torque ISUZU AXIOM 2002 Service Repair Manual

7A1±42
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0719 Brake Switch Circuit Low (Stuck On)
D07R200007
Circuit Description:
The brake switch indicates brake pedal status to the
Powertrain Control Module (PCM). The brake switch is a
normally±closed switch that supplies battery voltage on
circuit BRN/RED to the PCM. Applying the brake pedal
opens the switch, interrupting voltage to the PCM. When
the brake pedal is released, the PCM receives a constant
voltage signal. If the PCM receives a zero voltage signal
at the brake switch input, and the Torque Converter
Clutch (TCC) is engaged, the PCM de±energizes the
Torque Converter Clutch Solenoid Valve (TCC Sol.
Valve). The PCM disregards the brake switch input for
TCC scheduling if there is a brake switch circuit fault
(Refer to
Diagnostic Aids).
When the PCM detects an open brake switch circuit (0
volts, low input) during accelerations, then DTC P0719
sets. DTC P0719 is a type D DTC.
Conditions For Setting The DTC

No OSS Assy. DTCs P0722 or P0723.

The PCM detects an open brake switch or circuit (0
volts) for 15 minutes without changing for 2 seconds,
and the following events occur seven consecutive
times.

The vehicle speed is less than 8 km/h (5 mph).

then the vehicle speed is 8±32 km/h (5±20 mph) for
4 seconds.

then the vehicle speed is greater than 32 km/h (20
mph) for 4 seconds.
Action Taken When The DTC Sets

The PCM does not illuminate the Malfunction
Indicator Lamp (MIL).

DTC P0719 stores in PCM history.
Conditions For Clearing The DTC

A scan tool can clear the DTC from the PCM history.
The PCM clears the DTC from the PCM history if the
vehicle completes 40 warm±up cycles without a
failure reported.

The PCM cancels the DTC default actions when the
fault no longer exists and the ignition is OFF long
enough in order to power down the PCM.
Diagnostic Aids

Inspect the wiring for poor electrical connections at
the PCM and brake switch. 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.

Check customer driving habits and/or unusual driving
conditions (i.e. stop and go, highway).

Check brake switch for proper mounting and
adjustment.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±51
DTC P0724 Brake Switch Circuit High (Stuck Off)
D07R200007
Circuit Description:
The brake switch indicates brake pedal status to the
Powertrain Control Module (PCM). The brake switch is a
normally±closed switch that supplies battery voltage on
circuit BRN/RED to the PCM. Applying the brake pedal
opens the switch, interrupting voltage to the PCM. When
the brake pedal is released, the PCM receives a constant
voltage signal. If the PCM receives a zero voltage signal
at the brake switch input, and the Torque Converter
Clutch (TCC) is engaged, the PCM de±energizes the
Torque Converter Clutch Solenoid Valve (TCC Sol.
Valve). The PCM disregards the brake switch input for
TCC scheduling if there is a brake switch circuit fault
(Refer to
Diagnostic Aids).
When the PCM detects a closed brake switch circuit (12
volts, high input) during decelerations, then DTC P0724
sets. DTC P0724 is a type D DTC.
Conditions For Setting The DTC

No OSS Assy. DTCs P0722 or P0723.

The PCM detects a closed brake switch circuit (12
volts) without changing and the following events
occur seven consecutive times.

The vehicle speed is greater than 32 km/h (20 mph)
for 4 seconds.

then the vehicle speed is between 8±32 km/h (5±20
mph) for 4 seconds.

then the vehicle speed is less than 8 km/h (5 mph).
Action Taken When The DTC Sets

The PCM does not illuminate the Malfunction
Indicator Lamp (MIL).

DTC P0724 stores in PCM history.
Conditions For Clearing The DTC

A scan tool can clear the DTC from the PCM history.
The PCM clears the DTC from the PCM history if the
vehicle completes 40 warm±up cycles without a
failure reported.

The PCM cancels the DTC default actions when the
fault no longer exists and the ignition is OFF long
enough in order to power down the PCM.
Diagnostic Aids

Inspect the wiring for poor electrical connection at the
PCM. 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.

Check customer driving habits and/or unusual traffic
conditions (i.e. stop and go, expressway).

Check brake switch for proper mounting and
adjustment.

7A1±56
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0742 Torque Converter Clutch (TCC) System Stuck On
D07R200008
Circuit Description
The PCM energizes the TCC solenoid by creating an
ignition voltage on circuit BRN/BLU. When ignition
voltage is energized by the PCM, the TCC solenoid stops
converter signal oil from exhausting. This causes
converter signal oil pressure to increase and move the
TCC valve. The TCC solenoid will deenergize when the
PCM no longer provides ignition voltage. When the TCC
solenoid is deenergized, it will exhaust fluid and release
the TCC.
This DTC detects low torque converter slip when the TCC
is commanded ªoffº. This is a type ªBº DTC.
Conditions For Setting The DTC
The following conditions occur once per TCC cycle, three
consecutive times:

No TPS DTCs P0122 or P0123.

No OSS DTCs P0722 or P0723.

No TCC solenoid DTC P1860.

TP angle is greater than 20%.

Engine speed is greater than 500 rpm and less than
3,000 rpm.

Engine vacuum is between 0 and 70 kPa.

Commanded gear is not 1st.

Gear range is D4.

TCC is commanded ªoffº.

No TCC Stuck off DTC P1870.
TCC slip speed is between ±20 and 40 rpm for 2
seconds.

Vehicle speed is greater than 25 km/h (15 mph) and
less than 120 km/h (75 mph).

Speed ratio is greater than 0.9 and less than 2.0.
Action Taken When The DTC Sets

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

Inhibit TCC engagement.
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.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±57
Diagnostic Aids

If the TCC is mechanically stuck ªonº with the parking
brake applied and any gear range selected, the TCC
fluid will mechanically apply the TCC, possibly
causing an engine stall.
Test Description
The number below refers to the step number on the
diagnostic chart:
3. This test checks the mechanical state of the TCC.
(When the PCM commands the TCC solenoid ªoffº,
the slip speed should increase).
DTC P0742 Torque Converter Clutch (TCC) System Stuck On
StepActionYe sNo
1Were you sent here from the ªPowertrain On±Board Diagnostic
(OBD) System Checkº?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emissions in
Engine section
21. Install the scan tool.
2. With the engine ªoffº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFreeze
Frameº and ªFailure Recordsº for reference, as data will be lost
when the ªClear Infoº function is used.
3. Record the DTC ªFreeze Frameº and ªFailure Recordsº.
4. Using the scan tool, verify the ªTP Sensorº operation.
Are the ªTP Sensorº values within 0.6 ± 5.0 volts?
Go to Step 3
Go to Diagnostic
Aids
3Drive the vehicle in the D4 drive range in fourth gear under steady
acceleration, with a TP angle greater than 20%.
Does the scan tool display ªTCC Slip Speedº between ±30 and
+30 rpm, while the displayed TCC solenoid state is ªoffº?
Go to Step 4
Go to Diagnostic
Aids
4The TCC is mechanically stuck ªonº. Check the following items:

Clogged exhaust orifice in the TCC solenoid.

Converter clutch apply valve stuck in the apply position.

Misaligned or damaged valve body gasket.

Restricted release passage.
Was a problem found and corrected?
Go to Step 5Ð
51. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and ensure the following conditions
are met:
TCC slip speed must be between 200 and 2,500 rpm for 4
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

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.

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±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.