2007 ISUZU KB P190 FLASH CODE

7A2-90 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

DTC P0962 or P0963 (Flash Code 35)




RTW 77ALF001501

Circuit Description
The pressure control solenoid is a PW M duty control
solenoid located in the valve body.
The pressure control solenoid is a TCM-controled
device used to regulate transmission throttle pressure
by energizing current from the TCM.
Condition For Running The DTC
All of the following conditions are met.
(1) All of the following conditions are met for 2 seconds or more continuously.
• The supply voltage is more than 10.2 volts and
less than 15.5 volts.
(2) Not emergency mode.
(3) All of the following conditions are met. • Device Control is not operating.
• Disable Normal Communication Service is
receiving enable.
• DTC Clear is not operating.
Condition For Setting The DTC
(1) All of the following conditions are met for 12.5
seconds or more continuously. (DTC P0962)
• 1 second or more passed after ignition short
failure detection condition is met or ignition short
failure is never detected after ignition “ON”.

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-93

DTC P0973 or P0974 (Flash Code 31)




RTW 77ALF001501

Circuit Description
The shift solenoid S1 changes the hydraulic route with
the signals from the TCM according to the vehicle
speed and the throttle opening to control shifting. W hen
the shift solenoid S1 or S2 fails, the hydraulic circuit is
mechanically operated as a backup.
Condition For Running The DTC
All of the following conditions are met.
(1)
All of the following conditions are met for 2
seconds or more continuously.
• The supply voltage is more than 10.2 volts and
less than 15.5 volts.
(2) Not emergency mode.
(3) 0.025 seconds or more passed after the state o
f
power “ON” solenoid is changed.
(4) All of the following conditions are met. • Device Control is not operating.
• Disable Normal Communication is receiving
enable.
• DTC Clear is not operating.


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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-97

DTC P0976 or P0977 (Flash Code 32)




RTW 77ALF001501

Circuit Description
The shift solenoid S2 changes the hydraulic route with
the signals from the TCM according to the vehicle
speed and the throttle opening to control shifting. W hen
the shift solenoid S1 or S2 fails, the hydraulic circuit is
mechanically operated as a backup.
Condition For Running The DTC
All of the following conditions are met.
(1) All of the following conditions are met for 2 seconds or more continuously.
• The supply voltage is more than 10.2 volts and
less than 15.5 volts.
(2) Not emergency mode.
(3) 0.025 seconds or more passed after the state o
f
power “ON” solenoid is changed.
(4) All of the following conditions are met. • Device Control is not operating.
• Disable Normal Communication is receiving
enable.
• DTC Clear is not operating.



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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-101

DTC P1790 (Flash Code 61)
Description
The electrically erasable programable read only
memory (EEPROM) is a permanent memory chip that is
physically solenoid within the TCM. The EEPROM
contans the program and the calibration information that
the TCM needs to control powertrain operation.
Unlike the PROM used in past applications, the
EEPROM is not replaceable. If the TCM is replaced, the
new TCM will need to be programmed. Equipment
containing the correct program and calibration for the
vehicle is required to program the TCM.
Condition For Running The DTC
ROM check sum calculation is completed.
Condition For Setting The DTC
Following condition is met twice since ignition “ON”.
• ROM check sum calculation result/check sum value saved in ROM.
Action Taken When The DTC Sets
• Change to emergency mode.
• Check Trans “ON”.
• DTC stored.
• MIL request “ON”. (EURO 4 only)
Conditions For Clearing The DTC
• The DTC can be cleared from the TCM history by
using a scan tool.
• The DTC will be cleared from history when the
vehicle has achieved 40 warm-up cycles without a
failure reported.
•
After more than 1 second has elapsed after the
ignition key has been turned “ON”, short between
No.11 and No.5 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.
Diagnostic Aids
• Inspect the wiring for poor electrical connection at the
TCM. Look for possible bent, backed out, deformed
or damaged terminals. Check for weak terminal
tension as well. Also check for a chafed wire that
could short to bare metal or other wiring. Inspect for a
broken wire inside the insulation.
• W hen diagnosing for a possible intermittent short o
r
open condition, move the wiring harness while
observing test equipment for a change.


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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-103

DTC P1791 (Flash Code 62)
Description
DTC P1791 is recorded by TCM when there is
malfunction in the RAM.
Condition For Running The DTC
Execute only one time after ignition “ON”.
Condition For Setting The DTC
One of the following conditions are met two times
continuously.
• W rite Ox5a5a5a5a into RAM, and read value is not
same as Ox5a5a5a5a.
• W rite Oxa5a5a5a5 into RAM, and read value is not
same as Oxa5a5a5a5.
Action Taken The DTC Sets
• Check Trans “ON”.
• DTC stored.
• MIL request “ON”. (EURO 4 only)
Conditions For Clearing The DTC
• The DTC can be cleared from the TCM history by
using a scan tool.
• The DTC will be cleared from history when the vehicle has achieved 40 warm-up cycles without a
failure reported.
•
After more than 1 second has elapsed after the
ignition key has been turned “ON”, short between
No.11 and No.4 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.
Diagnostic Aids
• Inspect the wiring for poor electrical connection at the
TCM. Look for possible bent, backed out, deformed
or damaged terminals. Check for weak terminal
tension as well. Also check for a chafed wire that
could short to bare metal or other wiring. Inspect for a
broken wire inside the insulation.
• W hen diagnosing for a possible intermittent short o
r
open condition, move the wiring harness while
observing test equipment for a change.



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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-105

DTC P2769 or P2770 (Flash Code 33)




RTW 77ALF001501

Circuit Description
The lock-up solenoid SL of the torque converter clutch
(TCC) controls the lock-up clutch by a signal according
to the lock-up position judgment of the TCM when the
vehicle runs.
This function can improve the fuel consumption to
almost the same extent as the manual transmission.
The lock-up solenoid SL is put into B+ by the TCM, so
that the solenoid is actuated with the result of lock-up.

Condition For Running The DTC
All of the following conditions are met.
(1) All of the following conditions are met for 2 seconds or more continuously.
• The supply voltage is more than 10.2 volts and
less than 15.5 volts.
(2) Not emergency mode.
(3) 0.025 seconds or more passed after the state o
f
energized solenoid is changed.


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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-109

DTC P2773 or 2774 (Flash Code 75)





RTW 77AMF000901

Condition For Running The DTC
All of the following conditions are met.
(1)
All of the following conditions are met for 2
seconds or more continuously.
• The supply voltage is more than 10.2 volts and less than 15.5 volts.
• DTC U2104 is not detecting failure or not deciding failure.
• DTC U2105 is not detecting failure or not deciding failure.
• Engine revolution signal is not detecting failure or not deciding.
• The engine revolution is more than 550 rpm.
(2) Not emergency mode.
(3) D, 3, 2, L position point is “ON”.
(4) Shift position signal is not detecting failure or not deciding failure.
(5) The vehicle speed is more than 29 km/h (18 mph) and less than 160 km/h (100 mph).
(6) Speed meter signal is detecting failure or not deciding failure.
(7) Output revolution rpm is more than 1500 rpm.
(8) Output revolution sensor is not detecting failure o
r
not deciding failure.
(9) Throttle opening more than 2%.

(10) Throttle opening signal is not detecting failure o
r
note deciding failure.
(11) All of the following conditions are met.
• Device Control is not operating.
• Disable Normal Communication is receiving enable.
• DTC Clear is not operating.
Condition For Setting The DTC
All of the following conditions are met for 10 seconds
continuously. (DTC P2773)
• Transfer 4L switch is “ON”.
• Transfer High judgment by transfer real gear ratio 0.9 < T/F Hi gear ratio < 1.1
All of the following conditions are met for 10 seconds
continuously. (DTC P2774)
• Transfer 4L switch is “OFF”.
• Transfer Low judgment by transfer real gear ratio 2.23 < T/F Low gear ratio < 2.73
Action Taken When The DTC Sets
• No shift solenoid functional failure detection.
• No L-up solenoid functional failure detection.
• MIL request “ON”.
• Check Trans “ON”.
• DTC stored.
• MIL request “ON”. (EURO 4 only)

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ISUZU KB P190 2007

7A2-112 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

DTC U2104 (Flash Code 65)




RTW 77AMF000801

Circuit Description
The automatic transmission control system in AW 30-
40LE uses high speed CAN bus system. The individual
CAN bus systems are connected via two interfaces and
can exchange information and data. This allows control
modules that are connected to different CAN bus
systems to communicate. Transmission control module
in the vehicle that requires continuous, rapid
communication is connected to the high speed CAN
bus. The automatic transmission is continuously notified
of the current engine load status. Since the automatic
transmission control module has to react immediately to
load status changes, rapid communication is required
between the engine control module and the automatic
transmission control module. The high speed CAN bus
in the AW 30-40LE is designed as a two-wire CAN bus
(twisted pair). The wires are shielded and twisted. The
transmission rate is 500K band.

Condition For Running The DTC
All of the following conditions are met.
(1) All of the following conditions are met. • The following condition is met for 2 seconds o
r
more continuously.
- The supply voltage is more than 10.2 volts and less than 15.5 volts.
• One of the following conditions is met once afte
r
ignition “ON”.
- Output revolution sensor is not detecting failure or not deciding failure.
Output revolution is more than 550rpm
- Input revolution sensor is not detecting failure or not deciding failure.
Input revolution is more than 550rpm
- DTC U2104 is not detecting failure or not deciding failure.
DTC U2105 is not detecting failure or not
deciding failure.
Engine revolution signal is not detecting
failure or not deciding failure.
The engine revolution is more than 550rpm.

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ISUZU KB P190 2007