Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
Resistance Measurement
When measuring the resistance with an ohmme-
ter , all values are given for a temperature of 20°C
(69°F). The value of a resistance varies with the
temperature. The resistance value for usual re-
sistor or windings (such as injectors) increases
as the temperature increases. However, our tem-
perature sensors are NTC types (Negative Tem-
perature Coefficient) and work the opposite which
means that the resistance value decreases as the
temperature increases. Take it into account when
measuring at temperatures different from 20°C
(69°F). Use this table for resistance variation rel-
ative to temperature for temperature sensors.
TEMPERATURE RESISTANCE (OHMS)
°C °F NOMINAL LOW HIGH
-30 -22 12600 11800 13400
-20
-4
11400 11000 11800
-10
14
9500 8000 11,000
0 32 5900 4900 6900
10 50 3800 3100 4500
20 68 2500 2200 2800
30 86 1700 1500 1900
40 104 1200 1080 1320
50 122 840 750 930
60 140 630 510 750
70 158 440 370 510
80 176 325 280 370
90 194 245 210 280
100 212 195 160 210
110 230
145
125 160
120 248
115
100 125
CONVERSION CHART FOR TEMPERATURE SENSORS
The res
istance value of a temperature sensor may
tes
t good at a certain temperature but it might be
d
efective at other temperatures. If in doubt, try a
new sensor.
Also remember this validates the operation of
the sensor at ambient temperature. It does not
validate the over temperature functionality. To
test it, the sensor could be removed from the
engine/muffler and heated with a heat gun while
it is still connected to the harness to see if the
ECM will detect the high temperature condition
and generate a fault code.
NOTE: In case of overheating, EGTS and CTS do
not generate fault codes. A message will be dis-
played on the information center, the beeper will
be activated and the EMS will be set in limp home
mode.
ENGINE CONNECTOR PIN-OUT
Connector Position
1
R1503motr166A
2
TYPICAL
1. ECM connector A
2. Engine connector
ECM Connector
Use this diagram to locate the terminal numbers
on the ECM connector A of the wiring harness
when performing tests.
R1503motr176A
1
13
28
41
29
14
ECM CONNECTOR PIN-OUT (WIRING HARNESS SIDE)
smr2004-Complete Line Up 405
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