Section 06
ENGINE MANAGEMENT (RFI)
Subsection 04
(COMPONENT INSPECTION)
06-04-2
SMR2003-022_06_04A.FM
Pay particular attention to ensure that pins are not
out of their connectors or out of shape. The trou-
bleshooting procedures cover problems not re-
sulting from one of these causes.
Before replacing a MPEM, always check electrical
connections. Make sure that they are very tight and
they make good contact and that they are corrosion-
free. A “defective module” could possibly be re-
paired simply by unplugging and replugging the
MPEM. The voltage and current might be too
weak to go through dirty wire pins. Check carefully
if posts show signs of moisture, corrosion or if
they look dull. Clean pins properly and then coat
them with silicon-based dielectric grease or other
appropriate lubricant (except if otherwise speci-
fied) when reassembling them. If the newly re-
placed MPEM is working, try the old one and re-
check if it works.
Ensure that all electronic components are genuine
— particularly in the ignition system. Installing re-
sistive caps, non-resistive spark plug cables (or
modified length) or non-resistive spark plugs may
lead to generate fault codes or bad operation.
NOTE:
Use the VCK to diagnose fault codes. See
TOUBLESHOOTING section.
After a problem has been solved, ensure to clear
the fault(s) in the MPEM using the VCK. Refer to
DIAGNOSTIC PROCEDURES.
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.
WARNING
Ensure all terminals are properly crimped on
wires and connector housings are properly
fastened.
TEMPERATURE
RESISTANCE (ohms)
°C
°F
NOMINAL
LOW
HIGH
- 30
- 22
12600
11800
13400
- 20
- 4
11400
11000
11800
- 10
14
9500
8000
11000
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
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