Mil "On" With O2 Sensor DTCS (ITB99-003)

Publication date: 1999-03-01
Reference number: ITB99-003

MIL "ON" WITH O2 SENSOR DTCS

TECHNICAL SERVICE BULLETIN

Reference Number(s): ITB99-003, Date of Issue: March 1, 1999

INFINITI:	1997-1999 QX4
CLASSIFICATION:	EC98-031
SECTION:	Engine Control System
APPLIED VEHICLE(S):	1997-1999 QX4 (JR50)
APPLIED DATE:	Manufactured prior to 11/17/98

SERVICE INFORMATION

If a 1997-1999 QX4 shows the MIL 'ON' and one or more of the following DTCs are stored in ECM:

97 vehicle: DTC P0130, P0150, P0136, or P0156
98-99 vehicle: DTC P0131, P0134, P0138, P0140, P0151, P0154, P0158, P0160,

use this bulletin to diagnose and repair the incident.

This incident can be caused by poor grounding between the intake manifold and the engine cylinder head. The incident can be verified with a voltage drop check (see below). The incident is corrected by the installation of a sub-harness between the intake manifold ground bolts for the engine harness and the right hand (RH) cylinder head to provide a direct grounding path.

SERVICE PROCEDURE

Check for poor grounding using a DVOM to 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.
1. If the voltage is less than 0.020V (20 millivolts), this bulletin does not apply. Use the service manual to diagnose this incident.
2. If the voltage is above 0.020V (20 millivolts), install the sub-harness shown in Fig 1 for additional grounding. Continue with step two of this bulletin.
  
  Fig 1: Grounding Cable
Route the sub-harness from the RH cylinder head, on the existing ECCS harness, towards the center front of the engine and then back towards the intake manifold collector (see Fig 2 ).

Fig 2: Sub-Harness Routing On Existing ECCS Harness
Secure the sub-harness end with the two larger eyelet's to the two available threaded holes in the RH head adjacent to the negative battery cable attachment point (see Fig 3 ). Use the two new hex bolts listed in the parts information.
CAUTION: To prevent damage, the sub-harness must be positioned more than 70 mm (2.8 in.) from the exhaust manifold.

Fig 3: Sub-Harness Secured to Right Hand Head & Intake Manifold
Secure the sub-harness to the ECCS harness at four (4) places (see Fig 4 ) using the wiring clips listed in the parts information. Note the spacing between the wiring clips shown in Fig 4 .

Fig 4: Sub-Harness Secured to ECCS Harness
Secure the sub-harness end with the two smaller eyelet's to two of the existing ground bolts located on the intake manifold (see Fig 4 ).
Trim the excess material from the newly installed wiring clips.

PARTS INFORMATION

Description	P/N / PFP	Qty
Harness - Engine Sub	24075-0W060	1
Wiring - Clip	01552-00401KK	4
Bolt - Hex	08146-8121G	2

CLAIMS INFORMATION

Submit a Primary Failed Part (PP) line using the following claims coding:

CLAIMS INFORMATION

Description

PFP

OP Code

SYM

DIA

FRT

Diagnosis & Installation of Engine Sub-Harness ⁽¹⁾

14035-V5203 (manifold Gasket)

RA90AA

0.5 hrs ⁽¹⁾

⁽¹⁾	Flat rate time includes sufficient time to perform the diagnosis as described in the procedure above. Do NOT claim this Op Code with any Section "EE" Op Code(s).