Mitsubishi Outlander XL. Manual - part 936

ZC6008720004

Connector: A-39

A-39 (Y)

ZC6008750031

Connector: C-33

ZC6008760000

Connector: C-28

C-28 (Y)

 

If  DTC  U0170  is  set  in  the  SRS-ECU,  always
diagnose the CAN main bus line.

CIRCUIT OPERATION
If an impact of set value or more is detected, the front
impact sensor sends the coded acceleration data to
SRS-ECU. Based on the acceleration data, SRS-ECU
determines  the  necessity  of  driver's  and  front
passenger's air bag deployment, and then turns ON
the power supply circuit to the inflator.

DTC SET CONDITIONS
These  DTCs  are  set  if  communication  between  the
front  impact  sensor  (LH)  and  the  SRS-ECU  is  not
possible or faulty.

TROUBLESHOOTING HINTS

｠

Damaged wiring harnesses or connectors

｠

Malfunction of the front impact sensor (LH)

｠

Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:

｠

MB991958: Scan Tool (M.U.T.-III Sub Assembly)

｠

MB991824: Vehicle Communication Interface (V.C.I.)

｠

MB991827: M.U.T.-III USB Cable

｠

MB991910:  M.U.T.-III  Main  Harness  A  (Vehicles  with
CAN communication system)

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-275

SRS AIR BAG DIAGNOSIS

STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition  switch  to  the  "LOCK"  (OFF)  position  before
connecting or disconnecting scan tool MB991958.

(1)

Connect scan tool MB991958. Refer to "How to connect the
scan tool P.52B-31."

(2)

Turn the ignition switch to the "ON" position.

(3)

Diagnose the CAN bus line.

(4)

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

Q:Is the CAN bus line found to be normal?

YES:

 Go to Step 2.

NO:

 Repair the CAN bus line (Refer to GROUP 54D,

Diagnosis P.54D-17).

STEP 2. Recheck for diagnostic trouble code.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

Check again if the DTC is set.

(1)

Erase the DTC.

(2)

Turn the ignition switch to the "ON" position.

(3)

Check if the DTC is set.

(4)

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

Q:Is the DTC set?

YES:

 Go to Step 3.

NO:

 There is an intermittent malfunction such as poor

engaged connector(s) or open circuit (Refer to GROUP 00,
How to Cope with Intermittent Malfunction P.00-15).

STEP 3. Check for any diagnostic trouble code. (Using scan
tool MB991958, read the diagnostic trouble code.)
Check the front impact sensor (LH).

(1)

Disconnect the negative battery terminal.

(2)

Replace the front impact sensor (LH) with the front impact
sensor (RH).

(3)

Connect the negative battery terminal.

52B-276

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

(4)

Erase diagnostic trouble code from memory, and check the
diagnostic trouble code.

Q:Is DTC U0170 set?

YES:

 Replace the front impact sensor (LH) with a new one.

(Refer to P.52B-324). Go to Step 5.

NO:

 Go to Step 4.

STEP 4. Check the harness wires for open circuit or short
circuit between SRS-ECU connector C-28 (terminal No.21
and 22) and front impact sensor (LH) connector A-39
(terminal No.2 and 1).

NOTE: 

After inspecting intermediate connector C-33 inspect

the wiring harness. If the intermediate connector C-33 is
damaged, repair or replace it.

Q:Are the harness wires between SRS-ECU connector C-28

(terminal  No.21  and  22)  and  front  impact  sensor  (LH)

connector A-39 (terminal No.2 and 1) in good condition?

YES:

 Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC U0170 sets, replace
the SRS-ECU (Refer to P.52B-326). Then go to Step 5.

NO:

 Replace the harness wires between SRS-ECU connector

C-28 and front impact sensor (LH) connector A-39. Then go
to Step 5.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-277

SRS AIR BAG DIAGNOSIS

STEP 5. Recheck for diagnostic trouble code.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

Check again if the DTC is set.

(1)

Erase the DTC.

(2)

Turn the ignition switch to the "ON" position.

(3)

Check if the DTC is set.

(4)

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

Q:Is DTC U0170 set?

YES:

 Return to Step 1.

NO:

 The procedure is complete.

DTC U0171: Front Impact Sensor (RH) Communication Error

M15204000973USA0000010000

FRONT IMPACT
SENSOR (RH)

FRONT IMPACT
SENSOR (LH)

SRS-ECU

CPU

CPU

Front Impact Sensor Circuit

ACCELERO
METER

ACCELERO
METER

52B-278

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS