Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 647

7A1–88 AUTOMATIC TRANSMISSION (4L30-E)

DIAGNOSTIC TROUBLE CODE (DTC) 32

SOLENOID B SHORT TO GROUND OR OPEN

This DTC flashes the CHECK TRANS indicator and
sets the BACKUP MODE.

Circuit Description:

•

The solenoid B is a simple ON/OFF solenoid
located in the main case valve body. The
solenoid is the normally open-type. When the
port is open, fluid pressure actuates the shift
valve. In first or second gear the Transmission
Control Module (TCM) energizes the solenoid to
close a fluid inlet port.

•

The solenoid is activated by a current. This
current is produced by applying a voltage to one
side (the High side) and a ground to the other
side (Low side).

•

The High Side Driver (HSD) is a circuit of the TCM
that acts as a switch between the solenoids and
the supply voltage. The High side of the solenoid
is permanently supplied with voltage, except in
BACKUP MODE or when ignition is OFF the HSD
is turned OFF.

•

The TCM continually monitors the solenoid
connection to its Low Side Driver (LSD) for either
low or high voltage. The LSD is a circuit of the
TCM that acts as a switch between the solenoid
and ground. When the solenoid is commanded
ON the TCM is switching the solenoid to ground.

•

There are two tests of the LSD: When the engine
is cranked (DTC82) and when the ignition is
turned ON (DTC32).

•

When the ignition is turned ON, and before the
engine is cranked, the TCM activates the shift
solenoids (A, B and Band) to check for short
circuits or open circuits. To do so the gear is set
to 4th, 3rd, 1st, 1st with band apply, 4th with no
HSD. Each one of the 5 tests requires 0.15
second. If the engine is cranked before the end of
all tests, the remaining tests are not done.

Diagnostic Aids:

•

This Diagnostic is an electrical test done by the
TCM.

•

Detection conditions:
1 The solenoid low side connected to TCM

terminal A3 is shorted to ground or open.

2 The test is only done when ignition is ON.
3 Engine Speed < 480 RPM (not cranked) and

Output Speed = 0 RPM.

4 The conditions need to be present for 0.15 to

0.88 second after ignition switch ON.

•

Action after the detection time: BACKUP MODE.

•

Recovery conditions: To recover, do an IGNITION
CYCLE.

SHIFT
SOLENOID
A

SHIFT
SOLENOID
B

BAND
APPLY
SOLENOID

AUTOMATIC
TRANSMISSION

M-7

1(A)

4(C)

C-96

BRN/BLK

H-23

BRN/WHT

H-25

BLK

A3(3)

C-95

C12(12)

C1(1)

D1(17)

SHIFT
SOLENOID B
CONTROL

GROUND

TRANSMISSION
CONTROL
MODULE (TCM)

GROUND

BRN/BLK

BRN/WHT

D07LW012

AUTOMATIC TRANSMISSION (4L30-E) 7A1–89

DIAGNOSTIC TROUBLE CODE (DTC) 32

SOLENOID B SHORT TO GROUND OR OPEN

YES

•

Ignition switch OFF.

•

Disconnect Transmission Control Module (TCM)
connector C-95 and C-96.

•

Connect ohmmeter between connector C-95 terminal
C12 and connector C-96 terminal A3.

IF: Display between 17.5 and 18.5 ohms?

•

Connect ohmmeter between connector C-96
terminal A3 and connector C-95 terminal C1
(TCM ground).

IF: Short circuit:

Check for an open circuit between connector C-
96 terminal A3 and connector C-95 terminal C1.
IF: Wiring problem?

The problem is intermittent.
GOTO INTERMITTENT
CONDITIONS.

The problems is
intermittent.
GOTO INTERMITTENT
CONDITIONS.

Replace the
solenoid B.

•

Check for faulty connector or
wiring between terminal A3
and ground.

Repair.

•

Disconnect solenoid B connector.
IF: Ohmmeter displays between 17.5 and 18.5
ohms on the solenoid B terminals:

Repair.

7A1–90 AUTOMATIC TRANSMISSION (4L30-E)

DIAGNOSTIC TROUBLE CODE (DTC) 33

TCC HIGH SHORT TO PLUS OR OPEN

This DTC flashes the CHECK TRANS indicator and
does NOT set the BACKUP MODE.

Circuit Description:

•

The Torque Converter Clutch (TCC) solenoid is a
simple ON/OFF solenoid connected to the
adapter case valve body. When the solenoid is
energized by the Transmission Control Module
(TCM), it opens a fluid port. When the port is
open, line pressure actuates the converter clutch
control valve which engages the torque converter
clutch by exhausting the fluid. The TCM engages
the torque converter clutch only when all of the
following conditions exist:
1 The transmission is at operating temperature.
2 The brake pedal is released.
3 The transmission is operating in second, third

or fourth gear.

4 The engine is warm (more than 70°C).
5 The shift pattern requests TCC apply.
6 Shift finished.
7 No malfunction which will disable the TCC:

DTC43, DTC55 (only short to ground).

•

The solenoid is activated by a current. This
current is produced by applying a voltage to one
side (the High side) and a ground to the other
side (Low side).

•

The High Side Driver (HSD) is a circuit of the TCM
that acts as a switch between the solenoid and
the supply voltage. The High side of the TCC
solenoid is used to turn the TCC ON or OFF
because the Low side is permanently connected

to the ground of the transmission. In BACKUP
MODE or when ignition is turned OFF the TCC
High Side is turned OFF.

•

The TCM continually monitors the solenoid
connection to its High Side Driver for either low
or high voltage.

•

There is only one test of the HSD for TCC: when
the engine is cranked and the TCC is turned ON.

•

If this circuit is shorted to plus, the TCC solenoid
is constantly commanded ON (shifts can be firm).
In 1st gear the TCC is hydraulically OFF, whatever
the TCC solenoid position. This means that the
car can be driven even with the TCC shorted to
voltage. The engine could stall when the driver is
braking strongly, if the car is stopped when the
transmission is still in second gear with TCC
applied.
Note: The 3-2 shifts are very firm.

Diagnostic Aids:

•

This diagnostic is an electrical test done by the
TCM.

•

Detection conditions:
1 The solenoid high side connected to TCM

terminal C7 is shorted to voltage or open.

2 The condition needs to be present for 0.13

second.

•

Action after the detection time:
1 TCC is turned OFF.
2 CHECK TRANS indicator turned ON.

•

Recovery conditions: To recover, do an IGNITION
CYCLE.

TORQUE
CONVERTER
CLUTCH
SOLENOID
CONTROL

TRANSMISSION
CONTROL
MODULE (TCM)

AUTOMATIC
TRANSMISSION

M-6

4(A)

C-95

TORQUE
CONVERTER
CLUTCH
SOLENOID

H-23

RED/YEL

BLK

H-25

C1(1)

D1(17)

C7(7)

RED/YEL

D07LW013

AUTOMATIC TRANSMISSION (4L30-E) 7A1–91

IF you have a SCAN TOOL: TECH2?

Without TECH2 you can not do preliminary test.

YES

DIAGNOSTIC TROUBLE CODE (DTC) 33

TCC HIGH SHORT TO PLUS OR OPEN

CONTINUED ON

CONTINUED ON
NEXT PAGE

YES

TCC: Torque Converter Clutch
TCM: Transmission Control Module

SHORT TO PLUS?

•

Ignition switch ON. Engine OFF.

•

Connect a voltmeter between
connector C-95 terminal C7 and car
ground or with TCM ground
terminal C1.

IF: voltage found:

SHORT TO PLUS?

•

Ignition switch ON. Engine OFF.

•

Connect a voltmeter between
connector C-95 terminal C7 and car
ground or with TCM ground
terminal C1.

IF: voltage found:

CASE: SLIP > 20 RPM with
TCC = ON

The TCC is shorted to voltage.

•

Check wire for a short to voltage between
terminal C7 and solenoid.
Note: This short can be to another wire of the
adapter case connector M-6.
In this case the problem occurs only when
voltage is present at the second wire.

•

Repair.

CASE: SLIP = 0+ OR -10 RPM
with TCC = OFF at any TPS:

This means that the TCC valve
is stuck ON or TCC solenoid is
shorted to plus.

This means that the TCC valve
is stuck OFF or the TCC
solenoid connections are
OPEN.

GOTO TCM MEM-CAL
REPLACEMENT.

•

Install scan tool: TECH2 GOTHROUGH TECH2 CONNECTION.

While driving the car in 2nd, 3rd or 4th gear check if the TCC is
slipping or not when the TCC solenoid is commanded OFF or
ON by the TCM.

Push F0: DATA LIST:
Read TCC state and SLIP value.

CASE: DTC43
GOTO DTC43.

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