2002 ISUZU AXIOM ECU

7A1±60
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0751 Shift Solenoid A Performance (Stuck Off)
D07RT011
Circuit Description
The shift solenoid A is used to control fluid flow acting on
the 1±2 and 3±4 shift valves. The solenoid is a normally
close exhaust valve that is used with the shift solenoid B
to allow four different shifting combinations.
The DTC detects when there is only a 1±1±4±4 shift
pattern depending on the state of the mechanical failure
instead of a 1±2±3±4 shift pattern. This is a type ªBº DTC.
Conditions For Setting The DTC

No ETC DTCs.

No OSS DTCs P0722 or P0723.

No TCC solenoid DTCs P0742, P1860, P1870.

No shift solenoid A DTC P0753.

No shift solenoid B DTC P0758.

Gear range is D4.

Transmission temperature is between 20
and 130
C
(68
and 266
F).

Output speed is greater than 375 rpm.

No range code P0705, P0706.

No torque code (to be confirmed).

Engine run for more 0 seconds and not influed cut-off
(to be confirmed).
All the above conditions have been met and the
combination of conditions 1, 2 occur two consecutive
times.
Condition 1:

2nd gear is commanded for . 1 second.

40 3 Engine Torque 3 400 N´m

Speed ratio . 0.6

Throttle position . 10 %

800 3 TCC Slip 3 4000 rpm

2.75 3 Modeled Ratio 3 3.2 for 1 second.
Condition 2:

3rd gear is commanded for . 1 second.

40 3 Engine Torque 3 400 N´m

Throttle position . 10 %

±8000 3 TCC Slip 3 8000 rpm

Speed ratio . 0.45

0.62 3 Modeled Ratio 3 0.92 for 3 second.
Action Taken When the DTC Sets

Maximum line pressure.

For lamp illuminate refer to
DTC type definition (type
B).

Turn Force Motor OFF.
Conditions For Clearing The The MIL/DTC

The PCM will turn off the MIL and 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

Verify that the transmission meets the specifications
in the 4L30±E shift speed chart.

Other internal transmission failures may cause more
than one shift to occur.

7A1±62
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0752 Shift Solenoid A Performance (Stuck On)
D07RT011
Circuit Description
The shift solenoid A is used to control fluid flow acting on
the 1±2 and 3±4 shift valves. The solenoid is a normally
close exhaust valve that is used with the shift solenoid B
to allow four different shifting combinations.
The DTC detects when there is only a 2±2±3±3 shift
pattern depending on the state of the mechanical failure
instead of a 1±2±3±4 shift pattern. This is a type ªBº DTC.
Conditions For Setting The DTC

No ETC DTCs.

No OSS DTCs P0722 or P0723.

No TCC solenoid DTC P0742, P1860, P1870.

No shift solenoid A DTC P0753.

No shift solenoid B DTC P0758.

Gear range is D4.

Output speed is greater than 375 rpm.

Transmission temperature is between 20
and 130
C
(68
and 266
F).

No range code P0705, P0706.

No torque code (to be confirmed).

Engine run for more 0 seconds and not influed cut-off
(to be confirmed).
All the above conditions have been met and the
combination of condition 1, 2 occur two consecutive
times.
Condition 1:

1st gear is commanded for . 1 sec

40 3 Engine Torque 3 400 N´m

Throttle positon . 10%

±8000 3 TCC slip 3 8000 rpm

Transmission out speed . 375 rpm

Speed ratio . 0.3

1.5 3 Modeled Ratio 3 2.4 for 0.687 seconds
Condition 2:

4th Gear is commanded for . 1 sec.

40 3 Engine Torque 3 400 N´m

Trottle position . 10%

±8000 3 TCC slip 3 8000 rpm

Speed ratio . 0.6

0.92 3 Modeled Ratio 3 1.5 for 7 seconds
Action Taken When the DTC Sets

Maximum line pressure.

For lamp illuminate refer to
DTC type definition (type
B).

Turn Force Motor OFF.
Conditions For Clearing The The MIL/DTC

The PCM will turn off the MIL and 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

Verify that the transmission meets the specifications
in the 4L30±E shift speed chart.

Other internal transmission failures may cause more
than one shift to occur.

7A1±64
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0753 Shift Solenoid A Electrical
D07R200010
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 a 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 ªBº 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 0.84 ± 1.0 seconds.
Action Taken When The DTC Sets

Maximum line pressure.

Immediate landing to 4th gear.

Inhibit TCC engagement.

For lamp illuminate refer to
DTC type definition (type
B).
Conditions For Clearing The MIL/DTC

The PCM will turn off the MIL and 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 7-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±67
DTC P0756 Shift Solenoid B Performance (Stuck Off)
D07RT011
Circuit Description
The shift solenoid B is used to control fluid flow acting on
the 2±3 shift valves. The solenoid is a normally open
exhaust valve that is used with the shift solenoid A to allow
four different shift combinations.
This DTC detects when there is only a 4-3-3-4 shift
pattern depending on the state of the mechanical failure
instead of a 1-2-3-4 shift pattern. This is a type ªBº DTC.
Conditions For Setting The DTC

No ETC DTCs.

No OSS DTCs P0722 or P0723.

No TCC solenoid DTCs P0742, P1860, P1870.

No shift solenoid DTCs P0753, P0758.

Gear range is D4.

Output speed is greater than 375 rpm.

Transmission fluid temperature is between 20
and
130
C (68
and 266
F).

No range code P0705, P0706.

No torque code (to be confirmed).

Engine run for more 0 seconds and influed cut-off (to
be confirmed).
All the above conditions have been met and the
combination of condition 1, 2 occur two consecutive
times.
Condition 1:

1st gear is commanded for . 1 second

40 3 Engine Torque 3 400 N´m

Throttle position . 10 %

±2300 3 TCC Slip 3 200 rpm.

Transmission output speed . 400 rpm

Speed ratio . 0.3

0.60 3 Modeled Ratio 3 1.49 for 1 second.
Condition 2:

2nd gear is commanded for . 1 second

40 3 Engine Torque 3 400 N´m

Throttle position . 10 %

±8000 3 TCC Slip 3 8000 rpm.

Speed ratio . 0.6

0.92 3 Modeled Ratio 3 1.5 for 0.687 second.
Action Taken When the DTC Sets

Maximum line pressure.

For lamp illuminate refer to
DTC type definition (type
B).

Turn Force Motor OFF.
Conditions For Clearing The MIL/DTC

The PCM will turn off the MIL and 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

Verify that the transmission meets the specifications
in the 4L30-E shift speed chart.

Other internal transmission failures may allow more
than one shift to occur.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±69
DTC P0757 Shift Solenoid B Performance (Stuck On)
D07RT011
Circuit Description
The shift solenoid B is used to control fluid flow acting on
the 2±3 shift valves. The solenoid is a normally open
exhaust valve that is used with the shift solenoid A to allow
four different shift combinations.
This DTC detects when there is only a 1±2±2±1 shift
pattern depending on the state of the mechanical failure
instead of a 1±2±3±4 shift pattern. This is a type ªBº DTC.
Conditions For Setting The DTC

No ETC DTCs.

No OSS DTCs P0722 or P0723.

No TCC solenoid DTC P0742, P1860, P1870.

No shift solenoid A DTCs P0753.

No shift solenoid B DTC P0758.

Gear range is D4.

Output speed is greater than 375 rpm.

Transmission fluid temperature is between 20
and
130
C (68
and 266
F).

No range code P0705, P0706.

No torque code (to be confirmed).

Engine run for more 0 seconds and not influed cut-off
(to be confirmed).
All of the above conditions have been met and the
combination of condition 1,2 occur two consecutive
times.
Condition 1:

3rd gear is commanded for . 1 second

40 3 Engine Torque 3 400 N´m

Throttle positon . 10%

±8000 3 TCC slip 3 8000 rpm

Transmission out speed . 375 rpm

Speed ratio . 0.6

1.44 3 Modeled Ratio 3 2.4 for 4 seconds
Condition 2:

4th Gear is commanded for . 1 second

15 3 Engine Torque 3 400 N´m

Trottle position . 10%

±8000 3 TCC slip 3 8000 rpm

Speed ratio . 0.6

2.75 3 Modeled Ratio 3 3.2 for 2 seconds
Action Taken When the DTC Sets

Maximum line pressure.

For lamp illuminate refer to
DTC type definition (type
B).

Turn Force Motor OFF.
Conditions For Clearing The MIL/DTC

The PCM will turn off the MIL and 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

Verify that the transmission meets the specifications
in the 4L30-E shift speed chart.

Other internal transmission failures may cause more
than one shift to occur.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±71
DTC P0758 Shift Solenoid B Electrical
D07R200010
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
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. 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 ªBº 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 0.84 ~ 1.0 seconds.
Action Taken When The DTC Sets

Fixed to 4th gear.

Maximum line pressure.

Inhibit TCC engagement.

For lamp illuminate refer to
DTC type definition (type
B).
Conditions For Clearing The MIL/DTC

The PCM will turn off the MIL and 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 transmission 7-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±79
DTC P1860 TCC PWM Solenoid Electrical
D07R200011
Circuit Description
The PCM allows current to flow through the solenoid coil
according to the duty cycle (percentage of ªonº and ªoffº
time). This current flow through the solenoid coil creates
a magnetic field that magnetizes the solid core. The
magnetized core attracts the check ball to seat against
spring pressure. This blocks the exhaust for the TCC
signal fluid and allows 2±3 drive fluid to feed to TCC signal
circuit.The TCC signal fluid pressure acts on the TCC
regulator valve to regulate line pressure and to apply fluid
pressure to the torque converter clutch shift control valve.
When the TCC shift valve is in the apply position,
regulated apply fluid pressure is directed through the TCC
valve to apply the torque converter clutch. The TCC
PWM solenoid is used in conjunction with the TCC PWM
solenoid to regulate fluid to the torque converter. The
TCC PWM solenoid is attached to the valve body within
the transmission.
This DTC detects a continuous open or short to ground or
ignition in the TCC circuit or the TCC PWM solenoid. This
is a type ªBº DTC.
Conditions For Setting The DTC

Battery voltage is between 10 and 16 volts.

No shift solenoid A DTCs P0751 or P0752 or P0753.

No shift solenoid B DTCs P0756 or P0757 or P0758.

Ignition is ªonº, Engine ªrunº.

The PCM commands the solenoid ªonº and the
voltage remains low (zero volts).

The PCM commands the solenoid ªoffº and the
voltage remains high (B+).

All conditions met for 0.875 ~ 1.25 seconds.
Action Taken When The DTC Sets

Inhibit TCC engagement.
For lamp illuminate refer to
DTC type definition (type
B).
Conditions For Clearing The MIL/DTC

The PCM will turn off the MIL and 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 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.

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 chart
:
3. This test checks for voltage to the solenoid.
4. This test checks the ability of the PCM and wiring to
control the ignition circuit.
9. This test checks the resistance of the TCC solenoid
and the internal wiring harness.

7A1±82
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P1870 Transmission Component Slipping (TCC Stuck Off)
D07R200008
Circuit Description
The PCM monitors the difference in engine speed and
transmission output speed. For example in D3 drive
range with the ECCC commanded, the engine speed
should closely match transmission output speed.
This DTC detects excessive TCC slip when the ECCC is
engaged. This is a type ªBº DTC.
Conditions For Setting The DTC
The following conditions are met for three TCC cycles
with reported excessive TCC slip conditions.

No OSS DTCs P0722 or P0723.

No shift solenoid A DTCs P0751 or P0752 or P0753.

No shift solenoid B DTCs P0756 or P0757 or P0758.

No TCC solenoid DTCs P0742 or P1860 or P1870.

Engine speed is between 1,000 and 3,500 rpm for 0.5
seconds.

Gear range is D4.

13% < TPS < 99%

50 < Engine Torque < 300 N´m

TFT is between 20
and 150
C (68
and 302
F).

TCC slip speed is between 250 rpm and 800 rpm for 3
times 7 seconds.

Vehicle speed is between 25 km/h (15 mph) and 225
km/h (158 mph).

Speed ratio is between 0.6 and 0.95.

ECCC is ªONº.
Low (0.8) < TCC Capacity < hi (0.99) for 5 seconds
Action Taken When The DTC Sets

Only stored in memory.

For lamp illuminate refer to
DTC type definition (type
B).
Conditions For Clearing The MIL/DTC

The PCM will turn off the MIL and 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 exist and the ignition is cycled ªoffº
long enough to power down the PCM.
Diagnostic Aids

Range switch malfunction could set a DTC P1870.

A mechanical failure of the shift solenoids, TCC
solenoid, or TCC PWM solenoid could set a DTC
P1870.

Internal transmission failures may set a DTC P1870.

An intermittent or incorrect engine speed signal may
set a DTC P1870.