Transmission ISUZU TF SERIES 2004 Workshop Manual
[x] Cancel search | Manufacturer: ISUZU, Model Year: 2004, Model line: TF SERIES, Model: ISUZU TF SERIES 2004Pages: 4264, PDF Size: 72.63 MB
Page 3737 of 4264
TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-57
Step Action Value(s) YES NO
4
1. Key "OFF".
2. Disconnect the TCM connector (C-94).
3. Key "ON".
4. Measure the voltage between terminal C94-5 and
terminal C94-1 by J39200 DMM.
Is the voltage specified value? 0V Go to Step 5 Go to Step 7
5
1. Key “OFF".
2. Measure the resistance between terminal C94-5
and body ground by J39200 DMM.
Is the resistance specified value? Go to Step 9 Go to Step 6
6
1. Disconnect the automatic transmission connector
(E-82).
2. Measure the resistance between terminal E82-7
and body ground by J39200 DMM.
Is the resistance specified value? Go to Step 7 Go to Step 8
7
1. Check for open or short in the wire between
terminal C94-5 and terminal E82-7.
2. Repair or replace the wire between terminal C94-5
and terminal E82-7.
Is the action complete? — Verify repair —
8 Replace the SL solenoid.
Is the action complete? — Verify repair —
9
1. Clear the DTC.
2. Perform the test-driving.
3. Check the DTC.
Was DTC P0743 stored? — Go to Step 10 Refer to
Diagnostic Aids
10 Replace the TCM.
Is the action complete? — Verify repair —
Page 3738 of 4264
7A2-58 TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)
DTC P0748 (FLASHING CODE 35) Pressure Control Solenoid Electrical
RTW37ALF000601
Circuit Description
The pressure control solenoid is a PWM duty control
solenoid located in the valve body.
The pressure control solenoid is a TCM-controled
device used to regulate transmission throttle pressure
by energizing current from the TCM.
Condition for setting the DTC
The TCM detects following "Condition 1" and "Condition
2".
Condition 1("Ignition short"):
When the TCM detects following condition for 0.5
sec continuously.
Monitor A/D value is more than 1000 (1.36A).
Condition 2("Open or GND short"):
When the TCM detects following condition for 70
msec continuously.
Monitor A/D value is less than 15 (20mA).
Action Taken When The DTC Sets
No squat control.
No line pressure control.
No lock-up control.
No slope control.
Check Trans ON.
Page 3739 of 4264
TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-59
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.
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.
DTC P0748 (FLASHING CODE 35) Pressure Control Solenoid Malfunction
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
1. Install the scan tool.
2. Key “ON".
3. Review and record scan tool data.
4. Operate the vehicle within scan tool data.
Does the scan tool indicate DTC P0748? — Go to Step 3 Refer to
Diagnostic Aids
3 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 4 Refer to
checking
Transmission
Fluid level and
Condition in
Automatic
Transmission
(AW30-40LE)
section
Page 3740 of 4264
7A2-60 TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)
Step Action Value(s) YES NO
4 Measure the resistance of pressure control solenoid.
1. Key “OFF".
2. Disconnect the automatic transmission connector
and TCM connector.
3. Measure the resistance between automatic
transmission terminal E82-2 and automatic
transmission terminal E82-6.
Is the resistance specified value? 5 to 5.6 at
68F (20C)Go to Step 5 Go to Step 8
5 Measure the resistance of wire between terminal
C94-2 and terminal C94-4
1. Key “OFF".
2. Connect the automatic transmission connector.
3. Disconnect the TCM connector.
4. Measure the resistance between terminal C94-2
and terminal C94-4.
Is the resistance specified value? 5 to 5.6 at
68F (20C)Go to Step 7 Go to Step 6
6 Repair or Replace the wire between terminals C94-
2,4 and terminals E82-6,2.
Is the action complete? — Verify repair —
7 Observe the pressure control solenoid valve data on
the scan tool data.
1. Key “ON".
Does the scan tool indicate is specified value? 1.0- Verify repair Go to Step 9
8 Replace the pressure control sorenoid.
Is the action complete? — Verify repair —
9 Replace the TCM.
Important:
The replacement TCM must be
programmed (Refer to SPS for procedure).
Is the action complete? — Verify repair —
Page 3741 of 4264
TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-61
DTC P0753 (FLASHING CODE 31) Shift Solenoid S1 Electrical
RTW37ALF000601
Circuit Description
The shift solenoi S1 changes the hydraulic route with
the signals from the TCM according to the vehicle
speed and the throttle opening to control shifting. When
the solenoid S1 or S2 fails, the hydraulic circuit is
mechanically operated as a backup.
Condition for setting the DTC
The TCM detects following "Condition 1" and "
Condition 2" for 2 times continuously at shifting.
Condition 1("GND short"):
Voltage at connector pin is 0V for 0.3 sec
continuously when solenoid is “ON".
Condition 2("Open or Ignition short"):
Voltage at connector pin is ignition voltage for 0.5
sec continuously when solenoid is “OFF".
Page 3742 of 4264
7A2-62 TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)
Action Taken When The DTC Sets
The TCM operates shifting as following pattern.
Normal Fail S1 S2
1 3 - on
2 3 - on
3 3 - on
4 4 - off
No squat control.
No engine torque control.
No line pressure control.
No lock-up control.
No slope control.
Check Trans ON.
DTC stored.
No detect DTC P0722
No detect DTC P0717
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.
DTC P0753 (FLASHING CODE 31) Shift Solenoid S1 Electrical
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
1. Install the scan tool.
2. Key “ON".
3. Review and record scan tool data.
4. Operate the vehicle within scan tool data.
Does the scan tool indicate DTC P0753? — Go to Step 3 Refer to
Diagnostic Aids
3
1. Key “ON", engine run.
2. Place the selector lever in the "P" range.
3. Measure the voltage between terminal C94-16 and
terminal C94-1 on the TCM pigtail connector by
J39200 DMM.
Is the voltage specified value? 816V Go to Step 4 Go to Step 10
Page 3743 of 4264
TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-63
Step Action Value(s) YES NO
4
1. Key "OFF".
2. Disconnect the TCM connector (C-94).
3. Key "ON".
4. Measure the voltage between terminal C94-16 and
terminal C94-1 by J39200 DMM.
Is the voltage specified value? 0V Go to Step 5 Go to Step 7
5
1. Key “OFF".
2. Measure the resistance between terminal C94-5
and body ground by J39200 DMM.
Is the resistance specified value? Go to Step 9 Go to Step 6
6
1. Disconnect the automatic transmission connector
(E-82).
2. Measure the resistance between terminal E82-4
and body ground by J39200 DMM.
Is the resistance specified value? Go to Step 7 Go to Step 8
7
1. Check for open or short in the wire between
terminal C94-16 and terminal E82-4.
2. Repair or replace the wire between terminal C94-
16 and terminal E82-4.
Is the action complete? — Verify repair —
8 Replace the SL solenoid.
Is the action complete? — Verify repair —
9
1. Clear the DTC.
2. Perform the test-driving.
3. Check the DTC.
Was DTC P0753 stored? — Go to Step 10 Refer to
Diagnostic Aids
10 Replace the TCM.
Is the action complete? — Verify repair —
Page 3744 of 4264
7A2-64 TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)
DTC P0758 (FLASHING CODE 32) Shift Solenoid S2 Electrical
RTW37ALF000601
Circuit Description
The solenoid S2 changes the hydraulic route with the
signals from the TCM according to the vehicle speed
and the throttle opening to control shifting. When the
solenoid S1 or S2 fails, the hydraulic circuit is
mechanically operated as a backup.
Condition for setting the DTC
The TCM detects following "Condition 1" and "Condition
2" for 2 times continuously at shifting.
Condition 1 ("GND short"):
Voltage at connector pin is 0V for 0.3 sec
continuously when solenoid is “ON".
Condition 2 ("Open or Ignition short"):
Voltage at connector pin is ignition voltage for 0.5
sec continuously when solenoid is “OFF".
Page 3745 of 4264
TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-65
Action Taken When The DTC Sets
The TCM operates shifting as following patterns.
Normal Fail S1 S2
1 3 - on
2 3 - on
3 3 - on
4 4 - off
No squat control.
No engine torque control.
No line pressure control.
No lock-up control.
No slope control.
No torque reduction.
Check Trans ON.
DTC stored.
No detect DTC P0722.
No detect DTC P0717.
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.
DTC P0758 (FLASHING CODE 32) Shift Solenoid S2 Electrical
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
1. Install the scan tool.
2. Key “ON".
3. Review and record scan tool data.
4. Operate the vehicle within scan tool data.
Does the scan tool indicate DTC P0758? — Go to Step 3 Refer to
Diagnostic Aids
3
1. Key “ON", engine run.
2. Place the selector lever in the "P" range.
3. Measure the voltage between terminal C94-15 and
terminal C94-1 on the TCM pigtail connector by
J39200 DMM.
Is the voltage specified value? 816V Go to Step 4 Go to Step 10
Page 3746 of 4264
7A2-66 TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)
Step Action Value(s) YES NO
4
1. Key "OFF".
2. Disconnect the TCM connector (C-94).
3. Key "ON".
4. Measure the voltage between terminal C94-15 and
terminal C94-1 by J39200 DMM.
Is the voltage specified value? 0V Go to Step 5 Go to Step 7
5
1. Key “OFF".
2. Measure the resistance between terminal C94-15
and body ground by J39200 DMM.
Is the resistance specified value? Go to Step 9 Go to Step 6
6
1. Disconnect the automatic transmission connector
(E-82).
2. Measure the resistance between terminal E82-8
and body ground by J39200 DMM.
Is the resistance specified value? Go to Step 7 Go to Step 8
7
1. Check for open or short in the wire between
terminal C94-15 and terminal E82-8.
2. Repair or replace the wire between terminal C94-
15 and terminal E82-8.
Is the action complete? — Verify repair —
8 Replace the SL solenoid.
Is the action complete? — Verify repair —
9
1. Clear the DTC.
2. Perform the test-driving.
3. Check the DTC.
Was DTC P0758 stored? — Go to Step 10 Refer to
Diagnostic Aids
10 Replace the TCM.
Is the action complete? — Verify repair —