Isuzu N-Series. Service manual — part 902
Transmission Control System (Smoother) 7A-63
P0903
65
ON
Intermitten
tly ON
Clutch Actuator
Circuit High
Voltage
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The smoother main
relay is commanded
ON.
• The TCM detects a
high voltage condition
on the gearshift clutch
solenoid valve control
circuit when the
solenoid valve is
commanded OFF.
• Solenoid valve control
circuit is short to battery
or ignition voltage,
open circuit or high
resistance.
• Poor harness
connector connection.
• Faulty solenoid valve.
• Faulty TCM.
P0904
58
ON
OFF
Gate Select
Position Circuit
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The TCM detects that
the gear select position
sensor signal voltage is
less than 0.5 volts or
more than 4.5 volts.
• Sensor 5V reference
circuit is short to battery
or ignition voltage,
short to ground, short to
the low reference
circuit, open circuit or
high resistance.
• Sensor signal circuit is
short to battery or
ignition voltage, short to
any 5V reference
circuit, short to ground,
short to the low
reference circuit, open
circuit or high
resistance.
• Sensor low reference
circuit is open circuit or
high resistance.
• Poor harness
connector connection.
• Faulty sensor
installation condition.
• Faulty sensor.
• Faulty TCM.
P0906
52
ON
OFF
Selector Lever
Circuit
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
Either of following
condition is met:
• The TCM detects two
or more selector lever
N, D and R switch
signal is ON (pulled to
ground).
• The TCM detects two
or more selector lever
A, + and
− switch signal
is ON (pulled to ground)
when the selector lever
N, D or R switch signal
is ON (pulled to
ground).
• Switch signal circuit is
short to ground or short
each other.
• Faulty switch
installation condition.
• Faulty switch.
• Faulty selector lever.
• Faulty TCM.
P0907
51
OFF
OFF
Selector Lever
Circuit
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The TCM detects that
the selector lever N, D
and R switch signals
are OFF (open circuit)
at the same time.
• Switch signal circuit is
open circuit or high
resistance.
• Switch ground circuit is
open circuit or high
resistance.
• Poor harness
connector connection.
• Faulty switch
installation condition.
• Faulty switch.
• Faulty selector lever.
• Faulty TCM.
DTC
Flash
Code
W/L
Status
Buzzer
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
7A-64 Transmission Control System (Smoother)
P0909
76
ON
OFF
Gate Select
Control Error
• DTCs P0718,
P0889, P0902,
P0903, P0904,
P0912, P0913,
P0914, P0973,
P0974, P0976 and
P0977 are not set.
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The gearshift
control box relay is
commanded ON.
• The selector lever is
other than N
position.
• The TCM detects the
gear select side lever
position does not reach
to a desired select
position continuously
when shifting to desired
gear.
• Faulty gear select
position sensor.
• Faulty gear select
position sensor
installation condition.
• Faulty select solenoid
valve.
• Faulty select solenoid
valve installation
condition.
• Faulty gear select lever
shaft.
• Faulty gearshift control
box.
• Select lever stuck.
• Incorrect vehicle
information
programming
(transmission type).
P0912
75
ON
Intermitten
tly ON
Select Solenoid
Valve Circuit
High Voltage
• DTC P0889 is not
set.
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The gearshift
control box relay is
commanded ON.
• The TCM detects a
high voltage condition
on the select solenoid
valve monitor circuit
when the solenoid
valve is commanded
OFF.
• Solenoid valve voltage
feed circuit is open
circuit or high
resistance.
• Solenoid valve control
circuit is short to battery
or ignition voltage,
open circuit or high
resistance.
• Solenoid valve ground
circuit is open circuit or
high resistance.
• Poor harness
connector connection.
• Faulty solenoid valve.
• Faulty TCM.
P0913
75
ON
Intermitten
tly ON
Select Solenoid
Valve Circuit Low
Voltage
• DTC P0889 is not
set.
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The gearshift
control box relay is
commanded ON.
• The TCM detects a low
voltage condition on the
select solenoid valve
monitor circuit when the
solenoid valve is
commanded ON.
• Solenoid valve control
circuit is short to
ground.
• Faulty solenoid valve.
• Faulty TCM.
DTC
Flash
Code
W/L
Status
Buzzer
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
Transmission Control System (Smoother) 7A-65
P0914
57
ON
OFF
Gear Shift
Position Circuit
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The TCM detects that
the gear shift position
sensor signal voltage is
less than 0.5 volts or
more than 4.5 volts.
• Sensor 5V reference
circuit is short to battery
or ignition voltage,
short to ground, short to
the low reference
circuit, open circuit or
high resistance.
• Sensor signal circuit is
short to battery or
ignition voltage, short to
any 5V reference
circuit, short to ground,
short to the low
reference circuit, open
circuit or high
resistance.
• Sensor low reference
circuit is open circuit or
high resistance.
• Poor harness
connector connection.
• Faulty sensor
installation condition.
• Faulty sensor.
• Faulty TCM.
P0915
74
ON
OFF
Gear Shift
Position Control
Disengage Error
• DTCs P0718,
P0889, P0902,
P0903, P0904,
P0912, P0913,
P0914, P0973,
P0974, P0976 and
P0977 are not set.
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The gearshift
control box relay is
commanded ON.
• The selector lever is
other than N
position.
• The TCM detects the
gear shift side lever
position does not reach
to a desired shift
position and it keeping
a previously engaged
gear position
continuously when
shifting to desired gear.
This indicates that the
TCM detects gear stuck
at an engaged position.
• Faulty gear shift
position sensor.
• Faulty gear shift
position sensor
installation condition.
• Faulty 1-3-5 or 2-4-6-R
shift solenoid valve.
• Faulty 1-3-5- or 2-4-6-R
shift solenoid valve
installation condition.
• Faulty gear shift lever
shaft.
• Faulty gearshift control
box.
• Shift lever stuck.
• Faulty gearshift clutch
(stuck engage).
• Transmission stuck.
P0919
72
ON
OFF
Gear Shift
Position Engage
Error
• DTCs P0718,
P0889, P0902,
P0903, P0904,
P0912, P0913,
P0914, P0973,
P0974, P0976 and
P0977 are not set.
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The gearshift
control box relay is
commanded ON.
• The selector lever is
other than N
position.
• The TCM detects the
gear shift side lever
position does not reach
to a desired shift
position continuously
when shifting to desired
gear.
• Faulty gear shift
position sensor.
• Faulty gear shift
position sensor
installation condition.
• Faulty 1-3-5 or 2-4-6-R
shift solenoid valve.
• Faulty 1-3-5- or 2-4-6-R
shift solenoid valve
installation condition.
• Faulty gear shift lever
shaft.
• Faulty gearshift control
box.
• Shift lever stuck.
• Faulty gearshift clutch
(stuck engage).
• Transmission stuck.
DTC
Flash
Code
W/L
Status
Buzzer
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
7A-66 Transmission Control System (Smoother)
P0973
71
ON
Intermitten
tly ON
2-4-6-R Shift
Solenoid Valve
Circuit High
Voltage
• DTC P0889 is not
set.
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The gearshift
control box relay is
commanded ON.
• The TCM detects a
high voltage condition
on the 2-4-6-R shift
solenoid valve monitor
circuit when the
solenoid valve is
commanded OFF.
• Solenoid valve voltage
feed circuit is open
circuit or high
resistance.
• Solenoid valve control
circuit is open circuit or
high resistance.
• Solenoid valve ground
circuit is open circuit or
high resistance.
• Poor harness
connector connection.
• Faulty solenoid valve.
• Faulty TCM.
P0974
71
ON
Intermitten
tly ON
2-4-6-R Shift
Solenoid Valve
Circuit Low
Voltage
• DTC P0889 is not
set.
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The gearshift
control box relay is
commanded ON.
• The TCM detects a low
voltage condition on the
2-4-6-R shift solenoid
valve monitor circuit
when the solenoid
valve is commanded
ON.
• Solenoid valve control
circuit is short to
ground.
• Faulty solenoid valve.
• Faulty TCM.
P0976
73
ON
Intermitten
tly ON
1-3-5 Shift
Solenoid Valve
Circuit High
Voltage
• DTC P0889 is not
set.
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The gearshift
control box relay is
commanded ON.
• The TCM detects a
high voltage condition
on the 1-3-5 shift
solenoid valve monitor
circuit when the
solenoid valve is
commanded OFF.
• Solenoid valve voltage
feed circuit is open
circuit or high
resistance.
• Solenoid valve control
circuit is short to battery
or ignition voltage,
open circuit or high
resistance.
• Solenoid valve ground
circuit is open circuit or
high resistance.
• Poor harness
connector connection.
• Faulty solenoid valve.
• Faulty TCM.
P0977
73
ON
Intermitten
tly ON
1-3-5 Shift
Solenoid Valve
Circuit Low
Voltage
• DTC P0889 is not
set.
• The ignition switch
is ON.
• The ignition voltage
is more than 20
volts.
• The emergency
switch is OFF.
• The gearshift
control box relay is
commanded ON.
• The TCM detects a low
voltage condition on the
1-3-5 shift solenoid
valve monitor circuit
when the solenoid
valve is commanded
ON.
• Solenoid valve control
circuit is short to
ground.
• Faulty solenoid valve.
• Faulty TCM.
DTC
Flash
Code
W/L
Status
Buzzer
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
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