lights ISUZU TF SERIES 2004 Owner's Guide

7A2-36 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.
DTC P0560 – System Voltage Error
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 Using a DVM, measure the battery voltage at the
battery.
Is the battery voltage greater than the specified
value? 11.5 V Go to Step 3 Charge battery,
then go to Step
3
3

1. Install a Tech 2.

2. Select “Ignition Volts" on the Tech 2.
3. Start the engine and raise the engine speed to the
specified value.

4. Load the electrical system by turning on the
headlights, high blower, etc.
Is the ignition voltage approximately equal to the
specified value? 2000 RPM
12.8-14.1 VGo to Step 4 Go to
Starting/Chargi
ng
4

1. Ignition “OFF".

2. Disconnect the TCM connector at the TCM.

3. Using a DVM, measure the battery voltage at the
TCM connector C-94.
Is it approximately equal to battery voltage? — Check for
excessive
curren draw
with ignition
“OFF" engine
“OFF". Go to Step 5
5

1. Check for faulty connections at the TCM harness
terminals.

2. Repair as necessary.
Was a repair necessary? — Verify repair Go to Step 6
6 Check for an open battery feed circuit to the TCM.
Is the action complete? — Verify repair Go to Step 7
7 Replace the TCM.
Important:
The replacement TCM must be
programmed. (Refer to SPS for procedure.)
Is the action complete? — Verify repair —

CONSTRUCTION AND FUNCTION 7A1-17

ATF Thermo Sensor

The ATF thermo sensor detects the ATF temperature in the oil pan and sends signal to the TCM.

The ATF thermo sensor is of the thermister type that the resistance value changes according to the ATF
oil temperature.

The lower is the ATF temperature, the larger is the resistance, and vice versa.

When the ATF temperature exceeds 145C, the TCM lights up the ATF temperature warning lamp in the
meter. When the ATF temperature decreases below 128C, the ATF temperature warning lamp goes out.

The ATF thermo sensor is installed to the lower control valve body and integrated with the harness
assembly.













10.0 100.0 1,000.0 10,000.0 100,000.0
-30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
A TF Temperature (°C)
Resistance (

)

Figure 29. Characteristic of Thermo Sensor


Figure 30. Location of Thermo Sensor
ATF Temperature
(deg. C) Resistance (Ohm)
(Approximately) ATF Temperature
(deg. C) Resistance (Ohm)
(Approximately)
-30 29,614 100 190
-20 16,705 110 149
-10 9,842 120 118
0 6,028 128 98
20 2,500 130 94
40 1,160 135 84
50 819 140 76
60 591 145 68
80 324 150 62

DIAGNOSIS (JR405E) 7A2-5
PAGE
NO. Z3: MODE LAMP (POWER DRIVE OR 3RD START) LIGHTS UP WHEN
THE POWER MODE OR 3RD START MODE IS TURNED OFF .................................. 7A2-137
NO. Z4: OIL TEMPERATURE WARNING LAMP LIGHTS UP ...................................... 7A2-137
NO. Z5: SELECT LEVER FEELING IS FAULTY. .......................................................... 7A2-137
NO. Z6: POOR FUEL CONSUMPTION ......................................................................... 7A2-138
NO. Z7: PATTERN SELECT SWITCH IS FAULTY........................................................ 7A2-138
NO. Z8: OIL IS SPLASHED DURING THE RUNNING .................................................. 7A2-138
NO. Z9: ABNORMAL SMELL ........................................................................................ 7A2-138
NO. Z10: ATF QUANTITY IS LOW OR HIGH ................................................................ 7A2-138
NO. Z11: ABNORMAL OIL PRESSURE........................................................................ 7A2-139
NO. Z12: REVERSE BUZZER DOES NOT RING .......................................................... 7A2-139
STALL TEST .................................................................................................................. 7A2-140
LINE PRESSURE TEST................................................................................................. 7A2-141
TIME LAG TEST............................................................................................................. 7A2-143
TEST DRIVE................................................................................................................... 7A2-144
SHIFT POINT CHART .................................................................................................... 7A2-147
SHIFT POINT DIAGRAM................................................................................................ 7A2-149
TCM VOLTAGE CHECK ................................................................................................ 7A2-154

DIAGNOSIS (JR405E) 7A2-91
SYMPTOM DIAGNOSIS

Symptom Condition Description
Oil Leak Breather Oil leaks from breather. J1
Between engine and converter housing Oil leaks between engine and converter
housing. J2
Between converter housing and main caseOil leaks between converter housing and
main case. J3
Between main case and rear housing Oil leaks between main case and rear
housing. J4
Oil pan Oil leaks from oil pan. J5
Manual shaft oil seal Oil leaks from manual shaft oil seal. J6
Oil cooler pipe Oil leaks from oil cooler pipe joint. J7
Other Transmission overheat You smell the transmission burning. Z1

The transmission smokes.
Mode lamp does not light up when the
power mode or 3rd start mode is turned on
The mode lamp on the instrument panel
does not light up though the power mode or
3rd start mode is turned on with the ignition
switch in ON position.
Z2
Mode lamp lights up when the power mode
or 3rd start mode is turned off
The mode lamp on the instrument panel
lights up though the power mode or 3rd start
mode is turned off with the ignition switch in
ON position.
Z3
Oil temperature warning lamp lights up Sometimes, the oil temperature warning
lamp lights up. Z4
Select lever feeling is faulty Select lever feeling is faulty. Z5
Poor fuel consumption Poor fuel consumption. Z6
Pattern select switch is faulty Shift pattern does not change though the
pattern select switch is turned on. Z7
Oil is splashed during the running Oil is splashed during the running. Z8
Abnormal smell Abnormal smell. Z9
Oil quantity is low or high Oil quantity is low or high. Z10
Abnormal oil pressure Oil pressure is low or high. Z11
Reverse buzzer does not ring Reverse buzzer does not ring in R range. Z12

DIAGNOSIS (JR405E) 7A2-137
No. Z2: Mode Lamp (Power Drive or 3rd Start) Does Not Light Up
When The Power Mode or 3rd Start Mode is Turned On

Description:

The mode lamp on the instrument panel does not light up though the power mode or 3rd start mode is turned on
with the ignition switch in ON position.

Possible Cause:

Faulty mode select switch is considered.

Bulb burn out.


No. Z3: Mode Lamp (Power Drive or 3rd Start) Lights Up When
The Power Mode or 3rd Start Mode is Turned Off

Description:

The mode lamp on the instrument panel lights up though the power mode or 3rd start mode is turned off with the
ignition switch in ON position.

Possible Cause:

Faulty mode select switch is considered.


No. Z4: Oil Temperature Warning Lamp Lights up

Description:

Sometimes, the oil temperature warning lamp lights up.

Possible Cause:

When the vehicle is stuck in the mud or continues to accelerate under overload, and ATF temperature exceeds
145 C, the oil temperature warning lamp lights up.

If the oil temperature warning lamp lights up under usual service condition, following causes are considered.

ATF level has increased for some fault.
Refer to "No. Z1: Transmission overheat".

Lights up due to error of the ATF oil thermo sensor.

No. Z5: Select Lever Feeling is Faulty.

Description:

Select lever feeling is faulty.

Possible Cause:

Disordered select cable.

Disordered select lever.

Faulty Manual plate.