Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
  
  Fig 1: Locating Body Ground Screws
  Courtesy of NISSAN NORTH AMERICA, INC.
OK or NG

OK: GO TO 2.

NG: Repair or replace ground connections.
CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 2 harness connector.
  
  Fig 2: Identifying Heated Oxygen Sensor 2 Harness Connector
  Courtesy of NISSAN NORTH AMERICA, INC.
2. Turn ignition switch ON.
3. Check voltage between HO2S2 terminal 3 and ground with CONSULT-II or tester.
Voltage: Battery voltage

OK or NG

OK: GO TO 4.

NG: GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E2, F32
- IPDM E/R harness connector E119
- 15A fuse
- Harness for open or short between heated oxygen sensor 2 and fuse
  Repair harness or connectors.

CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check harness continuity between ECM terminal and HO2S2 terminal as follows. Refer to Wiring Diagram .

CONTINUITY REFERENCE CHART

DTC	Terminals		Bank
DTC	ECM	Sensor	Bank
P0037, P0038	25	2	1
P0057, P0058	6	2	2

Continuity should exist.

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

OK or NG

OK: GO TO 5.

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

CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 6.

NG: Replace malfunctioning heated oxygen sensor 2.
CHECK INTERMITTENT INCIDENT

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

INSPECTION END