1998 ISUZU TROOPER ECO mode

7A1±52
TRANSMISSION CONTROL SYSTEM (4L30±E)
Conditions For Clearing The DTC/CHECK
TRANS Lamp

The PCM will turn ªoffº the CHECK TRANS Lamp
after three consecutive ignition cycles without a
failure reported.

The DTC can be cleared from PCM memory by using
a scan tool.

The DTC can also be cleared from memory when the
vehicle has made 40 warmup cycles without a failure
reported.

The PCM will cancel the DTC Actions Taken items
when the fault conditions no longer exist and the
ignition is cycles ªoffº long enough to power down the
PCM.
Diagnostic Aids

Check for intermittent output speed sensor circuit
problems.

Check for possible incorrect calibration. (PCM part
No., tire specification, and rear axle ratio)
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
3. This step checks for possible low fluid level causing
slipping resulting in an undefined gear ratio.
4. This step checks for correct gear ratios for
commanded gears.
5. This step checks for low line pressure.
DTC P0730 Transmission Incorrect Gear Ratio
StepActionYe sNo
1Visually inspect the transmission cooling system for fluid leaks.

Refer to Chart 16: Possible Causes of Transmission Fluid
Leaks of Mechanical/Hydraulic Diagnosis Symptoms Index in
Automatic Transmission (4L30±E) section
Was condition found and corrected?
Go to Step 6Go to Step 2
2Refer to Checking Transmission Fluid Level and Condition in
Automatic Transmission (4L30±E) section.
Has transmission fluid checking procedure been performed?
Go to Step 3
Go to Checking
Transmission
Fluid Level and
Condition in
Automatic
Transmission
(4L30±E) section
31. Install the scan tool.
2. Turn the ignition switch to the ªonº position.
3. Engine not running.
NOTE: Before clearing DTC(s) use the scan tool to record the
ªFailure Recordsº for reference, as data will be lost when the ªClear
Infoº function is used.
4. Record the Failure Record data.
5. Use the scan tool snapshot mode to record transmission gear
ratios.
6. Drive vehicle in transmission gear ranges 1, 2, 3, and D with
the engine speed is greater than 3,500 rpm for 5.5 seconds.
7. Record each transmission gear.
1st:2.73 ± 2.99
2nd:1.54 ± 1.71
3rd:0.93 ± 1.05
4th:0.66 ± 0.78
Does commanded gear ratio match ranges as shown?
Refer to
Diagnostic Aids
Go to Step 4
4Perform line pressure check.

Refer to Line Pressure Test in Automatic Transmission
(4L30±E) section.
Was condition found and corrected?
Go to Step 6Go to Step 5

7A1±56
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0753 Shift Solenoid A Electrical
D07RW009
Circuit Description

The shift solenoid A is a simple on/off solenoid
located in the main case valve body. The solenoid is
the normally closed type. In second or third gear, the
Powertrain Control Module (PCM) energizes the
solenoid to open a fluid inlet port. When the port is
open, fluid pressure actuates the shift valve.

The solenoid is activated by current. This current is
produced by applying a voltage to one side (the High
side) and a ground to the other side (Low side).

The High Side Driver (HSD) is a circuit of the PCM
that acts as a switch between the solenoids and the
supply voltage. The High side of the solenoid is
permanently supplied with voltage, except in
BACKUP MODE or when ignition is off the HSD is
turned off.
This DTC detects a continuous open or short to ground in
the shift solenoid A circuit or the shift solenoid A. This is a
type ªCº DTC.
Conditions For Setting The DTC

Ignition is ªonº, Engine ªrunº.

Battery voltage is between 10 and 16 volts.

The PCM commands the solenoid ªonº and the
voltage remains high (B+) or the PCM commands the
solenoid ªoffº and the voltage remains low (zero
volts).

All conditions met for 0.33 seconds.
Action Taken When The DTC Sets

Maximum line pressure.

Immediate landing to 4th gear.

Inhibit TCC engagement.

The PCM will illuminate the CHECK TRANS Lamp.
Conditions For Clearing The MIL/DTC

The PCM will turn off the CHECK TRANS Lamp after
three consecutive ignition cycles without a failure
reported.

The DTC can be cleared from the PCM history by
using a scan tool.

The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.

The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled ªoffº
long enough to power down the PCM.
Diagnostic Aids

Inspect the wiring for poor electrical connection at the
PCM and at the transmission 16±way connector.
Look for possible bent, backed out, deformed or
damaged terminals. Check for weak terminal tension
as well. Also check for a chafed wire that could short
to bare metal or other wiring. Inspect for a broken wire
inside the insulation.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±59
DTC P0758 Shift Solenoid B Electrical
D07RW009
Circuit Description

The shift solenoid B is a simple on/off solenoid
located in the main case valve body. It is normally
open. When the port is open, fluid pressure actuates
the shift valve. In first or second gear, the Powertrain
Control Module (PCM) energizes the solenoid to
close a fluid inlet port.

The solenoid is activated by current. This current is
procuded by applying a voltage to one side (the High
side) and a ground to the other side (Low side).

The High Side Driver (HSD) is a circuit of the PCM
that acts as a switch between the solenoids and the
supply voltage. The High side of the solenoid is
permanently supplied with voltage. In BACKUP
MODE or when the ignition is off, the HSD is turned
off.
This DTC detects a continuous open or short to ground in
the shift solenoid B circuit or shift solenoid B. This is a
type ªCº DTC.
Conditions For Setting The DTC

Ignition is ªonº, Engine ªrunº.

Battery voltage is between 10 and 16 volts.

The PCM commands the solenoid ªonº and the
voltage remains high (B+)or the PCM commands the
solenoid ªoffº and the voltage remains low (zero
volts).

All conditions met for 0.33 seconds.
Action Taken When The DTC Sets

Fixed to 4th gear.

Maximum line pressure.

Inhibit TCC engagement.

The PCM will illuminate the CHECK TRANS Lamp.
Conditions For Clearing The MIL/DTC

The PCM will turn off the CHECK TRANS Lamp after
three consecutive ignition cycles without a failure
reported.

The DTC can be cleared from the PCM history by
using a scan tool.

The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.

The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled ªoffº
long enough to power down the PCM.
Diagnostic Aids

Inspect the wiring for poor electrical connections at
the PCM and at the transmission 16±way connector.
Look for possible bent, backed out, deformed or
damaged terminals. Check for weak terminal tension
as well. Also check for a chafed wire that could short
to bare metal or other wiring. Inspect for a broken wire
inside the insulation.

7A1±60
TRANSMISSION CONTROL SYSTEM (4L30±E)

When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
Test Description
The numbers below refer to the step numbers on the
diagnostic char:
5. This test measures the resistance of the component.
7. This test checks the function of the shift solenoid B
and the transmission internal wiring harness.
11.This test checks for power to the shift solenoid B
from the ignition through the PCM.Shift Solenoid Status Chart
Gear
Shift solenoid AShift solenoid B
1stOFFON
2ndONON
3rdONOFF
4thOFFOFF
DTC P0758 Shift Solenoid B Electrical
StepActionYe sNo
11. Install the scan tool.
2. With the engine ªonº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFailure
Recordsº for reference, as data will be lost when the ªClear Infoº
function is used.
3. Record the DTC ªFailure Recordsº.
Were DTCs P0753, P0758, P1860 set?
Go to Step 3Go to Step 2
21. The engine ªonº.
2. Apply brake pedal and select transmission range ªDº.
3. Press and hold down the winter switch and select transmission
mode ªwinterº.
Does the scan tool display DTC P0758 at 3rd gear?
Go to Step 7
Go to Diagnostic
Aids
31. Turn the ignition ªoffº.
2. Disconnect the J2 (WHITE) and J3 (BLUE) PCM connectors.
3. Turn the ignition ªonº.
4. Using the J39200 DVOM, measure the voltage between PCM
connector terminals J2±C2 and J2±C8.
Is the voltage within 10 ± 12 volts?
Go to Step 14Go to Step 4
41. Turn the ignition ªoffº.
2. Using the J39200 DVOM, measure the resistance between
PCM connector terminals J2±C2 and J3±E14.
Is the resistance within 18 ± 20 ohms?
Go to Step 15Go to Step 5
51. Disconnect the transmission 16±way connector H±53.
2. Using the J39200 DVOM, measure the resistance between
terminals H53±16 and H53±15.
Is the resistance within 18 ± 20 ohms?
Go to Step 16Go to Step 6
61. Disconnect the transmission main case connector M±7.
2. Using the J39200 DVOM, measure the resistance between
terminals M7±1(A) and M7±4(C).
Is the resistance within 18 ± 20 ohms?
Go to Step 17Go to Step 18
71. Turn the ignition ªoffº.
2. Disconnect the J2 (WHITE) and J3 (BLUE) PCM connectors.
3. Using the J39200 DVOM, measure the resistance between
PCM connector terminals J2±C2 and J3±E14.
Is the resistance within 18 ± 20 ohms?
Go to Step 8Go to Step 9
8Using the J39200 DVOM, check a continuity between PCM
connector terminal J2±C2 and ground.
Is there a continuity?
Go to Step 19Go to Step 10

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±65
DTC P1835 Kickdown Switch Always On
D07RW033
Circuit Description

When the driver presses the accelerator pedal down
fully, the kickdown switch closes, sending a ground
signal to the Powertrain Control Module (PCM).

This information is used to perform shifts at high
engine speed.

When the kickdown switch is closed, the Throttle
Position Sensor (TPS) is already is at 100%.

This DTC detects a closed kickdown switch when TP
angle is less than 70%.

This is a type ªDº DTC.
Conditions For Setting The DTC

No TPS DTCs P0122 or P0123.

TP angle is less than 70%.

Kickdown switch is ªonº.

All conditions met for 1 second.
Action Taken When The DTC Sets.

Kickdown mode control is off.

The PCM will not illuminate the CHECK TRANS
Lamp.
Conditions For Clearing The DTC

The DTC can be cleared from the PCM history by
using a scan tool.

The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.

The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled ªoffº
long enough to power down the PCM.
Diagnostic Aids

Check the wiring harness for a short to ground
between the PCM and kickdown switch.

Check the kickdown switch for failure.

Check kickdown adjustment.
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
2. This test checks for short to ground or kickdown
switch failure.
4. This test checks for regulation kickdown switch.

7A1±66
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P1835 Kickdown Switch Always On
StepActionYe sNo
11. Install the scan tool.
2. With the engine ªonº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFailure
Recordsº for reference, as data will be lost when the ªClear Infoº
function is used.
3. Record the DTC ªFailure Recordsº.
Does the scan tool display ªKickdown switchº ªlowº (closed
switch)?
Go to Step 2Go to Step 3
21. Turn the ignition ªoffº.
2. Disconnect the J3 (BLUE) PCM connector.
3. Using the J39200 DVOM, check a continuity between PCM
connector terminal J3±F11 and ground.
Is there a continuity?
Go to Step 4Go to Step 7
3The TP angle goes from 0% to 100% with the accelerator pedal
depressed.
Is the kickdown switch ªonº when TP angle is below 70%?
Go to Step 5
Go to Diagnostic
Aids
41. Disconnect the kickdown switch connector B±10.
2. Using the J39200 DVOM, check a continuity between
terminals B10±1 and B10±2.
Is there a continuity?
Go to Step 6Go to Step 8
5Adjust the kickdown switch.
Is the kickdown switch ªonº when TP angle is above 95%?
Go to Step 9Ð
6Replace the kickdown switch.
Is the replacement complete?
Go to Step 9Ð
7Replace the PCM. Refer to Powertrain Control Module (PCM) in
Automatic Transmission (4L30±E) section.
Is the replacement complete?
Go to Step 9Ð
8Repair the short to ground in circuit LT BLUE.
Is the repair complete?
Go to Step 9Ð
91. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and ensure the following condition is
met:
The torque converter stator temperature switch circuit does not
indicate a hot mode when the transmission fluid temperature is
less than 60
C (140
F) for at least 5 seconds.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table

8DÐ272 WIRING SYSTEM
General Description
The circuit consists of cruise control unit, cruise
main switch, combination switch, clutch switch
(M/T), mode switch (A/T), brake switch, actuator and
indicator lights.
Cruise control system keeps the vehicle running at a
fixed speed until a signal canceling this fixed speed
is received.
When the cruise main switch is turned on with the
vehicle in the running mode, the battery voltage is
applied to the control unit.
When a signal from the combination switch is input
to the control unit while vehicle is in this state, the
actuator is activated to operate the system. Also,
while the system is operating, the cruise indicator
light in the meter panel lights up.
Set Function
When the cruise main switch turned on and the set
switch is depressed with the vehicle speed within
the set limit and cancel operation is refused, the
vehicle speed when the set switch is released is
stored in the control unit as the set speed. But in
case of the vehicle speed is over maximum limit
speed of cruise control, maximum limit speed in the
control unit is stored as the set speed.
Resume Function
Unless the vehicle speed falls below the minimum
speed limit after canceling the set speed by the
cancel switch, pushing the resume switch causes
the vehicle to resume the speed before cancellation.
Acceleration Function
During cruise control driving, pushing the
acceleration switch (on time is more than 0.6 sec.)
causes an increase in cruise speed and vehicle
accelerates at a controlled rate untill acceleration
switch released.
Vehicle speed at the acceleration switch released
plus 1.0 km/h is stored in the control unit as the set
speed.
Tap up Function
During cruise control driving, pushing the coast
switch (on time is more than 0.6 sec.) causes a
decrease in cruise speed and the vehicle decelerate
at a controlled rate until coast switch released.
Vehicle speed at the coast switch released minus
approx. 1.0 km/h is stored in the control unit as the
set speed.
Tap down Function
During cruise control driving, the set speed can be
lowered approx. 1.0 km/h each time by operating
the coast switch quickly within 0.6 sec.
Cancel Function
During cruise control driving, the cruise control is
released if the control unit receives a signal from the
cancel switch, mode switch, clutch switch or brake
switch. The set speed is still stored.
Down Cancel Function
The cruise control is canceled when the vehicle
speed becomes the set speed minus 20 km/h during
the cruise control working and the set speed is
erased.
Over Drive (OD) Cancel Function
OD cancel function is required when the vehicle
speed becomes the set speed minus 3 km/h during
the cruise control working.
OD cancel function is enabled when the acceleration
function and/or resume function are working except
the vehicle speed is in more than 120 km/h.
Cruise Control

WIRING SYSTEM 8D – 373
Diagnosis
Quick Chart for Check Points
2.Mirrors on both sides do not operate
3.Mirror on the left (or right) side does
not operate
4.Mirrors on both sides operate only in
the vertical (or horizontal) direction
5.Mirror on the left side operates only
in the vertical (or horizontal) direction
6.Mirror on the right side operates only
in the vertical (or horizontal) direction
7.Folding mechanism of the both
mirrors does not operate
8.Folding mechanism of the mirror on
the left (or right) side does not operate
9.Mirror defoggers on both sides do not
operate
Mirror defogger on the left (or right)
side does not operateControl
switch
Folding
switch
Defogger
switchC-4
(10A)
C-11
(10A) SWLH RHTrouble modeCheck pointDoor mirror Door mirror SW
Cable
harness
1.
Fuse
Defogger Folding Control