Diagnosis Procedure

Check 10A fuse [No. 3, located in the fuse block (J/B)].

Is the inspection result normal?

YES 

GO TO STEP 2  .

NO 

Replace the fuse after repairing the applicable circuit.

1. Turn the ignition switch OFF.
2. Disconnect the ECV connector.
3. Turn the ignition switch ON.
4. Check voltage between the ECV harness connector and ground.

   (+)		(-)		Voltage
   ECV		-
   Connector	Terminal
   F44	2	Ground		Battery voltage

Is the inspection result normal?

YES 

GO TO STEP 3  .

NO 

Repair the harnesses or connectors.

1. Turn the ignition switch OFF.
2. Connect the ECV connector.
3. Perform the self - diagnosis STEP - 4 (Code No. 45). Refer to DIAGNOSIS DESCRIPTION  (WITHOUT ACCS) or DIAGNOSIS DESCRIPTION  (WITH ACCS).
4. Check output waveform between the unified meter and A/C amp. harness connector and ground with the oscilloscope.

   (+)		(-)		Condition	Output waveform
   Unified meter and A/C amp.		-
   Connector	Terminal
   M67	65	Ground		Ignition switch ON Self-diagnosis. STEP-4 (Code No. 45)	Courtesy of NISSAN NORTH AMERICA, INC. Duty ratio: approx. 50 %

Is the inspection result normal?

YES 

Replace the compressor.

NO 

GO TO STEP 4  .

1. Turn the ignition switch OFF.
2. Disconnect the ECV connector.
3. Disconnect the unified meter and A/C amp. connector.
4. Check continuity between the ECV harness connector and unified meter and A/C amp. harness connector.

   ECV		Unified meter and A/C amp.		Continuity
   Connector	Terminal	Connector	Terminal
   F44	3	M67	65	Existed

5. Check for continuity between the ECV harness connector and ground.

   ECV		-	Continuity
   Connector	Terminal
   F44	3	Ground	Not existed

Is the inspection result normal?

YES 

GO TO STEP 5  .

NO 

Repair the harnesses or connectors.

Check continuity between the ECV connector terminals.

Is the inspection result normal?

YES 

Replace the unified meter and A/C amp.

NO 

Replace the compressor.