2007 ISUZU KB P190 Workshop Repair Manual

air suspension climate settings fuel coolant reservoir fuel cap release ECO mode

Page 4353 of 6020

ISUZU KB P190 2007 Workshop Repair Manual TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-69
101. Remove the transmission oil pan. Refer to
repair instructions (On-Vehicle Service).
2. Inspect the low clutch solenoid valve for the following condi

Page 4354 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 7A2-70 TRANSMISSION CONTROL SYSTEM (JR405E)
DTC P1120 (Flash Code 22)
Circuit Description
The accelerator pedal position (APP) sensor is
mounted on the accelerator pedal control assembly.
The anal

7A2-70 TRANSMISSION CONTROL SYSTEM (JR405E)
DTC P1120 (Flash Code 22)
Circuit Description
The accelerator pedal position (APP) sensor is
mounted on the accelerator pedal control assembly.
The analogue APP signals are converted by the engine
control module (ECM) into a pulse width modulation
(PWM) signal. This converted signal is continually sent
from the ECM to the TCM to determine appropriate
shift points depending on the accelerator pedal
pressing amount. If the TCM fails to receive a PWM
signal from the ECM, this DTC will set.
Condition for Running the DTC • The ignition switch is ON.
Condition for Setting the DTC • The TCM detects that the APP PWM signal from the ECM is not being received.
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.
Circuit/ System Testing DTC P1120
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. Start the engine.
4. Monitor the ENGINE DTC Information with a scan tool.
Is DTC P2621 or P2622 set? —
Go to Applicable DTC in engine
control section Go to Diagnostic
Aids

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TO MODEL INDEX
ISUZU KB P190 2007

Page 4355 of 6020

ISUZU KB P190 2007 Workshop Repair Manual TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-71
DTC P1750 (Flash Code 51)
Circuit Description
The low & reverse brake transmission fluid pressure
(TFP) switch is installed to the lower part of the val

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-71
DTC P1750 (Flash Code 51)
Circuit Description
The low & reverse brake transmission fluid pressure
(TFP) switch is installed to the lower part of the valve
body assembly and it feedbacks fluid pressure in the
low & reverse brake hydraulic circuit. The low & reverse
brake fail-safe spool valves are installed to the control
valve body assembly and it uses to prevent interlocking
of clutches and brakes. When the solenoid valve is
energized, fluid pressure is drained to disengage the
low & reverse brake and the TFP switch is OFF. When
the solenoid valve is not energized, fluid pressure is
applied to engage the low & reverse brake and the TFP
switch is ON. The TCM monitors the low & reverse
brake TFP switch ON/ OFF status through the signal
circuit. If the TCM detects an improper status on the
signal circuit, this DTC will set.
Condition for Running the DTC • The ignition switch is ON.
Condition for Setting the DTC • The TCM detects that the low & reverse brake TFP switch signal repeats OFF/ ON twice when the
selector lever in forward range with the 2nd, 3rd or
4th gear.
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 fixes to the 3rd gear.
Condition for Clearing the DTC • The TCM turns OFF the Check Trans lamp when the diagnostic runs and does not fail at next
ignition cycle.
• A current DTC clears when the diagnostic runs and does not fail at next ignition cycle.
Diagnostic Aids • If an intermittent condition is suspected, refer to Intermittent Conditions in this section.
• Use the Clutch, Brake, Solenoid and Pressure Switch Logic table to verify each component works
properly within the selected gear range.
• A sticking or intermittently sticking the low & reverse brake solenoid valve will cause this DTC to
set.
Schematic Reference: Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or TCM Connector End
Views
Circuit/ System Testing DTC P1750
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 while observing the DTC Information with a
scan tool.
Is DTC P0753 or P1853 also set? —
Go to Applicable DTC Go to Step 3
3 Place the selector lever in forward range while
observing the Low & Reverse Brake Pressure
Switch parameter with a scan tool.
Does the Low & Reverse Brake Pressure Switch
parameter ever indicate ON when gear is shifted
between 1st and 4th? —
Go to Step 4 Go to Diagnostic
Aids

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TO MODEL INDEX
ISUZU KB P190 2007

Page 4356 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 7A2-72 TRANSMISSION CONTROL SYSTEM (JR405E)
41. Remove the transmission oil pan. Refer to
repair instructions (On-Vehicle Service).
2. Inspect the low & reverse brake solenoid valve and transmissio

Page 4357 of 6020

ISUZU KB P190 2007 Workshop Repair Manual TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-73
DTC P1755 (Flash Code 52)
Circuit Description
The 2-4 brake transmission fluid pressure (TFP) switch
is installed to the lower part of the valve body as

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-73
DTC P1755 (Flash Code 52)
Circuit Description
The 2-4 brake transmission fluid pressure (TFP) switch
is installed to the lower part of the valve body assembly
and it feedbacks fluid pressure in the 2-4 brake
hydraulic circuit. The low & reverse brake fail-safe
spool valves are installed to the control valve body
assembly and it uses to prevent interlocking of clutches
and brakes. When the solenoid valve is energized, fluid
pressure is drained to disengage the 2-4 brake and the
TFP switch is OFF. When the solenoid valve is not
energized, fluid pressure is applied to engage the 2-4
brake and the TFP switch is ON. The TCM monitors the
2-4 brake TFP switch ON/ OFF status through the
signal circuit. If the TCM detects an improper status on
the signal circuit, this DTC will set.
Condition for Running the DTC • The ignition switch is ON.
Condition for Setting the DTC • The TCM detects that the 2-4 brake TFP switch signal repeats OFF/ ON twice when the selector
lever in forward range with the 3rd gear.
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 fixes to the 3rd gear.
Condition for Clearing the DTC • The TCM turns OFF the Check Trans lamp when the diagnostic runs and does not fail at next
ignition cycle.
• A current DTC clears when the diagnostic runs and does not fail at next ignition cycle.
Diagnostic Aids • If an intermittent condition is suspected, refer to Intermittent Conditions in this section.
• Use the Clutch, Brake, Solenoid and Pressure Switch Logic table to verify each component works
properly within the selected gear range.
• A sticking or intermittently sticking the 2-4 brake solenoid valve will cause this DTC to set.
Schematic Reference: Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or TCM Connector End
Views
Circuit/ System Testing DTC P1755
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 while observing the DTC Information with a
scan tool.
Is DTC P0758or P1858 also set? —
Go to Applicable DTC Go to Step 3
3 Place the selector lever in forward range while
observing the 2-4 Brake Pressure Switch
parameter with a scan tool.
Does the 2-4 Brake Pressure Switch parameter
ever indicate ON when gear is positioned 1st and
3rd? —
Go to Step 4 Go to Diagnostic
Aids

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TO MODEL INDEX
ISUZU KB P190 2007

Page 4358 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 7A2-74 TRANSMISSION CONTROL SYSTEM (JR405E)
41. Remove the transmission oil pan. Refer to
repair instructions (On-Vehicle Service).
2. Inspect the 2-4 brake solenoid valve and transmission fluid pr

Page 4359 of 6020

ISUZU KB P190 2007 Workshop Repair Manual TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-75
DTC P1853 (Flash Code 26)
Circuit Description
The low & reverse brake transmission fluid pressure
(TFP) switch is installed to the lower part of the val

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-75
DTC P1853 (Flash Code 26)
Circuit Description
The low & reverse brake transmission fluid pressure
(TFP) switch is installed to the lower part of the valve
body assembly and it feedbacks fluid pressure in the
low & reverse brake hydraulic circuit. When the
solenoid valve is energized, fluid pressure is drained to
disengage the low & reverse brake and the TFP switch
is OFF. When the solenoid valve is not energized, fluid
pressure is applied to engage the low & reverse brake
and the TFP switch is ON. The TCM monitors the low &
reverse brake TFP switch ON/ OFF status through the
signal circuit. If the TCM detects an improper status on
the signal circuit, this DTC will set.
Condition for Running the DTC • DTCs P0560, P0705, P0717, P0722, P0753, P0758, P0763, P0768, P1120, P1750, P1755 and
P1875 are not set.
AND following conditions are met for longer than 2.5
seconds.
• The ignition switch is ON.
• The transmission fluid temperature is more than 60 °C (140 °F).
• The engine speed is more than 500 RPM.
• The TCM is not under gearshift control.
Condition for Setting the DTC
Either of following condition is met: • The TCM detects that the low & reverse brake TFP switch signal is stuck at the ON for longer than 2
seconds when the selector lever in D range with
4th gear. • The TCM detects that the low & reverse brake TFP
switch signal is stuck at the OFF for longer than 2
second when the selector lever in R range.
Action Taken When the DTC Sets • The TCM blinks the Check Trans lamp when the diagnostic runs and fails.
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.
• Use the Clutch, Brake, Solenoid and Pressure Switch Logic table to verify each component works
properly within the selected gear range.
• A sticking or intermittently sticking the low & reverse brake solenoid valve will cause this DTC to
set.
Schematic Reference: Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or TCM Connector End
Views
Circuit/ System Testing DTC P1853
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 while observing the DTC Information with a
scan tool.
Is DTC P0753 also set? —
Go to DTC P0753 Go to Step 3
3 Place the selector lever in forward range while
observing the Low & Reverse Brake Pressure
Switch parameter with a scan tool.
Does the Low & Reverse Brake Pressure Switch
parameter ever indicate ON when gear is shifted
between 1st and 4th? —
Go to Step 5 Go to Step 4

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TO MODEL INDEX
ISUZU KB P190 2007

Page 4360 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 7A2-76 TRANSMISSION CONTROL SYSTEM (JR405E)
4Place the selector lever in R range while observing
the Low & Reverse Brake Pressure Switch
parameter with a scan tool.
Does the Low & Reverse Brake Pr

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