Mitsubishi Galant. Manual — part 395

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-47

STEP 16. Check harness for damage between throttle
position sensor connector B-05 terminal 3 and PCM
connector C-41 terminal 78.
Q: Is the harness wire in good condition?

YES : Go to Step 17.
NO : Repair it.

STEP 17. Check harness for damage between throttle
position sensor connector B-05 terminal 1 and PCM
connector C-40 terminal 57.
Q: Is the harness wire in good condition?

YES : Throttle position sensor adjustment. Refer to GROUP

13A <2.4L Engine>, On-vehicle Service

−

Throttle

Position Sensor Adjustment

P.13A-437

or 13B <3.0L

Engine>, On-vehicle Service

−

Throttle Position

Sensor Adjustment

P.13B-519

.

NO : Repair it.

AC001831AD

CONNECTOR: B-05

<2.4L ENGINE>

<3.0L ENGINE>

AC004197

PCM

AC

CONNECTOR: C-41

AC001831AD

CONNECTOR: B-05

<2.4L ENGINE>

<3.0L ENGINE>

AC004197

PCM

AD

CONNECTOR: C-40

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-48

DTC 12: Throttle Position Sensor System (Open Circuit)

Throttle Position Sensor System Circuit
Refer to

P.23A-39

.

CIRCUIT OPERATION
Refer to

P.23A-39

.

DTC SET CONDITIONS
If TPS output voltage is 0.2 volts or lower at times
other than when the engine is idling, the output is
judged to be too low and diagnostic trouble code
number "12" is output.

TROUBLESHOOTING HINTS (The most likely

causes for this code to be set:)

•

Malfunction of the throttle position sensor circuit

•

Damaged harness, connector

•

Malfunction of the PCM

DIAGNOSIS

Required Special Tool:
MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 11:
Throttle Position Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Set scan tool MB991502 to data reading mode for item 11:

Throttle Position Sensor.

•

With the throttle valve in idle position, voltage should be
between 535 and 735 mV.

•

With the throttle valve in full-open position, voltage
should be between 4,500 and 5,500 mV.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : This malfunction is intermittent. Refer to GROUP 00,

How to Use Troubleshooting/Inspection Service
Points

−

How to Cope with Intermittent Malfunction

P.00-8

.

NO : Go to Step 2.

AC003081AC

MB991502

DATA LINK
CONNECTOR

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-49

STEP 2. Check the sensor output voltage at throttle
position sensor connector B-05 by backprobing.
(1) Do not disconnect connector B-05.
(2) Turn the ignition switch to "ON" position.

(3) Measure the voltage between terminal 3 and ground by

backprobing.

•

With the throttle valve in idle position, voltage should be
between 0.535 and 0.735 volts.

•

With the throttle valve in full-open position, voltage
should be between 4.5 and 5.5 volts.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 3.
NO : Go to Step 7.

STEP 3. Check the sensor output voltage at PCM
connector C-41 by backprobing.
(1) Do not disconnect connector C-41.
(2) Turn the ignition switch to "ON" position.

(3) Measure the voltage between terminal 78 and ground by

backprobing.

•

With the throttle valve in idle position, voltage should be
between 0.535 and 0.735 volts.

•

With the throttle valve in full-open position, voltage
should be between 4.5 and 5.5 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 4.
NO : Go to Step 6.

AC001831AD

CONNECTOR: B-05

<2.4L ENGINE>

<3.0L ENGINE>

AC001548

B-05 CONNECTOR
HARNESS SIDE VIEW

AD

AC004197

PCM

AC

CONNECTOR: C-41

AC000847AE

C-41 CONNECTOR
HARNESS SIDE VIEW

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-50

STEP 4. Check connectors B-05 at the throttle position
sensor and C-41 at PCM for damage.
Q: Are the connectors in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

STEP 5. Using scan tool MB991502, check data list item 11:
Throttle Position Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Set scan tool MB991502 to data reading mode for item 11:

Throttle Position Sensor.

•

With the throttle valve in idle position, voltage should be
between 535 and 735 mV.

•

With the throttle valve in full-open position, voltage
should be between 4,500 and 5,500 mV.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : This malfunction is intermittent. Refer to GROUP 00,

How to Use Troubleshooting/Inspection Service
Points

−

How to Cope with Intermittent Malfunction

P.00-8

.

NO : Replace the PCM.

AC001831AD

CONNECTOR: B-05

<2.4L ENGINE>

<3.0L ENGINE>

AC004197

PCM

AC

CONNECTOR: C-41

AC003081AC

MB991502

DATA LINK
CONNECTOR