Isuzu KB P190. Manual - part 1082

7A2-44 TRANSMISSION CONTROL SYSTEM (JR405E)

DTC P0717 (Flash Code 14)

Circuit Description

The input shaft speed (ISS) sensor is located on right-
hand of the transmission case. The ISS sensor is a hall
effect element type sensor, which generates a square
wave signal pulse based on the reverse & high clutch
drum rotational speed (32 pulses per a rotation of the
reverse & high clutch drum). The sensor has the
following circuits.

• Ignition voltage feed circuit

• Low reference circuit

• ISS sensor signal circuit

The TCM calculates the turbine speed by the ISS
sensor signal, and uses it to calculate torque converter
slip speed and gear ratio. If the TCM detects
excessively low input shaft speed during the vehicle
running, this DTC will set.

Condition for Running the DTC

• The ignition switch is ON.

• The engine speed is more than 1500 RPM.

• The vehicle speed is more than 40 km/h (24 MPH).

• The selector lever is forward range.

Condition for Setting the DTC

• The TCM detects that the input shaft speed is less

than 300 RPM for 2 seconds.

Action Taken When the DTC Sets

• The TCM blinks the Check Trans lamp when the

diagnostic runs and fails.

During the vehicle running;

• The TCM holds the last gear position when the

diagnostic runs and fails.

• The TCM inhibits lock up control.

After the vehicle stopped;

• The TCM stops all shift solenoid valves and fixes

to the 3rd gear.

• The TCM stops PC solenoid valve.

Condition for Clearing the DTC

• The TCM turns OFF the Check Trans lamp when

the diagnostic runs and does not fail.

• A current DTC clears when the diagnostic runs and

does not fail.

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

• Electromagnetic interference in the ISS sensor

circuits may set this DTC.

• An intermittent ISS sensor signal pulse may set

this DTC.

• Ensure the ISS sensor is tight.

Schematic Reference: Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or TCM Connector End
Views

Circuit/ System Testing DTC P0717

Step

Action

Value(s)

Yes

Did you perform the Diagnostic System Check -
Transmission Controls?

—

Go to Step 2

Go to Diagnostic

System Check -

Transmission

Controls

Install a scan tool.

Turn OFF the ignition for 30 seconds.

Lift the driving wheels or drive the vehicle.

Operate the vehicle within the Conditions for
Running the DTC.

Monitor the DTC Information with a scan tool.

Does the DTC fail this ignition?

—

Go to Step 3

Go to Diagnostic

Aids

Turn OFF the ignition.

Disconnect the input shaft speed (ISS) sensor
harness connector.

Turn ON the ignition, with the engine OFF.

Connect a test lamp between the ignition
voltage feed circuit (pin 2 of E-31) and a
known good ground.

Does the test lamp illuminate?

—

Go to Step 4

Go to Step 6

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-45

Intermittently jump the signal circuit (pin 1 of E-31)
with a test lamp that is connected to a known good
ground while observing the AT Input Speed
parameter with a scan tool.

Does the scan tool indicate any AT input speed
when the circuit is intermittently pulled to ground?

—

Go to Step 5

Go to Step 8

Connect a test lamp between the ignition voltage
feed circuit and the low reference circuit (pins 2 and
3 of E-31).

Does the test lamp illuminate?

—

Go to Step 9

Go to Step 7

Repair the open circuit or high resistance between
the Back Up (15A) fuse and the ISS sensor (pin 2
of E-31). Check the Back Up (15A) fuse first.

Did you complete the repair?

—

Go to Step 14

—

Repair the open circuit or high resistance on the
low reference circuit between the ISS sensor (pin 3
of E-31) and the engine ground terminal (E-10).
Clean or tighten ground as necessary.

Did you complete the repair?

—

Go to Step 14

—

Test the signal circuit between the TCM (pin 3
of C-95) and the ISS sensor (pin 1 of E-31) for
the following conditions

• An open circuit

• A short to ground

• A short to the low reference

• A short to battery or ignition voltage

• High resistance

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 14

Go to Step 10

Inspect for an intermittent and for poor
connections at the harness connector of the
ISS sensor (pin 1, 2 and 3 of E-31).

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 14

Go to Step 11

Turn OFF the ignition.

Disconnect the TCM harness connector.

Inspect for an intermittent and for a poor
connection at the harness connector of the
TCM (pin 3 of C-95).

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 14

Go to Step 13

Step

Action

Value(s)

Yes

7A2-46 TRANSMISSION CONTROL SYSTEM (JR405E)

Inspect the ISS sensor and the reverse & high
clutch drum for the following conditions:

• Physical damage of sensor

• Loose or improper installation of sensor

• Excessive air gap

• Foreign material passing between sensor

and reverse & high clutch drum

• Physical damage of reverse & high clutch

drum

Repair or replace as necessary.

Did you find and correct the condition?

—

Go to Step 14

Go to Step 12

Replace the ISS sensor. Refer to repair instructions
(On-Vehicle Service).

Did you complete the replacement?

—

Go to Step 14

—

Important: Replacement TCM must be
programmed.
Replace the TCM. Refer to TCM Replacement.

Did you complete the replacement?

—

Go to Step 14

—

Reconnect all previously disconnected fuse,
components or harness connector(s).

Clear the DTCs with a scan tool.

Turn OFF the ignition for 30 seconds.

Start the engine.

Operate the vehicle within the Conditions for
Running the DTC.

Did the DTC fail this ignition?

—

Go to Step 3

Go to Step 15

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

Step

Action

Value(s)

Yes

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-47

DTC P0722 (Flash Code 11)

Circuit Description

The output shaft speed (OSS) sensor is located on
right-hand of the transmission case near the
transmission range switch. The OSS sensor is a hall
effect element type sensor, which generates a square
wave signal pulse based on the parking gear rotational
speed that is connected to output shaft (16 pulses per a
rotation of the parking gear). The sensor has the
following circuits.

• Ignition voltage feed circuit

• Low reference circuit

• OSS sensor signal circuit

The TCM calculates the vehicle speed by the OSS
sensor signal, and uses it to determine appropriate shift
points and calculate gear ratio. The 2WD vehicle
outputs the vehicle speed signal from the TCM to the
engine control module (ECM) and the vehicle speed
meter via output signal line. If the TCM detects
excessively low output shaft speed during the vehicle
running, this DTC will set.

Condition for Running the DTC

• The ignition switch is ON.

• The input shaft speed is more than 1000 RPM.

• The selector lever is forward range for longer than

25 seconds.

Condition for Setting the DTC

• The TCM detects that the vehicle speed is less

than 5 km/h (3 MPH) for 5 seconds.

Action Taken When the DTC Sets

• The TCM blinks the Check Trans lamp when the

diagnostic runs and fails.

During the vehicle running;

• The TCM holds the last gear position when the

diagnostic runs and fails.

• The TCM inhibits lock up control.

After the vehicle stopped;

• The TCM stops all shift solenoid valves and fixes

to the 3rd gear. If a fail-safe valve problem is
detected, the shift solenoid valves are not stopped
but gear is fixed to the 3rd gear.

• The TCM stops PC solenoid valve.

Condition for Clearing the DTC

• The TCM turns OFF the Check Trans lamp when

the diagnostic runs and does not fail.

• A current DTC clears when the diagnostic runs and

does not fail.

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

• Electromagnetic interference in the OSS sensor

circuits may set this DTC.

• An intermittent OSS sensor signal pulse may set

this DTC.

• Ensure the OSS sensor is tight.

Schematic Reference: Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or TCM Connector End
Views

Circuit/ System Testing DTC P0722

Step

Action

Value(s)

Yes

Did you perform the Diagnostic System Check -
Transmission Controls?

—

Go to Step 2

Go to Diagnostic

System Check -

Transmission

Controls

Drive the vehicle while observing the Vehicle
Speed parameter with a scan tool.

Does the scan tool indicate correct vehicle speed?

—

Go to Step 3

Go to Diagnostic

Aids

Turn OFF the ignition.

Disconnect the output shaft speed (OSS)
sensor harness connector.

Turn ON the ignition, with the engine OFF.

Connect a test lamp between the ignition
voltage feed circuit (pin 2 of E-30) and a
known good ground.

Does the test lamp illuminate?

—

Go to Step 4

Go to Step 6

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