2007 ISUZU KB P190 DTC CHECK

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-99

Step Action Value(s) YES NO
4 1. Turn “OFF” the ignition.
2. Disconnect the TCM connector (C-94).
3. Turn “ON” the ignition.
4. Measure the voltage between terminal C94-15 and
terminal C94-1 by 5-8840-0285-0 DMM.

Is the voltage specified value? 8
∼16V Go to Step 7 Go to Step 10
5 1. Turn “OFF” the ignition.
2. Measure the resistance between terminal C94-15
and body ground by 5-8840-0285-0 DMM.

Is the resistance specified value? 11
∼15 Ω Go to Step 9 Go to Step 6
6 1. Disconnect the automatic transmission connector
(E-54).
2. Measure the resistance between terminal E54-8
and body ground by 5-8840-0285-0 DMM.

Is the resistance specified value? 11
∼15 Ω Go to Step 7 Go to Step 8
7 1. Check for open or short in the wire between
terminal C94-15 and terminal E54-8.
2. Repair or replace the wire between terminal C94-
15 and terminal E54-8.

Is the action complete? — Go to
Step 11 —
8 Replace the S2 solenoid.

Is the action complete? — Go to
Step 11 —
9 1. Clear the DTC.
2. Perform the test-driving.
3. Check the DTC.

W as DTC P0976 or P0977 stored? — Go to
Step 10 Refer to
Diagnostic Aids
10 Replace the TCM.
Important: The replacement TCM must be
programmed (Refer to SPS for procedure).

Is the action complete? — Go to
Step 11 —

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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

7A2-102 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

Circuit/System Testing DTC P1790

Step Action Value(s) YES NO
1
W as the On-Board Diagnostic (OBD) System Check
performed? — Go to
Step 2 Go to OBD
System Check
2 1. Install a scan tool.
2. Turn “OFF” the ignition and keep the position for
more than 30 seconds.
3. Turn “ON” the ignition.
4. Check the DTC on a scan tool.

Does a scan tool indicate DTC P1791? — Go to
Step 3 Refer to
Diagnostic Aids
3 Perform the SPS for the TCM.
Is the action complete? — Go to
Step 4 —
4 Recheck the DTC on the scan tool.

Does the scan tool indicate DTC P1790? — Go to
Step 5 Go to Step 6
5 Replace the TCM.
Important: The replacement TCM must be
programmed (Refer to SPS for procedure).

Is the action complete? — Go to
Step 6 —
6 1. Reconnect all previously disconnected harness
connector(s).
2. Clear the DTCs with a scan tool.
3. Turn “OFF” the ignition.
4. Start the engine.
5. Operate the vehicle within the Conditions For Running the DTC. You may also operate the
vehicle within the conditions that you observed
from the Freeze Frame/ Failure Records.

Did the DTC fail this ignition? —
Go to Step 2 Go to Step 7
7 Observe the stored information, Capture info with a
scan tool.

Are there any DTCs that you have not diagnosed? —
Go to
Diagnostic
Trouble Code (DTC) List Verify repair


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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

7A2-104 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

Circuit/System Testing DTC P1791

Step Action Value(s) YES NO
1
W as the On-Board Diagnostic (OBD) System Check
performed? — Go to
Step 2 Go to OBD
System Check
2 1. Install a scan tool.
2. Turn “OFF” the ignition and keep the position for
more than 30 seconds.
3. Turn “ON” the ignition.
4. Check the DTC on the scan tool.

Does a scan tool indicate DTC P1791? — Go to
Step 3 Refer to
Diagnostic Aids
3 Replace the TCM.
Important: The replacement TCM must be
programmed (Refer to SPS for procedure).

Is the action complete? — Go to
Step 4 —
4 1. Reconnect all previously disconnected harness
connector(s).
2. Clear the DTCs with a scan tool.
3. Turn “OFF” the ignition.
4. Start the engine.
5. Operate the vehicle within the Conditions For Running the DTC. You may also operate the
vehicle within the conditions that you observed
from the Freeze Frame/ Failure Records.

Did the DTC fail this ignition? —
Go to Step 2 Go to Step 5
5 Observe the stored information, Capture info with a
scan tool.

Are there any DTCs that you have not diagnosed? —
Go to
Diagnostic
Trouble Code (DTC) List Verify repair


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ISUZU KB P190 2007

7A2-106 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

(4) 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
The TCM detects following conditions for 0.5 seconds
continuously at shifting.
• Voltage at connector pin is 0V when solenoid is “ON”.
(DTC P2769)
• Voltage at connector pin is ignition voltage when
solenoid is “OFF”. (DTC P2770)
Action Taken When The DTC Sets
• No L-up solenoid functional failure detection.
• No squat control. (DTC P2770)
• The TCM fixes to 1st gear when the vehicle speed is less than 10 km/h (6 mph).
• 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.
Circuit/System Testing DTC P2769 or P2770

Step Action Value(s) YES NO
1
W as the On-Board Diagnostic (OBD) System Check
performed? — Go to
Step 2 Go to OBD
System Check
2 1. Install a scan tool.
2. Start the engine.
3. Drive the vehicle in D position.
4. Accelerate the vehicle until the gear position
becomes the 4th.
5. Release the accelerator pedal and accelerate the vehicle until the gear position becomes the 4th
again.

Does a scan tool indicate DTC P2769 or P2770? — Go to
Step 3 Refer to
Diagnostic Aids

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-107

Step Action Value(s) YES NO
3 1. Turn “ON” the ignition with the engine “ON”.
2. Place the selector lever in the “P” position.
3. Measure the voltage between terminal C94-5 and terminal C94-1 on the TCM pigtail connector by 5-
8840-0285-0 DMM.

Is the voltage specified value? 8∼16V Go to
Step 4 Go to Step 5
4 1. Turn “OFF” the ignition.
2. Disconnect the TCM connector (C-94).
3. Turn “ON” the ignition.
4. Measure the voltage between terminal C94-5 and
terminal C94-1 by 5-8840-0285-0 DMM.

Is the voltage specified value? 8∼16V Go to
Step 7 Go to Step 10
5 1. Turn “OFF” the ignition.
2. Measure the resistance between terminal C94-5
and body ground by 5-8840-0285-0 DMM.

Is the resistance specified value? 11
∼15 Ω Go to Step 9 Go to Step 6
6 1. Disconnect the automatic transmission connector
(E-54).
2. Measure the resistance between terminal E54-7
and body ground by 5-8840-0285-0 DMM.

Is the resistance specified value? 11
∼15 Ω Go to Step 7 Go to Step 8
7 1. Check for open or short in the wire between
terminal C94-5 and terminal E54-7.
2. Repair or replace the wire between terminal C94-5
and terminal E54-7.

Is the action complete? — Go to
Step 11 —
8 Replace the SL solenoid.

Is the action complete? — Go to
Step 11 —
9 1. Clear the DTC.
2. Perform the test-driving.
3. Check the DTC.

W as DTC P2769 or P2770 stored? — Go to
Step 10 Refer to
Diagnostic Aids
10 Replace the TCM.
Important: The replacement TCM must be
programmed (Refer to SPS for procedure).

Is the action complete? — Go to
Step 11 —

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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