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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