Isuzu KB P190. Manual — part 1008
7A2-66 TRANSMISSION CONTROL SYSTEM (AW30–40LE)
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
TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-67
DTC P0742 (Flash Code 53)
RTW77ALF001501
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 Transmission
Control Module (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.
• 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.
7A2-68 TRANSMISSION CONTROL SYSTEM (AW30–40LE)
(2) Oil temperature is more than 20
°C (68°F), and
water temperature signal is more than 70
°C
(158
°F).
(3) 20 seconds or more passed after D position is
detected.
(4) Oil temperature sensor is not deciding failure.
(5) Engine coolant temperature sensor is not detecting
failure or not deciding failure.
(6) The engine revolution is more than 600 rpm.
(7) Engine revolution sensor is not detecting failure or
not deciding failure.
(8) T/F condition is high.
(9) T/F Hi-Low SW is not detecting failure or not
deciding failure.
(10) Output revolution sensor is not detecting failure or
not deciding failure.
(11) S1 solenoid is not detecting failure or not deciding
failure. (Electronic failure)
(12) S2 solenoid is not detecting failure or not deciding
failure. (Electronic failure)
(13)
L-up solenoid is not detecting failure or not
deciding failure. (Electronic failure)
(14) Selector position switch is not detecting failure or
not deciding failure.
(15) DTC U2104 is not detecting failure or not deciding
failure.
(16) DTC U2105 is not detecting failure or not deciding
failure.
(17) Input revolution sensor is not deciding failure.
(18)
Throttle signal is not detecting failure or not
deciding failure.
(19) Not emergency mode.
(20) Engine torque signal is not detecting failure or not
deciding failure.
(21) Pressure control solenoid is not detecting failure
not deciding failure.
(22) 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
The following conditions are detected two times or more
between ignition “ON” and ignition “OFF”.
The TCM detects following conditions are met for 1
second continuously.
• 2 second passed after gear change output and L-up
“ON”/”OFF” output.
• T/C revolution difference more than 100 rpm for 1
second continuously.
• 3rd gear lock-up “OFF”.
Action Taken When The DTC Sets
• No squat control. (For preventing engine stall)
• Fix 1st gear to prevent engine stall when vehicle
speed is and below 10 km/h (6 mph). (Cancel at 15
km/h {9 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.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.
• When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-69
Circuit/System Testing DTC P0742
Step Action Value(s)
YES
NO
1
Was the On-Board Diagnostic (OBD) System Check
performed? 1. Install the scan tool.
— 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 P0742?
— 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.
Was the problem found?
— Go
to
Step 8 Go
to
Step 4
4
Observe the TCC slip speed data on a scan tool.
1. Turn “ON” the ignition with engine “ON”.
2. Road testing the vehicle.
3. The throttle position is more than 20%.
4. The vehicle speed is between 5 km/h (3 mph) and
100 km/h (62 mph).
5. The TCC slip speed is more than 150 rpm at 2nd
gear L-up “OFF”.
6. The throttle position is more than 25%.
7. The vehicle speed is between 5 km/h (3 mph) and
80 km/h (50 mph).
8. The T/C revolution difference is less than 100 rpm
at 3rd L-up “OFF”.
Above conditions were indicated on a scan tool
display?
— Refer
to
Diagnostic Aids
Go to Step 5
5
Check the following items.
• Check the L-up solenoid valve. (Refer to Section
7A3)
• L-up solenoid valve stuck “ON” the release position
(Refer to Section 7A4)
• Misaligned or damaged valve body gasket.
• Restricted apply passage.
If the problem found, replaces as necessary.
Was 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
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