2007 ISUZU KB P190 Harness

7A2-34 TRANSMISSION CONTROL SYSTEM (JR405E)
61. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine and let idle.
5. Load the electrical system by turning ON the headlights, A/C, etc. while observing the DTC
Information with a scan tool.
Did the DTC fail this ignition? —
Go to Step 3 Go to Step 7
7 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

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ISUZU KB P190 2007

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

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-37
5Connect 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

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ISUZU KB P190 2007

7A2-38 TRANSMISSION CONTROL SYSTEM (JR405E)
10Repair 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

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-39
161. 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

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-41
41. Turn OFF the ignition.
2. Disconnect the in-line harness connector (E- 54) near the transmission range switch.
3. Turn ON the ignition, with the engine OFF.
Is the TFT parameter less than the specified value? -40
°C (-40 °F)
Go to Step 14 Go to Step 5
5 1. Test the signal circuit between the TCM (pin 4
of C-95) and the in-line harness connector (pin
2 of E-54) for the following conditions:
• A short to ground
• A short to the low reference circuit
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 18 Go to Step 6
6 1. Turn OFF the ignition.
2. Disconnect the TCM harness connector.
3. Inspect connections at the harness connector of the TCM (pins 4 and 14 of C-95) for
corrosion.
4. Repair or clean the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 18 Go to Step 17
7 1. Turn OFF the ignition.
2. Disconnect the in-line harness connector (E- 54) near the transmission range switch.
3. Connect a DMM between the signal circuit (pin 2 of E-54) and a known good ground.
4. Turn ON the ignition, with the engine OFF.
Is the DMM voltage more than the specified value? 2.8 volts
Go to Step 8 Go to Step 9
8 Important:
The TFT sensor may be damaged if the
sensor signal circuit is shorted to a voltage source.
1. Test the signal circuit between the TCM (pin 4 of C-95) and the in-line harness connector (pin
2 of E-54) for the following conditions:
• A short to battery or ignition voltage
• A short to any 5 volts reference
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 18 Go to Step 17
9 Connect a 3-amp fused jumper wire between the
signal circuit and the low reference circuit (pins 2
and 8 of E-54).
Is the TFT parameter more than the specified
value? 146
°C (295 °F)
Go to Step 13 Go to Step 10
10 Connect a 3-amp fused jumper wire between the
signal circuit (pin 2 of E-54) and a known good
ground.
Is the TFT parameter more than the specified
value? 146
°C (295 °F)
Go to Step 12 Go to Step 11
Step
Action Value(s)Yes No

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ISUZU KB P190 2007

7A2-42 TRANSMISSION CONTROL SYSTEM (JR405E)
111. Test the signal circuit between the TCM (pin 4
of C-95) and the in-line harness connector (pin
2 of E-54) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 18 Go to Step 15
12 1. Test the low reference circuit between the
TCM (pin 14 of C-95) and the in-line harness
connector (pin 8 of E-54) for an open circuit or
high resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 18 Go to Step 15
13 1. Inspect for an intermittent and for poor
connections at the in-line harness connector
(pins 2 and 8 of E-54).
2. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 18 Go to Step 14
14 1. Remove the transmission oil pan. Refer to
repair instructions (On-Vehicle Service).
2. Test the signal circuit between the TFT sensor and the in-line harness connector (pin 2 of E-
54) for the following conditions:
• An open circuit
• A short to ground
• A short to the low reference circuit
• A short to the solenoid valve circuit
• High resistance
3. Test the low reference circuit between the TFT sensor and the in-line harness connector (pin
8 of E-54) for an open circuit or high
resistance.
4. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 18 Go to Step 16
15 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 4 and 14 of C-95).
4. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 18 Go to Step 17
16 Replace the TFT sensor. Refer to repair
instructions (On-Vehicle Service). (TFT sensor is
part of the harness assembly)
Did you complete the replacement? —
Go to Step 18 —
17 Important:
Replacement TCM must be
programmed.
Replace the TCM. Refer to TCM Replacement.
Did you complete the replacement? —
Go to Step 18 —
Step
Action Value(s)Yes No

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-43
181. Reconnect all previously disconnected
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 2 Go to Step 19
19 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

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TO MODEL INDEX
ISUZU KB P190 2007