Isuzu N-Series. Manual - part 917

 

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Isuzu N-Series. Manual - part 917

 

 

Transmission Control System (Smoother) 7A-123

4

1. Test the signal circuit between the

transmission control module (TCM) (pins 7, 8,
13, 14 & 15 of B-427 and pin 21 of B-428
connector) and the selector lever switch (pin 2,
4, 6, 7, 8 and 10 of N-19 connector) for a short
to ground. 

2. Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 8

Go to Step 7

5

1. Test the signal circuit on the selector lever

switch (pin 2, 4, 6, 7, 8 and 10 of N-19
connector) and ground (pin 9 of N-19
connector) for a short each other.

2. Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 8

Go to Step 6

6

Repair or replace the selector lever. Refer to
Selector Lever Replacement in this section. 

Did you complete the replacement?

—

Go to Step 8

—

7

Important:
Replacement TCM must be programmed and
learned.
Replace the TCM. Refer to Transmission Control
Module (TCM) Replacement in this section.

Did you complete the replacement?

—

Go to Step 8

—

8

1. Reconnect all previously disconnected

harness connector(s).

2. Clear the DTCs with the Tech 2.
3. Turn OFF the ignition for 30 seconds.
4. Turn ON the ignition, with the engine OFF.
5. Operate the selector lever while observing the

Selector N, R, D, A, + and 

− Switch parameter

with the Tech 2. 

Notice:
The Selector D Switch parameter indicates ON
when the selector lever is A, + or 

−.

Does each selector lever switch parameter display
ON when it moved to its position and display OFF
when it moved to other positions?

—

Go to Step 9

Go to Step 3

9

Observe the DTC Information with the Tech 2. 

Are there any DTCs that you have not diagnosed?

—

Go to Diagnostic 

Trouble Code (DTC) 

List

System OK

Step

Action

Value(s)

Yes

No

7A-124 Transmission Control System (Smoother)

P0907 (Flash Code 51)

Circuit Description
The selector lever switches are installed to the selector
lever bracket and there are two switches. The forward
and backward direction switch detects the selector lever
forward and backward movement. The horizontal
direction switch detects the selector lever horizontal
movement. When the selector lever is positioned N, D or
R, each selector lever switch is closed and the switch
signal from the transmission control module (TCM) is
pulled to ground. When the selector lever is positioned
A, + or 

−, each selector lever switch and D switch are

also closed and the switch signal from the TCM is pulled
to ground. If the TCM detects the selector lever N, D and
R switch input signals are OFF (open circuit) at the
same time, this DTC will set.
Condition for Running the DTC

• The ignition switch is ON.
• The ignition voltage is more than 20 volts.
• The emergency switch is OFF.

Condition for Setting the DTC

• The TCM detects that the selector lever N, D and

R switch signals are OFF (open circuit) at the same
time. 

Action Taken When the DTC Sets

• The TCM does not illuminate the transmission

warning lamp when the diagnostic runs and fails. 

• The TCM inhibits gear select & shift position

learning and half-clutch learning.

Condition for Clearing the DTC

• A current DTC clears when the diagnostic runs and

does not fail.

• A history 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.

• Ensure each selector lever switch is tight and not

damaged.

Notice:

• Engine will not crank if the selector lever N switch

signal is OFF (open circuit).

DTC P0907 (Flash Code 51)

Schematic Reference: Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or Transmission Control
Module (TCM) Connector End Views

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 the Tech 2.
2. Turn ON the ignition, with the engine OFF.
3. Operate the selector lever while observing the

Selector N, R, D, A, + and 

− Switch parameter

with the Tech 2. 

Notice:
The Selector D Switch parameter indicates ON
when the selector lever is A, + or 

−.

Does each selector lever switch parameter display
ON when it moved to its position and display OFF
when it moved to other positions?

—

Go to Diagnostic 

Aids

Go to Step 3

3

1. Turn OFF the ignition.
2. Remove the selector lever cover.
3. Disconnect the selector lever switch harness

connector.

4. Connect a DMM between the signal circuit

(pins 2, 6 and 7 of N-19 connector which ever
parameter reading did not display ON at Step
2) and a known good ground. 

5. Turn ON the ignition, with the engine OFF.

Is the DMM voltage more than the specified value?

18.0 volts

Go to Step 5

Go to Step 4

Transmission Control System (Smoother) 7A-125

4

1. Test the signal circuit between the

transmission control module (TCM) (pin 13 &
14 of B-427 and pin 21 of B-428 connector)
and the selector lever switch (pin 2, 6 and 7 of
N-19 connector) for an open circuit or high
resistance.

2. Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 10

Go to Step 8

5

1. Turn OFF the ignition.
2. Disconnect the selector lever switch harness

connector.

3. Inspect for an intermittent and for poor

connections at the harness connector of the
selector lever (pins 2, 6, 7 and 9 of N-19
connector).

4. Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 10

Go to Step 6

6

1. Test the ground circuit between the selector

lever switch (pin 9 of N-19 connector) and the
chassis ground (B-1) for an open circuit or high
resistance.

2. Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 10

Go to Step 7

7

Repair or replace the selector lever. Refer to
Selector Lever Replacement in this section. 

Did you complete the replacement?

—

Go to Step 10

—

8

1. Turn OFF the ignition.
2. Disconnect the TCM harness connector.
3. Inspect for an intermittent and for poor

connections on the selector lever switch
circuits at the harness connector of the TCM
(pins 13 & 14 of B-427 and pin 21 of B-428
connector).

4. Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 10

Go to Step 9

9

Important:
Replacement TCM must be programmed and
learned.
Replace the TCM. Refer to Transmission Control
Module (TCM) Replacement in this section.

Did you complete the replacement?

—

Go to Step 10

—

Step

Action

Value(s)

Yes

No

7A-126 Transmission Control System (Smoother)

10

1. Reconnect all previously disconnected

harness connector(s).

2. Clear the DTCs with the Tech 2.
3. Turn OFF the ignition for 30 seconds.
4. Turn ON the ignition, with the engine OFF.
5. Operate the selector lever while observing the

Selector N, R, D, A, + and 

− Switch parameter

with the Tech 2. 

Notice:
The Selector D Switch parameter indicates ON
when the selector lever is A, + or 

−.

Does each selector lever switch parameter display
ON when it moved to its position and display OFF
when it moved to other positions?

—

Go to Step 11

Go to Step 3

11

Observe the DTC Information with the Tech 2. 

Are there any DTCs that you have not diagnosed?

—

Go to Diagnostic 

Trouble Code (DTC) 

List

System OK

Step

Action

Value(s)

Yes

No

 

 

 

 

 

 

 

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