ecm INFINITI QX56 2010 Factory Service Manual

PCS
U1000 CAN COMM CIRCUITPCS-17
< COMPONENT DIAGNOSIS > [IPDM E/R]
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COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000005146508
Refer to
LAN-4, "System Description".
DTC LogicINFOID:0000000005146509
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
Diagnosis ProcedureINFOID:0000000005146510
1. PERFORM SELF DIAGNOSTIC
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Check “SELF-DIAG RESULTS” of IPDM E/R.
Is
“CAN COMM CIRCUIT” displayed?
YES >> Refer to LAN-5, "CAN Communication Control Circuit".
NO >> Refer to GI-38, "
Intermittent Incident".
DTCCONSULT-III display
description DTC Detection Condit
ion Possible cause
U1000 CAN COMM CIRCUIT When IPDM E/R cannot communicate CAN
communication signal continuously for 2
seconds or more In CAN communication system, any item (or items)
of the following listed below is malfunctioning.
• Receiving (TCM)
• Receiving (ECM)
• Receiving (BCM)
• Receiving (Combination meter)
Revision: April 20092010 QX56

PCS
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
PCS-23
< ECU DIAGNOSIS > [IPDM E/R]
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Te r m i n a l
Wire
color Signal name Signal
input/
output Measuring condition
Reference value(Approx.)
Igni-
tion
switch Operation or condition
1 B/Y Battery power supply Input OFF —Battery voltage
2 R Battery power supply Input OFF —Battery voltage
3BRECM relay Output— Ignition switch ON or START
Battery voltage
Ignition switch OFF or ACC 0V
4W/LECM relay Output— Ignition switch ON or START
Battery voltage
Ignition switch OFF or ACC 0V
6L Throttle control motor
relay Output —Ignition switch ON or START
Battery voltage
Ignition switch OFF or ACC 0V
7 W/B ECM relay control Input — Ignition switch ON or START
0V
Ignition switch OFF or ACC Battery voltage
8 R/B Fuse 54 Output —Ignition switch ON or START
Battery voltage
Ignition switch OFF or ACC 0V
10 G Fuse 45
(Canada only) Output ONDaytime light system active
0V
Daytime light system inactive Battery voltage
11 Y/B A/C compressor Output ON or
START A/C switch ON or defrost A/C
switch
Battery voltage
A/C switch OFF or defrost A/C
switch 0V
12 L/W Ignition switch sup-
plied power Input —OFF or ACC
0V
ON or START Battery voltage
13 B/Y Fuel pump relay Output — Ignition switch ON or START
Battery voltage
Ignition switch OFF or ACC 0V
14 Y/R Fuse 49 Output —Ignition switch ON or START
Battery voltage
Ignition switch OFF or ACC 0V
15 LG/B Fuse 50 Output —Ignition switch ON or START
Battery voltage
Ignition switch OFF or ACC 0V
16 G Fuse 51 Output —Ignition switch ON or START
Battery voltage
Ignition switch OFF or ACC 0V
17 W Fuse 55 Output —Ignition switch ON or START
Battery voltage
Ignition switch OFF or ACC 0V
19 W/R Starter motor Output START—Battery voltage
21 BR Ignition switch sup-
plied power
Input —OFF or ACC
0V
START Battery voltage
22 G Battery power supply Output OFF —Battery voltage
23 GR/W Door mirror defogger
output signal Output —When rear defogger switch is
ON
Battery voltage
When raker defogger switch is
OFF 0V
24 L Cooling fan relay Output — Conditions correct for cooling
fan operation
Battery voltage
Conditions not correct for
cooling fan operation 0V
Revision: April 20092010 QX56

PCS-30
< ECU DIAGNOSIS >[IPDM E/R]
IPDM E/R (INTELLIGENT POWER DI
STRIBUTION MODULE ENGINE ROOM)
Fail Safe
INFOID:0000000005146516
CAN COMMUNICATION CONTROL
When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With ECM
ABMIA1043GB
Revision: April 20092010 QX56

PG-46
< COMPONENT DIAGNOSIS >
HARNESS
D4 E6 B/8: Front combination lamp LH (with
daytime light system) C1 E119 W/16: IPDM E/R (intelligent power distribution
module engine room)
C2 E7 GR/2 : Fusible link box (battery) D1 E120 W/6: IPDM E/R (intelligent power distribution
module engine room)
C2 E9 — : Body ground E1 E121 BR/12: IPDM E/R (intelligent power distribution
module engine room)
D4 E11 B/8 : Front combination lamp LH (without
daytime light system) C1 E122 W/12: IPDM E/R (intelligent power distribution
module engine room)
D3 E12 B/5 : Stop lamp relay D1 E123 BR/8: IPDM E/R (intelligent power distribution
module engine room)
B2 E13 W/2 : Hood switch D1 E124 B/6: IPDM E/R (intelligent power distribution
module engine room)
D4 E14 — : Body ground F3 E125 B/47: ABS actuator and electric unit
(control unit)
C2 E15 — : Body ground D4 E126 — : Body ground
C1 E16 B/40 : ECM C2 E130 W/2 : Compressor motor relay
E4 E18 GR/2 : Front wheel sensor LH C3 E131 W/2 : Compressor motor relay
D1 E19 W/16 : To F33 D1 E134 GR/6 : ICC brake hold relay
E3 E21 GR/2 : Brake fluid level switch C2 E135 GR/2 : Transfer dropping resistor
E2 E23 GR/6 : Front wiper motor C1 E140 BR/6 : Trailer tow relay 2
D4 E24 — : Body ground B2 E153 W/2 : Transfer motor relay
F3 E25 BR/3 : Intelligent key warning buzzer B2 E154 W/2 : Transfer motor relay
C3 E27 BR/2 : Fusible link box (battery )D3 E156 L/4 : Trailer turn relay LH
C2 E30 /1 : Fusible link box (battery) D3 E157 L/4 : Trailer turn relay RH
E3 E31 B/3 : Front pressure sensor D5 E158 B/3 : Front sonar sensor LH outer
E3 E32 B/3 : Rear pressure sensor D5 E159 GR/3 : To E164
E1 E39 W/2 : To F34 B4 E160 GR/3 : To E165
D3 E40 B/3 : To E201 C3 E161 B/3 : Battery current sensor
D3 E41 SMJ : To C1 B4 E162 B/3 : Front sonar sensor LH inner
A4 E42 B/6 : ICC sensor C5 E163 B/3 : Front sonar sensor RH inner
E1 E46 B/5 : Transfer shift high relay D5 E164 GR/3 : To E159
D2 E47 B/5 : Transfer shift low relay A4 E165 GR/3 : To E160
C4 E48 B/3 : Refrigerant pressure sensor A3 E166 B/3 : Front sonar sensor RH outer
E3 E49 B/6 : Active booster Engine room sub-harness
D1 E69 L/4 : Transfer shut off relay D3 E201 B/3 : To E40
D5 E101 B/3 : Front turn/fog lamp LH C1 E202 /1 : Fusible link box (battery)
A4 E102 B/3 : Front turn/fog lamp RH C2 E203 — : Engine ground
C3 E103 B/5 : Daytime light relay C3 E204 /1 : Generator
D4 E105 BR/2 : Front and rear washer motor C3 E205 B/3 : Generator
E4 E106 BR/2 : Washer fluid level switch C3 E206 /1 : Generator
B3 E107 B/8 : Front combination lamp RH (without
daytime light system)
A3 E108 B/6 : Front combination lamp RH (with
daytime light system)
Revision: April 20092010 QX56

PG
HARNESSPG-49
< COMPONENT DIAGNOSIS >
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D5 F3 B/1 : A/C Compressor
D4 F42 GR/2 : Fuel injector No. 5
D5 F4 GR/1 : Oil pressure switch D3 F45 GR/2 : Fuel injector No. 7
D2 F5 GR/4 : Air fuel ratio (A/F) sensor 1 (ban k 2) B4 F46 B/3 : Power steering pressure sensor
C4 F6 GR/3 : Ignition coil No. 2 (with power transistor) E4 F47 GR/3 : Ignition coil No. 1 (with power transistor)
C3 F7 GR/3 : Ignition coil No. 4 (with power transistor) E4 F48 GR/3 : Ignition coil No. 3 (with power transistor)
C3 F8 GR/3 : Ignition coil No. 6 (with power transistor) E4 F49 GR/3 : Ignition coil No. 5 (with power transistor)
E2 F9 G/10 : A/T assembly D4 F50 B/6 : Electric throttle control actuator
C3 F10 — : Engine ground E4 F51 GR/3 : Ignition coil No. 7 (with power transistor)
D3 F11 B/3 : Crankshaft position sensor (POS) D2 F52 GR/3 : Ignition coil No. 8 (with power transistor)
E1 F12 G/4 : Heated oxygen sensor 2 (bank 2) E5 F53 B/6 : Mass air flow sensor
F2 F13 G/4 : Heated oxygen sensor 2 (bank 1) B2 F54 B/81 : ECM
B2 F14 W/24 : To E5 F1 F55 B/2 : ATP switch
D4 F15 GR/2 : EVAP canister purge volume control
solenoid valve F2 F56 B/8 : Transfer terminal cord assembly
E5 F16 — : Engine ground G1 F57 B/2 : Transfer motor
C4 F18 GR/2 : Fuel injector No. 2 F2 F58 GR/6 : Transfer control device
D4 F20 GR/2 : Fuel injector No. 4 F2 F59 B/2 : Wait detection switch
F4 F21 GR/2 : Condenser-1 F1 F60 GR/2 : Neutral-4LO switch
D3 F22 GR/2 : Fuel inje ctor No. 6 D5 F61 G/2: Intake valve timing control solenoid valve
(bank 1)
D4 F23 B/3 : Camshaft position sensor (phase) D5 F62 B/3 : Intake valve timing control position sensor
(bank 1)
D4 F26 B/6 : To F101 C4 F63 G/2: Intake valve timing control solenoid valve
(bank 2)
E3 F27 /1 : Starter motor C4 F64 B/3: Intake valve timing control position sensor
(bank 2)
E3 F28 GR/1 : Starter motor E3 F65 GR/4 : Air fuel ratio (A/F) sensor 1 (bank 1)
D4 F30 GR/2 : Fuel injector No. 1 C2 F68 GR/2 : Water valve
D3 F31 GR/2 : Fuel injector No. 8 Engine control sub-harness
B2 F32 W/16 : To E2 C3 F101 B/6 : To F26
C2 F33 W/16 : To E19 C3 F102 B/2 : Knock sensor (bank 1)
C2 F34 W/2 : To E39 C3 F103 GR/2 : Engine coolant temperature sensor
B3 F39 /1 : Fusible link box (battery) C3 F104 B/2 : Knock sensor (bank 2)
D4 F41 GR/2 : Fuel injector No. 3
Revision: April 20092010 QX56

PG
HARNESS CONNECTORPG-65
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• The slide-locking type connectors are disconnected by pushing or pulling the slider. Refer to the figure
below.
CAUTION:
• Do not pull the harness or wires when disconnecting the connector.
• Be careful not to damage the connector su pport bracket when disconnecting the connector.
[Example]
HARNESS CONNECTOR (LEVER LOCKING TYPE)
• Lever locking type harness connectors are used on certain control units and control modules such as ECM, ABS actuator and electric unit (control unit), etc.
• Lever locking type harness connectors are also us ed on super multiple junction (SMJ) connectors.
• Always confirm the lever is fully locked in place by mo ving the lever as far as it will go to ensure full connec-
tion.
CAUTION:
SEL769V
Revision: April 20092010 QX56

BCM (BODY CONTROL MODULE)PWC-95
< ECU DIAGNOSIS >
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DTC Inspection Priority ChartINFOID:0000000005367564
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000005367565
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 ma lfunction is present when current conditi on 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 condi tion if the malfunction is detected again.
Display contents of CONSULT Fail-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

PWC-96
< ECU DIAGNOSIS >
BCM (BODY CONTROL MODULE)
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

BCM (BODY CONTROL MODULE)RF-31
< ECU DIAGNOSIS >
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DTC Inspection Priority ChartINFOID:0000000005370302
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000005370303
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 ma lfunction is present when current conditi on 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 condi tion if the malfunction is detected again.
Display contents of CONSULT Fail-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

RF-32
< ECU DIAGNOSIS >
BCM (BODY CONTROL MODULE)
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