Instruments - Fuel Gauge Falsely Shows Full Or 3/4

Title DIM: Fuel gauge indicating full or 3/4 with almost empty tank

Ref No US10669.6.0 en-GB

Issuer -

Partner 3 US 7510 Volvo Cars North America

Func Group 3811

Func Desc combined instrument, complete

Status Released

Status Date 2005-12-01

Issue Date 2005-12-01

Reference Q1-019922





Attachment





Vehicle Type





CSC Customer Symptom Codes

DTC Diagnostic Trouble Codes

Text

DESCRIPTION:

We've received reports about incorrect fuel gauge indication after ignition on for cars with almost empty fuel tank. In some cases it was reported that the fuel gauge indicated Full, and in some cases it indicated 3/4. In all cases the fuel gauge slowly moves to the correct indication during driving. This slow return to the proper level is the result of a damping function and can take as long as 1 min for each 1,5 liters. It is also reported that the dropping of the fuel gauge can occur over multiple key cycles. This happens if there has not been enough driving time for the gauge to reach the actual fuel level and the damped value is stored for the next start.

An investigation has revealed a fault with the data sampling of the fuel sending unit by the CEM. The fault has been reproduced when the customer meets the following conditions:

1. Fuel level is low

2. Ignition key in position 0

3. Driver door opened and kept open for more than 1 minute (LS CAN must go to sleep)

4. Ignition key turned fast from position 0 to position 2 or 3 (fuel sender reading takes place before Low Speed CAN is active)

PRODUCT MODIFICATION:

New CEM software was introduced in production beginning with structure week 200542 starting with the chassis numbers below:

^ 544 - 181887

^ 545 - 184441

MATERIAL RETURN: N/A

TECHNICAL REPORT:

* Yes, but only for cases where the new 2005 week 42 software has been loaded and the

* condition still exists. Also, please continue to report other unrelated cases/concerns with

* the fuel gauge.

SERVICE:

* Software is now available for all model years and structure weeks. To solve the concern

* identified in this TJ download CEM upgrade P/N 30667202.

VSTG OPERATION NUMBER:

36004-2 software control module downloading.

ATTACHMENT




















Fuel Level Translation table P1