Isuzu KB P190. Manual — part 975
Automatic Transmission – 4L60E – Electrical Diagnosis
Page 7C2–114
Step Action
Yes
No
11 1
Remove Tool No. J44152 from the transmission.
2
Gain access to the TCC PWM solenoid and the control valve
body wiring harness, refer to 7C4 Automatic Transmission –
4L60E – On-vehicle Servicing.
3
Using a multimeter set to measure resistance, probe between
each of the TCC PWM solenoid pins and a known ground.
Does the multimeter display 250 k
Ω in both instances?
Replace the control
valve body wiring
harness, refer to
7C4 Automatic
Transmission –
4L60E – On-vehicle
Servicing
Go to Step 19
Replace the TCC
PWM solenoid, refer
to 7C4 Automatic
Transmission –
4L60E – On-vehicle
Servicing.
Go to Step 19
12 Using a multimeter, test between E-95 pin 10 and C-107 pin 9 for a
short to ground.
Did you find and correct the condition?
Go to Step 19
Go to Step 13
13 1
Gain access to the control valve body wiring harness, refer to
7C4 Automatic Transmission – 4L60E – On-vehicle Servicing.
2
Test for a short to ground in the control valve body wiring
harness.
Did you find a short to ground condition?
Replace the control
valve body wiring
harness, refer to
7C4 Automatic
Transmission –
4L60E – On-vehicle
Servicing
Go to Step 19
Go to Step 14
14 1
Test each solenoid for a short to ground.
2
Replace the faulty solenoid as necessary.
Did you complete the replacement?
Go to Step 19
—
15 Using a multimeter, test between E-95 pin 10 and C-107 pin 9 for an
open circuit.
Did you find and correct the condition?
Go to Step 19
—
16 Using a multimeter, test between E-95 pin 11 and C-96 pin 14 for a
short to ground.
Did you find and correct the condition?
Go to Step 19
Go to Step 20
17 Using a multimeter, test between E-95 pin 11 and C-96 pin 14 for an
open circuit.
Did you find and correct the condition?
Go to Step 19
Go to Step 20
18 Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Servicing.
Did you complete the replacement?
Go to Step 19
—
19 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:
Data Display / TCC Data.
4
Drive the vehicle in D4 and ensure the TCC Duty Cycle Circuit
parameter displays Okay for 5 seconds.
5
On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Has DTC P2764 set?
Go to Step 2
Go to Step 20
Automatic Transmission – 4L60E – Electrical Diagnosis
Page 7C2–115
Step Action
Yes
No
20 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.
4.35 DTC P2769 – Torque Converter Clutch
Enable Solenoid Control Circuit Low
Voltage
DTC Description
This diagnostic procedure supports DTC P2769 Torque Converter Clutch (TCC) Enable Solenoid Control Circuit Low
Voltage.
Circuit Description
The torque converter clutch (TCC) solenoid valve is an electrical device that is used with the torque converter clutch
pulse width modulation (TCC PWM) solenoid valve to control TCC apply and release. The TCC solenoid valve attaches
to the transmission case assembly extending into the pump cover. The TCC solenoid valve receives voltage through
ignition voltage circuit. The transmission control module (TCM) controls the solenoid by providing the ground path on the
TCC solenoid valve control circuit. The TCM monitors the throttle position (TP) voltage, the vehicle speed and other
inputs to determine when to energize the TCC solenoid valve.
N O T E
The TCC solenoid valve is part of the control
valve body wiring harness. To replace the
solenoid valve, the control valve body harness
must be replaced.
When the TCM detects a continuous open or short to ground in the TCC solenoid valve control circuit, then DTC P2769
sets. DTC P2769 is a type B DTC.
Refer to 2
Wiring Diagrams and Connector Chart to aid in diagnosis.
Conditions for Running the DTC
•
The system voltage is 8 – 18 V.
•
The engine speed is 500 r.p.m. for 5 seconds.
Conditions for Setting the DTC
DTC P2769 sets when either of the following conditions occurs for 5 seconds:
•
The TCM detects an open in the TCC solenoid valve circuit when the TCC is commanded on.
•
The TCM detects a short to ground in the TCC shift solenoid valve circuit when the TCC is commanded on.
Action Taken When the DTC Sets
•
The TCM requests the ECM to illuminate the MIL during the second consecutive trip in which the conditions for
setting the DTC are met.
•
The TCM freezes transmission adaptive functions.
•
The TCM inhibits TCC engagement.
•
The TCM inhibits 4th gear if in hot mode.
•
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.
Automatic Transmission – 4L60E – Electrical Diagnosis
Page 7C2–116
•
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 P2769 in TCM history during the second consecutive trip in which the conditions for setting
the DTC are met.
Conditions for Clearing the DTC
•
The ECM turns off the MIL after the fourth 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.
Diagnostic Aids
With the TCC engaged, the TCC slip speed should be -20 – +40 r.p.m.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
4
Checks for supply voltage to the 3-2 SS valve.
5
Checks the ability of the TCM and wiring to control the ground circuit.
7
Checks the resistance of the control valve body wiring harness and the TCC solenoid valve.
8
Checks if the TCC solenoid valve or control valve body wiring harness is shorted to the transmission housing.
10
Checks if the control valve body wiring harness is shorted to ground.
11
Checks whether any of the other solenoids in the transmission are shorted to ground.
DTC P2769 Diagnostic Table
1
Has the Diagnostic System Check been performed?
Go to Step 2
Refer to
4.7 Diagnostic
System Check
Automatic Transmission – 4L60E – Electrical Diagnosis
Page 7C2–117
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.
Are any of the following DTCs also set?
•
P0787
•
P0973
•
P0976
•
P2764.
Go to Step 3
Go to Step 4
3
Inspect fuse F8 and check if it is blown, refer to 8A Electrical-Body
and Chassis.
Is the fuse blown?
Replace the fuse
Go to Step 9
Go to Step 5
4
1
Turn off the ignition.
2
Disconnect connector E-95 from the transmission.
N O T E
Additional DTCs may set.
3
Install Tool No. J 44152 Jumper Harness (20 pins) on to the
harness connector E-95.
4
Turn on the ignition, with the engine off.
5
Using a test lamp, probe between connector E-95 pin 10 and a
known ground.
Does the test lamp illuminate?
Go to Step 7
Go to Step 12
5
1
Using a test lamp, probe connector E-95 pin 10 with the ground
lead to connector E-95 pin 20.
2
On Tech 2 select:
Automatic Transmission / Miscellaneous Tests / TCC
Solenoid.
3
With Tech 2 command the TCC Solenoid On and Off three
times.
Does the test lamp turn on and off with each command?
Go to Step 7
Go to Step 6
6
Is the test lamp always illuminated?
Go to Step 13
Go to Step 14
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