Brake Control System: Overview Nissan Maxima A34

System Description

Refer to CAN COMMUNICATION .

Description

If an error is detected in the system, the ABS warning lamp will turn on. In this case, perform self-diagnosis as follows

Operation Procedure

1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to the data link connector. CAUTION: If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be detected in self-diagnosis depending on control unit which carries out CAN communication.
3. Turn ignition switch ON.
4. Start engine and drive at approximately 30 km/h (19 MPH) for approximately 1 minute.
5. After stopping the vehicle, with the engine running, touch "START (NISSAN BASED VHCL)", "ABS", "SELF-DIAG RESULTS" in order on the CONSULT-II screen. CAUTION: If "START (NISSAN BASED VHCL)" is touched immediately after starting the engine or turning on the ignition switch, "ABS" might not be displayed in the System Selection screen. In this case, repeat the operation from step 1 .
6. The self-diagnostic results are displayed. (If necessary, the self-diagnostic results can be printed out by touching "COPY".) When "NO FAILURE" is displayed, check the ABS warning lamp.
7. Conduct the appropriate inspection from the display item list, and repair or replace the malfunctioning component.
8. Start engine and drive at approximately 30 km/h (19 MPH) for approximately 1 minute. CAUTION: When a wheel sensor "short-circuit" is detected, if the vehicle is not driven at 30 km/h (19 MPH) for at least 1 minute, the ABS warning lamp will not turn off even if the malfunction is repaired.
9. Turn ignition switch OFF to prepare for erasing the memory.
10. Start the engine and touch "START (NISSAN BASED VHCL)", "ABS", "SELF-DIAG RESULTS", "ERASE MEMORY" in order on the CONSULT-II screen to erase the error memory. If "ABS" is not indicated, go to «CONSULT-II DATA LINK CONNECTOR (DLC) CIRCUIT»(ref-233642-S33893762202006052600000) . CAUTION: If the error memory is not erased, re-conduct the operation from step 5 .
11. For the final inspection, drive at approximately 30 km/h (19 MPH) for approximately 1 minute and confirm that the ABS warning lamp is off.

1. After turning OFF the ignition switch, connect CONSULT-II and CONSULT-II CONVERTER to the data link connector. CAUTION: If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be detected in self-diagnosis depending on control unit which carries out CAN communication.
2. Touch "START (NISSAN BASED VHCL)", "ABS", "DATA MONITOR" in order on the CONSULT-II screen. If "ABS" is not indicated, go to «CONSULT-II DATA LINK CONNECTOR (DLC) CIRCUIT»(ref-233642-S33893762202006052600000) . CAUTION: When "START (NISSAN BASED VHCL)" is touched immediately after starting the engine or turning on the ignition switch, "ABS" might not be displayed in the system selection screen. In this case, repeat the operation from step 2 .
3. Return to the Monitor Item Selection screen, and touch "C/U INPUT ITEM", "MAIN ITEM" or "ITEM MENU SELECTION". Refer to the following information.
4. When "START" is touched, the data monitor screen is displayed.

Scheme 1

Scheme 2

Pedal Vibration or ABS Operation Noise

Note. During ABS activation, pedal vibration may be felt and a noise may be heard. This is normal and does not indicate a malfunction.

1. CHECK SYMPTOM Apply brake. Start engine. Does the symptom occur only when engine is started? YES: Carry out self-diagnosis. Refer to «SELF-DIAGNOSIS»(ref-233669-S08688104732006052600000) . NO: GO TO 2 .
2. RECHECK SYMPTOM Does the symptom occur only when electrical equipment switches (such as headlamp) are turned on? YES: Check for radio, antenna or related wiring that is routed too close to the ABS actuator and electric unit (control unit) and reroute as necessary. NO: Go to «ABS WORKS FREQUENTLY»(ref-233669-S21725177922006052600000) .

Scheme 3

Scheme 4

1. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) FUSES Check 30A fusible link g and 30A fusible link h for ABS actuator and electric unit (control unit). For fusible link layout, refer to «POWER SUPPLY ROUTING CIRCUIT»(ref-233661-S18989168572006052600000) . OK or NG OK: GO TO 2 . NG: If fusible link is blown, be sure to eliminate cause of problem before replacing.
2. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY CIRCUITS Disconnect ABS actuator and electric unit (control unit) connector. Check voltage between ABS actuator and electric unit (control unit) connector terminal 1 (B/Y) and ground and terminal 15 (Y) and ground. Does battery voltage exist? YES: GO TO 3 . NO: Repair harness or connectors between fusible link and ABS actuator and electric unit (control unit).
3. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT Check continuity between ABS actuator and electric unit (control unit) connector terminal 16 (B) and ground and terminal 30 (B) and ground. Does continuity exist? YES: Replace ABS actuator and electric unit (control unit). Refer to «REMOVAL AND INSTALLATION»(ref-233669-S23005385922006052600000) . NO: Repair harness or connectors between ABS actuator and electric unit (control unit) and ground.

Refer to CAN COMMUNICATION .

If an error is detected in the system, the ABS warning lamp will turn on. In this case, perform self-diagnosis as follows

1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to the data link connector. CAUTION: If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be detected in self-diagnosis depending on control unit which carries out CAN communication.
3. Turn ignition switch ON.
4. Start engine and drive at approximately 30 km/h (19 MPH) for approximately 1 minute.
5. After stopping the vehicle, with the engine running, touch "START (NISSAN BASED VHCL)", "ABS", "SELF-DIAG RESULTS" in order on the CONSULT-II screen. CAUTION: If "START (NISSAN BASED VHCL)" is touched immediately after starting the engine or turning on the ignition switch, "ABS" might not be displayed in the System Selection screen. In this case, repeat the operation from step 1 .
6. The self-diagnostic results are displayed. (If necessary, the self-diagnostic results can be printed out by touching "COPY".) When "NO FAILURE" is displayed, check the ABS warning lamp and SLIP indicator lamp.
7. Conduct the appropriate inspection from the display item list, and repair or replace the malfunctioning component.
8. Start engine and drive at approximately 30 km/h (19 MPH) for approximately 1 minute. CAUTION: When a wheel sensor "short-circuit" is detected, if the vehicle is not driven at 30 km/h (19 MPH) for at least 1 minute, the ABS warning lamp will not turn off even if the malfunction is repaired.
9. Turn ignition switch OFF to prepare for erasing the memory.
10. Start the engine and touch "START (NISSAN BASED VHCL)", "ABS", "SELF-DIAG RESULTS", "ERASE MEMORY" in order on the CONSULT-II screen to erase the error memory. If "ABS" is not indicated, go to «CONSULT-II DATA LINK CONNECTOR (DLC) CIRCUIT»(ref-233642-S33893762202006052600000) . CAUTION: If the error memory is not erased, re-conduct the operation from step 5 .
11. For the final inspection, drive at approximately 30 km/h (19 MPH) for approximately 1 minute and confirm that the ABS warning lamp and SLIP indicator lamp are off.

Scheme 5

Scheme 6

Note 1: If wheel sensor 2 for each wheel is indicated, check ABS actuator and electric unit (control unit) power supply voltage in addition to wheel sensor circuit check.

Note 2: If multiple malfunctions are detected including CAN communication line [U1000], perform diagnosis for CAN communication line first.

Note 3: "ACTUATOR RLY" on the CONSULT-II self-diagnosis results indicates the malfunction of the actuator motor relay or circuit.

1. After turning OFF the ignition switch, connect CONSULT-II and CONSULT-II CONVERTER to the data link connector. CAUTION: If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be detected in self-diagnosis depending on control unit which carries out CAN communication.
2. Touch "START (NISSAN BASED VHCL)", "ABS", "DATA MONITOR" in order on the CONSULT-II screen. If "ABS" is not indicated, go to «CONSULT-II DATA LINK CONNECTOR (DLC) CIRCUIT»(ref-233642-S33893762202006052600000) . CAUTION: When "START (NISSAN BASED VHCL)" is touched immediately after starting the engine or turning on the ignition switch, "ABS" might not be displayed in the system selection screen. In this case, repeat the operation from step 2 .
3. Return to the Monitor Item Selection screen, and touch "C/U INPUT ITEM", "MAIN ITEM" or "ITEM MENU SELECTION". Refer to the following information.
4. When "START" is touched, the data monitor screen is displayed.

Scheme 7

Scheme 8

Scheme 9

Note. During ABS activation, pedal vibration may be felt and a noise may be heard. This is normal and does not indicate a malfunction.

1. CHECK SYMPTOM Apply brake. Start engine. Does the symptom occur only when engine is started? YES: Carry out self-diagnosis. Refer to «SELF-DIAGNOSIS»(ref-233669-S08017209832006052600000) . NO: GO TO 2 .
2. RECHECK SYMPTOM Does the symptom occur only when electrical equipment switches (such as headlamp) are turned on? YES: Check for radio, antenna or related wiring that is routed too close to the ABS actuator and electric unit (control unit) and reroute as necessary. NO: Go to «ABS WORKS FREQUENTLY»(ref-233669-S07127831212006052600000) .

Scheme 10

Scheme 11

1. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) FUSES Check 30A fusible link g and 30A fusible link h for ABS actuator and electric unit (control unit). For fusible link layout, refer to «POWER SUPPLY ROUTING CIRCUIT»(ref-233661-S18989168572006052600000) . OK or NG OK: GO TO 2 . NG: If fusible link is blown, be sure to eliminate cause of problem before replacing.
2. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY CIRCUITS Disconnect ABS actuator and electric unit (control unit) connector. Check voltage between ABS actuator and electric unit (control unit) connector terminal 1 (B/Y) and ground and terminal 15 (Y) and ground. Does battery voltage exist? YES: GO TO 3 . NO: Repair harness or connectors between fusible link and ABS actuator and electric unit (control unit).
3. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT Check continuity between ABS actuator and electric unit (control unit) connector terminal 16 (B) and ground and terminal 30 (B) and ground. Does continuity exist? YES: Replace ABS actuator and electric unit (control unit). Refer to «REMOVAL AND INSTALLATION»(ref-233669-S15586165312006052600000) . NO: Repair harness or connectors between ABS actuator and electric unit (control unit) and ground.

Refer to CAN COMMUNICATION .

Note. During ABS activation, pedal vibration may be felt and a noise may be heard. This is normal and does not indicate a malfunction.

1. CHECK SYMPTOM Apply brake. Start engine. Does the symptom occur only when engine is started? YES: Carry out self-diagnosis. Refer to «SELF-DIAGNOSIS»(ref-233669-S17606601712006092900000) . NO: GO TO 2 .
2. RECHECK SYMPTOM Does the symptom occur only when electrical equipment switches (such as headlamp) are turned on? YES: Check for radio, antenna or related wiring that is routed too close to the ABS actuator and electric unit (control unit) and reroute as necessary. NO: Go to «ABS WORKS FREQUENTLY»(ref-233669-S36218998042006052600000) .

Scheme 12

Scheme 13

1. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) FUSES Check 40A fusible link i and 50A fusible link j for ABS actuator and electric unit (control unit). For fusible link layout, refer to «POWER SUPPLY ROUTING CIRCUIT»(ref-233661-S18989168572006052600000) . OK or NG OK: GO TO 2 . NG: If fusible link is blown, be sure to eliminate cause of problem before replacing.
2. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY CIRCUITS Disconnect ABS actuator and electric unit (control unit) connector. Check voltage between ABS actuator connector terminal 1 (R/B) and ground and terminal 16 (G/R) and ground. Does battery voltage exist? YES: GO TO 3 . NO: Repair harness or connectors between fusible link and ABS actuator and electric unit (control unit).
3. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT Check continuity between ABS actuator and electric unit (control unit) connector E125 terminal 31 (B) and ground and terminal 46 (B) and ground. Does continuity exist? YES: Replace ABS actuator and electric unit (control unit). Refer to «REMOVAL AND INSTALLATION»(ref-233669-S13612598582006052600000) . NO: Repair harness or connectors between ABS actuator and electric unit (control unit) and ground.