/C compressor relay
circuit open or short to
g r o u n d c i r c u i t .
2. Poor connector
c o n n e c t i o n .
3. A/C compressor relay
m a l f u n c t i o n .
4. ECM malfunction.41 —
8 ON A/C Compressor Relay
Circuit Voltage High A/C compressor relay circuit
short to voltage circuit.ECM malfunction.
——
25 P0703 A ON Brake Switch Circuit
Malfunction1. Throttle position is more
t h a n 0 % .
2. Engine speed is more
than 693rpm (4JA1-TC)
or 665rpm (4JH1-TC).
3. Vehicle speed is more
t h a n 0 k m / h .
4. Brake switch 1 signal and
brake switch 2 signal are
differently inputted to the
ECM since the ignition
switch was turned on.No fail-safe function. Brake switch 1 signal and
brake switch 2 signal are
correctly inputted to the
ECM.1. Brake switch 1 circuit
open, short to ground or
short to voltage circuit.
2. Poor connector
c o n n e c t i o n .
3. Brake switch 1
m a l f u n c t i o n .
4. ECM malfunction.30 —
B ON Brake Switch Circuit
Malfunction1. Throttle position is more
t h a n 0 % .
2. Engine speed is more
than 693rpm (4JA1-TC)
or 665rpm (4JH1-TC).
3. Vehicle speed is more
t h a n 0 k m / h .
4. Brake switch 1 signal and
brake switch 2 signal are
differently inputted to the
ECM.1. Brake switch 2 circuit
open or short to ground
c i r c u i t .
2. Poor connector
c o n n e c t i o n .
3. Brake switch 2
m a l f u n c t i o n .
4. ECM malfunction.65 —
57 P0704 6 ON Clutch Switch Input Circuit
MalfunctionClutch signal does not
change between vehicle
speed 1.5km/h and 80km/h
since ignition switch was
tuned on. No fail-safe function. Clutch signal correctly
changes.1. Clutch switch circuit
open, short to ground or
short to voltage circuit.
2. Poor connector
c o n n e c t i o n .
3. Clutch switch
m a l f u n c t i o n .
4. ECM malfunction.31 — —
86 P1105 1 ON Barometric Pressure Sensor
Circuit High InputBarometric pressure sensor
output voltage is more than
4.4V.ECM uses 1013hpa
condition as substitute.Barometric pressure sensor
output voltage is below 4.4V.ECM malfunction.
——
2 ON Barometric Pressure Sensor
Circuit Low InputBarometric pressure sensor
output voltage is below 1.5V.Barometric pressure sensor
output voltage is more than
1.5V.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–124 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
21 P1120 1 ON Pedal/Throttle Position
Sensor Circuit High InputThrottle position sensor
output voltage is more than
4.5V.ECM increases idle speed up
to 1400rpm.Throttle position sensor
output voltage is below 4.5V.1. Sensor power supply
circuit short to voltage
c i r c u i t .
2. Sensor signal circuit
short to voltage circuit.
3. Sensor ground circuit
open or short to voltage
c i r c u i t .
4. Poor connector
c o n n e c t i o n .
5 . T P S m a l f u n c t i o n .
6. ECM malfunction.3 8 /
4 9 /
57—
7 ON Pedal/Throttle Position
Sensor Voltage Supply
Circuit High InputThrottle position sensor
power supply voltage is more
than 5.2V.Throttle position sensor
power supply voltage is
below 5.2V.1. Sensor power supply
circuit short to battery
voltage circuit.
2 . T P S m a l f u n c t i o n .
3. ECM malfunction.57 —
9 ON Pedal/Throttle Position
Sensor Voltage Supply
Circuit Low InputThrottle position sensor
power supply voltage is
below 4.6V.Throttle position 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 . T P S m a l f u n c t i o n .
3. ECM malfunction.57 —
D ON Pedal/Throttle Position
Sensor Brake Switch Error1. Engine speed is more
t h a n 1 7 0 0 r p m .
2. Vehicle speed is more
t h a n 1 . 5 k m / h .
3. When brake pedal is
depressed during
accelerator pedal is
d e p r e s s i n g . Throttle position is more than
20% or brake pedal is
released (switch is inactive). 1 . T h r o t t l e s t i c k i n g .
2. TPS incorrect adjusting.
3 . T P S m a l f u n c t i o n .
4. Brake switch
m a l f u n c t i o n .
5. ECM malfunction.3 0 /
3 8 /
65—
E ON Pedal/Throttle Position
Sensor Idle Position Switch
Error1. When idle switch is
turned off, throttle
position sensor was
b e l o w 0 . 3 5 % .
o r
2. When idle switch is tuned
on, throttle position
sensor was more than
7.8%.1. When throttle position
sensor is 100%, idle
s w i t c h t u r n s o f f .
2. When throttle position
sensor is 0%, idle switch
turns on.1 . T P S m a l f u n c t i o n .
2. Idle switch malfunction.
3. ECM malfunction.
3 8 /
69—
22 P1173 3 OFF Fuel Reduction Caused By
High Coolant TemperatureExcessive high engine
coolant temperature is
detected.No fail-safe function. Engine coolant temperature
is normal range.1 . E n g i n e o v e r h e a t .
2. ECT sensor malfunction.








3. ECM malfunction.89 —
7 OFF Fuel Reduction Caused By
High Fuel TemperatureFuel temperature is more
than 100 deg. C.PSG (pump control unit)
controls fuel injection
quantity based on engine
speed and fuel temperature.Fuel temperature is below
100 deg. C.1 . E C M m a l f u n c t i o n .
2. PSG (pump control unit)
malfunction.——
A OFF Fuel Reduction Caused By
Low Fuel TemperatureExcessive low fuel
temperature is detected.No fail-safe function. Fuel temperature is normal
range.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)

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–125
43 P1335 A ON Engine Speed Output Circuit
MalfunctionThe PSG (pump control unit)
is recognized defective
engine speed signal form the
ECM.Fuel injection quantity is
reduced.Correct engine speed signal. 1. CKP sensor harness
open circuit, short to
ground or short to
voltage.
2. CKP sensor output
harness open circuit,
short to ground or short
t o v o l t a g e .
3. Poor connector
c o n n e c t i o n .
4. CKP sensor malfunction.
5. Pulse sensing gap
i n c o r r e c t .
6 . P u l s e r m a l f u n c t i o n .
7. Electrical interference.
8. Magnetic interference.
9. ECM malfunction.
10. PSG (pump control unit)
malfunction.9 0 /
9 1 /
9 8 /
101P0335(B)/











P0335(D)
45 P1345 A ON Camshaft Speed Malfunction The PSG (pump control unit)
is recognized incorrect
camshaft speed signal.No fail-safe function. Correct camshaft speed. 1. Pump camshaft speed
s e n s o r m a l f u n c t i o n .
2. Pulse sensing gap
i n c o r r e c t .
3 . P u l s e r m a l f u n c t i o n .
4. Electrical interference.
5. Magnetic interference.
6. ECM malfunction.
7. PSG (pump control unit)
malfunction.——
47 P1520 A ON Neutral Switch ON Error Neutral switch signal is
inputted "On" three times
consecutively under driving
conditions.No fail-safe function. Correct neutral switch signal
is inputted two times
consecutively under driving
conditions.1. Neutral switch circuit
short to voltage circuit.
2. Neutral switch
m a l f u n c t i o n .
3. ECM malfunction.87 —
B ON Neutral Switch OFF Error Neutral switch signal is
inputted "Off" three times
consecutively under driving
conditions.1. Neutral switch circuit
open, short to ground
c i r c u i t .
2. Poor connector
c o n n e c t i o n .
3. Neutral switch
m a l f u n c t i o n .
4. ECM malfunction.87 — —
55 P1605 C ON Seed and Key File Destroyed Seed or key file in EEPROM
is destroyed.No fail-safe function. No recovery. ECM malfunction.
——
D ON EEPROM Defect Write and read from the
EEPROM are failed during
initialization of the ECM.ECM uses default values
from the EPROM.Write and read from the
EEPROM are correct during
initialization of the ECM.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–126 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
55 P1605 E ON EEPROM Defect EEPROM checksum does
not match with the read
check sum during
initialization of the ECM.EEPROM checksum match
with the read check sum
during initialization of the
ECM.ECM malfunction.
——
56 P1610 A - Security Key and Security
Code not ProgrammedImmobilizer functions are not
programmed in the ECM.1 . E n g i n e d o e s n o t s t a r t .
2. Check engine lamp flash. No recovery. ECM malfunction.
— B****
56 P1611 A - Wrong Security Code
EnteredReceived security code is not
correct.1 . E n g i n e d o e s n o t s t a r t .
2. Check engine lamp flash. N o r e c o v e r y . 1 . E C M m a l f u n c t i o n .
2. Immobilizer control unit
m a l f u n c t i o n .
3. Transponder key
malfunction.— B****
56 P1612 A - Immobilizer No or Wrong
SignalReceived challenge signal is
not correct or not received.1 . E n g i n e d o e s n o t s t a r t .
2. Check engine lamp flash. No recovery. 1. ECM and immobilizer
control unit
communication circuit
open circuit, short to
ground circuit or short to
voltage circuit.
2 . E C M m a l f u n c t i o n .
3. Immobilizer control unit
m a l f u n c t i o n .
4. Transponder key
malfunction.2 7 /
35B****
56 P1613 A - Immobilizer No or Wrong
SignalReceived response signal is
not correct or not received.1 . E n g i n e d o e s n o t s t a r t .
2. Check engine lamp flash. No recovery. 1. ECM and immobilizer
control unit
communication circuit
open circuit, short to
ground circuit or short to
voltage circuit.
2 . E C M m a l f u n c t i o n .
3. Immobilizer control unit
m a l f u n c t i o n .
4. Transponder key
malfunction.2 7 /
35B****
56 P1614 A - Wrong Transponder Key Received response signal is
not correct from the
transponder key.1 . E n g i n e d o e s n o t s t a r t .
2. Check engine lamp flash. N o r e c o v e r y . 1 . E C M m a l f u n c t i o n .
2. Immobilizer control unit
m a l f u n c t i o n .
3. Transponder key
malfunction.— B****
76 P1625 A OFF ECM Main Relay Switched
Off Too EarlyWhen ignition switch was
turned off, timing of the ECM
main relay turning off is too
early.No fail-safe function. No recovery. ECM malfunction.
3 /
58—
B OFF ECM Main Relay Switched
Off Too LateWhen ignition switch was
turned off, timing of the ECM
main relay turning off is too
late or does not off.No recovery. 1. ECM main relay
m a l f u n c t i o n .
2. ECM malfunction.3 /
58— 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–127
51 P1630 A ON Fuel Injection Quantity
Circuit MalfunctionThe PSG (pump control unit)
detects high pressure
solenoid valve control circuit
malfunction due to high
current.Fuel injection quantity is
reduced.The PSG (pump control unit)
detects correct high pressure
solenoid valve control circuit.PSG (pump control unit)
malfunction.
——
B ON Fuel Injection Quantity
Circuit MalfunctionThe PSG (pump control unit)
detects high pressure
solenoid valve control circuit
malfunction due to
continuous current.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. PSG (pump control unit)
malfunction.
——
44 P1650 A ON CAN Device Offline CAN controller detects Bus-
off or canceling.MAB (fuel cutoff solenoid
v a l v e ) i s o p e r a t e d . CAN controller detects
correct Bus signal.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. Poor connector
c o n n e c t i o n .
4. Electrical interference.
5. ECM malfunction.
6. PSG (pump control unit)
malfunction.9 9 /
100P1651(B)
B ON CAN Device Hang-up CAN controller does not
react under engine running.CAN controller reacts
correctly under engine
running.1 . E C M m a l f u n c t i o n .
2. PSG (pump control unit)
malfunction.——
45 P1651 A ON CAN Malfunction The PSG (pump control unit)
does not recognize CAN
signal from the CAN
controller.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.The PSG (pump control unit)
recognizes CAN signal from
the CAN controller.1 . E C M m a l f u n c t i o n .
2. PSG (pump control unit)
malfunction.——
B ON CAN Malfunction The ECM does not read CAN
signal from the PSG (pump
control unit).The ECM reads CAN signal
from the PSG (pump control
unit).1. CAN high circuit open,
short to ground or short
to voltage circuit.
2. CAN low circuit open,
short to ground or short
to voltage circuit.
3. Poor connector
connection.
4. Electrical interference.
5. ECM malfunction.
6. PSG (pump control unit)
malfunction.9 9 /
100P1650(A)
77 P1690 4 OFF Check Engine Lamp (MIL)
Circuit Voltage LowCheck engine lamp circuit
open or short to ground
circuit.No fail-safe function. Check engine lamp circuit is
correct condition.1. Check engine lamp
circuit open or short to
g r o u n d c i r c u i t .
2. Check engine lamp
malfunction
3. ECM malfunction.42 B****
8 OFF Check Engine Lamp (MIL)
Circuit Voltage HighCheck engine lamp 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)

6E–128 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) P0100 (SYMPTOM CODE 7)
(FLASH CODE 65) MASS AIR FLOW (MAF) SENSOR VOLTAGE SUPPLY
CIRCUIT HIGH INPUT
DIAGNOSTIC TROUBLE CODE (DTC) P0100 (SYMPTOM CODE 9)
(FLASH CODE 65) MASS AIR FLOW (MAF) SENSOR VOLTAGE SUPPLY
CIRCUIT LOW INPUT
DIAGNOSTIC TROUBLE CODE (DTC) P0100 (SYMPTOM CODE B)
(FLASH CODE 65) MASS AIR FLOW (MAF) SENSOR OUTPUT CIRCUIT LOW
INPUT
DIAGNOSTIC TROUBLE CODE (DTC) P0100 (SYMPTOM CODE C)
(FLASH CODE 65) MASS AIR FLOW (MAF) SENSOR OUTPUT CIRCUIT HIGH
INPUT