Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

DTC "C1116" may be detected when the brake pedal and the accelerator pedal are simultaneously depressed for 1 minute or more while driving the vehicle. This is not a malfunction.

INTERVIEW FROM THE CUSTOMER

Check if the brake pedal and the accelerator pedal are simultaneously depressed for 1 minute or more while driving the vehicle.

Is there such a history?

YES

GO TO STEP 2 .

NO

GO TO STEP 3 .

PERFORM SELF-DIAGNOSIS

With CONSULT
1. Erase self-diagnosis result for "ABS".
2. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
3. Set the vehicle to READY/Start the engine.
  NOTE:
  Stop the vehicle.
4. Depress the brake pedal several times.
5. Turn the ignition switch OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF.
6. Set the vehicle to READY/Start the engine.
  NOTE:
  Wait at least 10 seconds after set the vehicle to READY/start the engine.
7. Repeat step 5 to 6 two or more times.
8. Perform self-diagnosis for "ABS".
Is DTC "C1116" detected?

YES

GO TO STEP 3 .

NO

INSPECTION END

STOP LAMP FOR ILLUMINATION

Depress brake pedal and check that stop lamp turns ON.

Does stop lamp turn ON?

YES

GO TO STEP 5 .

NO

Check the stop lamp system circuit. GO TO STEP 4 .

CHECK DATA MONITOR (1)

With CONSULT
1. Erase self-diagnosis result for "ABS".
2. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
3. Set the vehicle to READY/Start the engine.
  NOTE:
  Stop the vehicle.
4. Select "ABS", "DATA MONITOR" and "STOP LAMP SW" according to this order. Check that data monitor displays "On" or "Off" when brake pedal is depressed or released. Refer to REFERENCE VALUE .
5. Select "ABS", "DATA MONITOR" and "PRESS SENSOR" according to this order. Depress the brake pedal and check if "PRESSURE SENSOR" indicates "5 bar" or less when "STOP LAMP SW" of "DATA MONITOR" turns from "Off" to "On". Refer to REFERENCE VALUE .
Is the inspection result normal?

YES

INSPECTION END

NO

GO TO STEP 5 .

CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.
3. Check the stop lamp switch harness connector for disconnection or looseness.
Is the inspection result normal?

YES

GO TO STEP 6 .

NO

Repair / replace harness or connector, and GO TO STEP 6 .

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIRCUIT

Check the ABS actuator and electric unit (control unit) power supply and ground circuit. Refer to DIAGNOSIS PROCEDURE .

Is the inspection result normal?

YES

GO TO STEP 7 .

NO

Repair / replace harness, connector, fuse, or fusible link.

CHECK STOP LAMP SWITCH CLEARANCE
1. Turn the ignition switch OFF.
2. Check the stop lamp switch clearance. Refer to INSPECTION AND ADJUSTMENT .
Is the inspection result normal?

YES

GO TO STEP 9 .

NO

Adjust stop lamp switch clearance. Refer to INSPECTION AND ADJUSTMENT . GO TO STEP 8 .

CHECK DATA MONITOR (2)

With CONSULT
1. Erase self-diagnosis result for "ABS".
2. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
3. Set the vehicle to READY/Start the engine.
  NOTE:
  Stop the vehicle.
4. Select "ABS", "DATA MONITOR" and "STOP LAMP SW" according to this order. Check that data monitor displays "On" or "Off" when brake pedal is depressed or released. Refer to REFERENCE VALUE .
5. Select "ABS", "DATA MONITOR" and "PRESS SENSOR" according to this order. Depress the brake pedal and check if "PRESSURE SENSOR" indicates "5 bar" or less when "STOP LAMP SW" of "DATA MONITOR" turns from "Off" to "On". Refer to REFERENCE VALUE .
Is the inspection result normal?

YES

INSPECTION END

NO

GO TO STEP 9 .

CHECK STOP LAMP SWITCH

Check the stop lamp switch. Refer to COMPONENT INSPECTION .

Is the inspection result normal?

YES

GO TO STEP 10 .

NO

Replace the stop lamp switch. Refer to REMOVAL AND INSTALLATION . GO TO STEP 10 .

CHECK DATA MONITOR (3)

With CONSULT
1. Erase self-diagnosis result for "ABS".
2. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
3. Set the vehicle to READY/Start the engine.
  NOTE:
  Start the vehicle.
4. Select "ABS", "DATA MONITOR" and "STOP LAMP SW" according to this order. Check that data monitor displays "On" or "Off" when brake pedal is depressed or released. Refer to REFERENCE VALUE .
5. Select "ABS", "DATA MONITOR" and "PRESS SENSOR" according to this order. Depress the brake pedal and check if "PRESSURE SENSOR" indicates "5 bar" or less when "STOP LAMP SW" of "DATA MONITOR" turns from "Off" to "On". Refer to REFERENCE VALUE .
Is the inspection result normal?

YES

INSPECTION END

NO

GO TO STEP 11 .

CHECK CONNECTOR AND TERMINAL
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.
4. Check the ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness connector.
5. Disconnect stop lamp switch harness connector.
6. Check the stop lamp switch harness connector for disconnection or looseness.
7. Check the stop lamp switch pin terminals for damage or loose connection with harness connector.
8. Disconnect resistor harness connector.
9. Check the resistor harness connector for disconnection or looseness.
10. Check the resistor pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

GO TO STEP 13 .

NO

Repair / replace harness, connector, or terminal, and GO TO STEP 12 .

CHECK DATA MONITOR (4)

With CONSULT
1. Connect ABS actuator and electric unit (control unit) harness connector.
2. Connect stop lamp switch harness connector.
3. Connect resistor harness connector.
4. Erase self-diagnosis result for "ABS".
5. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
6. Set the vehicle to READY/Start the engine.
  NOTE:
  Stop the vehicle.
7. Select "ABS", "DATA MONITOR" and "STOP LAMP SW" according to this order. Check that data monitor displays "On" or "Off" when brake pedal is depressed or released. Refer to REFERENCE VALUE .
8. Select "ABS", "DATA MONITOR" and "PRESS SENSOR" according to this order. Depress the brake pedal and check if "PRESSURE SENSOR" indicates "5 bar" or less when "STOP LAMP SW" of "DATA MONITOR" turns from "Off" to "On". Refer to REFERENCE VALUE .
Is the inspection result normal?

YES

INSPECTION END

NO

GO TO STEP 13 .

CHECK STOP LAMP SWITCH CIRCUIT (1)

Turn the ignition switch OFF.
Disconnect ABS actuator and electric unit (control unit) harness connector.

Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.

+		-	Condition	Voltage
ABS actuator and electric unit (control unit)
Connector	Terminal
E24	8	Ground	Brake pedal depressed	10 - 16 V
E24	8	Ground	Brake pedal not depressed	Approx. 0 V

Is the inspection result normal?

YES

Replace the ABS actuator and electric unit (control unit). Refer to REMOVAL AND INSTALLATION .

Repair / replace harness or connector, and GO TO STEP 14 .

CHECK STOP LAMP SWITCH CIRCUIT (2)

Turn the ignition switch OFF.
Disconnect stop lamp switch harness connector.
Disconnect resister harness connector.

Check the continuity between ABS actuator and electric unit (control unit) harness connector and stop lamp switch harness connector.

ABS actuator and electric unit (control unit)		Stop lamp switch		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E24	8	E57	2	Existed

Check the continuity between ABS actuator and electric unit (control unit) harness connector and resister harness connector.

ABS actuator and electric unit (control unit)		Resister		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E24	8	M85	1	Existed

Check the continuity between ABS actuator and electric unit (control unit) harness connector and the ground.

ABS actuator and electric unit (control unit)		-	Continuity
Connector	Terminal	-	Continuity
E24	8	Ground	Not existed

Check the continuity between resister and the ground.

Resister		-	Continuity
Connector	Terminal	-	Continuity
M85	1	Ground	Not existed
M85	2	Ground	Existed

Is the inspection result normal?

YES

Replace the ABS actuator and electric unit (control unit). Refer to REMOVAL AND INSTALLATION .

Repair / replace harness or connector, and GO TO STEP 15 .

CHECK DATA MONITOR (5)

With CONSULT
1. Connect ABS actuator and electric unit (control unit) harness connector.
2. Connect stop lamp switch harness connector.
3. Connect resister harness connector.
4. Erase self-diagnosis result for "ABS".
5. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
6. Set the vehicle to READY/Start the engine.
  NOTE:
  Stop the vehicle.
7. Select "ABS", "DATA MONITOR" and "STOP LAMP SW" according to this order. Check that data monitor displays "On" or "Off" when brake pedal is depressed or released. Refer to REFERENCE VALUE .
8. Select "ABS", "DATA MONITOR" and "PRESS SENSOR" according to this order. Depress the brake pedal and check if "PRESSURE SENSOR" indicates "5 bar" or less when "STOP LAMP SW" of "DATA MONITOR" turns from "Off" to "On". Refer to REFERENCE VALUE .
Is the inspection result normal?

YES

INSPECTION END

NO

Replace the ABS actuator and electric unit (control unit). Refer to REMOVAL AND INSTALLATION .