Dodge ram truck 3500 1996 Service Manual page 1360

1 4 - 1 2 8 FUEL SYSTEM
B R
P I & G I T O S I S AiND T E S T I N G (Continued)
THROTTLE POSITION SENSOR TEST
The throttle position sensor (TPS) is used on diesel
engines only when equipped with an automatic
transmission.
Refer to Throttle Position Sensor in the Component
Removal/Installation section. This will give adjust­
ment, testing and removal/installation procedures.
TRANSMISSION
TEMPERATURE
SENSOR
TEST
A U T O M A T I C T R A N S M I S S I O N
omiw
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:
(1) Disconnect the wire harness connector from the
temperature sensor. The sensor is located on the side
of the transmission in the transmission cooling line
(Fig.
29) .
TEMPERATURE S E N S O R J9414-46
Fig, 29 Transmission Temperature Sensor
Location—Typical
(2) Test the resistance of the sensor with an input
impedance (digital) volt-ohmmeter. The resistance (as
measured across the sensor terminals) should be less
than 1340 ohms with the engine warm. Refer to the
Sensor Resistance (OHMS)—Transmission Tempera­
ture Sensor resistance chart (Fig. 30). Replace the
sensor i f it is not within the range of resistance spec­
ified in the chart.
(3) Test the resistance of the wire harness. Do this
between the powertrain control module (PCM) wire
harness connector terminal B - l and the sensor con­
nector terminal. Also check between PCM terminal
A-4 to the sensor connector terminal. Repair the
wire harness as necessary i f the resistance is greater
than 1 ohm.
T E M P E R A T U R E R E S I S T A N C E
(OHMS)
C F mm MAX
- 4 0 291,490 381,710
-20
- 4 85,850
108,390
- 1 0 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
Fig. 30 SENSOR RESISTANCE (OHMS)—
TRANSMISSION TEMPERATURE SENSOR
VEHICLE SPEED SENSOR
To perform a complete test of the sensor and its
circuitry, refer to DRB scan tool and appropriate
Powertrain Diagnostics Procedures manual.
R E M O V A L A N E I N S T A L L A T I O N
AUTOMATIC SHUTDOWN (ASD) RELAY
The ASD relay is located in the Power Distribution
Center (PDC) (Fig. 31). Refer to label on PDC cover
for relay location. Check terminal connections at
PDC and relay for damage/corrosion before installa­
tion. Repair as necessary.
Fig. 31 Power Distribution Center (PDC)