Mitsubishi Lancer Evolution X. Manual - part 20

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-105

DIAGNOSTIC ITEM 8: Diagnose when the scan tool cannot receive the data sent by shift lever. 
<TC-SST>

CAUTION

When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted 

water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.

TRANSAXLE 
ASSEMBLY

ENGINE CONTROL MODULE

CAN-C Communication Circuit <TC-SST>

ETACS-ECU

INTERFACE 
CIRCUIT

CAN DRIVE 
CIRCUIT

JOINT CONNECTOR 
(CAN2)

JOINT CONNECTOR 
(CAN3)

JOINT CONNECTOR 
(CAN4)

SHIFT LEVER

ASC-ECU

STEERING 
WHEEL SENSOR

AWC-ECU

NOTE

: THE TERMINAL NUMBERS DESCRIBED 

IN THE CIRCUIT DIAGRAM AGREE WITH 
THE NUMBERS MARKED ON THE 
TRANSAXLE ASSEMBLY CONNECTOR AND 
HARNESS SIDE CONNECTOR.

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-106

.

FUNCTION

If the scan tool MB991958 cannot communicate with 
the shift lever, this diagnosis result will be set.

.

TROUBLE JUDGMENT CONDITIONS

If a communication flag is not set for the shift lever, 
the ETACS-ECU determines that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN3) or shift lever connector improperly con-
nected]

• Malfunction of the wiring harness [open circuit 

between the shift lever and the joint connector 
(CAN3), power supply circuit to the shift lever]

• Malfunction of the shift lever

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set
• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN3) C-127 and shift 
lever connector C-27 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.

CAUTION

The strand end of the twisted wire should be within 10 cm 
(4 inches) from the connector. For details refer to 

P.54C-7

.

Q: Are joint connector (CAN3) C-127 and shift lever 

connector C-27 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708951CB

Connectors: C-27, C-127

C-27

C-127

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-107

STEP 2. Check the wiring harness between joint connector 
(CAN3) C-127 and shift lever connector C-27.

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to 

P.54C-7

.

(1) Disconnect joint connector (CAN3) C-127 and shift lever 

connector C-27, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN3) 

C-127 (terminal 7) and shift lever connector C-27 (terminal 
2)

OK: Continuity exists (2 Ω or less)

(3) Check the wiring harness between joint connector (CAN3) 

C-127 (terminal 20) and shift lever connector C-27 (terminal 
1)

OK: Continuity exists (2 Ω or less)

Q: Is the wiring harness between joint connector (CAN3) 

C-127 and shift lever connector C-27 in good condition?
YES : Check the power supply circuit of the shift lever. Refer 

to GROUP 22C, Troubleshooting 

P.22C-370

 <shift 

lever>.

NO :  Repair the wiring harness between joint connector 

(CAN3) C-127 and shift lever connector C-27.

AC709707

Harness side: C-127

BL

Harness side: C-27

TEST 
HARNESS

TEST HARNESS

AC709707

Harness side: C-127

BM

Harness side: C-27

TEST HARNESS

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-108

DIAGNOSTIC ITEM 9: Diagnose when the scan tool cannot receive the data sent by ASC-ECU.

CAUTION

When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted 
water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.

CAN-C Communication Circuit <M/T>

ETACS-ECU

INTERFACE 
CIRCUIT

CAN DRIVE 
CIRCUIT

JOINT CONNECTOR 
(CAN2)

JOINT CONNECTOR 
(CAN3)

ASC-ECU

STEERING 
WHEEL SENSOR

AWC-ECU

ENGINE CONTROL 
MODULE