2007 ISUZU KB P190 fuse

7A2-54 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

Step Action Value(s) YES NO
6 Measure the resistance of wire by the 5-8840-0285-0
DMM.
1. Turn “OFF” the ignition.
2. Disconnect the TCM connector.
3. Install a fused jumper wire between terminals E83-
1 and E83-2 on the transmission harness.

Does DMM indicate specified value? Less than
1
Ω
Go to Step 8 Go to Step 7
7 An open circuit between TCM from oil temperature
sensor.
Repair the harness.

Is the action complete ? — Go to
Step 9 —
8 Replace the TCM
Important: The replacement TCM must be
programmed. (Refer to SPS for procedure.)

Is the action complete? — Go to
Step 9 —
9 1. Reconnect all previously disconnected harness
connector(s).
2. Clear the DTCs with a scan tool.
3. Turn “OFF” the ignition.
4. Start the engine.
5. Operate the vehicle within the Conditions For Running the DTC. You may also operate the
vehicle within the conditions that you observed
from the Freeze Frame/ Failure Records.

Did the DTC fail this ignition? — Go to
Step 2 Go to Step 10
10 Observe the stored information, Capture Info with a
scan tool.

Are there any DTCs that you have not diagnosed? — Go
to
Diagnostic
Trouble Code (DTC) List Verify repair


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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-21
Diagnostic Information and Procedures
Diagnostic Starting Point - Transmission Controls
Begin the system diagnosis with Diagnostic System
Check - Transmission Controls. The Diagnostic System
Check - Transmission Controls will provide the
following information:
• The identification of the control modules which command the system.
• The ability of the control modules to communicate through the serial data circuit.
• The identification of any stored diagnostic trouble codes (DTCs) and the their statuses.
The use of the Diagnostic System Check -
Transmission Controls will identify the correct
procedure for diagnosing the system and where the
procedure is located. Reading Flash Diagnostic Trouble Codes (DTC)
The provision for communicating with the TCM is the
Data Link Connector (DLC). The DTC(s) stored in the
TCM memory can be read either through a hand-held
diagnostic scanner such as Tech 2 plugged into the
DLC or by counting the number of flashes of the
CHECK TRANS lamp when the diagnostic test terminal
of the DLC is grounded. The DLC terminal “11”
(diagnostic request) is pulled “Low” (grounded) by
jumped to DLC terminal “4”, which is a ground wire.
Once terminals “11” and “4” have been connected, turn
the ignition switch ON, with the engine OFF. The
CHECK TRANS lamp initially flashes 12. If more than
one DTC has been stored in the TCM's memory, the
DTCs will be output numerical order with each DTC
being displayed three times. All the stored DTCs are
flashed, then return 12 and continue to flash the DTC. If
no DTC exists, the CHECK TRANS flashes 12
continuously. The flash DTC display will continue as
long as the DLC is shorted.
Diagnostic Trouble Codes (DTC) Clear Method
If there is no scan tool, history DTCs can be cleared by
removing the ECM (B) (10A) fuse for at least 10
seconds with the ignition switch OFF.
Unit: second
131313323232121313133232321212
Example: DTC 13 stored
ON
OFF
Example: DTC 32 stored
Example: DTC 13 and 32 are stored
ON
OFF 3
1
0.40.40.40.4
32
0.40.40.40.40.4
2nd digit number1st digit number
3.23.20.40.40.41.2
2nd digit number 1st digit number
0.40.41.23.23.2

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ISUZU KB P190 2007

7A2-28 TRANSMISSION CONTROL SYSTEM (JR405E)
Scan Tool Does Not Power Up
Circuit Description
The data link connector (DLC) is a standardized 16-
cavity connector. Connector design and location is
dictated by an industry wide standard, and is required
to provide the following:
• Scan tool power battery positive voltage at terminal 16
• Scan tool power ground at terminal 4 • Common signal ground at terminal 5
The scan tool will power up with the ignition OFF. Some
modules however, will not communicate unless the
ignition is ON.
Schematic Reference: Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or TCM Connector End
Views
Circuit/ System Testing Scan Tool Does Not Power Up
Step Action Value(s)Yes No
1 Important:
Make sure the scan tool works properly
on another vehicle before using this chart.
1. Turn OFF the ignition.
2. Inspect the Meter (+B) (10A) fuse in the cabin fuse block.
Is the Meter (+B) (10A) fuse open? —
Go to Step 2 Go to Step 3
2 Replace the Meter (+B) (10A) fuse. If the fuse
continues to open, repair the short to ground on
one of the circuits that is fed by the Meter (+B)
(10A) fuse or replace the shorted attached
component.
Did you complete the repair? —
Go to Step 7 —
3 1. Check each circuit at the data link connector
(DLC) (B-58) for a backed out, spread or
missing terminal.
2. Repair the terminal as necessary.
Did you find and complete the repair? —
Go to Step 7 Go to Step 4
4 Connect a test lamp between the +B circuit (pin 16
of B-58) at the DLC and a known good ground.
Does the test lamp illuminate? —
Go to Step 6 Go to Step 5
5 Repair the open in the battery voltage circuit to the
DLC.
Did you complete the repair? —
Go to Step 7 —
6 1. Test each ground circuit at the DLC (pins 4
and 5 of B-58) for an open circuit or high
resistance.
2. Repair the circuit(s), clean or tighten ground as necessary.
Did you find and correct the condition? —
Go to Step 7 Go to Intermittent
Conditions
7 1. Connect the scan tool to the DLC.
2. Attempt to turn ON the scan tool.
Does the scan tool ON? —
System OK Go to Step 1

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-31
Lost Communication with The Transmission Control Module (TCM)
Circuit Description
The TCM, electronic hydraulic control unit (EHCU)
[ABS module] and supplemental restraint system
(SRS) control module all communicate with the scan
tool over the Keyword serial data link. Schematic Reference:
Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or TCM Connector End
Views
Circuit/ System Testing Lost Communication with The Transmission Control Module (TCM)
Step Action ActionYes No
1 Did you perform the Diagnostic System Check -
Engine Controls? —
Go to Step 2 Go to Diagnostic
System Check - Transmission
Controls
2 Attempt to establish communication with the TCM.
Does the scan tool communicate with the TCM? —
Go to Intermittent
Conditions Go to Step 3
3 1. Inspect for an intermittent, for poor
connections and for corrosion at the TCM C-
94 and C-95 harness connectors.
2. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 9 Go to Step 4
4 1. Check the TCM (15A) in the cabin fuse block.
Replace and retest if open. If any fuse
continues to open, repair the short to ground
on each circuit fed by that fuse.
2. Turn OFF the ignition.
3. Disconnect the TCM C-95 harness connector.
4. Turn ON the ignition, with the engine OFF.
5. Connect a test lamp to ground and check for voltage at the ignition voltage supply circuit at
the TCM (pins 18 and 24 of C-95).
Does the test lamp illuminate? —
Go to Step 6 Go to Step 5
5 Repair the open in the ignition voltage circuit to the
TCM.
Did you complete the repair? —
Go to Step 9 —
6 1. Turn OFF the ignition.
2. Disconnect the TCM C-94 harness connector.
3. Inspect for an intermittent, for poor connections and corrosion at the harness
connector of the TCM (pin 5 of C-94).
4. Test the Keyword serial data circuit between the TCM (pin 5 of C-94) and the DLC (pin 7 of
B-58) for an open circuit or high resistance.
5. Repair the connection(s) or circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 9 Go to Step 7
7 1. Check TCM ground for corrosion and
tightness.
2. Clean or tighten grounds as necessary.
Did you find and correct the condition? —
Go to Step 9 Go to Step 8

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ISUZU KB P190 2007

7A2-32 TRANSMISSION CONTROL SYSTEM (JR405E)
8Important:
Replacement TCM must be
programmed.
Replace the TCM. Refer to TCM Replacement.
Did you complete the replacement? —
Go to Step 9 —
9 1. Turn OFF the ignition.
2. Reconnect all previously disconnected fuse or harness connector(s).
3. Turn ON the ignition, with the engine OFF.
4. Attempt to establish communication with the TCM.
Does the scan tool communicate with the TCM? —
System OK Go to Step 3
Step
Action ActionYes No

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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

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