FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Mitsubishi >> 2012 >> Lancer Evolution L4-2.0L Turbo (4B11T/C) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B1000 >> Vehicles Without A/C

Vehicles Without A/C




DTC B1000: Control panel communication error [Vehicles without A/C]














DTC SET CONDITION

DTC B1000 will be set when the communication between heater control module and heater control panel cannot be performed.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

- The heater control module, the heater control panel, or connector(s) or wiring between the two may be defective.

Past trouble

- If DTC B1000 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the heater control module and the heater control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

TROUBLESHOOTING HINT

- Malfunction of connector.
- Malfunction of the harness.
- Malfunction of the heater control panel.
- Malfunction of the heater control module.

DIAGNOSIS

Required Special Tool:

- 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. Using scan tool MB991958, diagnose the CAN bus line.

Use scan tool MB991958 to diagnose the CAN bus lines.





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

Q. Is the check result satisfactory?

YES Go to Step 2.

NO Repair the CAN bus lines. Repair the CAN bus lines CAN Bus Diagnostics Chart).

STEP 2. Recheck for diagnostic trouble code.

Recheck if the DTC is set.

(1)Erase the DTC.

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

(3)Check if the DTC is set.

Q. Is the DTC set?

YES Go to Step 3.
NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.
STEP 3. Check heater control panel connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is heater control panel connector C-138 in good condition?

YES Go to Step 4.
NO Repair or replace the connector. Harness Connector Inspection.
STEP 4. Measure the voltage at heater control panel connector C-138.

(1)Disconnect heater control panel connector C-138, and measure the voltage at the harness side.

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





(3)Measure the voltage between terminal 6 and ground.

- The measured value should be approximately 12 volts (battery positive voltage).

Q. Is the measured voltage approximately 12 volts?

YES Go to Step 6.

NO Go to Step 5.

STEP 5. Check the wiring harness between heater control panel connector C-138 (terminal 6) and ETACS-ECU connector C-317 (terminal 5).

- Check the heater control panel power supply line for open circuit.

NOTE:
Also check joint connector C-101 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-101 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between heater control panel connector C-138 (terminal 6) and ETACS-ECU connector C-317 (terminal 5) in good condition?

YES It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.
NO Repair the wiring harness.
STEP 6. Measure the resistance at heater control panel connector C-138.





(1)Disconnect heater control panel connector C-138, and measure the resistance at the wiring harness side.
(2)Measure the resistance value between terminal 7 and ground.

- The measured value should be 2 ohms or less.

Q. Does the measured resistance value correspond with this range?

YES Go to Step 8.

NO Go to Step 7.

STEP 7. Check the wiring harness between heater control panel connector C-138 (terminal 7) and ground.

- Check the heater control panel ground line for open circuit.

Q. Is the wiring harness between heater control panel connector C-138 (terminal 7) and ground in good condition?

YES It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.
NO Repair the wiring harness.
STEP 8. Check heater control module connector C-53 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is heater control module connector C-53 in good condition?

YES Go to Step 9.
NO Repair or replace the connector. Harness Connector Inspection.
STEP 9. Check the wiring harness between heater control module connector C-53 (terminal 9) and heater control panel connector C-138 (terminal 9).

- Check the heater control panel signal line for open and short circuit.

Q. Is the wiring harness between heater control module connector C-53 (terminal 9) and heater control panel connector C-138 (terminal 9) in good condition?

YES Go to Step 10.
NO Repair the wiring harness.
STEP 10. Recheck for diagnostic trouble code.

Recheck if the DTC is set.

(1)Erase the DTC.

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

(3)Check if the DTC is set.

Q. Is the DTC set?

YES Replace the heater control panel. Then go to Step 11.
NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.
STEP 11. Recheck for diagnostic trouble code.

Recheck if the DTC is set.

(1)Erase the DTC.

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

(3)Check if the DTC is set.

Q. Is the DTC set?

YES Replace the heater control module.
NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.
pro multis Credits:Operation CHARM About Operation CHARM