Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 296

AUTOMATIC TRANSMISSION (AW30-40LE) 7A-33

IDENTIFICATION OF TRANSMISSION CONTROL MODULE (TCM)

826R200032

Legend

1. ISUZU Parts No.:
‘02UBS

― 8-97230-821-0 (For General Export)

‘02TFS

― 8-97303-885-0 (For Australia)

‘02TFR

― 8-97303-884-0 (For Australia and South Africa)

‘01TFR

― 8-97254-431-0 (For Thailand)

2. Calibration Code
3. Production Date:

4. Software Version No.:

5. Model Year, Vehicle Model, Engine Type
6. Serial No.

7A-34 AUTOMATIC TRANSMISSION (AW30-40LE)

DIAGNOSTIC TROUBLE CODES (DTC) CHECK

DTC

NUMBER

FLASHING

CODE

DESCRIPTION

P0120

21

ANALOG THROTTLE SIGNAL FAILURE (VTH) (FOR UBS)

P0502

24

SPEED METER SENSOR FAILURE (SP1)

P0705

17

GEAR SELECTOR FAILURE (PRND2L)

P0710

16

OIL TEMPERATURE SENSOR FAILURE (OT2)

P0717

14

INPUT REVOLUTION SENSOR FAILURE (NC0)

P0722

11

OUTPUT REVOLUTION SENSOR FAILURE (SP2)

P0727

13

ENGINE REVOLUTION SIGNAL FAILURE (NE)

P0743

33

TORQUE CONVERTER CLUTCH CONTROL LOCK-UP (ON/OFF) SOLENOID
FAILURE (SL)

P0748

35

PRESSURE CONTROL SOLENOID FAILURE (STH)

P0753

31

SOLENOID 1 FAILURE (S1)

P0758

32

SOLENOID 2 FAILURE (S2)

P1120

22

PWM THROTTLE SIGNAL FAILURE(TH) (FOR TFR/S)

P1121

23

ANALOG THROTTLE SIGNAL FAILURE (VREF, VGND) (FOR UBS)

AUTOMATIC TRANSMISSION (AW30-40LE) 7A-35

DTC P0120 (FLASHING CODE 21)

ANALOG THROTTLE SIGNAL FAILURE (VTH) (FOR UBS)

D07R200063

Circuit Description:

When the signal of the engine throttle position sensor
located on the accelerator pedal is supplied to the
TCM, the TCM judges the opening condition of the
throttle.
The shift point of the transmission is determined by this
opening condition of the throttle.

Fail-safe control:

The TCM controls fail-safe by detecting analog throttle
signal (VTH) failure.

Failure detection:

• When the throttle input voltage is detected less

than 0.112V or more than 4.417V for 2.0 seconds.

Contents of control:

At failure detection

• Throttle opening for line pressure control ... Throttle

opening 100%

• Throttle opening for shift control ... Throttle opening

0%

• Lock-up control inhibit

• Up hill and down hill control inhibit

• Squat control inhibit

At failure decision

Executes following items in addition to above
control items at failure detection.

• Blinks "CHECK TRANS" lamp

• Stores the failure information in failure-memory

Conditions of turning "CHECK TRANS" lamp
off:

Turns “CHECK TRANS” lamp off when judged 0km/h
by output revolution sensor after throttle signal input
voltage is detected more than 0.112V and less than
4.717V.
(however, uses 0 km/h judgment by back-up vehicle
speed at output revolution failure)

Reversion conditions from fail-safe:

At failure detection

Immediately recovers when the throttle input
voltage is detected more than 0.112V and less than
4.717V.

At failure decision

Recovers at the same time as the conditions of
turning “CHECK TRANS” lamp off are satisfied.

Test description:

The following numbers correspond to the step numbers
on the diagnostic chart.
1. Check that the throttle input voltage is 0.25 to

0.45V.

2. At this test, check that as the throttle opens, the

voltage goes up and that the voltage reaches 3.74
to 4.56V at the full open status.

6. Check the power supply voltage (4.75 – 5.25V) of

the throttle position sensor.

7A-36 AUTOMATIC TRANSMISSION (AW30-40LE)

Diagnostic aids:

An intermittent may be caused by a poor connection,
rubbed through wire insulation or a wire broken inside
the insulation. Inspect related harness connector for
backed out terminals, improper mating, broken locks,
improperly formed or damaged terminals, poor terminal
to wire connection and damaged harness.
.