ECM - MIL ON DTC P0461 Set

No: 19/08/97/NAS

Ref: WSM section 19

Issue: 1

Date: 10/06/97

PRIDE V 1-18

EVAPS Fuel Level Sensing Fault P0461

AFFECTED VEHICLE RANGE

DISCOVERY (LJ) All Advanced EVAPS equipped
Up to VA727076 (automatic)
Up to VA726789 (manual)
Up to VA558898

SITUATION:

MIL ILLUMINATION, CODE P0461

In some cases an Advanced EVAPS equipped vehicle can have a MIL illumination with a Fuel Level Sensing Fault P0461 set. If the gauge is functioning normally and Fault PO461 is present, follow the procedure outlined below.

If the fuel gauge is inoperative, the fuel gauge problem must be resolved before proceeding with the PROM replacement procedure. It is likely that the problem that is causing the fuel gauge to be inoperative is also causing the MIL illumination

RESOLUTION:

REPLACE GEMS PROM

NOTE:
Do not replace the fuel pump assembly in an attempt to resolve this problem.

Fault P0461 with a normally functioning fuel gauge can be resolved by a software change to the PROM of the GEMS ECM.

NOTE:
The repairs outlined in this TIB are to be performed to resolve customer complaint of the symptoms described.

PARTS INFORMATION:

PRM9652 PROM Automatic
PRM9653 PROM Manual
LRNASTATK Anti-Static Mat

NOTE:
PROM sets will only be released with the approval of the GEMS HelpLine.

WARRANTY CLAIMS:

19.22.96 Time: 1.25 hrs.
TestBook Diagnosis and Code Retrieval. FAX DTCR, Drive Cycle "C"

19.22.0461 Time: 0.05 hrs.
Code P0461

18.30.89.26 Time: 0.5 hrs.
Replace PROM

COMP CODE: 7G1A

Normal warranty policy and procedures apply

REPAIR PROCEDURE:

1. Connect TestBook and retrieve codes.

2. Complete a DTCR complete with freeze4rame data.

3. Check the fuel level sensor for output within 0.196v-4.8v.

4. Check fuel gauge operation.

5. If no problem is found with the sensor and the fuel gauge functions properly FAX DTCR to GEMS HelpLine for approval of PROM replacement.

5. After PROM replacement, reset engine adaptations and set Base Idle to give an IACV position of 20-25 steps.