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Section 04 ENGINE MANAGEMENT (1503 4-TEC)
Subsection 03 (COMPONENT INSPECTION, REPLACEMENT AND ADJUSTMENT)
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 resistance value of a temperature sensor may
test good at a certain temperature but it might be
defective 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.
ECM Connectors
The most recommended and safest method to
probe ECM connector terminals is to use the
ECM adapter (P/N 420 277 010). This tool will
prevent deforming or enlarging terminals which
would lead to bad ECM terminal contact creating
intermittent or permanent problems.
420277010
Disconnect the desired connector from ECM and
reconnect on the tool connector. Probe required
terminals directly in the tool holes.
A35C3UA
CAUTION:
If not using the ECM adapter, probe
on top of terminal only. Do not try to probe in-
side terminal or to use a paper clip to probe in-
side terminal, it will damage the square-shaped
terminal and this could lead to improper func-
tion of the engine management system.
110
smr2005-013
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