2007 ISUZU KB P190 Electrical

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–73
Step Action Yes No
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.
4.24 DTC P0787 – 3-2 Shift Solenoid Control
Circuit Low Voltage
DTC Description
This diagnostic procedure supports the following DTC:
DTC P0787 3-2 Shift Solenoid (SS) Control Circuit Low Voltage.
Circuit Description
The 3-2 shift solenoid (SS) valve is a normally-closed, 3-port, on/off device that controls the 3-2 downshift. The solenoid
attaches to the control valve body within the transmission. The solenoid receives ignition voltage through the ignition
circuit. The transmission control module (TCM) controls the solenoid by providing a ground path on the 3-2 shift solenoid
valve control circuit. During a 3-2 downshift, the 2-4 band applies as the 3-4 clutch releases. The TCM varies the timing
between the 3-4 clutch release and the 2-4 band apply depending on the vehicle speed and the throttle position.
When the TCM detects a continuous open or short to ground in the 3-2 SS valve circuit, then DTC P0787 sets.
DTC P0787 is a type A DTC.
Refer to 2 W iring Diagrams and Connector Chart to aid in diagnosis.
Conditions for Running the DTC
• The system voltage is 10 – 18 V.
• The engine speed is greater than 450 r.p.m. for 5 seconds.
• Vehicle speed is less than 200 km/h.
Conditions for Setting the DTC
The TCM commands the solenoid off and the voltage feedback remains low, 0 V.
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 commands maximum line pressure.
• The TCM freezes transmission adaptive functions.
• The TCM commands 3rd gear.
• The TCM inhibits TCC engagement.
• 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 P0787 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.

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–74
• 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 DTC default actions when the ignition is off long enough to power down the TCM.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
4 Checks the ability of the TCM to control the solenoid.
5 Checks for supply voltage to the 3-2 SS valve.
6 Checks the ability of the TCM and wiring to control the ground circuit.
8 Checks the resistance of the control valve body wiring harness and the 3-2 SS valve.
9 Checks if the 3-2 SS or control valve body wiring harness is shorted to the transmission housing.
13 Checks if the control valve body wiring harness is shorted to ground.
14 Checks if any of the other solenoids in the transmission are shorted to ground.
DTC P0787 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.
NOTE
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?
• P0961
• P0973
• P0976
• P2764
• P2769. Go to Step 3 Go to Step 4
3 Inspect fuse C-8 and check if it is blown, refer to 8A Electrical-Body
and Chassis.
Is the fuse blown? Replace the fuse
Go to Step 12 Go to Step 5

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–75
Step Action Yes No
4 1 On Tech 2 select:
Automatic Transmission / Miscellaneous Tests / 3-2
Downshift Solenoid.
2 With Tech 2 command the 3-2 shift solenoid ON and
OFF .
Does Tech 2 display the 3-2 Downshift Solenoid as Active and
Inactive respectively? Check for an
intermittent fault in the circuit, refer to
8A Electrical-Body and Chassis Go to Step 5
5 1 Turn off the ignition.
2 Disconnect connector E-95 from the transmission.
NOTE
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 6 Test between
E-95 pin 10 and
C-107 pin 9 for an open circuit
Repalce affected circuit
Go to Step 18
6 1 Using a test lamp, probe connector E-95 pin 10 with the ground
lead to connector E-95 pin 11.
2 On Tech 2 select: Automatic Transmission / Miscellaneous Tests / 3-2
Downshift Solenoid.
3 With Tech 2 command the 3-2 shift solenoid ON and OFF three
times.
Does the test lamp turn on and off with each command? Go to Step 8 Go to Step 7
7 Is the test lamp always illuminates? Go to Step 15 Go to Step 16
8 1 Remove Tool No. J44152 from the harness connector E-95 and
install on to the transmission connector E-95.
2 Using a multimeter set to measure resistance, probe across transmission connector E-95 pins 10 and 11.
Does the multimeter display 20 – 32 Ω? Go to Step 9 Go to Step 10
9 1 Using a multimeter set to measure resistance, probe between:
• Transmission connector E-95 pin 10 and a known ground.
• Transmission connector E-95 pin 11 and a known ground.
Does the multimeter display greater than 250 k Ω in both instances? Check for an
intermittent fault in
the circuit, refer to
8A Electrical-Body
and Chassis Go to Step 11
10 1 Remove Tool No. J44152 from the transmission.
2 Gain access to the 3-2 SS and the control valve body wiring harness, refer to 7C4 Automatic Transmission – 4L60E – On-
vehicle Servicing.
3 Disconnect the internal connector from the 3-2 SS.
4 Using a multimeter set to measure resistance, probe across the 3-2 SS pins.
Does the multimeter display 20 – 32 Ω? Replace the control
valve body wiring
harness, refer to 7C4 Automatic
Transmission –
4L60E – On-vehicle
Servicing.
Go to Step 18 Replace the 3-2 SS,
refer to
7C4 Automatic
Transmission –
4L60E – On-vehicle Servicing.
Go to Step 18

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–76
Step Action Yes No
11 1 Remove Tool No. J44152 from the transmission.
2 Gain access to the 3-2 SS and the control valve body wiring harness, refer to 7C4 Automatic Transmission – 4L60E – On-
vehicle Servicing.
3 Disconnect the internal connector from the 3-2 SS.
4 Using a multimeter set to measure resistance, probe between each of the 3-2 SS pins and the transmission case.
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 18 Replace the 3-2
shift solenoid, refer to 7C4 Automatic
Transmission –
4L60E – On-vehicle Servicing.
Go to Step 18
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 18 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 18 Go to Step 14
14 1 Test each solenoid in the transmission for a short to ground,
refer to 8A Electrical-Body and Chassis.
2 Replace the faulty solenoid as necessary.
Did you complete the replacement? Go to Step 18 —
15 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 18 Go to Step 17
16 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 18 Go to Step 17
17 Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Servicing.
Did you complete the replacement? Go to Step 18
—
18 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 D3 or D4 and perform a 3-2 downshift. Ensure the 3-2 Downshift Solenoid parameter displays On
when the shift occurs.
5 On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Has DTC P0787 set? Go to Step 2 Go to Step 19
19 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

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–77
Step Action Yes No
When all diagnosis and repairs are completed, check the system for correct operation.
4.25 DTC P0788 – 3-2 Shift Solenoid Control
Circuit High Voltage
DTC Description
This diagnostic procedure supports DTC P0788 3-2 Shift Solenoid (SS) Control Circuit High Voltage.
Circuit Description
The 3-2 shift solenoid (SS) valve is a normally-closed, 3-port, on/off device that controls the 3-2 downshift. The solenoid
attaches to the control valve body within the transmission. The solenoid receives ignition voltage through the ignition 1
circuit. The transmission control module (TCM) controls the solenoid by providing a ground path on the 3-2 shift solenoid
valve control circuit. During a 3-2 downshift, the 2-4 band applies as the 3-4 clutch releases. The TCM varies the timing
between the 3-4 clutch release and the 2-4 band apply depending on the vehicle speed and the throttle position.
When the TCM detects a continuous short to voltage in the 3-2 shift solenoid valve control circuit, then DTC P0788 sets.
DTC P0788 is a type A DTC.
Refer to 2 W iring Diagrams and Connector Chart to aid in diagnosis.
Conditions for Running the DTC
• The system voltage is 10 – 18 V.
• The engine speed is 450 r.p.m. for 5 seconds.
• The engine is not in fuel cut off.
Conditions for Setting the DTC
DTC P0788 sets if the TCM commands the solenoid on and the voltage feedback remains high, battery voltage.
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 commands maximum line pressure.
• The TCM freezes transmission adaptive functions.
• The TCM commands 3rd gear.
• The TCM inhibits TCC engagement.
• 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 P0788 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.
• The TCM cancels the DTC default actions when the ignition is off long enough to power down the TCM.

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–78
Test Description
The following numbers refer to the step numbers in the diagnostic table:
2 Checks for a short to voltage in the 3-2 SS signal circuit.
3 Checks for the serviceability of the 3-2 SS.
DTC P0788 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.
NOTE
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 Turn off the ignition.
8 Disconnect connector E-95 from the transmission.
NOTE
Additional DTCs may set
9 Install Tool No. J 44152 Jumper Harness (20 pins) on to the harness connector E-95.
10 Turn on the ignition, with the engine off.
11 Using a test lamp and Tool No. J 35616-C, probe between connector E-95 pin 11 and a known ground.
Does the test lamp illuminate? Go to Step 5 Go to Step 3
3 1 Install Tool No. J 44152 to the transmission connector E-95.
2 Using a multimeter set to measure resistance, probe across transmission connector E-95 pins 10 and 11.
Does the multimeter display less than 20 Ω? Go to Step 4 Go to Step 6

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–79
Step Action Yes No
4 1 Remove Tool No. J44152 from the transmission.
2 Gain access to the 3-2 SS and the control valve body wiring harness, refer to 7C4 Automatic Transmission – 4L60E – On-
vehicle Servicing.
3 Disconnect the internal connector from the 3-2 SS.
4 Using a multimeter set to measure resistance, probe across the 3-2 SS pins.
Does the multimeter display less than 20 Ω? Replace the 3-2 SS,
refer to
7C4 Automatic
Transmission –
4L60E – On-vehicle Servicing
Go to Step 7 Replace the control
valve body wiring harness, refer to 7C4 Automatic
Transmission –
4L60E – On-vehicle Servicing.
Go to Step 7
5 Using a multimeter, test between E-95 pin 11 and C-96 pin 14 for a
short to voltage.
Did you find and correct the condition? Go to Step 7 Go to Step 6
6 Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Servicing.
Did you complete the replacement? Go to Step 7 —
7 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 D3 or D4 and perform a 3-2 downshift. Ensure the 3-2 Downshift Solenoid parameter displays On
when the shift occurs and Off in all other instances
5 On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Has DTC P0787 set? Go to Step 2 Go to Step 8
8 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.
4.26 DTC P0894 – Transmission Component
Slipping
DTC Description
This diagnostic procedure supports DTC P0894 Transmission Component Slipping.
Circuit Description
The transmission control module (TCM) monitors the difference between engine speed and transmission output speed.
In D3 drive range with the TCC engaged, the engine speed should closely match the transmission output speed. In D4
drive range, with the TCC engaged, the TCC slip speed should be -20 to +50 r.p.m.
W hen the TCM detects excessive TCC slip when the TCC should be engaged, then DTC P0894 sets. DTC P0894 is a
type B DTC.
Refer to 2 W iring Diagrams and Connector Chart to aid in diagnosis.

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–80
Conditions for Running the DTC
• No DTCs P0122, P0123, P0722, P0723, P0741, P0742, P0751, P0752, P0756, P0757, P0973, P0974, P1810,
P1815, P1816, P2763 or P2764.
• The engine speed is greater than 450 r.p.m. for 5 seconds.
• The engine is not in fuel cut-off.
• The engine torque is 108 Nm – 882 Nm.
• The vehicle speed is 48 – 177 km/h.
• The engine speed is 1,200 – 3,750 r.p.m.
• The speed ratio is 0.70 – 2.25, speed ratio is engine speed divided by the transmission output speed.
• The gear range is D4.
• The commanded gear is not 1st gear.
• The TFT is 20 – 130°C.
• The shift solenoid performance diagnostic counters are zero.
Conditions for Setting the DTC
DTC P0894 sets if the following conditions occur for three TCC cycles.
• The TCC is commanded on for 5 seconds.
• The throttle position is greater than 10 percent.
• The TCC slip speed is 100 – 550 r.p.m. for 10 seconds.
NOTE
The following actions may occur before the DTC
sets, if the:
• TCC is commanded on for 10 seconds, and
• the TCC is at 75 percent duty cycle for
5 seconds, and
• the TP angle is 10 – 99 percent, and
• the transmission slip counter has incremented
to either 1 or 2, out of 3 to increment the fail
counter for the current ignition cycle,
then the following slip conditions and actions may
increment the fail counter for the current ignition
cycle. These conditions must occur sequentially.
Condition 1
If the TCC slip speed is 100 – 550 r.p.m. for 10 seconds, then the TCM will command maximum line pressure and freeze
shift adapts from being updated.
Condition 2
If Condition 1 is met and the TCC slip speed is 100 – 550 r.p.m. for 10 seconds, then the TCM will command the TCC off
for 1.5 seconds.
Condition 3
If Condition 2 is met and the TCC slip speed is 100 – 550 r.p.m. for 10 seconds, then the fail counter on the current
ignition cycle is incremented.
The above slip conditions and actions may be disregarded if the TCC is commanded off at any time, because of a driving
manoeuvre, sudden acceleration or deceleration.

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ISUZU KB P190 2007