Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Service manual - part 643

7A1–72 AUTOMATIC TRANSMISSION (4L30-E)

DIAGNOSTIC TROUBLE CODE (DTC) 15

TRANSMISSION OIL TEMPERATURE SHORT TO PLUS OR OPEN

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

Circuit Description:

•

The transmission oil temperature sensor is a
thermistor within the internal wiring harness of
the transmission in the adaptor case oil pan. The
Transmission Control Module (TCM) applies 5
volts to the sensor connector M-6 terminal 3(C).
The other side of the sensor is connected to
ground through the TCM terminal C14.
When the transmission oil is cold, the sensor
resistance is high and the TCM will sense high
signal voltage.

•

As the transmission oil temperature warms to
normal transmission operating temperature of
80°C (176°F), the sensor resistance becomes less
and the voltage decreases at about 3.5 volts.
Note, for more accuracy the measurement is
done differently for low temperature (less than
45°C) and high temperature (more than 50°C).

•

When DTC15 is set, the transmission will use a
warm value for operation, but the scan tool will
display the actual oil temperature.

•

Table shows thermistor resistance at different
temperatures.

Table:

Diagnostic Aids:

•

This Diagnostic is an electrical test done by the
TCM.

•

Detection conditions:

1

Voltage between terminals B3 and C14 > 4.74

volts.

2

The condition needs to be present for at least
20 seconds. Note: during the detection time
the TCM reads the high voltage that defines a
–40°C temperature.

•

Action after the detection time: Default Trans-
mission Oil Temperature is set to 100°C.

•

Recovery conditions: To recover when voltage <
or = to 4.74 volts after detection time.

°C

°F

Resistance (k

Ω

)

–40

–40

672

0

32

65

20

68

25

80

176

2.5

120

248

0.78

150

304

0.37

TRANSMISSION
OIL
TEMPERATURE
SENSOR
INPUT

GROUND

TRANSMISSION
CONTROL
MODULE (TCM)

AUTOMATIC
TRANSMISSION

M-6

M-6

3(C)

5(D)

C-96

TRANSMISSION
OIL
TEMPERATURE
SENSOR

H-38

GRY

H-25

1

2

BLU

C1(1)

D1(17)

BLK

BLK

7

C-95

B3(15)

C14(14)

GRY

BLU

BLK

D07LW008

AUTOMATIC TRANSMISSION (4L30-E) 7A1–73

DIAGNOSTIC TROUBLE CODE (DTC) 15

TRANSMISSION OIL TEMPERATURE SHORT TO PLUS OR OPEN

Install scan tool
GOTHROUGH TECH2 CONNECTION.

•

Connect voltmeter between connector
C-96 terminal B3 and connector C-95
ground terminal C1.
IF: If you have more than
approximately 4.74 Volts:

•

Check for a short to plus or open between connector
C-96 terminal B3 and connector C-95 terminal C14.
This faulty connection can be at the connector M-6
terminal 3 (C) or 5 (D). This faulty connection can be
at the intermediate connector H-38 terminals.

•

Repair
If not OK: Disconnect sensor.

•

Connect ohmmeter between sensor terminals 3(C)
and 5(D).
Refer to the table of the resistance function of the
temperature.
If resistance not correct, replace the transmission oil
temperature sensor.

YES

YES

NO

NO

DTC 15 is intermittent.
GOTO INTERMITTENT CONDITIONS.

GOTO TCM MEM-CAL REPLACEMENT.

•

Ignition switch ON. Engine not running.

•

Selector lever position “P”.

•

Select “F0: DATA LIST: Trans. Oil Temp”.

IF: TECH2 DISPLAY more than 4.74 Volts:

7A1–74 AUTOMATIC TRANSMISSION (4L30-E)

DIAGNOSTIC TROUBLE CODE (DTC) 16

TRANSMISSION OIL TEMPERATURE SHORT TO GROUND

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

Circuit Description:

•

The transmission oil temperature sensor is a
thermistor within the internal wiring harness of
the transmission in the adaptor case oil pan. The
Transmission Control Module (TCM) applies 5
volts to the sensor connector M-6 terminal 3(C).
The other side of the sensor is connected to
ground through the TCM terminal C14. When the
transmission oil is cold, the sensor resistance is
high and the TCM will sense high signal voltage.

•

As the transmission oil temperature warms to
normal transmission operating temperature of
80°C (176°F), the sensor resistance becomes less
and the voltage decreases at about 3.5 volts.
Note, for more accuracy the measurement is
done differently for low temperature (less than
45°C) and high temperature (more than 50°C).

•

When DTC16 is set, the transmission will use a

warm value for operation, but the scan tool will
display the actual oil temperature.

•

Table shows thermistor resistance at different
temperatures.

Diagnostic Aids:

•

This Diagnostic is an electrical test done by the
TCM.

•

Detection conditions:
1 Voltage between terminals B3 and C14 < 0.4

volts.

2 The condition needs to be present for at least

20 seconds. Note: during the detection time
the TCM reads the low voltage that defines a
170°C temperature.

•

Action after the detection time: Default Trans-
mission Oil Temperature is set to 100°C.

•

Recovery conditions: To recover when voltage >
or = to 0.4 volts after detection time.

TRANSMISSION
OIL
TEMPERATURE
SENSOR
INPUT

GROUND

TRANSMISSION
CONTROL
MODULE (TCM)

AUTOMATIC
TRANSMISSION

M-6

M-6

3(C)

5(D)

C-96

TRANSMISSION
OIL
TEMPERATURE
SENSOR

H-38

GRY

H-25

1

2

BLU

C1(1)

D1(17)

BLK

BLK

7

C-95

B3(15)

C14(14)

GRY

BLU

BLK

D07LW008

AUTOMATIC TRANSMISSION (4L30-E) 7A1–75

DIAGNOSTIC TROUBLE CODE (DTC) 16

TRANSMISSION OIL TEMPERATURE SHORT TO GROUND

Install scan tool
GOTHROUGH TECH2 CONNECTION.

•

Ignition switch ON. Engine not
running.

•

Selector lever position “P”.

•

Select “F0: DATA LIST: Trans. Oil
Temp”.

IF: TECH2 DISPLAY less than 0.4 Volts:

DTC 16 is intermittent.
GOTO INTERMITTENT CONDITIONS.

GOTO TCM MEM-CAL REPLACEMENT.

YES

YES

NO

NO

•

Check for a short to ground between
connector C-96 terminal B3 and
connector M-6 terminal 3 (C). This
faulty connection can be at the
intermediate connector H-38 terminal
2.

•

Repair
If not OK: Disconnect sensor.

•

Connect ohmmeter between sensor
terminals 3(C) and 5(D).
Refer to the table of the resistance
function of the temperature (DTC 15).
If resistance not correct, replace
sensor.

•

Connect voltmeter between connector
C-96 terminal B3 and connector C-95
ground terminal C1.

IF: If you have less than approximately
0.4 Volts: