Mitsubishi L200. Manual — part 666

IMMOBILIZER SYSTEM

CHASSIS ELECTRICAL

54A-31

DIAGNOSIS CODE PROCEDURES

Code No.B1702: Reception error of key ID

CAUTION

Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
OPERATION
The key reminder switch (ignition key ring antenna)
supplies the ignition key with power, and the ignition
key sends the key ID to the ETACS-ECU. ETACS-
ECU receives the key ID with the key ring antenna,
and judges if the ignition key is the registered one.

TROUBLE JUDGMENT

• Diagnosis code No.B1702 is stored when there

are other ignition keys or anything that interferes
with the communication (things that generate
radio waves such as magnets and an air-cleaning
device that has a power plug) near the ignition
key that is going to start the engine.

• If the key ID is not sent to the ETACS-ECU even

when the ignition switch is turned to the ON posi-
tion, diagnosis code No.B1702 is stored.

NOTE: Diagnosis code No.B1702 is always set
along with MPI system diagnosis code No.P0513.

PROBABLE CAUSES

• Interference of the key ID

• Malfunction of the key ring antenna (antenna

wire)

*

NOTE:

*

: The code No. B1722 will be set if a trouble

occurs in the key ring antenna.

• Malfunction of ignition key

• Malfunction of ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the diagnosis code No.B1722 is
set.

Q: Is the diagnosis code No.B1722 set?

YES :

Refer to

P.54A-32

.

NO :

Go to Step 2

STEP 2. Check the ignition key inserted in the
key cylinder for interference.

Q: Are there other ignition keys or anything that

interferes with the communication (things that
generate radio waves such as magnets and an air-
cleaning device that has a power plug) near the
ignition key inserted in the key cylinder?
YES :

Move away or remove other ignition keys or

things that interfere with the communication
(things that generate radio waves such as
magnets and a air-cleaning device that has
a power plug) near the ignition key. Then,
go to step 4.

NO :

Go to Step 3

STEP 3. Check with the spare key that has
already been registered.
Check that the engine starts using the spare key that
has already been registered.

Q: Is diagnosis code No.B1702 set?

YES :

Replace the ETACS-ECU and register the

ID codes again (Refer to

P.54A-39

). After

registering the ID codes, go to Step 4.

NO :

Replace the ignition key for which diagnosis
code No.B1702 is set, and register the ID
codes again (Refer to

P.54A-39

). After

registering the ID codes, go to Step 4.

STEP 4. Check whether the diagnosis code is
reset.
(1) Turn the ignition switch to the "LOCK" (OFF)

position once, and then turn it to the ON position
again.

(2) On completion, check that diagnosis code

No.B1702 is not reset.

Q: Is diagnosis code No.B1702 set?

B1761

Chassis No. not recorded

P.54A-36

B1766

Transponder registered for other vehicle

P.54A-36

U1073

Bus off

Refer to ETACS

P.54A-

501

.

Code No.

Diagnosis contents

Reference page

IMMOBILIZER SYSTEM

CHASSIS ELECTRICAL

54A-32

YES :

Return to Step 1.

NO :

The diagnosis is complete. If another
diagnosis code is set, refer to Diagnosis
Code Chart

P.54A-30

.

Code No.B1703: Key ID inconsistent

CAUTION

Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
TROUBLE JUDGMENT
When the key ID that is sent from the transponder
does not correspond to the key ID registered in the
ETACS-ECU, the ETACS-ECU sets diagnosis code
No.B1703.
NOTE: Diagnosis code No.B1703 is always set
along with MPI system diagnosis code No.P0513.

PROBABLE CAUSES

• Ignition key (key ID) is not registered

• Malfunction of ETACS-ECU

DIAGNOSIS PROCEDURE

Register all the ignition key IDs again, and
recheck the diagnosis code.
(1) Register all the ignition keys again (Refer to

P.54A-39

).

(2) Turn the ignition switch from the "LOCK" (OFF)

position to the ON position.

(3) Check that diagnosis code No.B1703 is not reset.

Q: Is diagnosis code No.B1703 set?

YES :

Replace the ETACS-ECU and register the

ID codes (Refer to

P.54A-39

). After

registering the ID codes, check if the
diagnosis code is set.

NO :

The diagnosis is complete. If another
diagnosis code is set, refer to Diagnosis
Code Chart

P.54A-30

.

Code No. B1722: Transponder antenna failure

Key Reminder Switch (Ignition Key Ring Antenna) and ETACS-ECU Circuit

ETACS-ECU

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

KEY REMINDER
SWITCH

IGNITION KEY
RING ANTENNA

TRANSPONDER

IMMOBILIZER SYSTEM

CHASSIS ELECTRICAL

54A-33

TROUBLE JUDGEMENT
Diagnosis code No.B1722 is stored when the
ETACS-ECU cannot communicate with the ignition
key because of defective key ring antenna (antenna
wire).

COMMENT ON TROUBLE SYMPTOM

Current trouble

• The wiring harness wire or connectors between

the ETACS-ECU and the key ring antenna may
have loose, corroded, or damage terminals, or
terminals pushed back in the connector, or the
key ring antenna (antenna wire) may be defec-
tive.

Past trouble

• If diagnosis code No.B1722 is stored as a past

trouble, it is possible that there were defective
wiring harnesses, defective connectors or defec-
tive antennas before.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the key ring antenna (antenna

wire)

• Malfunction of ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the key reminder switch (ignition
key ring antenna)

(1) Disconnect the key reminder switch (ignition key

ring antenna) connector C-301.

(2) Take the measurements below at component-

side connector.
There should be continuity between terminals 3,
7 and body earth.

OK: Continuity exists (2

Ω or less)

Q: Is the check result satisfactory?

YES :

Go to Step 2.

NO :

Replace the key reminder switch (ignition
key ring antenna), and then go to Step 5 .

AC600689AG

Harness side

Connector: C-301 <LHD>

AC601122 AC

Harness side

Connector: C-301 <RHD>

AC403234DH

Connector C-301
(Harness side)

IMMOBILIZER SYSTEM

CHASSIS ELECTRICAL

54A-34

STEP 2. Connector check: ETACS-ECU
connector C-219 and key reminder switch
(ignition key ring antenna) connector C-301.

Q: Is the check result satisfactory?

YES :

Go to Step 3.

NO :

Repair the connector, and then go to Step 4.

STEP 3. Check the wiring harness between
ETACS-ECU connector C-219 (terminal 57 and
58) and key reminder switch (ignition key ring
antenna) connector C-301 (terminal 3 and 7).

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the wiring harness, and then go to
Step 4.

AC600752

Connector: C-219 <LHD>

AC

C-219 (GR)

Harness side

Junction block
(Front view)

AC600758

Connector: C-219 <RHD>

AB

C-219 (GR)

Harness side

Junction block
(Rear view)

AC600689AG

Harness side

Connector: C-301 <LHD>

AC601122 AC

Harness side

Connector: C-301 <RHD>

AC600752

Connector: C-219 <LHD>

AC

C-219 (GR)

Harness side

Junction block
(Front view)

AC600758

Connector: C-219 <RHD>

AB

C-219 (GR)

Harness side

Junction block
(Rear view)

AC600689AG

Harness side

Connector: C-301 <LHD>

AC601122 AC

Harness side

Connector: C-301 <RHD>