Dodge RAM TRUCK 1500 1995 Service Manual page 1140

14 -18 GENERAL DIAGNOSIS—EXCEPT DIESEL
Fig. 19 Coolant Temperature Sensor—3.91 ¥-6 or
5.2/5.9L ¥-8 Engines—Typical
Fig, 20 Coolant Temperature Sensor—8.0L ¥-10
Engine
(4) After tests are completed, connect electrical
connector to sensor. The sensor connector is symmet­
rical (not indexed). It can be installed to the sensor
in either direction.
TRANSMISSION TEMPERATURE 5ENS01 TEST
4-SPEED AUTOMATIC TRANSMISSIONS ONLY
To perform a complete test of this sensor and its
circuitry, refer to DRB scan tool and appropriate
Powertrain Diagnostics Procedures manual. To test
the sensor only, refer to the following:
The transmission temperature sensor is used on
models equipped with certain heavy-duty options and
a 4-speed automatic transmission. Its purpose is to
help control transmission overheating. If transmis­
sion overheating has been determined by this sensor,
an input is sent to the powertrain control module
(PCM). The PCM will then force a 4-3 downshift.
Once transmission temperature has cooled below
mm
SENSOR
RESISTANCE (ONMS)-ENGINE
GOOLANT,IMTAKE AIR AND TRANSMISSION
TEMPERATURE SENSORS
T E M P E R A T U R I RESISTANCE ( O H M S )
C F mm
M A X
- 4 0
-40
291,490 381,710
-20
- 4 85,850 108,390
-10 * 14 49,250 61,430
0 32 29,330 35,990
10 50 17,990 21,810
20 68 11,370 13,610
25 77 9,120 10,880
30 86 7,370 8,750
40 104 4,900 5,750
50 122 3,330 3,880
60 140 2,310 2,670
70 158 1,630 1,870
80 176 1,170 1,340
90 194 860 970
100
212 640 720
n o 230 480 540
120 248 370 410
J928D-4
specifications, a 3-4 upshift will be allowed. An in­
strument panel mounted transmission temperature
warning lamp (Fig. 21) is also used.
INSTRUMENT
Fig. 21 Transmission Temperature Warning
Lamp—Typical Location
This sensor is located in the transmission cooling
line on the side of the transmission (Fig. 22).
Test the resistance of the sensor with a high input
impedance (digital) volt-ohmmeter. The resistance (as
measured across the sensor terminals) should be less
than 1340 ohms with the engine and transmission
warm. Refer to the Sensor Resistance (OHMS)—En­
gine Coolant, Intake Air and Transmission Tempera-