2004 ISUZU TF SERIES check oil

7A2-34 TRANSMISSION CONTROL SYSTEM (AW30 –40LE) (V6 3.5L)

TCM Diagnostic Trouble Codes
The following table lists the diagnostic trouble codes supported by this vehicle application. If any DTCs not listed here
are displayed by a scan tool, the scan tool data may by faulty; notify the scan tool manufacture of any DTCs
displayed that are not included in the following table.
DTC
NUMBER FLASH
CODE DTC NAME
“CHECK
TRANS"
P0560 25 System Voltage Error —
P0602 63 Transmission Control Module (TCM) Programming Error —
P0705 17 Transmission Range Sensor Circuit Malfunction ON
P0712 15 Transmission Oil Temperature Sensor Circuit Low Input ON
P0713 16 Transmission Oil Temperature Sensor Circuit Hight Input ON
P0717 14 Input Speed Sensor Signal Error ON
P0722 11 Output Speed Sensor Signal Error ON
P0743 33 Torque Converter Clutch Electrical ON
P0748 35 Pressure Control Solenoid Electrical ON
P0753 31 Shift Solenoid S1 Electrical ON
P0758 32 Shift Solenoid S2 Electrical ON
P1767 67 ECM CAN (Control Area Network) Invalid ON
P1790 61 Transmission Control Module ROM Checksum Error ON
P1791 62 Transmission Control Module RAM Error ON
U2104 65 CAN (Control Area Network) BUSS OFF ON

TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-43

DTC P0712 (FLASHING CODE 15) Transmission Oil Temperature Sensor
Circuit Low Input

RTW37AMF000201
Circuit Description
The oil temperature sensor is a thermistor sensor that
is installed in the transmission case and converts
temperature changes into continuous electric signals,
then outputs them to the Transmission Control Module
(TCM). When the ATF temperature is low, the
resistance of the sensor (thermistor) goes up, so that
the voltage of the TCM signal becomes high.
As the ATF is gradually warmed, the resistance of the
sensor goes down and the voltage becomes low. At the
normal operating ATF temperature (80

C/176

F) of the
transmission, the voltage of the TCM is about 3.7V.
Condition for setting the DTC

The TCM detects following "Condition" for 5 min
continuously.
Condition ("Short"):

Oil temperature is more than 220

C (428

F).

Action Taken When The DTC Sets

The TCM judges oil temperature is 100

C (212

F).
 Check Trans ON.

DTC stored.
Conditions For Clearing The DTC

The DTC can be cleared from the TCM history by
using a scan tool.
 The DTC will be cleared from history when the
vehicle has achieved 40 warm-up cycles without a
failure reported.

After more than 1 second has elapsed after the
ignition key has been turned “ON", short between
No.11 and No.4 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.

7A2-44 TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)

Diagnostic Aids

Inspect the wiring for poor electrical connection at
the TCM. 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 o
r
open condition, move the wiring harness while
observing test equipment for a change.
 Check oil temperature sensor for proper mounting
and adjustment.



DTC P0712 (FLASHING CODE 15) Transmission Oil Temperature Sensor
Circuit Low Input


Step Action Value(s) YES NO
1
Was the powertrain On-Board Diagnostic (OBD)
System Check performed? — Go to Step 2 Go to OBD
System Check
2 Perform the transmission fluid checking procedure.
Refer to checking Transmission Fluid level and
Condition in Automatic Transmission 7A section.
Was the fluid checking procedure performed ? — Go to Step 3 Refer to
Checking
Transmission
Fluid level and
Condition in
Automatic
Transmission
(AW30-40LE)
section
3

1. Install the scan tool.

2. Key “ON"
3. Review and record scan tool data.

4. Operate the vehicle with in scan tool data.
Does the scan tool indicate DTC P0712 ? — Go to Step 4 Refer to
Diagnostic Aids
4 Measure the voltage of the transmission fluid
temperature sensor by the J39200 DMM.

1. Key “OFF".
2. Disconnect the oil temperature sensor connector.

3. Key “ON".

4. Connect the J39200 DMM to the each terminal of
the oil temperature sensor connector E83-2 and
E83-1.
Does the scan tool indicate less than specified
value ? 5V Go to Step 5 Go to Step 6
5 Replace the transmission fluid temperature sensor.
Is the action complete ? — Verify repair —

7A2-46 TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)

DTC P0713 (FLASHING CODE 16) Transmission Oil Temperature Sensor
Circuit Hight Input

RTW37AMF000201
Circuit Description
The oil temperature sensor is a thermistor sensor that
is installed in the transmission case and converts
temperature changes into continuous electric signals,
then outputs them to the Transmission Control Module
(TCM). When the ATF temperature is low, the
resistance of the sensor (thermistor) goes up, so that
the voltage of the TCM signal becomes high.
As the ATF is gradually warmed, the resistance of the
sensor goes down and the voltage becomes low. At the
normal operating ATF temperature (80

C/176

F) of the
transmission, the voltage of the TCM is about 3.7V.
Condition for setting the DTC

The TCM detects following "Condition" for 15 min
from ignition ON.
Condition ("Open"):

Fluctuation of high temperature fixed value is
2.3

C (36

F).
 Fluctuation of low temperature fixed value is -10

C
(14
F).
Action Taken When The DTC Sets

The TCM judges oil temperature is 100

C (212

F).

Check Trans ON.
 DTC stored.
Conditions For Clearing The DTC

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

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

After more than 1 second has elapsed after the
ignition key has been turned “ON", short between
No.11 and No.4  (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.

TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-47

Diagnostic Aids

Inspect the wiring for poor electrical connection at
the TCM. 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 o
r
open condition, move the wiring harness while
observing test equipment for a change.

Check oil temperature sensor for proper mounting
and adjustment.

DTC P0713 (FLASHING CODE 16) Transmission Oil Temperature Sensor
Circuit Hight Input


Step Action Value(s) YES NO
1
Was the powertrain On-Board Diagnostic (OBD)
System Check performed ? — Go to Step 2 Go to OBD
System check
2 Perform the transmission fluid checking procedure.
Refer to Checking Transmission Fluid Level and
condition Automatic Transmission7A section.
Was the fluid checking procedure performed ? — Go to Step 3 Refer to
checking
Transmission
Fluid Level and
Condition
Automatic
Transmission
(AW30-40LE)
section
3

1. Install the scan tool ?

2. Key “ON"
3. Review and record scan tool date.

4. Operate the vehicle with in scan tool data.
Does the scan tool indicator DTC P0713 ? — Go to Step 4 Go to
Diagnostic Aids
4 Observe the voltage of the transmission fluid
temperature sensor on the TECH2 data.

1. Key “OFF".

2. Disconnect the transmission fluid temperature
sensor connector E-83
3. Install a fused jumper wire from terminal E83-2 to
E83-1 on the mission harness.

4. Key “ON".
Does the scan tool indicate more than specified
value ? 0.4V Go to Step 5 Go to Step 6
5 Replace the transmission fluid temperature sensor .
If the action complete ? — Verify repair —

7A2-68 TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)


 Engine REV is 7000 rpm.

Coolant tempreature is 80

C.

No detect DTC P0712, 0713.
 No detect DTC P0560.
Conditions For Clearing The DTC

The DTC can be cleared from the TCM history by
using a scan tool.
 The DTC will be cleared from history when the
vehicle has achieved 40 warm-up cycles without a
failure reported.

After more than 1 second has elapsed after the
ignition key has been turned “ON", short between
No.11 and No.4 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.
Diagnostic Aids

Inspect the wiring for poor electrical connection at
the TCM. 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 o
r
open condition, move the wiring harness while
observing test equipment for a change.

Inspect the wiring for EMI (Erectro-Magnetic
Interference). Check that all wires are properly
routed away from coil, and generator. Also check fo
r
improperly installed electrical options. When this test
is performed, turn “OFF" on electronic autoparts
switches to improperly for a noise preventing.

TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-75


 No detect DTC P1767.

No detect DTC P0560.

No detect DTC P0712, 0713.
Conditions For Clearing The DTC

The DTC can be cleared from the TCM history by
using a scan tool.
 The DTC will be cleared from history when the
vehicle has achieved 40 warm-up cycles without a
failure reported.

After more than 1 second has elapsed after the
ignition key has been turned “ON", short between
No.11 and No.4 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.
Diagnostic Aids

Inspect the wiring for poor electrical connection at
the TCM. 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 o
r
open condition, move the wiring harness while
observing test equipment for a change.

Inspect the wiring for EMI (Erectro-Magnetic
Interference). Check that all wires are properly
routed away from coil, and generator. Also check fo
r
improperly installed electrical options. When this test
is performed, turn “OFF" on electronic auto parts
switches to improperly for a noise preventing.

7A3-14 ON-VEHICLE SERVICE (AW30 –40LE)

Measure Time Lag
1. Fully apply the parking brake.
2. Start the engine. Check idling speed (A/C OFF).
3. Shift the shift lever from “N" to “D" range. Using a
stopwatch, measure the time it takes from shifting
the lever until the shock is felt.
Time lag: Less than 0.7 seconds
4. In same manner, measure the time lag for “N"


“R".
Time lag: Less than 1.2 seconds
Evaluation
1. If “N" 
“ D" time lag is longer than specified:

Line pressure too low
 Forward clutch malfunction
 No.2 one-way clutch not operating properly
2. If “N" 
“ R" time lag is longer than specified:

Line pressure too low
 Direct clutch malfunction
 No.3 brake malfunction
3. If both time lag is longer than specified:

Line pressure too low

Hydraulic Test



RUW37ALH000201
Preparation

1. Warm up the transmission fluid.
2. Remove the transmission case test plug and mount the hydraulic pressure gauge.
Oil pressure gauge: J –29770 –A
NOTE: Perform the test at normal operation fluid
temperature (50 – 80 
C or 122 – 176 
F).