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
No
1
Did you perform the Diagnostic System Check -
Transmission Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Transmission
Controls
2
1.
Install a scan tool.
2.
Turn OFF the ignition for 30 seconds.
3.
Lift the driving wheels or drive the vehicle.
4.
Operate the vehicle within the Conditions for
Running the DTC.
5.
Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition?
—
Go to Step 3
Go to Diagnostic
Aids
3
1.
Turn OFF the ignition.
2.
Disconnect the input shaft speed (ISS) sensor
harness connector.
3.
Turn ON the ignition, with the engine OFF.
4.
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
4
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
5
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
6
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
—
7
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
—
8
1.
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
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 14
Go to Step 10
9
1.
Inspect for an intermittent and for poor
connections at the harness connector of the
ISS sensor (pin 1, 2 and 3 of E-31).
2.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 14
Go to Step 11
10
1.
Turn OFF the ignition.
2.
Disconnect the TCM harness connector.
3.
Inspect for an intermittent and for a poor
connection at the harness connector of the
TCM (pin 3 of C-95).
4.
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
No
7A2-46 TRANSMISSION CONTROL SYSTEM (JR405E)
11
1.
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
2.
Repair or replace as necessary.
Did you find and correct the condition?
—
Go to Step 14
Go to Step 12
12
Replace the ISS sensor. Refer to repair instructions
(On-Vehicle Service).
Did you complete the replacement?
—
Go to Step 14
—
13
Important: Replacement TCM must be
programmed.
Replace the TCM. Refer to TCM Replacement.
Did you complete the replacement?
—
Go to Step 14
—
14
1.
Reconnect all previously disconnected fuse,
components or harness connector(s).
2.
Clear the DTCs with a scan tool.
3.
Turn OFF the ignition for 30 seconds.
4.
Start the engine.
5.
Operate the vehicle within the Conditions for
Running the DTC.
Did the DTC fail this ignition?
—
Go to Step 3
Go to Step 15
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
No
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
No
1
Did you perform the Diagnostic System Check -
Transmission Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Transmission
Controls
2
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
3
1.
Turn OFF the ignition.
2.
Disconnect the output shaft speed (OSS)
sensor harness connector.
3.
Turn ON the ignition, with the engine OFF.
4.
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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