Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 217

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-67

CIRCUIT OPERATION

•

5-volt voltage is applied to the engine coolant
temperature sensor output terminal (terminal 1)
from the ECM (terminal 44) <M/T> or PCM
(terminal 44) <A/T> via the resistor in the ECM
<M/T> or PCM <A/T>. The ground terminal
(terminal 2) is grounded with ECM (terminal 49)
<M/T> or PCM (terminal 57) <A/T>.

•

The engine coolant temperature sensor is a
negative temperature coefficient type of resistor.
It has the characteristic that when the engine
coolant temperature rises the resistor decreases.

•

The engine coolant temperature sensor output
voltage increases when the resistor increases
and decreases when the resistor decreases.

TECHNICAL DESCRIPTION

•

The engine coolant temperature sensor converts
the engine coolant temperature to a voltage and
output it.

•

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

DTC SET CONDITIONS

Check Conditions

•

Engine coolant temperature was 7

C (44.6

F) or

more immediately before the engine was stopped
at the last drive.

•

Engine coolant temperature was 7

C (44.6

F) or

more when the engine started.

Judgement Criteria

•

Engine coolant temperature fluctuates within 1

(33.8

F) after five minutes have passed since the

engine was started.

•

However, time is not counted if any of the
following conditions are met.

1. Intake air temperature is 60

C (140

F) or

more.

2. Volume air flow sensor output frequency is 70

Hz or less.

3. During fuel shut-off operation.

•

Only one monitor during one drive cycle

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

•

Engine coolant temperature sensor failed.

•

Open or shorted engine coolant temperature
sensor circuit, or loose connector.

•

ECM failed. <M/T>

•

PCM failed. <A/T>

DIAGNOSIS

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

ACX02490

CONNECTOR : B-11

ENGINE
COOLANT
TEMPERATURE
SENSOR

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-68

STEP 1. Using scan tool MB991502, check data list item 21:
Engine Coolant Temperature 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

21, Engine Coolant Temperature Sensor.

•

The engine coolant temperature and temperature
shown with the scan tool should approximately match.

(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 the sensor output voltage at engine coolant
temperature sensor connector B-11 by backprobing.
(1) Do not disconnect the connector B-11.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground by

backprobing.

•

When engine coolant temperature is 0

C(32

F),

voltage should be 3.2 and 3.8 volts.

•

When engine coolant temperature is 20

C(68

F),

voltage should be 2.3 and 2.9 volts.

•

When engine coolant temperature is 40

C(104

F),

voltage should be 1.3 and 1.9 volts.

•

When engine coolant temperature is 80

C(176

F),

voltage should be 0.3 and 0.9 volts.

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

Q: Is the voltage normal?

YES : Go to Step 3.
NO : Go to Step 5.

STEP 3. Check connector B-11 at the engine coolant
temperature sensor for damage.
Q: Is the connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 14.

AKX01177

16 PIN

MB991502

AK000233

B-11 CONNECTOR
HARNESS
SIDE VIEW

1 2

ACX02490

CONNECTOR : B-11

ENGINE
COOLANT
TEMPERATURE
SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-69

STEP 4. Using scan tool MB991502, check data list item 21:
Engine Coolant Temperature Sensor.

CAUTION

21, Engine Coolant Temperature Sensor.

•

The engine coolant temperature and temperature
shown with the scan tool should approximately match.

(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 : Replace the ECM or PCM. Then go to Step 14.

STEP 5. Check connector B-11 at engine coolant
temperature sensor for damage.
Q: Is the connector in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 14.

STEP 6. Check the sensor supply voltage at engine
coolant temperature sensor harness side connector B-11.
(1) Disconnect the connector B-11 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground.

•

Voltage should be between 4.5 and 4.9 volts

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

Q: Is the voltage normal?

YES : Go to Step 8.
NO : Go to Step 7.

AKX01177

16 PIN

MB991502

ACX02490

CONNECTOR : B-11

ENGINE
COOLANT
TEMPERATURE
SENSOR

AK000234

B-11 HARNESS
SIDE CONNECTOR

2 1

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-70

STEP 7. Check connector C-58 at ECM <M/T> or connector
C-55 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Replace the ECM or PCM. Then go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 14.

STEP 8. Check the continuity at engine coolant
temperature sensor harness side connector B-11.
(1) Disconnect the connector B-11 and measure at the harness

side.

(2) Check for the continuity between terminal 2 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Go to Step 11.
NO : Go to Step 9.

STEP 9. Check connector C-58 at ECM <M/T> or connector
C-55 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 14.

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

AK000235

B-11 HARNESS
SIDE CONNECTOR

2 1

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

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