Mitsubishi L200. Manual — part 123

TROUBLESHOOTING

DIESEL FUEL

13A-288

OPERATION

• The electrical current source is supplied from the

engine control relay (terminal No. 3) to the glow
control unit (terminal No. 6). Also, it is supplied
from the glow control unit (terminal No. 7) to the
body earth.

• The request signal of operating the glow plug is

input into the glow control unit (terminal No. 1)
from the engine-ECU (terminal No.120).

• The voltage for the glow plug is applied from the

battery to the glow control unit (terminal No.10).

• The voltage is applied from the glow control unit

(terminal No.1, 2, 3 and 4) to each glow plug.

• The diagnosis signal is output from the glow con-

trol unit (terminal No. 9) to the engine-ECU (ter-
minal No.126).

FUNCTION

• The voltage applied to the glow control unit (ter-

minal No.10) from the battery is applied to each
glow plug in the duty ratio according to the signal
from the engine ECU.

TROUBLE JUDGMENT

Check Conditions

• While the engine is running

• The electrical continuity duty to the glow plug is

17

− 83 %.

Judgment Criterion

• When a failure of the glow control unit body is

detected.

PROBABLE CAUSES

• Failed glow control unit

• Open/short circuit or harness damage in glow

plug power supply circuit or loose connector con-
tact.

• Failed engine-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: A-151 glow control
unit connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair or replace the connector.

STEP 2. Perform voltage measurement at A-151
glow control unit connector.

• Disconnect connector, and measure at harness

side.

• Voltage between terminal No.10 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Check and repair harness between A-151

(terminal No.10) glow control unit connector
and battery (fusible link 24).

• Check power supply line for open/

short circuit.

AKB00264

4 3 2 1
8 7 6 5

11 10 9

AB

A-151 (B)

Harness side
connector

Connector: A-151

AKB00264

4 3 2 1
8 7 6 5

11 10 9

AB

A-151 (B)

Harness side
connector

Connector: A-151

TROUBLESHOOTING

DIESEL FUEL

13A-289

STEP 3. Check harness between A-151 (terminal
No. 10) glow control unit connector and battery
(fusible link 24).

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Repair the damaged harness wire.

STEP 4. M.U.T.-III diagnosis code.

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES :

Go to Step 5 .

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use Troubleshooting/

Inspection Service points

− How to Cope

with intermittent Malfunctions ).

STEP 5. Replace the glow control unit.

• After replacing the glow control unit, reconfirm

whether the diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Replace the engine-ECU. When the engine-

ECU is replaced, write the chassis number
(Refer to GROUP 00

− Precautions Before

Service

− How to Perform Chassis Number

Writing ). After replacing the engine-ECU,
register the injector identification code and
learn fuel injection (Refer to GROUP 00

−

Precautions Before Service

− What The

Common Rail Engine Learns ). After
registering the injector identification code,
carry out the forcible DPF regeneration.
(Refer to GROUP 17

− Emission Control −

Diesel Particulate Filter (DPF) System

−

Forcible DPF Regeneration ).

NO :

Check is end.

Code No. P0652: Analog Sensor Reference Voltage No. 2 Too Low

FUNCTION

• The engine-ECU applies 5 V to the sensors other

than the accelerator pedal position sensor (main)

• The engine-ECU checks whether the supply volt-

age is within the specified range.

TROUBLE JUDGMENT

Check Conditions

• Battery positive voltage is 8 − 16 V

• 2 seconds later after the ignition switch has been

in "ON" position or the engine has started up

Judgment Criterion

• The detected voltage of analog sensor reference

voltage No. 2 is 4.86 V or less for 0.5 second.
[Power supply for other than accelerator pedal
position sensor (main)]

PROBABLE CAUSE

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

• After erasing the diagnosis code through M.U.T.-

III, ignition switch is "ON" position and confirm
whether the diagnosis code is output.

Q: Is the diagnosis code set?

AKB00264

4 3 2 1
8 7 6 5

11 10 9

AB

A-151 (B)

Harness side
connector

Connector: A-151

TROUBLESHOOTING

DIESEL FUEL

13A-290

YES :

Replace the engine-ECU. When the engine-

ECU is replaced, write the chassis number
(Refer to GROUP 00

− Precautions Before

Service

− How to Perform Chassis Number

Writing ). After replacing the engine-ECU,
register the injector identification code and
learn fuel injection (Refer to GROUP 00

−

Precautions Before Service

− What The

Common Rail Engine Learns ). After
registering the injector identification code,
the vehicle equipped with the DPF carries
out the forcible DPF regeneration. (Refer to
GROUP 17

− Emission Control − Diesel

Particulate Filter (DPF) System

− Forcible

DPF Regeneration ).

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use Troubleshooting/

Inspection Service Points

− How to Cope

with Intermittent Malfunctions ).

Code No. P0653: Analog Sensor Reference Voltage No. 2 Too High

FUNCTION

• The engine-ECU applies 5 V to the sensors other

than the accelerator pedal position sensor (main).

• The engine-ECU checks whether the supply volt-

age is within the specified range.

TROUBLE JUDGMENT

Check Conditions

• Battery positive voltage is 8 − 16 V

• 2 seconds later after the ignition switch has been

in "ON" position or the engine has started up

Judgment Criterion

• The detected voltage of analog sensor reference

voltage No. 2 is 5.14 V or more for 0.5 second.
[Power supply for other than accelerator pedal
position sensor (main)]

PROBABLE CAUSE

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

• After erasing the diagnosis code through M.U.T.-

III, ignition switch is "ON" position and confirm
whether the diagnosis code is output.

Q: Is the diagnosis code set?

YES :

Replace the engine-ECU. When the engine-

ECU is replaced, write the chassis number
(Refer to GROUP 00

− Precautions Before

Service

− How to Perform Chassis Number

Writing ). After replacing the engine-ECU,
register the injector identification code and
learn fuel injection (Refer to GROUP 00

−

Precautions Before Service

− What The

Common Rail Engine Learns ). After
registering the injector identification code,
the vehicle equipped with the DPF carries
out the forcible DPF regeneration. (Refer to
GROUP 17

− Emission Control − Diesel

Particulate Filter (DPF) System

− Forcible

DPF Regeneration ).

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use Troubleshooting/

Inspection Service Points

− How to Cope

with Intermittent Malfunctions ).

TROUBLESHOOTING

DIESEL FUEL

13A-291

Code No. P0683: Glow Control Unit Communication Abnormality <Euro5>

1

2

3
4

1

1

1

1

AKB00259

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Grey
R: Red P: Pink V: Violet PU: Purple SI: Silver

W

Glow System Circuit

Engine control relay

Glow control unit

A-20X

R

To engine-ECU

10

20A

Fusible link

Relay
box

W-R

W-B

W-B

W-B

23

Fusible link 24

2

3

6

1

9

120

126

7

1

2

3

4

2

Y

Y

B

GR-R

LG-R

L

BR-Y

G

G-R

R

L-B

1

4

3

A-150

1

A-153

C-103

Engine-
ECU

No.1
Glow plug

No.2
Glow plug

No.3
Glow plug

No.4
Glow plug

A-154

A-155

A-156

1

1

1

GND

10

OFF

ON

1

4

A-115

A-151

3

AB