Isuzu KB P190. Manual — part 961
Automatic Transmission – 4L60E – Electrical Diagnosis
Page 7C2–58
Conditions for Running the DTC
•
No DTCs P0722, P0723, P0742, P2763 or P2764.
•
The IMS range is D2, D3 or D4.
•
Ignition voltage is 8 – 18 V.
•
The transmission fluid temperature is greater than 20°C.
•
The engine torque is 108 – 881 Nm.
•
The throttle position is greater than 10 percent.
•
The gear ratio is within the following ranges:
•
1.41:1 – 1.56:1 — 2nd gear,
•
0.95:1 – 1.05:1 — 3rd gear.
•
The TCC is commanded on 0.1 seconds.
•
The TCC duty cycle is greater than 60 percent for more than 3 seconds.
Conditions for Setting the DTC
The TCM commands the TCC on, and the TCC slip is greater than 250 r.p.m. for 3 seconds.
Action Taken When the DTC Sets
•
The TCM requests the ECM to illuminate the MIL during the second consecutive drive trip in which the conditions
for setting the DTC are met.
•
The TCM inhibits TCC.
•
The TCM inhibits 4th gear if the transmission is in Hot Mode.
•
The TCM commands elevated line pressure.
•
The TCM freezes transmission adaptive functions.
•
At the time of the first failure, the TCM records the operating conditions when the conditions for setting the DTC are
met. The TCM stores this information as a Failure Record.
•
At the time of the second failure, the ECM records the operating conditions when the conditions for setting the DTC
are met. The ECM stores this information as a Freeze Frame.
•
The TCM stores DTC P0741 in TCM history.
Conditions for Clearing the DTC
•
The ECM turns off the MIL after the sixth consecutive drive trip in which the TCM does not send a MIL illumination
request.
•
Tech 2 can clear the DTC.
•
The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission
related diagnostic fault occurring.
•
The TCM cancels the default actions when the ignition is off long enough to power down the TCM.
Diagnostic Aids
•
Inspect the transmission fluid lines to the radiator. The lines may be pinched, blocked or twisted.
•
Contamination may cause the TCC apply valve to stick in the valve body.
•
Internal damage to the torque converter may prevent TCC application.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
Automatic Transmission – 4L60E – Electrical Diagnosis
Page 7C2–59
2
This step tests the hydraulic state of the TCC. When the TCM commands the TCC solenoid valve off, the slip
speed should increase.
3
Checks the mechanical components that cause the DTC and their state.
DTC P0741 Diagnostic Table
Step Action
Yes
No
1
Has the Diagnostic System Check been performed?
Go to Step 2
Refer to
4.7 Diagnostic
System Check
2
1
Connect Tech 2 to the DLC.
2
Turn on the ignition, with the engine off.
N O T E
Before clearing the DTC, use the Tech
2 Freeze
Frame/Failure Record to record the transmission
parameters at the time the DTC set. Using Tech 2 to clear
the DTC(s) erases the Freeze Frame/Failure Record
records from the TCM.
3
On Tech 2 select:
Transmission / Automatic Transmission / Diagnostic
Trouble Codes / Freeze Frame.
4
Select the relevant DTC and note the parameters at the time of
the DTC setting.
5
On Tech 2 select:
Diagnostic Trouble Codes / Clear Engine & Transmission
DTCs.
6
Follow the instructions on Tech 2 and clear the DTCs.
7
On Tech 2 select:
Automatic Transmission / Data Display / Transmission Data.
8
Drive the vehicle in the D4 drive range in second, third, or fourth
gear under steady acceleration, with a TP angle at 20%.
On Tech 2, while TCC Solenoid status is On, is the TCC Slip Speed
within -20 to +20 RPM?
Refer to Diagnostic
Aids within this
Section
Go to Step 3
3
The TCC system is hydraulically stuck off. Inspect for the following
conditions:
•
TCC PWM solenoid valve mechanically stuck in the off position
or leaking.
•
TCC regulator apply valve stuck in the off position.
•
TCC solenoid valve stuck in the off position or leaking.
•
TCC enable valve stuck in the off position.
•
Incorrectly aligned, damaged or leaking valve body gasket.
•
Inspect the forward clutch input housing assembly for the input
shaft fluid seal ring leaking or worn.
Did you find and correct any of the above conditions?
Go to Step 4
—
Automatic Transmission – 4L60E – Electrical Diagnosis
Page 7C2–60
Step Action
Yes
No
4
Perform the following procedure to verify the repair:
1
On Tech 2 select:
Diagnostic Trouble Codes / Clear Engine & Transmission
DTCs.
2
Follow the instructions on Tech 2 and clear any DTCs.
3
On Tech 2 select:
Automatic Transmission / Data Display / Transmission Data.
4
Drive the vehicle in D4 with the TCC on and the throttle above
10%. Ensure Tech 2 displays TCC Slip Speed between -25 to
+25 RPM for 3 seconds.
5
On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Has DTC P0741 set?
Go to Step 2
Go to Step 5
5
On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Does Tech 2 display any DTCs you have not diagnosed?
Refer to
4.8 Diagnostic
Trouble Code List
System OK
When all diagnosis and repairs are completed, check the system for correct operation.
4.19 DTC P0742 – Torque Converter Clutch
System – Stuck On
DTC Description
This diagnostic procedure supports DTC P0742 Torque Converter Clutch (TCC) System – Stuck On.
Circuit Description
The torque converter clutch (TCC) solenoid valve is a normally-open exhaust valve that is used with the torque converter
clutch pulse width modulation (TCC PWM) solenoid valve to control fluid acting on the converter clutch apply valve. The
TCC solenoid valve attaches to the transmission case assembly extending into the pump cover. When grounded by the
transmission control module (TCM), the TCC solenoid valve stops converter signal oil from exhausting. This causes
converter signal oil pressure to increase and move the converter clutch apply valve against spring force and into the
apply position. In this position, release fluid is open to an exhaust port and converter feed fluid fills the apply fluid circuit.
The converter feed fluid applies the TCC. When the TCM no longer provides a ground path, the TCC solenoid valve de-
energizes and apply fluid exhausts, releasing the TCC.
When the TCM detects low torque converter slip when the TCC is commanded off, then DTC P0742 sets. DTC P0742 is
a type B DTC.
Refer to 2
Wiring Diagrams and Connector Chart to aid in diagnosis.
Conditions for Running the DTC
•
No DTCs P0722, P0723, P0741 P02763, P02764, P02769 or P02770.
•
Ignition voltage is 8 – 18 V.
•
The engine run time is greater than 5 seconds.
•
The IMS range is D4.
•
The transmission fluid temperature is 10 – 130°C.
•
The engine speed is 500 – 6,500 r.p.m. for 5 seconds, then 800 – 4,400 r.p.m.
•
The engine torque is 156 – 881 Nm.
•
The throttle position is greater than 10 percent.
•
The transmission is not in 1st gear and the gear ratio is 0.95:1 – 1.56:1.
Automatic Transmission – 4L60E – Electrical Diagnosis
Page 7C2–61
•
The vehicle speed is greater than 15 km/h.
•
TCC is commanded off.
Conditions for Setting the DTC
The following conditions occur four times in one ignition cycle:
•
The TCM commands the TCC off.
•
The TCC slip is -15 – +15 r.p.m. for greater than 3 seconds.
Action Taken When the DTC Sets
•
The TCM requests the ECM to illuminate the MIL during the second consecutive drive trip in which the conditions
for setting the DTC are met.
•
The TCM commands maximum line pressure.
•
The TCM freezes transmission adaptive functions.
•
At the time of the first failure, the TCM records the operating conditions when the conditions for setting the DTC are
met. The TCM stores this information as a Failure Record.
•
At the time of the second failure, the ECM records the operating conditions when the conditions for setting the DTC
are met. The ECM stores this information as a Freeze Frame.
•
The TCM stores DTC P0742 in TCM history.
Conditions for Clearing the DTC
•
The ECM turns off the MIL after the sixth consecutive drive trip in which the TCM does not send a MIL illumination
request.
•
Tech 2 can clear the DTC.
•
The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission
related diagnostic fault occurring.
•
The TCM cancels the default actions when the ignition is off long enough to power down the TCM.
Diagnostic Aids
The TCC fluid hydraulically applies the TCC, possibly causing an engine stall, under the following conditions:
•
The TCC is hydraulically stuck in the on position
•
The parking brake is applied.
•
Any gear range is selected.
•
Contamination may cause the TCC apply valve to intermittently stick in the valve body.
•
Internal damage in the torque converter may cause no TCC apply.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
2
This step tests the hydraulic state of the TCC. When the TCM commands the TCC solenoid valve off, the slip
speed should increase.
3
Checks the mechanical components that cause the DTC and their state.
DTC P0742 Diagnostic Table
Step Action
Yes
No
1
Has the Diagnostic System Check been performed?
Go to Step 2
Refer to
4.7 Diagnostic
System Check
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