Isuzu N-Series. Manual - part 902

 

  Index      Isuzu     Isuzu N-Series - service repair manual

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  900  901  902  903   ..

 

 

Isuzu N-Series. 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

 

 

 

 

 

 

 

Content   ..  900  901  902  903   ..