Isuzu KB P190. Manual — part 957

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–42

Action Taken When the DTC Sets

•

The TCM requests the ECM to illuminate the MIL.

•

The TCM allows the vehicle to operate in transmission protection mode.

•

The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM stores this
information as a Failure Record.

•

The ECM records the operating conditions when the conditions for setting the DTC are met. The ECM stores this
information as a Freeze Frame.

Conditions for Clearing the DTC

•

The ECM turns off the MIL after the third 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 an 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:

2

DTC P0602 indicates the TCM is not programmed.

DTC P0601 to P0604 or P1621 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.

3

On Tech 2 select:
Transmission / Automatic Transmission / Diagnostic
Trouble Codes / Read DTC Information.

Has DTC P0602 set?

Go to Step 3

Go to Step 4

3

1

On Tech 2 select:
Diagnostic Trouble Codes / Clear Engine & Transmission
DTCs

2

Follow the instructions on Tech 2 and clear any DTCs.

3

Program the TCM, refer to 7C4 Automatic Transmission –
4L60E – On-vehicle Servicing.

4

On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.

Has DTC P0602 set?

Go to Step 4

Go to Step 5

4

Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Servicing.

Did you complete the replacement?

Go to Step 5

—

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–43

Step Action

Yes

No

5

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

Start the engine.

4

On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.

Have any of the DTCs in this procedure set?

Go to Step 2

Go to Step 6

6

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.

4.13 DTC P0711 to P0713 – Transmission

Fluid Temperature Sensor

DTC Description

This diagnostic procedure supports the following DTCs:

•

DTC P0711 – Transmission Fluid Temperature (TFT) Sensor Performance,

•

DTC P0712 – Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage, and

•

DTC P0713 – Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage.

Circuit Description

The automatic transmission fluid temperature (TFT) sensor is part of the automatic transmission fluid pressure (TFP)
manual valve position switch. The automatic TFT sensor is a negative coefficient thermistor. The transmission control
module (TCM) supplies a 5 volt reference signal to the sensor and measures the voltage drop in the circuit. When the
transmission fluid is cold, the sensor resistance is high and the TCM detects high signal voltage. As the fluid temperature
increases, the resistance of the sensor decreases, which lowers the signal voltage. This diagnostic monitors the TFT
circuit. The circuit may be functional, but not in the normal operating range. This diagnostic indicates stuck, erratic,
intermittent, skewed, or inaccurate values, indicating poor system performance. The TFT range is -40 – 151°C.

Refer to 2

Wiring Diagrams and Connector Chart to aid in diagnosis.

Conditions for Running the DTC

DTC P0711

•

No DTC P0117, P0118, P0722 or P0723.

•

DTC P0711 has not passed in the current ignition cycle.

•

The engine run time is greater than 5 seconds.

•

The transmission fluid temperature is -39 – 149°C.

•

For conditions 1 and 2 in Conditions for Setting the DTC, the engine coolant temperature is greater than 70°C and
has changed by at least 50°C since start-up.

•

For conditions 1 and 2 in Conditions for Setting the DTC, the TCC slip speed is 120 r.p.m. or greater for
600 seconds (10 minutes) cumulatively.

DTC P0712

The engine run time is greater than 5 seconds.

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–44

DTC P0713

•

No DTCs P0722, P0723.

•

The output shaft speed is greater than 200 r.p.m. for 200 seconds (3 minutes and 20 seconds) cumulative.

•

The TCC slip speed is greater than 120 r.p.m. for 200 seconds (3 minutes and 20 seconds) cumulative.

•

The engine run time is greater than 5 seconds.

Conditions for Setting the DTC

DTC P0711

One of the following conditions occurs:

Condition 1

•

The transmission fluid temperature at start-up is -40 – 21°C.

•

The vehicle speed is greater than 8 km/h for 900 seconds (15 minutes) cumulatively.

•

The transmission fluid temperature has not changed by more than 2°C since start-up for 100 seconds (1 minute
and 40 seconds).

Condition 2

•

The transmission fluid temperature at start-up is 129 – 150°C.

•

The vehicle speed is greater than 8 km/h for 600 seconds (10 minutes) cumulatively.

•

The transmission fluid temperature has not changed by more than 2°C since start-up for 100 seconds (1 minute
and 40 seconds).

Condition 3

The transmission fluid temperature has changed by 20°C or greater within 250 milliseconds and it has done this 14 times
within 7 seconds.

DTC P0712

The TCM detects a transmission fluid temperature of 150°C or more for 2 seconds.

DTC P0713

The TCM detects a transmission fluid temperature of -39°C or less for 25 seconds.

Action Taken When the DTC Sets

•

The TCM does not request the engine control module (ECM) to illuminate the MIL.

•

The TCM freezes transmission adaptive functions.

•

The TCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air
temperature and engine run time.

•

The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM stores this
information as a Failure Record.

•

The TCM stores the DTC in TCM history.

Conditions for Clearing the DTC

•

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 fault no longer exists and the DTC passes.

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–45

Diagnostic Aids

•

Tech 2 displays the transmission fluid temperature in degrees. After the transmission is operating, the fluid
temperature should rise steadily to a normal operating temperature, then stabilise.

•

Verify the customer's driving habits, trailer towing, etc. Trailer towing should occur in D3.

Test Description

The following numbers refer to the step numbers in the diagnostic table:

3

Checks the hardware components that affect the transmission fluid temperature.

4

Checks there is power supplied to the TFT sensor.

5

Checks the TFT sensor high reference circuit for serviceability.

6

Check the TFT sensor for serviceability.

7

Checks the TFT sensor low reference circuit for serviceability.

DTC P0711 to P0713 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:
Data Display / Transmission Data

8

Drive the vehicle and observe Tech 2 for either of the following
conditions:

•

The Trans. Fluid Temp. does not change more than
2.25°C in 409 seconds since start-up

•

The Trans. Fluid Temp. changes more than 20°C in
200 milliseconds 14 times within 7 seconds

•

The Trans. Fluid Temp. less than -39°C?

Does Tech 2 display any of the above conditions?

Go to Step 4

Go to Step 3