Mitsubishi Outlander XL. Manual - part 248

DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control

M11310100184USA0000010000

ZK602836

1 2

1 2

1

2

3 4 5 6 7 8 9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

YELLO

W

-GREEN

YELLO

W

-BLUE

ENGINE
CONTROL
MODULE

ENGINE COOLANT
TEMPERATURE SENSOR

B-09

(MU802406)

B-10

ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT

2

27

1

26

AA00

5V

ZK603598

Engine coolant
temperature sensor

AA00

Exhaust gas
recirculation valve

B-09 (B)

Connector: B-09

ZK603591

ECM

B-10 (GR)

Connector: B-10

AA00

 

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-187

DIAGNOSTIC TROUBLE CODE PROCEDURES

CIRCUIT OPERATION

｠

5-volt  voltage  is  applied  to  the  engine  coolant
temperature sensor output terminal (terminal No. 1)
from the ECM (terminal No. 26) via the resistor in
the ECM. The ground terminal (terminal No. 2) is
grounded with ECM (terminal No. 27).

｠

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 resistance decreases.

｠

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

TECHNICAL DESCRIPTION

｠

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

｠

The  ECM  checks  whether  this  voltage  is  within  a
specified range.

DESCRIPTIONS OF MONITOR METHODS

｠

Engine coolant temperature sensor output voltage
drops from over 40°C (104°F) to under 40°C (104°
F) and keeps under 40°C (104°F) for 5 minutes.

｠

Engine coolant temperature sensor output voltage
does  not  reach  close  loop  enable  temperature
within  specified  period  when  engine  coolant
temperature sensor output voltage at engine start is
under 7°C (45°F).

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)

Other Monitor (There is no temporary DTC stored in
memory for the item monitored below)

｠

Not applicable

Sensor (The sensor below is determined to be
normal)

｠

Engine coolant temperature sensor

｠

Intake air temperature sensor

13Ab-188

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC SET CONDITIONS <Range/Performance problem - low input (time to reach closed loop
temperature)>

Logic Flow Chart

Start

End

Yes

No

No

Yes

Malfunction

Good

Time has passed

After starting?

Engine

coolant

temp.

Closed loop

enable temp.

>

Monitoring

conditions?

No

Yes

ZK603704 AA00

Check Conditions, Judgement Criteria

｠

About 60 - 300 seconds have passed for the engine
coolant temperature to rise to about 7°C (44.6°F)
after starting sequence was completed.

｠

However, time is not counted when fuel is shut off.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-189

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC SET CONDITIONS <Range/Performance problem - drift>

Logic Flow Chart

Start

End

No

No

Yes

Yes

Malfunction

Good

Under 40degC

300secs have passed?

No

Yes

Over 40degC

Yes

Over 40degC

No

ZK603705 AA00

Check Conditions, Judgement Criteria

｠

Engine coolant temperature decreases from higher
than 40°C (104°F) to lower than 40°C (104°F).

｠

Then the engine coolant temperature has continued
to be 40°C (104°F) or lower for 5 minutes.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle -
Pattern 9 P.13Ab-8.

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

｠

Engine coolant temperature sensor failed.

｠

Harness damage

｠

Connector damage

｠

ECM failed.

 

13Ab-190

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES