Toronado V6-231 3.8L (1986)
Oil Pressure Gauge: All Technical Service Bulletins
Instruments - Oil Pressure Gage Erratic or Displays High
NUMBER:
92-T-27
CORP.REF.NO: 118303R
DATE:
January 1992
SECTION:
6
SUBJECT:
OIL PRESSURE GAGE ERRATIC OR DISPLAYS HIGH OIL PRESSURE - REPLACE OIL PRESSURE SENSOR
MODELS/YEARS:
1986-92 TORONADO
Some 1986-92 Toronados may exhibit a condition where the oil pressure gage may be erratic (needle fluctuates) or display very high oil pressures. This
is due to an internal intermittent contact within the oil pressure sensor.
To diagnose oil pressure gage complaints check the oil pressure with a mechanical gage using the oil pressure sensor hole in the engine block. The
reading you obtain is the measured oil pressure.
^
If the measured oil pressure is incorrect according to the engine specifications in Section 6, refer to that section for diagnosis and repair procedures
pertaining to high or erratic oil pressure.
^
If the measured oil pressure is correct according to the engine specifications in Section 6 of the Service Manual, enter service diagnostics and
monitor BCM data parameter BD71. BD71 is oil pressure in psi. BD71 will display a high value with an open or intermittent open sensor and a
low value if the BCM oil pressure sensor input is shorted to ground.
-
If the BD71 value is steady and agrees with the measured oil pressure, and the intermittent or high instrument panel cluster gage reading is still
present, refer to Section 8A-82 of the Service Manual for diagnosis of display conditions.
-
If the BD71 value is erratic or at maximum value, replace the oil pressure sensor with the appropriate part number listed below.
Model Year
Carline
P/N
1986-90
Toronado
3532954
1991-92
Toronado
25605389
Note:
On Toronado with analog (needle) cluster, an open sensor (fixed high BD71 parameter reading) will result in a high gage reading for a few
seconds followed by the needle dropping off to approximately zero to 20 psi. On all other clusters and under all other conditions, the cluster
display should agree with the BD71 parameter reading.
Parts are currently available from GMSPO.
