Electrical - MIL ON/O2 Sensor DTC's Set

Classification:
EC98-030B

Reference:
NTB99-004B

Date:
November 30, 2004

1996-00 PATHFINDER, 1999-2004 FRONTIER (V-6) AND 2000-
2004 XTERRA (V-6); MIL "ON" WITH 02 SENSOR DTCs

This amended version of NTB99-004 updates the Applied Vehicle Information Section. Please discard all This amended version of NTB99-004 paper copies of NTB99-004.

APPLIED VEHICLES:
1996-00 Pathfinder (R50)
1999-2004 Frontier (V-6 Engine Only)
2000-2004 Xterra (V-6 Engine Only)

IF YOU CONFIRM

If an applicable vehicle shows the MIL "ON" and one or more of the following DTCs are stored in ECM:

- 96-97 MY Pathfinder vehicle: DTC P0130, P0150, P0136, or P0156

- 98-00 MY Pathfinder vehicle: DTC P0131, P0134, P0138, P0140, P0151, P0154, P0158, P0160

- 99-01 MY Frontier (V-6 Engine Only) or 00-01 MY Xterra (V-6 Engine Only) vehicle:
DTC P0131, P0134, P0138, P0140, P0151, P0154, P0158, P0160

- 02-04 MY Frontier (V-6 Engine Only), 02-04 MY Xterra (V-6 Engine Only)
DTC P1143, P0134, P0138, P1163, P0154, P1146, P1166, P0158

ACTION

Use the Service Procedure in this bulletin to diagnose and repair the incident (if it should occur).

^ Perform a voltage drop test to check for a poor "ground" condition.

^ If necessary install a sub-harness between the intake manifold and the cylinder head to provide a direct path to "ground".

IMPORTANT:
The purpose of "ACTIONS" (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.





PARTS INFORMATION

CLAIMS INFORMATION





Submit a Primary Failed Part (PP) line using the claims coding shown.

SERVICE PROCEDURE

1. Check for poor grounding using a Digital Volt-Ohm Meter (DVOM).

^ You'll measure the voltage drop between the intake manifold ground bolt for the engine harness and the right hand (RH) cylinder head.

^ At engine warm idle, place the red meter lead on the intake manifold ground bolt for the engine ECCS harness and the black lead on RH cylinder head and measure the voltage.

A. If the voltage is less than 0.025V (25 millivolts), this bulletin does not apply. Use the ASIST & Electronic Service Manual to diagnose this incident.





B. If the voltage is above 0.025V (25 millivolts), install the sub-harness shown in Figure 1 to resolve the incident. Continue with step two of this bulletin.





2. Route the sub-harness from the RH cylinder head, on the existing ECCS harness. Route it towards the center front of the engine and then back towards the intake manifold collector (see Figure 2).





3. Find the two threaded holes in the RH cylinder head next to the negative battery cable attachment point. (see Figure 3)

^ Secure the sub-harness end with the two larger eyelets to these two threaded holes. (see Figure 3).

^ Use the two new hex bolts listed in the parts information to attach the sub-harness eyelets.

CAUTION:
To prevent damage, the sub-harness must be positioned more than 70 mm (2.8 in.) from the exhaust manifold.





4. Now attach the sub-harness to the ECCS harness at four (4) places (see Figure 4) using the wiring clips listed in the parts information. Space the wiring clips out as shown in Figure 4.

5. Secure the sub-harness end with the two smaller eyelets. You'll attach them using two of the existing ground bolts located on the intake manifold (see Figure 3).

6. Trim the excess material from the newly installed wiring clips.





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