Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

INSPECTION START
Which malfunction (P0102 or P0103) is duplicated?

P0102 or P0103

P0102 >> GO TO 2.

P0103 >> GO TO 3.
CHECK INTAKE SYSTEM
Check the following for connection.
- Air duct
- Vacuum hoses
- Intake air passage between air duct to intake manifold
OK or NG

OK: GO TO 3.

NG: Reconnect the parts.
RETIGHTEN GROUND SCREWS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body.
Refer to "GROUND INSPECTION ".

Fig 1: Checking Ground Connections
Courtesy of NISSAN NORTH AMERICA, INC.

OK or NG

OK: GO TO 4.

NG: Repair or replace ground connections.
CHECK MASS AIR FLOW SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor (1) harness connector.
  - : Vehicle front
2. Turn ignition switch ON.
  
  Fig 2: Identifying Mass Air Flow Sensor
  Courtesy of NISSAN NORTH AMERICA, INC.
3. Check voltage between MAF sensor terminal 2 and ground with CONSULT or tester.
Voltage: Battery voltage

Fig 3: Checking Voltage Between MAF Sensor Terminal 2 And Ground Using Tester
Courtesy of NISSAN NORTH AMERICA, INC.

OK or NG

OK: GO TO 6.

NG: GO TO 5.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E2, F32
- IPDM E/R harness connector E119
- Harness for open or short between mass air flow sensor and IPDM E/R
- Harness for open or short between mass air flow sensor and ECM
Repair harness or connectors.
CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between MAF sensor terminal 3 and ECM terminal 67.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist .
4. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 7.

NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 51.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist .
2. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 8.

NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK MASS AIR FLOW SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 9.

NG: Replace mass air flow sensor. Refer to AIR CLEANER AND AIR DUCT .
CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

>> INSPECTION END