2007 ISUZU KB P190 cruise control

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–22
negative number indicates that short shifts have been detected and PC solenoid pressure has been subtracted to
increase shift time.
A/C Clutch: This parameter displays the condition of the sirconditioning compressor as either On or Off .
AT Output Speed: This parameter displays the rotational speed of the transmission output shaft. Tech 2 displays output
shaft speed as revolutions per minute (RPM).
Commanded Gear: This parameter displays the current commanded state of the shift solenoid valves. Tech 2 displays 1,
2 , 3 or 4.
Current TAP Cell: This parameter displays the current transmission adaptive pressure (TAP) cell in use for transmission
line pressure adaptation. The cells are based on 17 Nm of engine torque. The higher the engine torque, the higher the
current TAP cell. The last cell used will remain displayed until the next adaptable upshift occurs.
Engine Coolant Temperature: This parameter displays the input signal from the engine coolant temperate (ECT)
sensor. ECT is high at 151°C when the signal voltage is low, 0 V. ECT is low at -40°C when the signal voltage is high,
5 V.
Engine Speed: This parameter displays the rotational speed of the engine expressed as revolutions per minute.
Engine Torque: This parameter displays the calculated value based on engine load, throttle position, mass air flow, and
other engine inputs. This parameter is accurate to within 20 Nm of actual measured engine torque.
Estimated Gear Ratio: This parameter displays the estimated turbine speed divided by the transmission output speed.
Estimated turbine speed is calculated from engine speed and engine torque.
Ignition Voltage: This parameter displays the
system voltage measured at the ignition feed.
Latest Shift: This parameter displays the actual time of the last upshift. This value is only accurate if the shift was
adaptable.
PCS Actual Current: This parameter displays the current flow through the pressure control solenoid circuit, which is
measured by the control module. High current flow results in low line pressure. Low current flow results in high line
pressure.
PCS Duty Cycle: This parameter displays the commanded state of the pressure control solenoid, expressed as a
percentage of energised on time. A reading of low percent indicates zero on time, non-energised, or no current flow. A
high percent at idle indicates maximum on time, energised, or high current flow.
PCS Desired Current: This parameter displays the commanded current of the pressure control solenoid circuit. High
current results in low line pressure. Low current results in high line pressure.
Shift Pattern: This parameter displays Normal, Power or Cruise depending on what mode the transmission is in.
Shift Solenoid A: This parameter displays the commanded state of the 1-2 shift solenoid valve. W hen the transmission
is in 1
st and 4th gear, the display should indicate On; current is flowing through the solenoid. When the transmission is in
2nd and 3rd gear, the display should indicate Off; current is not flowing through the solenoid.
Shift Solenoid A Circuit: This parameter displays whether an open or a short to ground, short to battery or the circuit is
okay in the 1-2 shift solenoid valve feedback signal. The 1-2 shift solenoid valve must be commanded off and on.
Shift Solenoid B: This parameter displays the commanded state of the 2-3 shift solenoid valve. W hen the transmission
is in 1
st and 4th gear, the display should indicate On; current is flowing through the solenoid. When the transmission is in
2nd and 3rd gear, the display should indicate Off; current is not flowing through the solenoid.
Shift Solenoid B Circuit: This parameter displays whether an open or a short to ground, short to battery or the circuit is
okay in the 2-3 shift solenoid valve feedback signal. The 2-3 shift solenoid valve must be commanded off and on.
Speed Ratio: This parameter displays the calculated speed ratio of the transmission.
TCC Duty Cycle Circuit: This parameter displays whether an open or a short to ground, short to battery or the circuit is
okay in the TCC PW M solenoid valve feedback signal. The TCC PW M solenoid valve must be commanded off and on.
TCC Solenoid: This parameter displays the commanded sate of the TCC solenoid. On indicates a commanded
energised state; current is flowing through the solenoid. Off indicates a commanded non-energised state; current is not
flowing through the solenoid. This commanded state occurs at various vehicle speeds between applications.
TCC Slip Speed: This parameter displays the difference between transmission output speed and engine speed. A
negative value indicates the engine speed is less than the output speed, deceleration. A positive value indicates the
engine speed is greater than the output speed, acceleration. A value of zero indicates the engine speed is equal to the
output speed, TCC applied.
TCC PWM Solenoid: This parameter displays the commanded percentage of on time for the TCC PWM solenoid. A high
percentage represents an on, energised, commanded state.0 percent represents an off, non-energised, commanded
state.

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–48
Diagnostic Aids

• Verify if the brake pedal position sensor is
adjusted properly, refer to 8B Cruise
Control.
• Test drive the vehicle if a switch or circuit
condition cannot be located. An
intermittent condition may be duplicated
during a test drive.
• Application of the brake pedal while
accelerating may cause this DTC to set.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
2 Checks the stop lamp switch is serviceable.
4 Checks if there is a stop lamp switch signal to the TCM.
DTC P0719 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 On Tech 2 select: Engine / V6 Engine / Data Display / Cruise / Traction Data.
3 Turn on the ignition, with the engine off.
NOTE
Ensure the brake pedal is in the rest position.
Does the Stop Lamp Pedal Switch parameter indicate Inactive? Check for an
intermittent fault in
the circuit, refer to
8A Electrical-Body and Chassis Go to Step 3
3 Test the stop lamp switch assembly, refer to 8B Cruise Control.
Is the stop lamp switch assembly serviceable? Go to Step 4 Replace the stop
lamp switch
assembly.
4 1 Disconnect connector C-96 from the TCM.
2 Using a multimeter set to measure voltage, probe between harness connector C-96 pin 42 and a known ground.
NOTE
Ensure the brake pedal is in the rest position.
Does the multimeter display battery voltage? Repair or replace
affected circuit
Go to Step 6 Go to Step 5
5
Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Service.
Did you complete the replacement? Go to Step 6
—

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–56
Conditions for Running the DTC
• No DTCs P0719, P0722 or P0723.
• The vehicle speed is greater than 40 km/h for 7 seconds, then 8 – 40 km/h for 5 seconds, then less than 8 km/h.
• Continuously eight times once the previous criteria have been met.
Conditions for Setting the DTC
The TCM detects an open or short to ground on the stop lamp switch signal circuit when the circuit should be high,
battery voltage.
Action Taken When the DTC Sets
• The TCM does not request the engine control module (ECM) to illuminate the MIL.
• The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM records this
information as a Failure Record.
• The TCM stores DTC P0724 in TCM history.
Conditions for Clearing 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.
• Tech 2 can clear the DTC.
Diagnostic Aids

• Verify the brake pedal position sensor is
adjusted properly, refer to 8B Cruise
Control.
• Test drive the vehicle if a switch or circuit
condition cannot be located. An
intermittent condition may be duplicated
during a test drive.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
3 Checks if the stop lamp switch is serviceable.
4 Checks if there is a stop lamp switch signal to the TCM.
DTC P0724 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 On Tech 2 select: Engine / V6 Engine / Data Display / Cruise / Traction Data.
3 Turn on the ignition, with the engine off.
4 Press the brake pedal.
Does the Stop Lamp Pedal Switch parameter indicate
Active? Check for an
intermittent fault in the circuit, refer to
8A Electrical-Body and Chassis Go to Step 3

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–57
Step Action Yes No
3 Test the stop lamp switch assembly, refer to 8B Cruise Control.
Is the stop lamp switch assembly serviceable? Go to Step 4 Replace the stop
lamp switch assembly
4 1 Disconnect connector C-96 from the TCM.
2 Using a multimeter set to measure voltage, probe between harness connector C-96 pin 42 and a known ground.
3 Press the brake pedal.
Does the multimeter display battery voltage? Go to Step 5 Repair or replace
affected circuit
Go to Step 6
5 Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Servicing.
Did you complete the replacement? Go to Step 6 —
6 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 Operate the vehicle under the following conditions:
• Turn on the ignition, with the engine off for at least
2 seconds.
• Start the vehicle and idle for 5 seconds.
• Drive in D4 from 0 – 60 km/h then brake, eight times in one
ignition cycle.
4 On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Has DTC P0724 set? Go to Step 2 Go to Step 7
7 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.
4.18 DTC P0741 – Torque Converter Clutch
System – Stuck Off
DTC Description
This diagnostic procedure supports DTC P0741 Torque Converter Clutch (TCC) System - Stuck Off.
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. W hen 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 circu it.
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 high torque converter slip when the TCC is commanded off, then DTC P0741 sets. DTC P0741 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

7A2-12 TRANSMISSION CONTROL SYSTEM (AW30–40LE)
Control and Functions

Item Description
Shift and lock-up control Shift and lock-up points can be controlled in accordance with output of S1, S2, and SL solenoids based on "Shift-map" made up of vehicle speed and the opening.
Overdrive off cut control W hen the select lever is operated from D to 3, if the vehicle speed is more than 142km/h (89mph), TCM enables to remain overdrive in order to prevent over rev.
Lock-up cut control Lock-up is inhibited with following condition in order to improve the shift feeling.
• 1st gear
• Idling
• Operating brake switch
• L position
• During shift change
Driveng mode select control
• The TCM selects a suitable driving mode from the ten kinds for the variety
driving condition.
1) Normal mode
2) Power mode
3) 3rd start mode
4) HOT mode
5) L4 mode
6) Up slope1 mode
7) Up slope2 mode
8) Down slope mode
9) Auto cruise mode
10) W arm up mode • The priority of driving mode
Normal < Power < Up slope1 < Up slope2 < Down slope < L4 < W arm up < Auto
cruise < 3rd start < HOT
Oil temperature compensation
control If the ATF temperature exceeds 130
°C (266 °F), the TCM selects the HOT mode
shift pattern for lock-up, thus preventing the oil temperature from rising. (The HOT
mode is released, if the ATF temperature is less than 115 °C /239 °F.)
3rd start mode control By selecting 3rd start mode, the vehicle starting can be controls smoothly on low
frictional road like a snowy or muddy.
1. Enable condition a) The gear select position is "D" only.
b) Vehicle speed is less than 11km/h (7mph).
c) Transmission oil temperature is less than 120 °C (248 °F).
d) Accelerator opening is less than 8%.
e) Except 3rd start mode.
2. Disable condition a) Turning off the 3rd start mode switch
b) Shifting select position to "3", "2", or "L"(3rd start mode is not canceled b
y
selecting "N", "R", or "P")
c) Ignition key is turned off.
d) Vehicle speed is more than 35km/h (22mph).
L4 mode control The TCM detects whether the transfer is engaged in high or low based on L4 switch
signal, and selects the "Shift-map".

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-13
Item Description
Reverse lock out control If the select lever is moved to "R" position during forward driving, the TCM prohibits
reverse driving by turn off the S1 and turn on the S2 for prevention of danger and
protection of the automatic transmission.
1. Enable condition a) Vehicle speed is more than 11km/h (7mph).
2. Disable condition a) Vehicle speed is less than 9km/h (6mph).
b) W hen except "R" position is detected.
Auto cruise mode control If the auto cruise control can’t keep the setting speed like a uphill driving, the TCM selects the auto cruise mode shift pattern for downshifting, thus keeping the vehicle
speed.
W arm-up mode control TCM selects the warm-up mode shift pattern in engine cold condition for improvement of drivability and facilitation of warm-up.
Squat control W hen the TCM detects N→D garage shift, the TCM controls 1-3-1 shift by setting
timer, in order to improve the shift feel at N →D.
Coast down control The TCM switches to the coast down control at the coasting, in order to reduce the
roughness of shifting.
Uphill control W hen the TCM detected uphill, the TCM automatically switches to the uphill mode
in two-stage in proportion to inclination pitch to prevent the busy shifting and to
obtain an enough torque.
Downhill control W hen the TCM detected downhill, the TCM automatically switches to the downhill
mode, and shifts to the 3rd or keeps in the 3rd in order to prevent the vehicle
acceleration. Then, the brake load is reduced by a moderate engine brake and fuel
consumption is improved by the fuel cut.
Line pressure control The TCM controls the impressed current of the pressure control solenoid based on the throttle opening, and regulates suitable throttle pressure.
Engine truque management
control The TCM controls engine torque for improvement of shift quality or durability under
the following conditions.
• Upshift and downshift
• Garageshift
Indicate driving mode function The TCM indicates the following driving mode on instrument panel.
• Power mode
• 3rd start mode
Indicate oil temperature
warning function If the transmission oil temperature sensor senses that transmission oil temperature
is greater than 146 °C (295 °F) , the TCM turns on ATF warning lamp. (The warning
lamp is turned off, if oil temperature is less than 126 °C/ 259 °F .)
Fail-safe function W hen trouble occurs to vehicle sensor and each solenoid, TCM automatically exerts
fail-safe control not to spoil driveability.
• This control is exerted when sensor or actuator is in trouble, while TCM works
normally.
• The "CHECK TRANS" light flashes to alert the driver, and the transmission
must be manually shifted as follows.

Select lever position Gear position
D 4 (Fourth)
3 4 (Fourth)
2 3 (Third)
L 3 (Third)
R Reverse
Shift are firmer to prevent clutch slip and consequent wear. The fault should be
corrected as soon as possible.

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ISUZU KB P190 2007

7A2-24 TRANSMISSION CONTROL SYSTEM (AW30–40LE)
TRANSMISSION DATA
Scan Tool Parameter Units Displayed Typical Data Value at Engine Idle
Operating Conditions: Engine idling/ Engine coolant temperature is between 75 to 85 °C(167 to 185 °F)/
Accelerator pedal is constant/ Neutral or Park/ Accessories OFF/ Vehicle located at sea level
Engine Coolant temperature °C/ °F 75 to 85°C (167 to 185 °F)
Engine Speed RPM 700
Vehicle Speed Km/h / MPH 0
Ignition Voltage V 13.6
Accelerator Pedal Position Signal % 0
Throttle Position % 0
Accelerator Pedal Position Signal
During Cruise Control % 0
Cruise Control
Inactive / Active Inactive
Cruise Control OD Cancel Request ON / OFF OFF
Engine W arm Up Cycle Achieved FALSE / TRUE FALSE
Transmission Shift in Progress Inactive / Active Inactive
Garage Shift Control Inactive / Active Inactive
MIL Request Command ON / OFF OFF
Transmission Check Light ON / OFF OFF
Transmission Oil Temperature Lamp ON / OFF OFF
Power Drive Lamp ON / OFF OFF
3rd Start Lamp ON / OFF OFF
Transmission Fluid Temperature
°C/ °F 70 to 80°C (158 to 176 °F)
AT Input Speed RPM 625
AT Output Speed RPM 0
Transmission Range Park / Reverse /
Neutral / Drive 4 / Drive 3 / Drive 2 / Drive 1 Park
TR Switch P
ON / OFF ON
TR Switch R ON / OFF OFF
TR Switch N ON / OFF OFF
TR Switch D ON / OFF OFF
TR Switch 3 ON / OFF OFF
TR Switch 2 ON / OFF OFF
TR Switch L ON / OFF OFF
Diagnostic Switch Open / Close Open
Brake Pedal Switch ON / OFF OFF
Power Drive Switch ON / OFF OFF
3rd Start Switch ON / OFF OFF
4 W heel Drive Low ON / OFF OFF
Shift Solenoid 1 Command ON / OFF ON
Shift Solenoid 2 Command ON / OFF OFF
TCC Solenoid Engaged / Disengaged Disengaged
Downhill Mode Inactive / Active Inactive
Active Shift Mode Normal Mode /
Power Mode /
3rd Gear Start /
Transfer 4L MODE Hot 1 / Hot 2 /
UPHILL MODE 1 /
UPHILL MODE 2 / Cruise MODE /
W arm Up MODE Normal Mode
Estimated Gear Ratio
:1 7.97 : 1

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TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-113

(2) All of the following conditions are met.
• Device Control is not operating.
• Disable Normal Communication is receiving
enable.
• DTC Clear is not operating.

The following condition at ignition “OFF” form “ON” is
detected seven times in total in 1 cycle.
• Receiving BUS “OFF” information from CAN
controller.
Action Taken When The DTC Set
• Throttle judgment on torque reduction control, line
pressure control at stationary status, line pressure
reduction control at gear change and line pressure
reduction control at garage. (Throttle opening 100%)
• Line pressure FULL output.
• Throttle judgment on gear change control. (Throttle
opening 0%)
• No line pressure reduction control at gear change.
• No torque reduction control.
• No squat control.
• No slope control.
• No L-up control.
• Control Engine rpm at 7000rpm. (No inertia
calculation)
• Control actual torque at MAX.
• Control driver torque at MAX.
• Control engine coolant temperature at 80 °C (176 °F).
• No coast control.
• No 3rd Start mode control.
• No line pressure reduction control at garage.
• No output revolution sensor failure detection.
• No input revolution sensor failure detection.
• No selector position switch failure detection.
• No oil temperature sensor failure detection.
• No T/F Hi-Low SW failure detection.
• No speed mater signal failure detection.
• No throttle signal failure detection.
• No Engine torque signal failure detection.
• No engine coolant temperature signal failure
detection.
• No Engine revolution signal failure detection.
• No shift solenoid functional failure detection.
• No L-up solenoid functional failure detection.
• No DTC U2105 failure detection.
• Cancel engine rpm condition of prerequisite of suppl
y
voltage failure detection.
• Control vehicle speed of speed meter at 0km/h.
• No torque reduction at stall.
• No cruise control.
• No warm up control.
• DTC stored.
• Check Trans “ON”.
• 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.
• W hen diagnosing for a possible intermittent short o
r
open condition, move the wiring harness while
observing test equipment for a change.
• Inspect the wiring for EMI (Electro-Magnetic
Interference). Check that all wires are properly routed
away from coil, and generator. Also check fo
r
improperly installed electrical options. W hen this test
is performed, turn “OFF” on electronic auto parts
switches to improperly for a noise preventing.


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