Dodge RAM TRUCK 1500 1995 Service Manual page 1197

B R
TEMPERATURE SENSOR J9414-46
Fig. 36 Transmission Temperature Sensor
Location—Typical
SENSOR RESISTANCE (OHMS)—
TRANSMISSION TEMPERATURE SENSOR
T E M P E R A T U R E
RES6STANCE ( O H M S )
C
F M I N
mm
- 4 0 291,490
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
no
230 480 540
120 248 370 410
J928D-4
VEHICLE SPEED SENSOR TEST
To perform a complete test of the sensor and its cir­
cuitry, refer to DRB scan tool and appropriate Pow­
ertrain Diagnostics Procedures manual.
WATER-IN-FUEL WARNING LAMP
If this warning lamp remains illuminated when the
ignition key is ON, it indicates that excess water has
collected in the fuel filter/water separator. (Note that
the lamp will be illuminated for approximately two
seconds when the ignition key is initially placed in"
the ON position for a bulb check). Excess water can
be drained. Refer to Fuel Filter/Water Separator in
GENERAL DIAGNOSIS—DIESEL ENGINE 14 -115
the Diesel Engine—Component Removal/Installation
section of this group for water draining procedures.
0N-B0ARD DIAGNOSTICS (OBD)—DIESEL
POWERED VEHICLES
The powertrain control module (PCM) has been
programmed to monitor many different circuits for
diesel powered vehicles. If a problem is sensed in a
monitored circuit often enough to indicate an actual
problem, a diagnostic trouble code (DTC) is stored.
The DTC will be stored in the PCM memory for even­
tual display to the service technician. If the problem
is repaired or ceases to exist, the PCM cancels the
DTC after 51 engine starts.
Certain criteria must be met for a diagnostic trou­
ble code (DTC) to be entered into PCM memory. The
criteria may be a specific range of engine rpm, engine
temperature and/or input voltage to the PCM.
It is possible that a DTC for a monitored circuit
may not be entered into memory even though a mal­
function has occurred. This may happen because one
of the DTC criteria for the circuit has not been met.
A DTC indicates that the powertrain control mod­
ule (PCM) has recognized an abnormal signal in a
circuit or the system. A DTC may indicate the result
of a failure, but never identify the failed component
directly.
There are several operating conditions that the
PCM does not monitor and set a DTC for. Refer to
the following Monitored Circuits and Non-Monitored
Circuits in this section.
MONITORED CIRCUITS
The powertrain control module (PCM) can detect
certain problems in the electrical system.
Open or Shorted Circuit - The PCM can deter­
mine if sensor output (which is the input to PCM) is
within proper range. It also determines if the circuit
is open or shorted.
Output Device Current Flow - The PCM senses
whether the output devices are hooked up.
If there is a problem with the circuit, the PCM
senses whether the circuit is open, shorted to ground
(-), or shorted to (+) voltage.
NON-MONITORED CIRCUITS
The PCM does not monitor the following circuits,
systems or conditions that could have malfunctions
that result in driveability problems. A diagnostic
trouble code (DTC) will not be displayed for these
conditions.
Fuel Pressure: Fuel pressure is controlled by the
fuel transfer pump and fuel injection pump. The
PCM cannot detect problems in these components.
Cylinder Compression: The PCM cannot detect
uneven, low, or high engine cylinder compression.
Exhaust System: The PCM cannot detect a
plugged, restricted or leaking exhaust system.