The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

'94 960; Motronic 1.8 DTC: 5-1-2 Troubleshooting 900

posted by  daidnik on  Thu Oct 5 09:53 CST 2006
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Thu Jan 20 22:02 CST 2011
[RELATED]

This error code cites problem with "Short Term Fuel Trim". Procedure in Volvo "Green" book cites use of Volvo diagnostic scanner (which I don't have of course) to read voltage on MAF sensor I believe (2.3 -2.4 V @ idle). After that it says to measure output pressure of high pressure fuel pump. After that it points to DC diagnostics of MAF sensor & wiring to sensor . . .

I have noted that the high pressure fuel pump under the driver's seat has been making a high pitched squealing sort of sound intermittantly. It was making this noise today when I checked the car after my wife told me that the "Check Engine" light came on this morning.

I noted that the car is idling sort of rough.

The pinout diagram of the MAF sensor in the Volvo manual is not very illuminating as it does not show any circuit of the MAF sensor, though it's got to be pretty simple. I have an identical '94 960, so tonight I will compare the DC characteristics of the MAF sensors.

I also checked to see if there was fuel on the vacuum side of the Fuel Pressure Regulator and it was dry.

I'm inclined to think that the high pressure fuel pump may be the problem since this squealing has been going on intermittantly over a period of several months.

Any others out there have any experience/insights on this?






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.