Nissan Versa
Sedan Service Manual
Engine » Engine control system (EC)
Power supply and ground circuit

Diagnosis Procedure

1.CHECK GROUND CONNECTION

Turn ignition switch OFF.
Check ground connection E. Refer to Ground Inspection in GI, "Circuit Inspection".

Is the inspection result normal?

YES >> GO TO 2.

NO >> Repair or replace ground connection.

2.CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT

Disconnect ECM harness connectors.
Check the continuity between ECM harness connector and ground.

ECM		Ground	Continuity
Connector	Terminal
F10	10	Ground	Existed
	11
E16	108

3. Also check harness for short to power.

Is the inspection result normal?

YES >> GO TO 4.

NO >> GO TO 3.

3.DETECT MALFUNCTIONING PART

Check the following.

Harness connectors E55, F55
Harness for open or short between ECM and ground

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

4.CHECK ECM POWER SUPPLY CIRCUITI

Reconnect ECM harness connectors.
Turn ignition switch ON.
Check the voltage between ECM harness connector and ground.

ECM		Ground	Voltage
Connector	Terminal
F16	93	Ground	Battery voltage

Is the inspection result normal?

YES >> GO TO 6.

NO >> GO TO 5.

5.DETECT MALFUNCTIONING PART

Check the following.

10 A fuse (No. 55)
Harness for open or short between ECM and fuse

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

6.CHECK ECM POWER SUPPLY CIRCUITII

Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON and then OFF.

ECM		Ground	Voltage
Connector	Terminal
F16	106	Ground	After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0 V.

Is the inspection result normal?

YES >> GO TO 7.

NO >> GO TO 9.

7.CHECK ECM POWER SUPPLY CIRCUITIII

Turn ignition switch ON.
Check the voltage between IPDM E/R harness connector and ground.

IPDM E/R		Ground	Voltage
Connector	Terminal
F43	50	Ground	Battery voltage

Is the inspection result normal?

YES >> GO TO 8.

NO >> Replace IPDM E/R. Refer to PCS, "Removal and Installation" (WITH IKEY) or PCS, "Removal and Installation" (WITHOUT IKEY).

8.CHECK INTERMITTENT INCIDENT

Refer to GI, "Intermittent Incident".

>> INSPECTION END

9.CHECK ECM POWER SUPPLY CIRCUITIV

Turn ignition switch OFF and wait at least 10 seconds.
Check the voltage between ECM harness connector and ground.

ECM		Ground	Voltage
Connector	Terminal
F10	32	Ground	Battery voltage

Is the inspection result normal?

YES >> GO TO 13.

NO >> GO TO 10.

10.CHECK ECM POWER SUPPLY CIRCUITV

Disconnect ECM harness connector.
Disconnect IPDM E/R harness connector F.
Check the continuity between ECM harness connector and IPDM E/R harness connector.

ECM		IPDM E/R		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F10	32	F43	50	Existed

4. Also check harness for short to ground and short to power.

Is the inspection result normal?

YES >> GO TO 12.

NO >> GO TO 11.

11.DETECT MALFUNCTIONING PART

Check the following.

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.

12.CHECK 20 A FUSE

Disconnect 20 A fuse (No. 53) from IPDM E/R.
Check 20 A fuse.

Is the inspection result normal?

YES >> GO TO 14.

NO >> Replace 20 A fuse.

13.CHECK ECM POWER SUPPLY CIRCUITVI

Disconnect ECM harness connector.
Disconnect IPDM E/R harness connector E44.
Check the continuity between ECM harness connector and IPDM E/R harness connector.