Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 645

7A1–80 AUTOMATIC TRANSMISSION (4L30-E)

DIAGNOSTIC TROUBLE CODE (DTC) 23

THROTTLE POSITION SENSOR CONNECTOR OPEN

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

Circuit Description:

•

The Throttle Position Sensor (TPS) provides a
voltage signal that changes relative to the throttle
plate position. Signal voltage between connector
C-95 terminals C5 and C6 will vary from about 0.4
at idle to about 4.6 volts at wide open throttle.

•

The Engine Control Module (ECM) also receives
this signal. This TPS is a variable resistance with
one side (connector E-68 terminal 1) connected
only to the ECM connector to have the 5 volts
supply voltage. The other side (connector E-68
terminal 3) is connected to the Transmission
Control Module (TCM) (floating ground) and the
ECM (ground). The “middle” (the wiper) (con-
nector E-68 terminal 2) is connected to the TCM
and the ECM.

•

The ECM monitors output voltage from the TPS
and determines fuel delivery based on throttle
valve angle (driver demand).

•

This TPS is an electrical component and must not
be soaked in any liquid cleaner or solvent, as
damage may result.

Diagnostic Aids:

•

This Diagnostic is not an electrical test done by
the TCM but a test between different information
(“logic test”).

•

Detection conditions:
1 This detects the terminals C5 and C6 open or

the connector E-68 open.

2 Throttle value opening > 42%.
3 Engine Speed < 2200 RPM.
4 Vehicle Speed <3 Km/h.
5 No DTC: Engine Speed DTC13, Output Speed

DTC11. Downshift Protection DTC62.

6 Only with Selector Lever in Park or Neutral.
7 The detection is authorized only during 6

seconds after ignition switch ON.

8 The conditions need to be present for at least

3 seconds.

•

Action after the detection time: BACKUP MODE.

•

Recovery conditions: To recover do an IGNITION
CYCLE.

TPS
INPUT

GROUND

TRANSMISSION
CONTROL
MODULE(TCM)

C-95

C5(5)

H-25

C6(6)

GRN

BLU

GRN

5VOLT
REFERENCE

TPS
INPUT

GROUND

GRY

THROTTLE
POSITION
SENSOR
(TPS)

ENGINE
CONTROL
MODULE
(ECM)

39 E-61

E-68

D07LW009

AUTOMATIC TRANSMISSION (4L30-E) 7A1–81

DIAGNOSTIC TROUBLE CODE (DTC) 23

THROTTLE POSITION SENSOR CONNECTOR OPEN

Check Engine Control Module (ECM)
DTC.
IF: DTC on Throttle Position Sensor (TPS)
exists:

Check diagnosis of ECM and repair.

•

Install scan tool GOTHROUGH TECH2
CONNECTION.

•

Ignition switch ON, engine not
running.

•

Selector lever position “P”.

•

Select F0: DATA LIST: “TPS SIGNAL”.

IF: TECH2 DISPLAY approx. 2.5 volts
whatever the throttle valve position:

IF: TPS connector E-68
on the engine is open:

DTC 23 is intermittent.
GOTO INTERMITTENT
CONDITIONS.

Repair.

•

Ignition switch OFF. Disconnect connector C-95.
Connect ohmmeter between connector C-95 terminals C5 and C6.
If open circuit:

•

Check for an open between connector C-95 terminal C5 to connector
E-68 terminal 2 with a simultaneous open of the terminal C6 to the
connector E-68 terminal 3.
This faulty connection can be at the intermediate connector H-25
terminal 5 and 3.

•

Repair.
If not OK: Ignition switch OFF. Disconnect sensor.

•

Connect ohmmeter between sensor terminals 2 wiper and 3 low
side.
If resistance between TPS terminal 2 and 3 does not change when
the throttle valve angle is changed: Replace TPS.

YES

7A1–82 AUTOMATIC TRANSMISSION (4L30-E)

DIAGNOSTIC TROUBLE CODE (DTC) 25

SUPPLY VOLTAGE TOO LOW

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

Circuit Description:

The ignition voltage of Transmission Control
Module (TCM) terminals A7 and A8 is monitored by
the TCM and when the voltage is too low (approx. 9
volts) the DTC25 is stored and the BACKUP MODE
is set.

Diagnostic Aids:

•

This Diagnostic is an electrical test done by the
TCM.

•

Detection conditions:

Ignition voltage measured between TCM
terminal A7 or A8 and ground C1 is lower
than specification.

Specification decreases with the transmission
oil temperature:
–40°C (–40°F) = 8.7 volts
90°C (194°F) = 9.0 volts
150°C (304°F) = 9.2 volts

2 The condition needs to be present for at least

1 second

•

Action after the detection time: BACKUP MODE

•

Recovery conditions: To recover, the ignition
voltage must be higher than specification.
Specification decreases with the transmission oil
temperature:

–40°C (–40°F) = 9.2 volts
90°C (194°F) = 9.5 volts
150°C (304°F) = 9.6 volts

BATTERY

FUSE

ENGINE
CONTROL
MODULE
(ECM)

BATTERY INPUT

EB-12
10A

EB-14
20A

RELAY &
FUSE BOX

X-18

ECM
MAIN
RELAY

E-61

E-60

BATTERY
INPUT

A4
(4)

C1
(1)

D1
(17)

TRANSMISSION
CONTROL MODULE
(TCM)

—

RED/
GRN

GRN

H-25

RED/BLU

BLU/RED

A7
(7)

BLK

C-95

C-96

A8
(8)

GROUND

IGNITION
INPUT

D07LW010

AUTOMATIC TRANSMISSION (4L30-E) 7A1–83

DIAGNOSTIC TROUBLE CODE (DTC) 25

SUPPLY VOLTAGE TOO LOW

•

Ignition switch ON. Engine OFF.

•

Connect voltmeter between B+ and B- terminals of
battery.

IF: Display greater than 9 volts:

•

Engine running.

•

Connect voltmeter between B+ and B- terminals of
battery.

IF: display between 13 and 16 volts?

•

Ignition switch OFF.

•

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

•

Ignition switch ON. Engine OFF.

•

Connect voltmeter between connector C-96 terminal
A7 and connector C-95 terminal C1.

IF: Display greater than 9 volts:

Check for faulty connection and if OK.
GOTO INTERMITTENT CONDITIONS.

Check fuse and wire to A7, A8 and C1 for
open circuit.

Check regulator.

Check battery.

YES

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