2005 INFINITI FX35 vq35de

POWER SUPPLY AND GROUND CIRCUIT EC-165
[VQ35DE]
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Revision: 2005 July 2005 FX
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic ProcedureABS006L8
1. INSPECTION START
Start engine.
Is engine running?
Ye s o r N o
Ye s > > G O T O 8 .
No >> GO TO 2.
2. CHECK ECM POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF and then ON.
2. Check voltage between ECM terminal 109 and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following.

Fuse block (J/B) connector M1

15A fuse

Harness for open or short between ECM and fuse
>> Repair open circuit or short ground or short power in harness or connectors.
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
1 B ECM ground [Engine is running]

Idle speedBody ground
109 W/L Ignition switch [Ignition switch: OFF]
0V
[Ignition switch: ON] BATTERY VOLTAGE
(11 - 14V)
111 W / B ECM relay
(Self shut-off) [Engine is running]
[Ignition switch: OFF]

For a few seconds after turning ignition
switch OFF 0 - 1.5V
[Ignition switch: OFF]

More than a few seconds after turning igni-
tion switch OFF BATTERY VOLTAGE
(11 - 14V)
11 5
11 6 B/R
B/W ECM ground [Engine is running]

Idle speed Body ground
11 9
120 R
R Power supply for ECM
[Ignition switch: ON] BATTERY VOLTAGE
(11 - 14V)
Voltage: Battery voltage
MBIB0015E

EC-166
[VQ35DE]
POWER SUPPLY AND GROUND CIRCUIT
Revision: 2005 July 2005 FX
4. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body. Refer to EC-170, "
Ground Inspection" .
OK or NG
OK >> GO TO 5.
NG >> Repair or replace ground connections.
5. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 1, 115, 116 and ground. Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors F102, M82

Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors.
7. CHECK ECM POWER SUPPLY CIRCUIT-II
1. Reconnect ECM harness connector.
2. Turn ignition switch ON.
3. Check voltage between IPDM E/R connector E7 terminal 17 and ground with CONSULT-II or tester.
OK or NG
OK >> Go to EC-648, "IGNITION SIGNAL" .
NG >> GO TO 8.
PBIB2625E
Continuity should exist.
Voltage: Battery voltage
PBIB1610E

POWER SUPPLY AND GROUND CIRCUIT EC-167
[VQ35DE]
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Revision: 2005 July 2005 FX
8. CHECK ECM POWER SUPPLY CIRCUIT-III
1. Stop engine and wait at least 10 seconds.
2. Turn ignition switch ON and then OFF.
3. Check voltage between ECM terminals 119, 120 and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 18.
NG (Battery voltage does not exist.)>>GO TO 9.
NG (Battery voltage exists for more than a few seconds.)>>GO TO 12.
9. CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Turn ignition switch OFF, and wait at least 10 seconds.
2. Check voltage between ECM terminal 111 and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 10.
NG >> GO TO 12.
10. CHECK ECM POWER SUPPLY CIRCUIT-V
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E7.
3. Check harness continuity between ECM terminals 119, 120 and IPDM E/R terminal 18. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 15.
NG >> GO TO 11.
11 . DETECT MALFUNCTIONING PART
Check the following.

Harness or connectors E211, M41

Harness for open or short between ECM and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
Voltage: After turning ignition switch OFF, battery
voltage will exist for a few seconds, then
drop approximately 0V.
PBIB1630E
Voltage: Battery voltage
PBIB1191E
Continuity should exist.

EC-168
[VQ35DE]
POWER SUPPLY AND GROUND CIRCUIT
Revision: 2005 July 2005 FX
12. CHECK ECM POWER SUPPLY CIRCUIT-VI
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E9.
3. Check harness continuity between ECM terminal 111 and IPDM E/R terminal 46. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 14.
NG >> GO TO 13.
13. DETECT MALFUNCTIONING PART
Check the following.

Harness or connectors E211, M41

Harness for open or short between ECM and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK 20A FUSE
1. Disconnect 20 A fuse from IPDM E/R.
2. Check 20A fuse.
OK or NG
OK >> GO TO 18.
NG >> Replace 20A fuse.
15. CHECK GROUND CONNECTIONS
Loosen and retighten ground three screws on the body. Refer to EC-170, "
Ground Inspection" .
OK or NG
OK >> GO TO 16.
NG >> Repair or replace ground connections.
16. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1. Check harness continuity between ECM terminals 1, 115, 116 and ground. Refer to Wiring Diagram.
2. Also check harness for short to power.
OK or NG
OK >> GO TO 17.
NG >> Repair open circuit or short to power in harness or connectors. Continuity should exist.
PBIB2625E
Continuity should exist.

POWER SUPPLY AND GROUND CIRCUIT EC-169
[VQ35DE]
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Revision: 2005 July 2005 FX
17. DETECTION MALFUNCTIONING PART
Check the following.

Harness connectors F102, M82

Harness for open or short between ECM and ground
>> Repair open circuit or shoat to power in harness connectors.
18. CHECK INTERMITTENT INCIDENT
Refer to EC-163, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> Replace IPDM E/R.
NG >> Repair open circuit or short to power in harness or connectors.

EC-170
[VQ35DE]
POWER SUPPLY AND GROUND CIRCUIT
Revision: 2005 July 2005 FX
Ground Inspection ABS00AN1
Ground connections are very important to the proper operation of electrical and electronic circuits. Ground
connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can
become an unwanted resistance. This unwanted resistance can change the way a circuit works.
Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drasti-
cally affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even
when the ground connection looks clean, there can be a thin film of rust on the surface.
When inspecting a ground connection follow these rules:

Remove the ground bolt or screw.

Inspect all mating surfaces for tarnish, dirt, rust, etc.

Clean as required to assure good contact.

Reinstall bolt or screw securely.

Inspect for “add-on” accessories which may be interfering with the ground circuit.

If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the
wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one
eyelet make sure no ground wires have excess wire insulation.
For detailed ground distribution information, refer to PG-31, "
Ground Distribution" .
PBIB1870E

DTC U1000, U1001 CAN COMMUNICATION LINE EC-171
[VQ35DE]
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Revision: 2005 July 2005 FX
DTC U1000, U1001 CAN COMMUNICATION LINEPFP:23710
DescriptionABS006L9
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
On Board Diagnosis LogicABS006LA
*1: This self-diagnosis has the one trip detection logic.
*2: The MIL will not light up for this diagnosis.
DTC Confirmation ProcedureABS006LB
1. Turn ignition switch ON and wait at least 3 seconds.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. If 1st trip DTC is detected, go to EC-173, "
Diagnostic Procedure" .
DTC No. Trouble diagnosis
name DTC detecting condition Possible cause
U1000*
1
1000*1CAN communication
line

ECM cannot communicate to other control
units.

ECM cannot communicate for more than the
specified time.

Harness or connectors
(CAN communication line is open or
shorted)
U1001*
2
1001*2

EC-172
[VQ35DE]
DTC U1000, U1001 CAN COMMUNICATION LINE
Revision: 2005 July 2005 FX
Wiring DiagramABS006LC
TBWM0218E