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Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 101

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-103

DTC P0123: Throttle Position Circuit High Input

CIRCUIT OPERATION

•

A 5-volt power supply is applied on the TPS
power terminal (terminal 4) from the ECM
(terminal 81) <M/T> or PCM (terminal 46) <A/T>.
The ground terminal (terminal 1) is grounded with
ECM (terminal 92) <M/T> or PCM (terminal 57)
<A/T>.

•

When the throttle valve shaft is turned from the
idle position to the fully opened position, the
resistor between the TPS output terminal
(terminal 3) and ground terminal will increase
according to the rotation.

AK000656

2 3 4

88 89

76 77

72
79
91

73
80

81
92

8283
93

8485

8687

9596

GREEN-YELLO

YELLO

BLA

ENGINE CONTROL
MODULE(ECM)<M/T>
OR
POWERTRAIN CONTROL
MODULE(PCM)<A/T>

92<M/T>
57<A/T>*1

84<M/T>
78<A/T>*2

81<M/T>
46<A/T>*1

C-60<M/T>
(MU803772)

C-54<A/T>
(MU803781)

C-57<A/T>
(MU803782)

AUTO-CRUISE
CONTROL SYSTEM

B-07
(MU802724)

THROTTLE POSITION
SENSOR

NOTE
*1:PCM connector C-54<A/T>
*2:PCM connector C-57<A/T>

89 90 91 92

83 84

42 43
48 49 50 51 52 53 54 55 56 57

58 59

60 61 62 63

64 65 66

ACX02472

CONNECTOR : B-07

THROTTLE
POSITION
SENSOR

AK000280

C-54

C-60

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-60<M/T>,C-54,C-57<A/T>

C-57

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-104

TECHNICAL DESCRIPTION

•

The TPS outputs voltage which corresponds to
the throttle valve opening angle.

•

The ECM <M/T> or PCM <A/T> checks whether
the voltage is within a specified range.

DTC SET CONDITIONS

Check Conditions

•

Two seconds or more have passed since the
staring sequence was completed.

•

Engine speed is lower than 3,000 r/min.

•

Volumetric efficiency is lower than 30 percent.

Judgement Criteria

•

TPS output voltage has continued to be 4.6 volts
or higher for 2 seconds.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

•

TPS failed or maladjusted.

•

Open or shorted TPS circuit, or loose connector.

•

ECM failed. <M/T>

•

PCM failed. <A/T>

DIAGNOSIS

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

STEP 1. Using scan tool MB991502, check data list item 14:
Throttle Position Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "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 the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item

14, Throttle Position Sensor.

•

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

•

With the throttle valve in the 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 sensor operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points (

P.00-6

NO : Go to Step 2.

STEP 2. Check connector B-07 at throttle position sensor
for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 11.

AKX01177

16 PIN

MB991502

ACX02472

CONNECTOR : B-07

THROTTLE
POSITION
SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-105

STEP 3. Check the sensor supply voltage at throttle
position sensor harness side connector B-07.
(1) Disconnect the connector B-07 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 4 and ground.

•

Voltage should be between 4.8 and 5.2 volts.

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

Q: Is the voltage normal?

YES : Go to Step 5.
NO : Go to Step 4.

STEP 4. Check connector C-60 at ECM <M/T> or connector
C-54 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Replace the ECM or PCM. Then go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 11.

STEP 5. Check the continuity at throttle position sensor
harness side connector B-07.
(1) Disconnect the connector B-07 and measure at the harness

side.

(2) Measure the continuity between terminal 1 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Go to Step 8.
NO : Go to Step 6.

AK000236 AB

B-07 HARNESS
SIDE CONNECTOR

4 3 2 1

AK000280

C-54

C-60

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-60<M/T>,C-54<A/T>

AK000237AB

B-07 HARNESS
SIDE CONNECTOR

4 3 2 1

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-106

STEP 6. Check connector C-60 at ECM <M/T> or connector
C-54 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 11.

STEP 7. Check for open circuit and harness damage
between throttle position sensor connector B-07 terminal 1
and ECM connector C-60 terminal 92 <M/T> or PCM
connector C-54 terminal 57 <A/T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 11.
NO : Repair it. Then go to Step 11.

AK000280

C-54

C-60

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-60<M/T>,C-54<A/T>

ACX02472

CONNECTOR : B-07

THROTTLE
POSITION
SENSOR

AK000280

C-54

C-60

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-60<M/T>,C-54<A/T>

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