Isuzu KB P190. Manual - part 1080

7A2-36   TRANSMISSION CONTROL SYSTEM (JR405E)

DTC P0705 (Flash Code 17)

Circuit Description

The transmission range (TR) switch is connected to the
transmission manual shaft and installed externally to
the transmission case. The TR switch relays a signal to
the TCM indicating transmission range position by
detecting ignition voltage through an internal switch.
Only one of the seven internal switches will close for
each P, R, N, D, 3, 2 and L position. Normally, the TCM
expects to detect one high voltage input for each
position. If the TCM detects more than one high voltage
input at the same time or no input, this DTC will set. 

Condition for Running the DTC

• The ignition switch is ON. 

Condition for Setting the DTC

Either of following condition is met:

• The TCM detects that the TR switch signals are all

OFF for 2 seconds when the engine speed is more
than 500 RPM.

• The TCM detects that multiple TR switch signals

for 1 second.   

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.

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

Circuit/ System Testing DTC P0705

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 ON the ignition, with the engine OFF.

3.

Observe the Transmission Range (TR) Switch
P, R, N, D, 3, 2 and L parameter with a scan
tool while selecting each transmission range.

Does the scan tool indicate ON when its position
and OFF when other positions?

—

Go to Diagnostic 

Aids

Go to Step 3

3

1.

Check to ensure the TR switch is adjusted
correctly.

2.

Adjust the TR switch as necessary. Refer to
repair instructions (On-Vehicle Service). 

Did you find and correct the condition?

—

Go to Step 16

Go to Step 4

4

1.

Turn OFF the ignition.

2.

Disconnect the TR switch harness connector. 

3.

Turn ON the ignition, with the engine OFF.

Does the scan tool indicate all TR Switch
parameters OFF?

—

Go to Step 5

Go to Step 11

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-37

5

Connect a test lamp between the ignition voltage
feed circuit to the TR switch (pin 3 of E-51) and a
known good ground.

Does the test lamp illuminate?

—

Go to Step 7

Go to Step 6

6

Repair the open circuit or high resistance between
the Back Up (15A) fuse and the TR switch (pin 3 of
E-51). Check the Back Up (15A) fuse first.

Did you complete the repair?

—

Go to Step 16

—

7

Observe the ALL TR Switch parameter with a scan
tool while momentarily jumping 3-amp fused
jumper wire across the TR switch harness
connector.

• P range: Between 3 and 2 of E-51

• R range: Between 3 and 4 of E-51

• N range: Between 3 and 8 of E-51

• D range: Between 3 and 5 of E-51 

• 3 range: Between 3 and 1 of E-51

• 2 range: Between 3 and 9 of E-51

• L range: Between 3 and 6 of E-51

Does the scan tool indicate ON when the circuit is
jumpered and OFF when the circuit is not
jumpered?

—

Go to Step 8

Go to Step 9

8

Does the scan tool indicate multiple TR switch ON
at Step 7?

—

Go to Step 10

Go to Step 12

9

1.

Test the TR switch signal circuit (which ever
parameter reading did not ON at Step 7)
between the TCM and the TR switch for an
open circuit or high resistance. 

• P range: Between 2 of C-94 and 2 of E-

51

• R range: Between 19 of C-95 and 4 of E-

51

• N range: Between 10 of C-95 and 8 of E-

51

• D range: Between 11 of C-95 and 5 of E-

51 

• 3 range: Between 17 of C-94 and 1 of E-

51

• 2 range: Between 2 of C-95 and 9 of E-

51

• L range: Between 21 of C-95 and 6 of E-

51

2.

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 16

Go to Step 13

Step

Action

Value(s)

Yes

No

7A2-38   TRANSMISSION CONTROL SYSTEM (JR405E)

10

Repair the short circuit each other between the
TCM and the TR switch (which ever parameter
reading multiple TR switch ON at Step 7).

• P range: Between 2 of C-94 and 2 of E-51

• R range: Between 19 of C-95 and 4 of E-51

• N range: Between 10 of C-95 and 8 of E-51

• D range: Between 11 of C-95 and 5 of E-51 

• 3 range: Between 17 of C-94 and 1 of E-51

• 2 range: Between 2 of C-95 and 9 of E-51

• L range: Between 21 of C-95 and 6 of E-51

Did you complete the repair?

—

Go to Step 16

—

11

1.

Test the TR switch signal circuit (which ever
parameter reading did not OFF at Step 4)
between the TCM and the TR switch for a
short to battery or ignition voltage. 

• P range: Between 2 of C-94 and 2 of E-

51

• R range: Between 19 of C-95 and 4 of E-

51

• N range: Between 10 of C-95 and 8 of E-

51

• D range: Between 11 of C-95 and 5 of E-

51 

• 3 range: Between 17 of C-94 and 1 of E-

51

• 2 range: Between 2 of C-95 and 9 of E-

51

• L range: Between 21 of C-95 and 6 of E-

51

2.

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 16

Go to Step 15 

12

1.

Inspect for an intermittent and for poor
connections at the harness connector of the
TR switch (pins 1, 2, 3, 4, 5, 6, 8 and 9 of E-
51). 

2.

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 16

Go to Step 14

13

1.

Turn OFF the ignition. 

2.

Disconnect the TCM harness connector.

3.

Inspect for an intermittent and for poor
connections at the harness connector of the
TCM (pins 2 and 17 of C-94 and pins 2, 10,
11, 19 and 21 of C-95).

4.

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 16

Go to Step 15

14

Replace the TR switch. Refer to repair instructions
(On-Vehicle Service). 

Did you complete the replacement?

—

Go to Step 16

—

15

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

Did you complete the replacement?

—

Go to Step 16

—

Step

Action

Value(s)

Yes

No

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-39

16

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.

Turn ON the ignition, with the engine OFF.

5.

Observe the TR Switch P, R, N, D, 3, 2 and L
parameter with a scan tool while selecting
each transmission range.

Does the scan tool indicate ON when its position
and OFF when other positions?

—

Go to Step 17

Go to Step 3

17

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