Page 4042 of 6020
7A2-76 TRANSMISSION CONTROL SYSTEM (AW30–40LE)
Circuit/System Testing DTC P0751
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 “ON” the ignition.
3. Review and record scan tool data.
4. Operate the vehicle within scan tool data.
Does a scan tool indicate DTC P0751? — Go to
Step 3 Refer to
Diagnostic Aids
3 Perform the transmission fluid checking procedure.
Refer to checking Transmission Fluid level and
Condition in Automatic Transmission 7A section.
If the problem found, repair or replaces necessary.
W as the problem found? — Go to
Step 8 Go to Step 4
4 Observe the commanded gear and current gear on a
scan tool.
1. Turn “ON” the ignition with engine “ON”.
2. Road testing the vehicle.
3. The throttle position is more than 8%.
4. The vehicle speed is more than 5 km/h (3 mph).
Did the TCM detect 4th gear ratio in case of 1st gear
target, and 3rd gear ratio in case of 2nd gear target?
Above conditions were indicated on a scan tool
display? — Refer to
Diagnostic Aids Go to
Step 5
5 Check the following items.
• Check the shift solenoid valve S1. (Refer to
Section 7A3)
• Shift solenoid valve S1 stuck “OFF” the release
position (Refer to Section 7A4)
• Misaligned or damaged valve body gasket.
• Restricted apply passage.
If the problem found, replaces necessary.
W as the problem found? — Go to
Step 8 Go to Step 6
6 Check the DTC on a scan tool.
Is DTC found on a scan tool? — Go to
Step 7 Go to Step 8
7 Replace the valve body. (Refer to Section 7A4).
Is the action complete? — Go to
Step 8 —
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 4043 of 6020
TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-77
Step Action Value(s) YES NO
8 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 9
9 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
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 4046 of 6020
7A2-80 TRANSMISSION CONTROL SYSTEM (AW30–40LE)
Circuit/System Testing DTC P0752
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 “ON” the ignition.
3. Review and record scan tool data.
4. Operate the vehicle within scan tool data.
Does a scan tool indicate DTC P0752? — Go to
Step 3 Refer to
Diagnostic Aids
3 Perform the transmission fluid checking procedure.
Refer to checking Transmission Fluid level and
Condition in Automatic Transmission 7A section.
If the problem found, repair or replaces necessary.
W as the problem found? — Go to
Step 8 Go to Step 4
4 Observe the commanded gear and current gear on
the scan tool.
1. Turn “ON” the ignition with engine “ON”.
2. Road testing the vehicle.
3. The throttle position is more than 8%.
4. The vehicle speed is more than 5 km/h (3 mph).
Did the TCM detect 2nd gear ratio in case of 3rd gear
target? Above conditions were indicated on the scan
tool display? — Refer to
Diagnostic Aids Go to
Step 5
5 Check the following items.
• Check the shift solenoid valve S1. (Refer to
Section 7A3)
• Shift solenoid valve S1 stuck “ON” the release
position (Refer to Section 7A4)
• Misaligned or damaged valve body gasket.
• Restricted apply passage.
If the problem found, replaces necessary.
W as the problem found? — Go to
Step 8 Go to Step 6
6 Check the DTC on a scan tool.
Is DTC found on a scan tool? — Go to
Step 7 Go to Step 8
7 Replace the valve body. (Refer to Section 7A4).
Is the action complete? — Go to
Step 8 —
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 4047 of 6020
TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-81
Step Action Value(s) YES NO
8 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 9
9 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
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 4050 of 6020
7A2-84 TRANSMISSION CONTROL SYSTEM (AW30–40LE)
Circuit/System Testing DTC P0756
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 the scan tool.
2. Turn “ON” the ignition.
3. Review and record scan tool data.
4. Operate the vehicle within scan tool data.
Does a scan tool indicate DTC P0756? — Go to
Step 3 Refer to
Diagnostic Aids
3 Perform the transmission fluid checking procedure.
Refer to checking Transmission Fluid level and
Condition in Automatic Transmission 7A section.
If the problem found, repair or replace necessary.
W as the problem found? — Go to
Step 8 Go to Step 4
4 Observe the commanded gear and current gear on
the scan tool.
1. Turn “ON” the ignition with engine “ON”.
2. Road testing the vehicle.
3. The throttle position is more than 8%.
4. The vehicle speed is more than 5 km/h (3 mph).
Did the TCM detect 1st gear ratio in case of 2nd gear
target, and 4th gear ratio in case of 3rd gear target?
Above conditions were indicated on a scan tool
display? — Refer to
Diagnostic Aids Go to
Step 5
5 Check the following items.
• Check the shift solenoid valve S2. (Refer to
Section 7A3)
• Shift solenoid valve S2 stuck “OFF” the release
position (Refer to Section 7A4)
• Misaligned or damaged valve body gasket.
• Restricted apply passage.
If the problem found, replaces necessary.
W as the problem found? — Go to
Step 8 Go to Step 6
6 Check the DTC on a scan tool.
Is DTC found on a scan tool? — Go to
Step 7 Go to Step 8
7 Replace the valve body. (Refer to Section 7A4).
Is the action complete? — Go to
Step 8 —
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 4051 of 6020
TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-85
Step Action Value(s) YES NO
8 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 9
9 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
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 4054 of 6020
7A2-88 TRANSMISSION CONTROL SYSTEM (AW30–40LE)
Circuit/System Testing DTC P0757
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 “ON” the ignition.
3. Review and record scan tool data.
4. Operate the vehicle within scan tool data.
Does a scan tool indicate DTC P0757? — Go to
Step 3 Refer to
Diagnostic Aids
3 Perform the transmission fluid checking procedure.
Refer to checking Transmission Fluid level and
Condition in Automatic Transmission 7A section.
If the problem found, repair or replace necessary.
W as the problem found? — Go to
Step 8 Go to Step 4
4 Observe the commanded gear and current gear on
the scan tool.
1. Turn “ON” the ignition with engine “ON”.
2. Road testing the vehicle.
3. The throttle position is more than 8%.
4. The vehicle speed is more than 5 km/h (3 mph).
Did the TCM detect 2nd gear ratio in case of 1st gear
target, and 3rd gear ratio in case of 4th gear target?
Above conditions were indicated on the scan tool
display? — Refer to
Diagnostic Aids Go to
Step 5
5 Check the following items.
• Check the shift solenoid valve S2. (Refer to
Section 7A3)
• Shift solenoid valve S2 stuck “ON” the release
position (Refer to Section 7A4)
• Misaligned or damaged valve body gasket.
• Restricted apply passage.
If the problem found, replaces necessary.
W as the problem found? — Go to
Step 8 Go to Step 6
6 Check the DTC on a scan tool.
Is DTC found on a scan tool? — Go to
Step 7 Go to Step 8
7 Replace the valve body. (Refer to Section 7A4).
Is the action complete? — Go to
Step 8 —
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 4055 of 6020
TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-89
Step Action Value(s) YES NO
8 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 9
9 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
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
