2003 NISSAN X-TRAIL ECU

TROUBLE DIAGNOSIS
BRC-83
[ESP/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

BATTERY VOLT
(V )×××Voltage supplied to ESP/TCS/
ABS control unit is displayed.
MOTOR RELAY
(ON/OFF )–××Motor relay signal (ON/OFF) sta-
tus is displayed.
ACTUATOR RLY
(ON/OFF )–××Actuator relay signal (ON/OFF)
status is displayed.
STOP LAMP SW
(ON/OFF)×××Stop lamp switch (ON/OFF) status
is displayed.
PARK BRAKE SW
(ON/OFF)×–×Parking brake switch (ON/OFF)
status is displayed.
OFF SW
(ON/OFF)×××ESP OFF switch (ON/OFF) sta-
tus is displayed.
ABS WARN LAMP
(ON/OFF)–××ABS warning lamp (ON/OFF) sta-
tus is displayed.
OFF LAMP
(ON/OFF)–××ESP OFF indicator lamp (ON/
OFF) status is displayed.
SLIP LAMP
(ON/OFF)–××SLIP indicator lamp (ON/OFF)
status is displayed.
FR LH IN SOL
(ON/OFF)–××Front LH wheel inlet solenoid
valve (ON/OFF) status is dis-
played.
FR LH OUT SOL
(ON/OFF)–××Front LH wheel outlet solenoid
valve (ON/OFF) status is dis-
played.
RR RH IN SOL
(ON/OFF)–××Rear RH wheel inlet solenoid
valve (ON/OFF) status is dis-
played.
RR RH OUT SOL
(ON/OFF)–××Rear RH wheel outlet solenoid
valve (ON/OFF) status is dis-
played.
FR RH IN SOL
(ON/OFF)–××Front RH wheel inlet solenoid
valve (ON/OFF) status is dis-
played.
FR RH OUT SOL
(ON/OFF)–××Front RH wheel outlet solenoid
valve (ON/OFF) status is dis-
played.
RR LH IN SOL
(ON/OFF)–××Rear LH wheel inlet solenoid
valve (ON/OFF) status is dis-
played.
RR LH OUT SOL
(ON/OFF)–××Rear LH wheel outlet solenoid
valve (ON/OFF) status is dis-
played.
M/R OUTPUT
(ON/OFF)––×Motor relay activation signal (ON/
OFF) status is displayed.
FLUID LEV SW
(ON/OFF)×–×Brake fluid level warning switch
(ON/OFF) status is displayed.
SNOW MODE SW
(ON/OFF)––דOFF” is displayed.
BST OPER SIG
(ON/OFF)––דOFF” is displayed.
M MODE SIG
(ON/OFF)––דOFF” is displayed. Data Monitor Item (Unit)Data Monitor item selection
Remarks
ECU INPUT
SIGNALSMAIN
SIGNALSSELECTION
FROM MENU

BRC-84
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS

×: Applicable
–: Not applicable
ACTIVE TEST
CAUTION:

Do not perform active test while driving.

Make sure to completely bleed air from the brake system.

Active test cannot be performed when EBD, ABS, TCS or ESP operation is malfunction.

ABS and brake warning lamps turn on during the active test.
Operation Procedure
1. Connect CONSULT-II and CONVERTER to data link connector and start engine.
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 carry out CAN communication.
2. Touch “START (NISSAN BASED VHCL) ” on the display screen.
3. Touch “ABS”.
If “ABS” is not indicated, go to GI-35, "
CONSULT-II Data Link Connector (DLC) Circuit" .
4. Touch “ACTIVE TEST”.
5. The test item selection screen is displayed.
6. Touch necessary test item.
7. With the “MAIN SIGNALS” display shown in reverse, touch “START”.
8. The “ACTIVE TEST” screen will be displayed, so perform the following test.
NOTE:

When the active test is performed while depressing pedal, the pedal depression amount will change,
but this is normal.

Approximately 10 seconds after the operation is begun, “TEST STOP” will be displayed.

To perform a retest after “TEST STOP” is displayed, touch “BACK” and perform the test from the step 6.
Test Item
Solenoid valve
OD OFF SW
(ON/OFF)––דOFF” is displayed.
EBD SIGNAL
(ON/OFF)––×EBD operation (ON/OFF) status is
displayed.
ABS SIGNAL
(ON/OFF)––×ABS operation (ON/OFF) status is
displayed.
TCS SIGNAL
(ON/OFF)––×TCS operation (ON/OFF) status is
displayed.
ESP SIGNAL
(ON/OFF)––×ESP operation (ON/OFF) status is
displayed. Data Monitor Item (Unit)Data Monitor item selection
Remarks
ECU INPUT
SIGNALSMAIN
SIGNALSSELECTION
FROM MENU
SFIA1172E

BRC-96
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS

3. YAW RATE SENSOR/SIDE G SENSOR CIRCUIT CHECK
Check that “YAW RATE SEN” and “SIDE G-SENSOR” are in normal operation in “DATA MONITOR”.
Is inspection result OK?
YES >> Perform ESP/TCS/ABS control unit self-diagnosis again.
NO >> The yaw rate/side G sensor malfunction. After replacing the sensor, perform the self-diagnosis of
ESP/TCS/ABS control unit again.
Inspection 7 Solenoid Valve, ESP Switch-over Solenoid Valve and CircuitEFS001AI
Inspection procedure
1. SELF-DIAGNOSIS RESULT CHECK 1
Check the self-diagnosis results.
Are any self-diagnosis result items above indicated?
YES >> GO TO 2.
NO >> INSPECTION END.
2. SELF-DIAGNOSIS RESULT CHECK 2
1. Disconnect ESP/TCS/ABS control unit connector and solenoid valve connectors. Securely connect them
again.
2. Perform the self-diagnosis again.
Are any self-diagnosis result items indicated again?
YES >> GO TO 3.
NO >> Repair or replace the poorly connected connector.Vehicle statusYAW R AT E S E N
(DATA MONITOR) SIDE G-SENSOR
(DATA MONITOR)
While the vehicle is stopped
– 4 to + 4 °/s
–1.1 to + 1.1 m/s
2
Right turn Negative value Negative value
Left turn Positive value Positive value
Self-diagnosis results
FR LH IN ABS SOL
FR LH OUT ABS SOL
RR RH IN ABS SOL
RR RH OUT ABS SOL
FR RH IN ABS SOL
FR RH OUT ABS SOL
RR LH IN ABS SOL
RR LH OUT ABS SOL
USV LINE [FL-RR]
USV LINE [FR-RL]
HSV LINE [FL-RR]
HSV LINE [FR-RL]

BRC-100
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS

2. SELF-DIAGNOSIS RESULT CHECK 2
1. Disconnect connectors for ESP/TCS/ABS control unit and the actuator. Securely connect them again.
2. Perform the self-diagnosis again.
Are any self-diagnosis items indicated again?
YES >> GO TO 3.
NO >> Repair or replace the poorly connected connector.
3. ACTUATOR MOTOR, MOTOR RELAY POWER SUPPLY CIRCUIT INSPECTION
1. Disconnect relay box harness connectors.
2. Check the voltage between the harness connector E55 and
body ground.
Is inspection result OK?
YES >> GO TO 4.
NO >>

Check the fuse 50A.

Check for the continuity between battery and relay box terminal No. 10.
4. ACTUATOR MOTOR AND MOTOR RELAY CIRCUIT CHECK
1. Disconnect connectors for ESP/TCS/ABS control unit and the
relay box.
2. Check for continuity between ESP/TCS/ABS control unit, the
relay.
Is inspection result OK?
YES >> GO TO 5.
NO >> Harness malfunction between ESP/TCS/ABS control unit, the ESP relay box.
5. MOTOR RELAY UNIT INSPECTION
Check the motor relay as a unit.
Is inspection result OK?
YES >> Check ESP/TCS/ABS control unit power supply circuit.
NO >> Replace the motor relay.
SFIA2206E
ESP Relay box
(harness connector E55)Body ground Voltage value
10 (W/R) – Battery voltage (approx. 12V)
ESP/TCS/ABS
control unit
(harness
connector E122)ESP relay box
(harness
connector E56and
E57)Continuity
20 (R/B) 4 (R/B) Yes
7 (G/W) 8 (G/W) Yes
SFIA2182E

TROUBLE DIAGNOSIS
BRC-101
[ESP/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

Inspection 9 Actuator Relay and CircuitEFS001AK
Inspection procedure
1. SELF-DIAGNOSIS RESULT CHECK 1
Check the self-diagnosis results.
Is
“MAIN RELAY” indicated in the self-diagnosis results?
YES >> GO TO 2.
NO >> INSPECTION END.
2. SELF-DIAGNOSIS RESULT CHECK 2
1. Disconnect ESP/TCS/ABS control unit connector. Securely connect them again.
2. Perform ESP/TCS/ABS control unit self-diagnosis again.
Is the same self-diagnosis item indicated?
YES >> GO TO 3.
NO >> Repair or replace the poorly connected connector.
3. ESP/TCS/ABS CONTROL UNIT GROUND CIRCUIT INSPECTION
1. Disconnect ESP/TCS/ABS control unit connector.
2. Check ESP/TCS/ABS control unit ground circuit.
Is inspection result OK?
YES >> GO TO 4.
NO >> Poor connection on ESP/TCS/ABS control unit connector or harness disconnection.
Self-diagnosis results
MAIN RELAY
SFIA2195E
ESP/TCS/ABS control unit
(harness connector E122)Body ground Continuity
28 (B) – Yes
29 (B) – Yes

TROUBLE DIAGNOSIS
BRC-103
[ESP/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

Inspection 10 Stop Lamp Switch and CircuitEFS001AL
Inspection procedure
1. SELF-DIAGNOSIS RESULT CHECK
Check the self-diagnosis results.
Is
“STOP LAMP SW” indicated in the self-diagnosis results?
YES >> GO TO 2.
NO >> INSPECTION END.
2. STOP LAMP INSPECTION
1. Disconnect connectors for stop lamp switch and ESP/TCS/ABS control unit.
2. Securely connect them again.
3. Start the engine.
4. Repeat depressing brake pedal carefully several times, then perform the self-diagnosis again.
Is the same self-diagnosis item indicated?
YES >> GO TO 3.
NO >> Repair or replace the poorly connected connector.
3. STOP LAMP SWITCH CIRCUIT CHECK
1. Disconnect connectors for stop lamp switch and ESP/TCS/
ABS control unit.
2. Check for the continuity between the stop lamp switch and ESP/
TCS/ABS control unit.
Is inspection result OK?
YES >> Perform ESP/TCS/ABS control unit self-diagnosis again.
NO >> The harness disconnection between ESP/TCS/ABS control unit and stop lamp switch.
Inspection 11 ESP/TCS/ABS Control Unit Power Supply CircuitEFS001AM
Inspection procedure
1. SELF-DIAGNOSIS RESULT CHECK 1
Check the self-diagnosis results.
Is
“BATTERY VOLTAGE [ABNORMAL]” indicated in the self-diagnosis results?
YES >> GO TO 2.
NO >> INSPECTION END.
Self-diagnosis results
STOP LAMP SW
SFIA2185E
ESP/TCS/ABS control unit
(harness connector E122)STOP LAMP SW
(harness connector M12)Continuity
48 (P) 2 (P) Yes
Self-diagnosis results
BATTERY VOLTAGE [ABNORMAL]

BRC-104
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS

2. SELF-DIAGNOSIS RESULT CHECK 2
1. Disconnect ESP/TCS/ABS control unit connector. Securely connect them again.
2. Perform the self-diagnosis.
Is the same self-diagnosis item indicated?
YES >> GO TO 3.
NO >> Repair or replace the poorly connected connector.
3. ESP/TCS/ABS CONTROL UNIT POWER SUPPLY CIRCUIT INSPECTION 1
1. Disconnect ESP/TCS/ABS control unit connector.
2. Turn ignition switch ON (engine not running), and check the volt-
age between ESP/TCS/ABS control unit and body ground.
Is inspection result OK?
YES >> GO TO 4.
NO >> GO TO 5.
4. ESP/TCS/ABS CONTROL UNIT GROUND CIRCUIT INSPECTION 1
Check ESP/TCS/ABS control unit ground circuit.
Is inspection result OK?
YES >> Perform the ESP/TCS/ABS control unit self-diagnosis again.
NO >> Harness disconnection or improper installation of the ESP/TCS/ABS control unit.
SFIA2186E
ESP/TCS/ABS control unit
(harness connector E122)Body ground Voltage value
1 (G/R) – Battery voltage (approx. 12V)
SFIA2187E
ESP/TCS/ABS control unit
(harness connector E122)Body ground Continuity
28 (B) – Yes
29 (B) – Yes

BRC-106
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS

2. SELF-DIAGNOSIS RESULT CHECK 2
Turn ignition switch OFF, and ON to erase the self-diagnosis results. And perform the ESP/TCS/ABS control
unit self-diagnosis again.
Is the same self-diagnosis item indicated again?
YES >> After replacing spiral cable (with the steering angle sensor), perform the neutral position adjust-
ment. Then conduct the self-diagnosis again.
NO >> Inspection End
Inspection 14 Brake Fluid Level of Reservoir Tank, Communication Circuit
between ESP/TCS/ABS Control Unit and Brake Fluid Level Warning Switch
EFS001AQ
Inspection procedure
1. SELF-DIAGNOSIS RESULT CHECK 1
Check the self-diagnosis results.
Does the brake warning light turn on?
YES >> Check the pad for wear. Check the brake fluid for leakage.
NO >> GO TO 2.
2. SELF-DIAGNOSIS RESULT CHECK 2
1. Disconnect connectors for the brake fluid level warning switch and ESP/TCS/ABS control unit.
2. Securely connect connectors. Perform the ESP/TCS/ABS control unit self-diagnosis again.
Is the same self-diagnosis item indicated again?
YES >> GO TO 3.
NO >> Poor connection of connector. Repair or replace the poorly connected connector.
3. CIRCUIT CHECK BETWEEN BRAKE FLUID LEVEL WARNING SWITCH AND ESP/TCS/ABS CON-
TROL UNIT
1. Disconnect connectors for brake fluid level warning switch and
ESP/TCS/ABS control unit.
2. Check for the continuity between the brake fluid level warning switch and the ESP/TCS/ABS control unit.
Is inspection result OK?
YES >> Perform the ESP/TCS/ABS control unit self-diagnosis again.
NO >> Repair or replace the disconnected harness.
Self-diagnosis results
BR FLUID LEVER LOW
SFIA2196E
ESP/TCS/ABS control unit
(harness connector E122)Brake fluid level warning switch
(harness connector E19)Continuity
40 (Y/B) 1 (Y/B) Yes