Section 06
ENGINE MANAGEMENT (DI)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
SMR2002-075 _06-03A.FM
06-03-3
Resistance Measurement
When measuring the resistance with an ohmmeter,
all values are given for a temperature of 20°C
(69°F). The resistance value of a resistance varies
with the temperature. The resistance value for
usual resistor or windings (such as injectors)
in-
creases
as the temperature increases. However,
our temperature sensors are NTC types (Negative
Temperature 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
relative to temperature for
temperature
sensors.
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 vali-
date 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 MPEM will
detect the high temperature condition and gener-
ate a fault code.
When working with injectors, the resistance value
might test good while the complete current would
not flow through the wire when pulsating current
is supplied to the injector in its normal operation.
A solution would be to use a jumper wire to direct-
ly supply the injector from the MPEM. If it now
works, replace the defective wire. A Noid light
(available from after-market tool/equipment sup-
pliers) may also be used to validate the injector
operation.
AMP CONNECTOR PIN-OUT
Use this diagram to locate the pin numbers on the
AMP connector no. 3 and no. 4 of the wiring har-
ness when performing tests.
AMP CONNECTOR PIN-OUT (WIRING HARNESS SIDE)
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
F07F15A
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Содержание GTX 4-TEC 5573 2002
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