XJR (X300) L6-4.0L SC (AJ16) (1995)
Air Injection Pump: Technical Service Bulletins
Air Pump - DTC PO411 Insufficient Air Flow
05.1-27
DATE
6/97
Amended 1/98
Sedan Range
MODEL
1995-97 MY
Sedan (4.0L) Range
VIN
720001-779500
Insufficient AIR Flow - AIR Pump (AIRP) - Diagnosis
Remove and destroy Bulletin 05.1-27, dated 6/97
Replace with this Bulletin.
Revisions are marked with a bar and asterisks.
ISSUE:
A revised AIR pump has been introduced on Sedan Range vehicles in production from approximately VIN 779500. The new pump is more heat
resistant.
The pump can be identified by a Julian date code of 002/*/96 or later. (The * in the date code indicates the shift during which the pump was assembled
which is not relevant to the design of the pump.)
This technical bulletin provides a diagnostic procedure to aid diagnosis when DTC P0411 has been flagged. Replacing the ECM will not solve the
complaint of flagging DTC P0411.
ACTION:
In case of a customer complaint on a Sedan Range vehicle within the above VIN range of MIL illumination, with DTC P0411 flagged, follow the
diagnostic flowchart in this bulletin. The following text provides additional information.
The statements in boxes correspond to boxes in the flow chart.
Perform diagnosis with the engine at normal operating temperature to ensure that the HO2S feedback is operating.
Does AIR pump operate?
The pump can be heard running and a light vibration can be felt.