2002 ISUZU AXIOM Service Repair Manual

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Page 1737 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A1±50
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0723 Automatic Transmission Output Speed Sensor (OSS) Intermittent (Contd)
StepNo Ye s Action
13Repair the open in circuit BLU/GRN.
Is the repair c

Page 1738 of 2100

ISUZU AXIOM 2002 Service Repair Manual 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 Mod

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.

Page 1739 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A1±52
TRANSMISSION CONTROL SYSTEM (4L30±E)
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
2. This step isolates the brake switch as a source for
setting the D

Page 1740 of 2100

ISUZU AXIOM 2002 Service Repair Manual TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±53
DTC P0730 Gear Error Without Input Speed
D07RY00055
Circuit Description
The Powertrain Control Module (PCM) calculates the
slippage of the converter and t

Page 1741 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A1±54
TRANSMISSION CONTROL SYSTEM (4L30±E)
The PCM will illuminate the CHECK TRANS Lamp.
Turn force motor OFF.
Conditions For Clearing The DTC/CHECK
TRANS Lamp
The PCM will turn ªoffº the CHEC

7A1±54
TRANSMISSION CONTROL SYSTEM (4L30±E)
The PCM will illuminate the CHECK TRANS Lamp.
Turn force motor OFF.
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 Gear Error Without Input Speed
StepActionYe sNo
1Were you sent here from the ªOn±Board Diagnostic (OBD)
System Checkº?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emission in
Engine section
2Visually 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 7Go to Step 3
3Refer to Checking Transmission Fluid Level and Condition in
Automatic Transmission (4L30±E) section.
Has transmission fluid checking procedure been performed?
Go to Step 4
Go to Checking
Transmission
Fluid Level and
Condition in
Automatic
Transmission
(4L30±E) section
41. 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 L, 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 AidsGo to Step 5

Page 1742 of 2100

ISUZU AXIOM 2002 Service Repair Manual TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±55
DTC P0730 Gear Error Without Input Speed (Contd)
StepNo Ye s Action
5Perform line pressure check.
Refer to
Line Pressure Test in Automatic Transmission

Page 1743 of 2100

ISUZU AXIOM 2002 Service Repair Manual 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

Page 1744 of 2100

ISUZU AXIOM 2002 Service Repair Manual 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

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

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