ABS WARNING LIGHT CIRCUIT

Refer to INSPECTION PROCEDURE 3: WHEN THE IGNITION KEY IS TURNED TO THE "ON" POSITION (ENGINE STOPPED), THE ABS WARNING LIGHT DOES NOT ILLUMINATE. .

Refer to CIRCUIT OPERATION .

The cause is probably the ABS-ECU malfunction.

The most likely causes for this case are

Damaged wiring harness or connector
Malfunction of the brake modulator hydraulic unit (integrated with ABS-ECU)

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Scheme 194: DIAGNOSIS

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STEP 1. Check the following connectors. Combination meter connector C-01 Intermediate connector C-122 ABS-ECU connector B-118 Check the connectors for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are the connectors and terminals in good condition? YES: Go to Step 2. NO: Repair it and then go to Step 4 .
STEP 2. Check the following harness wire. The wire between combination meter connector C-01 (terminal 13) and ABS-ECU connector B-118 (terminal 27) Q: Is the harness wire damaged? YES: Repair or replace it and then go to Step 4 . NO: Go to Step 3.
STEP 3. Check the ABS warning light circuit at ABS-ECU connector B-118. Disconnect ABS-ECU connector B-118 and check at the harness side connector. Turn the ignition switch to the "ON" position. Ground terminal 27 and check the ABS warning light. Q: Does the ABS warning light go off? YES: Replace the brake modulator hydraulic unit (integrated with ABS-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/ix-2005-2007/remont/anti-locktraction-control/#anti-lock-braking-system-abs-lancer-evolution) ). Then go to Step 4. NO: Replace the combination meter (Refer to «COMBINATION METER ASSEMBLY AND VEHICLE SPEED SENSOR»(/mitsubishi/lancer-evolution/ix-2005-2007/remont/antenna-systems/#chassis-electrical-lancer-evolution) ). Then go to Step 4.
STEP 4. Retest the system. Q: Does the ABS warning light turn off in 3 seconds after start-up? YES: The procedure is complete. NO: Return to Step 1 .

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Scheme 197: INSPECTION PROCEDURE 5: In the Inspection with the Scan Tool Service Data, the Parking Brake Switch

The ABS-ECU monitors the parking brake switch to optimize the ABS control.

The cause may be an open or a short circuit between the parking brake switch and the ABS-ECU.

The most likely causes for this case are

Damaged wiring harness or connector
Malfunction of the parking brake switch
Malfunction of the brake modulator hydraulic unit (integrated with ABS-ECU)

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 MB991911: M.U.T.-III Main Harness B

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STEP 1. Using scan tool MB991958, check data list. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOOK" (OFF) position before connecting or disconnecting scan MB991958. Connect scan tool MB991958 as shown in the illustration. Start the engine. Set scan tool MB991958 to data reading mode for following item. Item 29: Parking brake switch Confirm the indicated ON/OFF state as follows: DISPLAY CHART CHECKING REQUIREMENT DISPLAY Pull the parking brake lever ON Release the parking brake lever OFF Q: Is the parking brake switch input normal? YES: This malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(/mitsubishi/lancer-evolution/ix-2005-2007/remont/hoistjack/#general-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Go to Step 2.
STEP 2. Check the parking brake switch circuit at ABS-ECU connector B-118. Disconnect ABS-ECU connector B-118 and measure at the harness side. Check for continuity between terminal 1 and ground with pulling or releasing the parking brake lever. If the parking brake lever is pulled, there should be no continuity, and if the parking brake lever is released, there should be continuity (less than 2 ohms). Q: Does continuity exist when the parking brake lever is released, and dose continuity not exist when the parking brake lever is pulled? YES: Go to Step 3. NO: Go to Step 4 .
STEP 3. Check the following connector. ABS-ECU connector B-118 Check the connector for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are the connector and terminals in good condition? YES: Replace the brake modulator hydraulic unit (integrated with ABS-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/ix-2005-2007/remont/anti-locktraction-control/#anti-lock-braking-system-abs-lancer-evolution) ). Then go to Step 6 . NO: Go to Step 6 .
STEP 4. Check the following connectors. ABS-ECU connector B-118 Intermediate connector C-124 Joint connector C-23 Parking brake switch connector D-28 Check the connectors for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are the connectors and terminals in good condition? YES: Go to Step 5. NO: Repair it and then go to Step 6 .
STEP 5. Check the following harness wire. The wire between parking brake switch connector D-28 (terminal 1) and ABS-ECU connector B-118 (terminal 1) Q: Is the harness wire damaged? YES: Repair or replace it and then go to Step 6. NO: Replace the parking brake switch (Refer to «PARKING BRAKE LEVER»(/mitsubishi/lancer-evolution/ix-2005-2007/remont/parking-brake-system/#parking-brakes-lancer-evolution) ). Then go to Step 6.
STEP 6. Recheck for diagnostic trouble code. Q: Does the parking brake switch turn ON/OFF normally in the inspection by scan tool service data? YES: The procedure is complete. NO: Return to Step 1 .

Scheme 202

Scheme 202: INSPECTION PROCEDURE 6: The Neutral Position Learning of the Steering Angular Velocity Sensor is not

The ABS system detects the neutral position learning of the steering angular velocity sensor by the signal from the stoplight.

The diagnosis is difficult because it depends on driving condition and road surface, if the diagnostic trouble code has not been set, carry out the following checks (refer to TROUBLESHOOTING HINTS ).

The most likely causes for this case are

Damaged wiring harness or connector
Malfunction of the stoplight switch system
Tires are not all the same diameter
Malfunction of suspension
Malfunction of the steering angular velocity sensor installation
Malfunction of the brake modulator hydraulic unit (integrated with ABS-ECU)

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 MB991911: M.U.T.-III Main Harness B

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STEP 1. Check the front tires. Q: Are the tire diameters different? YES: Replace the appropriate tire and then go to Step 13 . NO: Go to Step 2.
STEP 2. Check the front suspension. Q: Is the front suspension abnormal? YES: Repair the front suspension and then go to Step 13 . NO: Go to Step 3.
STEP 3. Using scan tool MB991958, check data list. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOOK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958 as shown in the illustration. Start the engine. Set scan tool MB991958 to data reading mode for following item. Item 37: Steering angular sensor neutral position learning Confirm the indicated ON/OFF state as follows: DISPLAY CHART CHECKING REQUIREMENT DISPLAY After driving straight at vehicle speed over than 10 km/h (6.3 mph) ON Before driving with ignition switch ON OFF Q: Is the steering angular velocity sensor straight ahead position learning input normal? YES: Go to Step 5 . NO: Confirm the steering angular velocity sensor is correctly installed. Then go to Step 4.
STEP 4. Check for steering angular velocity sensor output voltage. Connect steering angular velocity sensor connector C-230. Turn the ignition switch to the "ON" position. Measure the voltage, by backprobing, between terminal 1 and ground, terminal 4 and ground, and terminal 5 and ground. The voltage should measure as indicated in the figure. Q: Is the steering angular velocity sensor output voltage normal? YES: Go to Step 13 . NO: Replace the steering angular velocity sensor (Refer to «STEERING ANGULAR VELOCITY SENSOR»(/mitsubishi/lancer-evolution/ix-2005-2007/remont/anti-locktraction-control/#anti-lock-braking-system-abs-lancer-evolution) .) and then go to Step 13 .
STEP 5. Check the stoplight. Q: Does the stoplight turn on and off normally? YES: Go to Step 9 . NO: Go to Step 6.
STEP 6. Check the stoplight switch installation condition. Q: Is the stoplight switch installed correctly? YES: Check the stoplight switch (Refer to «BRAKE PEDAL»(/mitsubishi/lancer-evolution/ix-2005-2007/remont/mechanical-hydraulic/#basic-brake-system-lancer-evolution__a-brake-pedal-assembly) ). Then go to Step 7. NO: Repair the installation of the stoplight switch (Refer to «BRAKE PEDAL CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/ix-2005-2007/remont/mechanical-hydraulic/#basic-brake-system-lancer-evolution) ). Then go to Step 13 .
STEP 7. Check the following connectors. Intermediate connectors C-129 Stoplight switch connector C-102 Check the connectors for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are the connectors and terminals in good condition? YES: Go to Step 8. NO: Repair it and then go to Step 13 .
STEP 8. Check the following harness wires. The wire between relay box in engine compartment (fuse No. 10) and stoplight switch connector C-102 (terminal 2) The wire between stoplight switch connector C-102 (terminal 1) and stoplights Q: Is any harness wire damaged? YES: Repair or replace it and then go to Step 13 . NO: Go to Step 9.
STEP 9. Check the stoplight switch circuit. Measure the voltage at ABS-ECU connector B-118. Disconnect ABS-ECU connector B-118 and measure at the harness side. Depress the brake pedal to turn on the stoplight switch. Measure the voltage between terminal 19 and ground. It should measure battery voltage (approximately 12 volts). Q: Is battery positive voltage (approximately 12 volts) present? YES: Go to Step 12 . NO: Go to Step 10.
STEP 10. Check the following connectors. ABS-ECU connector B-118 Joint connector C-105 Intermediate connector C-124 Stoplight switch connector C-102 Check the connectors for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are the connectors and terminals in good condition? YES: Go to Step 11. NO: Repair it and then go to Step 13 .
STEP 11. Check the following harness wire. The wire between stoplight switch connector C-102 (terminal 1) and ABS-ECU connector B-118 (terminal 19) Q: Is the harness wire damaged? YES: Repair or replace it and then go to Step 13 . NO: Go to Step 13 .
STEP 12. Check the following connector. Inspecting Check the connector for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are the connector and terminals in good condition? YES: Replace the brake modulator hydraulic unit (integrated with ABS-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/ix-2005-2007/remont/anti-locktraction-control/#anti-lock-braking-system-abs-lancer-evolution) ). Then go to Step 13. NO: Repair it and then go to Step 13.
STEP 13. Retest the system. Q: Is the neutral position learning of the steering angular velocity sensor detected by the ABS system? YES: The procedure is complete. NO: Return to Step 1 .

The cause depends on driving and road surface conditions, so diagnosis may be difficult. However, if no diagnostic trouble code is set, carry out the following inspection.

ABS WARNING LIGHT CIRCUIT Mitsubishi Lancer Evolution IX