Infiniti M35/M45 Y50. Manual — part 597

POWER SUPPLY AND GROUND CIRCUIT

EC-861

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8.

CHECK ECM POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch OFF 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 15.

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

Check voltage between ECM terminal 111 and ground with CON-
SULT-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 18.

NG

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.

●

Harness or connectors E108, M15

●

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-862

[VK45DE]

POWER SUPPLY AND GROUND CIRCUIT

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 E108, M15

●

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 20A fuse from IPDM E/R.

2.

Check 20A fuse.

OK or NG

OK

>> GO TO 18.

NG

>> Replace 20A fuse.

15.

CHECK GROUND CONNECTIONS

1.

Loosen and retighten ground screws on the body.
Refer to

EC-864, "Ground Inspection"

.

OK or NG

OK

>> GO TO 16.

NG

>> Repair or replace ground connections.

Continuity should exist.

1.

Body ground M70

2.

Body ground M16

PBIB2782E

POWER SUPPLY AND GROUND CIRCUIT

EC-863

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16.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II

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 18.

NG

>> GO TO 17.

17.

DETECT MALFUNCTIONING PART

Check the following.

●

Harness or connectors F102, M72

●

Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

18.

CHECK INTERMITTENT INCIDENT

Refer to

EC-857, "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.

Continuity should exist.

EC-864

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POWER SUPPLY AND GROUND CIRCUIT

Ground Inspection

NBS005AZ

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-45, "Ground Distribution"

.

PBIB1870E