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Home >> Mitsubishi >> 2011 >> Lancer Evolution L4-2.0L Turbo (4B11T/C) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Component Tests and General Diagnostics >> Diagnostics Item 24 >> Part 2

Part 2




DIAGNOSTIC ITEM 24: Short to power supply or ground in both CAN_H and CAN_L lines of the CAN-B bus lines. (Continued)

STEP 12. Check the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105.

CAUTION:
A digital multimeter should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
The test wiring harness should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2)Turn the ignition switch to the ON position.





(3)Measure the voltage between joint connector (CAN1) terminal 3 and body ground.
OK: 4.7 V or less





(4)Measure the voltage between joint connector (CAN1) terminal 14 and body ground.
OK: 4.7 V or less
Q. Do all the voltages measure 4.7 V or less?

YES (vehicles with KOS) : Go to Step 13.

YES (vehicles with WCM) : Go to Step 14.

NO (vehicles with KOS and WCM) : Go to Step 22.

STEP 13. Check the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105.

CAUTION:
A digital multimeter should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
The test wiring harness should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2)Turn the ignition switch to the ON position.





(3)Measure the voltage between joint connector (CAN1) terminal 9 and body ground.
OK: 4.7 V or less





(4)Measure the voltage between joint connector (CAN1) terminal 22 and body ground.
OK: 4.7 V or less
Q. Do all the voltages measure 4.7 V or less?

YES Go to Step 15.

NO Go to Step 23.

STEP 14. Check the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105.

CAUTION:
A digital multimeter should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
The test wiring harness should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2)Turn the ignition switch to the ON position.





(3)Measure the voltage between joint connector (CAN1) terminal 7 and body ground.
OK: 4.7 V or less





(4)Measure the voltage between joint connector (CAN1) terminal 20 and body ground.
OK: 4.7 V or less
Q. Do all the voltages measure 4.7 V or less?

YES Go to Step 15.

NO Go to Step 24.

STEP 15. Check the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105.

CAUTION:
A digital multimeter should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
The test wiring harness should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2)Turn the ignition switch to the ON position.





(3)Measure the voltage between joint connector (CAN1) terminal 8 and body ground.
OK: 4.7 V or less





(4)Measure the voltage between joint connector (CAN1) terminal 21 and body ground.
OK: 4.7 V or less
Q. Do all the voltages measure 4.7 V or less?

YES Go to Step 16.

NO Go to Step 25.

STEP 16. Check the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105.

CAUTION:
A digital multimeter should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
The test wiring harness should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2)Turn the ignition switch to the ON position.





(3)Measure the voltage between joint connector (CAN1) terminal 11 and body ground.
OK: 4.7 V or less





(4)Measure the voltage between joint connector (CAN1) terminal 24 and body ground.
OK: 4.7 V or less
Q. Do all the voltages measure 4.7 V or less?

YES Go to Step 17.

NO : Go to Step 26.

STEP 17. Check the wiring harness between joint connector (CAN1) C-105 and A/C-ECU connector C-22 [vehicles with A/C] or heater control unit connector C-53 [vehicles without A/C] for a short to power supply. Measure the voltage at joint connector (CAN1) C-105.

CAUTION:
A digital multimeter should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
The test wiring harness should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2)Turn the ignition switch to the ON position.





(3)Measure the voltage between joint connector (CAN1) terminal 1 and body ground.
OK: 4.7 V or less





(4)Measure the voltage between joint connector (CAN1) terminal 12 and body ground.
OK: 4.7 V or less
Q. Do all the voltages measure 4.7 V or less?

YES (vehicles without MMCS) : Go to Step 18.

YES (vehicles with MMCS) : Go to Step 19.

NO : Go to Step 27.

STEP 18. Check the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105.

CAUTION:
A digital multimeter should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
The test wiring harness should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2)Turn the ignition switch to the ON position.





(3)Measure the voltage between joint connector (CAN1) terminal 5 and body ground.
OK: 4.7 V or less





(4)Measure the voltage between joint connector (CAN1) terminal 16 and body ground.
OK: 4.7 V or less
Q. Do all the voltages measure 4.7 V or less?

YES (vehicles without satellite radio) : Go to Step 21.

YES (vehicles with satellite radio) : Go to Step 20.

NO : Go to Step 28.

STEP 19. Check the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105.

CAUTION:
A digital multimeter should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
The test wiring harness should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2)Turn the ignition switch to the ON position.





(3)Measure the voltage between joint connector (CAN1) terminal 5 and body ground.
OK: 4.7 V or less





(4)Measure the voltage between joint connector (CAN1) terminal 16 and body ground.
OK: 4.7 V or less
Q. Do all the voltages measure 4.7 V or less?

YES (vehicles without satellite radio) : Go to Step 21.

YES (vehicles with satellite radio) : Go to Step 20.

NO : Go to Step 29.

STEP 20. Check the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105.

CAUTION:
A digital multimeter should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
The test wiring harness should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2)Turn the ignition switch to the ON position.





(3)Measure the voltage between joint connector (CAN1) terminal 2 and body ground.
OK: 4.7 V or less





(4)Measure the voltage between joint connector (CAN1) terminal 13 and body ground.
OK: 4.7 V or less
Q. Do all the voltages measure 4.7 V or less?

YES Go to Step 21.

NO Go to Step 30.

STEP 21. Check the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105.

CAUTION:
A digital multimeter should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
The test wiring harness should be used. For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1) and ETACS-ECU connector C-301, and measure the voltage at the wiring harness side of joint connector (CAN1).

(2)Turn the ignition switch to the ON position.





(3)Measure the voltage between joint connector (CAN1) terminal 6 and body ground.
OK: 1 V or less





(4)Measure the voltage between joint connector (CAN1) terminal 19 and body ground.
OK: 1 V or less
Q. Do all the voltages measure 1 V or less?

YES Go to Step 31.

NO Repair the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301.

STEP 22. Using scan tool MB991958, diagnose the CAN bus line. (checking the combination meter for internal failure)

CAUTION:
Strictly observe the specified wiring harness repair procedure.
For details refer to Precautions When CAN Bus Line(s) are Repaired.

CAUTION:
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)Disconnect combination meter connector C-04.





(2)Connect scan tool MB991958 to the data link connector.
(3)Turn the ignition switch to the "ON" position.









(4)Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.
OK: The display of the scan tool MB991958 is as shown in the figure.
Q. Does scan tool MB991958 screen correspond to the illustration?

YES Repair the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04.

NO Check combination meter connector C-04, and repair if necessary. If the combination meter connector is in good condition, replace the combination meter.
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