Mitsubishi Outlander XL. Manual - part 688

PROBABLE CAUSES

｠

Malfunction of ETACS-ECU

｠

Engine ECU malfunction

｠

ETACS-ECUs have been interchanged between two vehicles.

｠

ASC-ECU malfunction

｠

ASC-ECUs have been interchanged between two vehicles.

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

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.

Q:Is the check result normal?

YES:

 Go to Step 3.

NO:

 Repair the CAN bus lines. (Refer to GROUP 54D - CAN

Bus Diagnostics table P.54D-17.) On completion, go to
Step 2.

STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines

Q:Is DTC U1417 set?

YES:

 Go to Step 3.

NO:

 The procedure is complete.

STEP 3. M.U.T.-III diagnostic trouble code
Use scan tool to check diagnostic trouble code C121C is set or
not.

Q:Is DTC C121C set?

YES:

 Troubleshoot for the relevant diagnostic trouble

code.

NO:

 Go to Step 4.

STEP 4. M.U.T.-III other system diagnostic trouble code
Use  scan  tool  to  check  whether  the  ETACS-ECU-related  or
engine ECU-related diagnostic trouble code is set or not.

Q:Is any DTC set?

YES:

 Troubleshoot for the relevant diagnostic trouble

code.

NO:

 Go to Step 5.

STEP 5. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.

OK: 8637A213

Q:Is the check result normal?

YES:

 Go to Step 6.

NO:

 Replace ETACS-ECU.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-159

DIAGNOSIS

STEP 6. Check part number of ASC-ECU
Check the part number of ASC-ECU.

OK: 4670A251

Q:Is the check result normal?

YES:

 Go to Step 7.

NO:

 Replace the ASC-ECU.

STEP 7. Check whether the diagnostic trouble code is reset.

Q:Is DTC U1417 set?

YES:

 Replace the ASC-ECU.

NO:

 The procedure is complete.

SYMPTOM CHART

M13506100082USA0000010000

｠

ABS  may  operate  in  the  following  conditions
without  hard  braking:  Slippery  road  surface,
high-speed  turn,  and  bumpy  road  surface.
When asking the customers, confirm that they
have/have  not  encountered  ABS  operation  in
corresponding conditions.

｠

During ABS operation, the brake pedal is pulled
forward gradually, and the noise occurs at the
same  time.  This  is  because  the  brake  line

pressure  varies  intermittently  to  prevent  the
wheel lock, and not a system malfunction.

｠

During  diagnosis,  a  diagnostic  trouble  code
associated with other system may be set when
the ignition switch is turned on with connector
(s)  disconnected.  On  completion,  confirm  all
systems  for  diagnostic  trouble  code(s).  If
diagnostic trouble code(s) are set, erase them
all.

Symptoms

Inspection
procedure
No.

Reference
page

M.U.T.-III cannot communicate only with ASC-ECU.

1

 P.35C-161

ASC OFF indicator light flashes at a rate of 2Hz.

2

 P.35C-162

Brake warning light stays ON with the parking brake lever released.

3

 P.35C-162

ABS warning light does not illuminate when ignition switch is turned to the ON
position (Engine stopped).

4

 P.35C-166

Brake warning light does not illuminate when the ignition switch is turned to
ON position (Engine stopped).

5

 P.35C-167

ABS warning light stays ON

6

 P.35C-168

ASC indicator light stays ON

7

 P.35C-169

ASC-OFF indicator light stays ON after the engine is started.

8

 P.35C-170

After ASC switch is turned OFF, TCL/ASC system cannot be disabled.

9

 P.35C-172

Abnormality in brake operation

10

 P.35C-174

Traction control function or skid control function inoperative

11

 P.35C-174

ASC-ECU power supply circuit system

12

 P.35C-176

35C-160

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

SYMPTOM PROCEDURES

Inspection Procedure 1: Scan tool cannot communication only with ASC-ECU.

M13506100084USA0000010000

TECHNICAL DESCRIPTION (COMMENT)
When  scan  tool  cannot  communicate  with  the  ABS/TCL/ASC
system,  the  CAN  bus  line,  ASC-ECU  power  supply  circuit
system, or ASC-ECU may be faulty.

TROUBLESHOOTING HINTS (The most likely causes for
this case:)

｠

Damaged wiring harness and connectors

｠

ASC-ECU malfunction

｠

Wrong routing of M.U.T.-III harness

｠

Abnormality in battery or generator

｠

Abnormality in power supply voltage to ASC-ECU

｠

ECU malfunction of other system

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

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.

Q:Is the check result normal?

YES:

 Check and repair the power supply circuit system.

(Refer to P.35C-176.) Then go to Step 2.

NO:

 Repair the CAN bus lines. (Refer to GROUP 54D - CAN

Bus Diagnostics table P.54D-17.) Then go to Step 2.

STEP 2. Retest the system
Check the communication with the scan tool.

Q:Is the check result normal?

YES:

 This diagnosis is complete.

NO:

 Replace the ASC-ECU.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-161

DIAGNOSIS

Inspection Procedure 2: ASC OFF Indicator Light Flashes at a Rate of 2Hz.

M13506100085USA0000010000

SYSTEM OPERATION
When ASC OFF indicator light flashes at a rate of 2 Hz, traction
control by brake force is prohibited.

TECHNICAL DESCRIPTION (COMMENT)
This operation is performed for the following reasons and is not
a malfunction.

｠

ASC-ECU calculates the estimated temperature of the brake
pad. In general, as the brake pad temperature increases, the
coefficient  of  friction  for  the  brake  pad  becomes  smaller,
resulting  in  the  reduced  braking  force.  When  the  estimated
temperature of the brake pad exceeds the specification, ASC-
ECU flashes the ASC OFF indicator light at a rate of 2 Hz to
warn the driver that the controllability of TCL is decreased by
the reduced braking force. Consequently, ASC-ECU prohibits
the traction control by brake force until it determines that the
estimated temperature of the brake pad is at normal value.

TROUBLESHOOTING HINTS (The most likely causes for
this case:)

｠

Overheat of brake pad

Inspection Procedure 3: Brake Warning Light Stays ON with the Parking Brake Lever
Released.

M13506100086USA0000010000

35C-162

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS