ECU INFINITI QX56 2010 Factory Service Manual

BCS-54
< ECU DIAGNOSIS >[BCM]
BCM (BODY CONTROL MODULE)
DTC Inspection Priority Chart
INFOID:0000000005146433
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000005146434
NOTE: Details of time display
• CRNT: Displays when there is a malfunction now or after returning to the normal condition until turning igni- tion switch OFF → ON again.
• 1 - 39: Displayed if any previous malfunction is present when current condition is normal. It increases like 1
→ 2 → 3...38 → 39 after returning to the normal condition whenever ignition switch OFF → ON. The counter
remains at 39 even if the number of cycles exceeds it. It is counted from 1 again when turning ignition switch
OFF → ON after returning to the normal condition if the malfunction is detected again.
Display contents of CONS ULTFail-safe Cancellation
U1000: CAN COMM CIRCUIT I nhibit engine crankingWhen the BCM re-establishes communication with the other mod-
ules.
Priority
DTC
1 • U1000: CAN COMM CIRCUIT
2 • B2190: NATS ANTENNA AMP
• B2191: DIFFERENCE OF KEY
• B2192: ID DISCORD BCM-ECM
• B2193: CHAIN OF BCM-ECM
• B2013: STRG COMM 1
• B2552: INTELLIGENT KEY
• B2590: NATS MALFUNCTION
3 • C1729: VHCL SPEED SIG ERR
• C1735: IGNITION SIGNAL
4 • C1708: [NO DATA] FL
• C1709: [NO DATA] FR
• C1710: [NO DATA] RR
• C1711: [NO DATA] RL
• C1712: [CHECKSUM ERR] FL
• C1713: [CHECKSUM ERR] FR
• C1714: [CHECKSUM ERR] RR
• C1715: [CHECKSUM ERR] RL
• C1716: [PRESSDATA ERR] FL
• C1717: [PRESSDATA ERR] FR
• C1718: [PRESSDATA ERR] RR
• C1719: [PRESSDATA ERR] RL
• C1720: [CODE ERR] FL
• C1721: [CODE ERR] FR
• C1722: [CODE ERR] RR
• C1723: [CODE ERR] RL
• C1724: [BATT VOLT LOW] FL
• C1725: [BATT VOLT LOW] FR
• C1726: [BATT VOLT LOW] RR
• C1727: [BATT VOLT LOW] RL
CONSULT display
Fail-safeIntelligent Key
warning lamp ON Tire pressure
monitor warning lamp ON Reference page
No DTC is detected.
further testing
may be required. ————
U1000: CAN COMM CIRCUIT ———BCS-32
B2190: NATS ANTENNA AMP ———SEC-31
Revision: April 20092010 QX56

BCS
BCM (BODY CONTROL MODULE)BCS-55
< ECU DIAGNOSIS > [BCM]
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B2191: DIFFERENCE OF KEY
———SEC-34
B2192: ID DISCORD BCM-ECM ———SEC-35
B2193: CHAIN OF BCM-ECM ———SEC-37
B2552: INTELLIGENT KEY ———SEC-39
B2590: NATS MALFUNCTION ———SEC-40
C1708: [NO DATA] FL ———WT-14
C1709: [NO DATA] FR ———WT-14
C1710: [NO DATA] RR ———WT-14
C1711: [NO DATA] RL ———WT-14
C1712: [CHECKSUM ERR] FL ———WT-16
C1713: [CHECKSUM ERR] FR ———WT-16
C1714: [CHECKSUM ERR] RR ———WT-16
C1715: [CHECKSUM ERR] RL ———WT-16
C1716: [PRESSDATA ERR] FL ———WT-18
C1717: [PRESSDATA ERR] FR ———WT-18
C1718: [PRESSDATA ERR] RR ———WT-18
C1719: [PRESSDATA ERR] RL ———WT-18
C1720: [CODE ERR] FL ———WT-16
C1721: [CODE ERR] FR ———WT-16
C1722: [CODE ERR] RR ———WT-16
C1723: [CODE ERR] RL ———WT-16
C1724: [BATT VOLT LOW] FL ———WT-16
C1725: [BATT VOLT LOW] FR ———WT-16
C1726: [BATT VOLT LOW] RR ———WT-16
C1727: [BATT VOLT LOW] RL ———WT-16
C1729: VHCL SPEED SIG ERR ———WT-19
C1735: IGNITION SIGNAL ———WT-20
CONSULT display Fail-safeIntelligent Key
warning lamp ON Tire pressure
monitor warning
lamp ON Reference page
Revision: April 20092010 QX56

BR-22
< ON-VEHICLE REPAIR >
BRAKE TUBE AND HOSE
3. Remove brake tube from brake hose, using a suitable tool.
4. Remove lock plate and brake hose from bracket.
5. Remove union bolt and then remove brake hose from cylinderbody.
INSTALLATION
1. Install brake hose by aligning with the protrusion on cylinderbody, then install the union bolt and new copper washers and
tighten to specification. Refer to BR-13, "
Hydraulic Circuit".
CAUTION:
Do not reuse copper washer.
2. Insert brake hose end through bracket, then secure it to bracket with lock plate.
3. Install brake tube to brake hose, then tighten the flare nut using a suitable tool. Refer to BR-13, "
Hydraulic Circuit".
4. Refill brake fluid and bleed air. Refer to BR-17, "
Drain and Refill".
5. Install front wheel and tire using power tool. Refer to WT-49, "
Rotation".
Removal and Installation of Rear Brake Piping and Brake HoseINFOID:0000000005147907
REMOVAL
1. Remove rear wheel and tire using power tool.
2. Remove brake reservoir cap.
LFIA0213E
LFIA0214E
SFIA1137E
LFIA0213E
Revision: April 20092010 QX56

BRAKE TUBE AND HOSEBR-23
< ON-VEHICLE REPAIR >
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3. Remove brake tube from brake hose, using a suitable tool.
4. Remove lock plate and brake hose from bracket.
5. Remove union bolt and then remove brake hose from cylinder body.
INSTALLATION
1. Install brake hose by aligning with the protrusion on cylinderbody, then install the union bolt and new copper washers and
tighten to specification. Refer to BR-13, "
Hydraulic Circuit".
CAUTION:
Do not reuse copper washer.
2. Insert brake hose end through bracket, then secure it to bracket with lock plate.
3. Install brake tube to brake hose, then tighten the flare nut using a suitable tool. Refer to BR-13, "
Hydraulic Circuit".
4. Refill brake fluid and bleed air. Refer to BR-17, "
Bleeding Brake System".
5. Install rear wheel and tire using power tool. Refer to WT-49, "
Rotation".
Inspection After InstallationINFOID:0000000005147908
CAUTION:
Brake tubes and hoses are important safety parts. Always disassemble the parts and retighten their fit-
tings, if a brake fluid leak is detected. Replace applicable part with a new one, if a damaged part is
detected.
LFIA0213E
LFIA0212E
SFIA1137E
LFIA0213E
Revision: April 20092010 QX56

BRAKE BOOSTERBR-27
< ON-VEHICLE REPAIR >
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1. Using a hand vacuum pump, apply a vacuum of – 66.7 kPa (– 500 mmHg, –19.69 inHg) to brake booster.
2. Check output rod length.
INSTALLATION
1. Loosen lock nut to adjust input r od length so that the length (B)
is set at the specified value.
2. After adjusting length (B), temporarily tighten lock nut and install brake booster and spacer block.
• Install the gaskets and spacer block between brake boosterand dash panel.
3. Connect brake pedal to clevis on the input rod.
4. Install brake booster to brake pedal assembly nuts and tighten to the specified torque.
5. Connect active boost and delta stroke s ensor harness connectors to brake booster.
6. Connect vacuum hose to brake booster.
7. Install master cylinder assembly to brake booster. Refer to BR-25, "
Removal and Installation".
8. Adjust the height and play of brake pedal. Refer to BR-15, "
Inspection and Adjustment".
9. Tighten lock nut of input rod to specification.
10. Install instrument lower panel LH. Refer to IP-14, "
Removal and Installation".
11. Secure A/C line into clips.
12. Install cowl top extension. Refer to EXT-18, "
Removal and Installation".
13. Install engine air duct assembly. Refer to EM-25, "
Removal and Installation".
14. Install engine room cover. Refer to EM-24, "
Removal and Installation".
15. Refill with new brake fluid and bleed air. Refer to BR-17, "
Bleeding Brake System".
Output rod length : Refer to
BR-46, "
Brake
Booster".
SBR208E
Input rod length (B) : Refer to BR-46, "Brake
Booster".
WFIA0382E
Revision: April 20092010 QX56

BR-30
< ON-VEHICLE REPAIR >
FRONT DISC BRAKE
4. Hang cylinder body with a wire, and remove pads, pad retainers,shims, and shim cover from torque member.
CAUTION:
When removing the pad retainer from the torque member,
lift it in the direction indi cated by the arrow as shown so
that it does not deform.
INSTALLATION
1. Push pistons in using suitable tool.
CAUTION:
By pushing in pistons, brake fluid returns to m aster cylinder reservoir tank. Watch the brake fluid
level in the reservoir tank.
NOTE:
Using a suitable tool, makes it easier to push in the pistons.
2. Apply Molykote M-77 grease or equivalent to between shim cover and shim. Install outer shim, outer shim cover to inner pad, and inner multi-layered shim to outer pad.
3. Apply Molykote M-77 grease or equivalent to between pad retainer and pad. Install pad retainers and pads to torque member.
4. Apply Molykote M-77 grease or equivalent to the piston face. Install pad return lever securely to pad wear sensor as shown.
CAUTION:
• Securely assemble pad retainers so that they are not
being lifted up from torque member.
• Both inner and outer pads have a pad return system on
the pad retainer. Install pad return lever securely to pad
wear sensor.
5. Install pads to cylinder body.
6. Install cylinder body to torque member. CAUTION:
In the case of replacing a pad with new one, ch eck the brake fluid level in the reservoir tank
because brake fluid returns to reservoir tank when pressing piston in.
NOTE:
Use a suitable tool to easily press piston.
7. Apply rubber grease and install sliding pin bolts, and tighten to the specified torque. Refer to BR-31,
"Exploded View of Brake Caliper".
8. Check front disc brake for drag.
9. Install front wheel and tires. Refer to WT-49, "
Rotation".
Brake Burnishing ProcedureINFOID:0000000005147914
Burnish contact surfaces between disc rotors and pads according to following procedure after refinishing or
replacing rotors, after replacing pads, or if a soft pedal occurs at very low mileage.
CAUTION:
• Be careful of vehicle speed because the brake does not operate easily until pad and disc rotor are
securely seated.
• Only perform this procedure under safe road and traffic conditions. Use extreme caution.
1. Drive vehicle on straight, flat road.
2. Depress brake pedal with the power to stop vehicle within 3 to 5 seconds until the vehicle stops.
3. Drive without depressing brake for a few minutes to cool the brake.
4. Repeat steps 1 through 3 until pad and disc rotor are securely seated.
SBR556E
SBR557E
Revision: April 20092010 QX56

FRONT DISC BRAKEBR-33
< ON-VEHICLE REPAIR >
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3. Install brake hose to brake caliper assembly using new copper washers. Align the brake hose to the projection as shown and
tighten union bolts to the specified torque.
CAUTION:
• Do not reuse copper washers.
• Securely attach brake hose to projection on cylinderbody.
4. Refill with new brake fluid and bleed air. Refer to BR-17, "
Bleeding Brake System".
5. Check front disc brake for drag and correct as necessary.
6. Install front wheel and tire. Refer to WT-49, "
Rotation".
SFIA2431E
Revision: April 20092010 QX56

REAR DISC BRAKEBR-35
< ON-VEHICLE REPAIR >
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2. Apply Molykote M-77 grease to knuckle slide where brake pad contacts and to the outer multi-layered
shim, pad retainers and inner shim.
CAUTION:
Do not get grease on the brake pads or brake rotor friction surfaces.
3. Install pads, shims, cover and retainers to cylinder body.
4. Apply rubber grease to the sliding sleeves and install cylinder body, sliding sleeves and sliding pin bolts and tighten to specification. Refer to BR-35, "
Exploded View of Brake Caliper".
5. Check rear disc brake for drag.
6. Install rear wheel and tires. Refer to WT-49, "
Rotation".
Brake Burnishing ProcedureINFOID:0000000005147919
Burnish contact surfaces between disc rotors and pads according to following procedure after refinishing or
replacing rotors, after replacing pads, or if a soft pedal occurs at very low mileage.
CAUTION:
• Be careful of vehicle speed because the brake does not operate easily until pad and disc rotor are securely seated.
• Only perform this procedure under safe road and traffic conditions. Use extreme caution.
1. Drive vehicle on straight, flat road.
2. Depress brake pedal with the power to stop vehicle within 3 to 5 seconds until the vehicle stops.
3. Drive without depressing brake for a few minutes to cool the brake.
4. Repeat steps 1 through 3 until pad and disc rotor are securely seated.
Exploded View of Brake CaliperINFOID:0000000005147920
1. Union bolt 2. Brake hose 3. Copper washer
4. Cap 5. Bleed valve 6. Sliding pin bolt
7. Cylinder body 8. Piston seal 9. Piston
10. Piston boot 11. Knuckle slide 12. Sliding sleeve boot
AWFIA0423GB
Revision: April 20092010 QX56

BR-36
< ON-VEHICLE REPAIR >
REAR DISC BRAKE
Removal and Installation of Brake Caliper and Disc Rotor
INFOID:0000000005147921
WARNING:
Clean dust on caliper and brake pad with a vacuum dust collector to minimize the hazard of air borne
particles or other materials.
CAUTION:
• While removing cylinder body, do not depress brake pedal because piston will pop out.
• Do not damage piston boot.
• Keep rotor free from brake fluid.
• Refill with new specified brake fluid.
• Burnish brake contact surface after refinishing or re placing rotors, after replacing pads, or it a soft
pedal occurs at very low mileage. Refer to BR-35, "
Brake Burnishing Procedure".
REMOVAL
1. Remove rear wheel and tire using power tool.
2. Fasten disc rotor using wheel nut.
3. Remove brake reservoir cap.
4. Remove union bolt and cylinder body bolts, then remove cylin-
der body.
NOTE:
Discard the copper washers, do not reuse.
5. Apply matching marks to disc rotor and wheel hub assembly if the disc rotor is to be reused, then remove disc rotor.
CAUTION:
Put matching marks on wheel hub assembly and disc rotor
if the disc rotor is to be reused.
INSTALLATION
1. If reusing the disc rotor, use the matching marks to align disc rotor on the wheel hub assembly, then install
disc rotor using a wheel nut to hold it in place.
CAUTION:
Use matching marks on wheel hub assembly and di sc rotor if the disc rotor is to be reused.
2. Install cylinder body and tighten cylinder body bolts to specification. CAUTION:
Before installing cylinder body to the vehic le, wipe off mating surface of cylinder body.
3. Install brake hose to cylinder body with new copper washers and tighten union bolt to specification.
CAUTION:
• Do not reuse copper washers.
• Securely attach brake hose to projection on cylinderbody.
4. Refill with new brake fluid and bleed. Refer to BR-17, "
Bleeding
Brake System".
5. Check rear disc brake for drag and correct as necessary.
6. Install rear wheel and tire. Refer to WT-49, "
Rotation".
13. Sliding sleeveB. Brake fluid R. Rubber grease
M. Molykote M-77 Front
LFIA0211E
SFIA1137E
Revision: April 20092010 QX56

FRONT DISC BRAKEBR-41
< DISASSEMBLY AND ASSEMBLY >
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3. Apply Molykote M-77 grease to piston boots. Cover the piston ends with piston boots, and then install cylinder side lip on piston
boots securely into the grooves on cylinder body.
CAUTION:
Do not reuse piston boots.
4. Apply clean brake fluid to pistons, then install pistons into cylin- der body and insert piston boot side lip into groove of pistons as
shown.
CAUTION:
Press the pistons evenly to prevent damage to cylinder
wall.
5. Apply rubber grease and insert into cylinder body by hand and insert piston bo\
ot piston-side lip into piston groove.
CAUTION:
Press pistons evenly and vary the pr essing point to prevent cylinder inner wall from being rubbed.
6. Apply rubber grease and install sliding pins, bushing and sliding pin boots to torque member.
7. Install the pads, shims, shim cover, and pad retainers from the torque member.
8. Install cylinder body. Tighten sliding pin bolts to the specified torque.
SFIA2432E
WFIA0211E
Revision: April 20092010 QX56