RESISTANCE INSPECTION
1. Remove the battery cover.
2. Disconnect the negative battery cable. (See
BATTERY REMOVAL/INSTALLATION [LF]
.)
3. Disconnect the ECT sensor connector.
4. Remove the ECT sensor. (See
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
REMOVAL/INSTALLATION [LF]
.)
5. Place the ECT sensor in the water and while increasing the water temperature, measure the resistance
between ECT sensor terminals A and B.
If the monitor item status/specification (reference) is not within the specification, even though the
ECT sensor resistance is within the specification, perform the
CIRCUIT OPEN/SHORT
INSPECTION
.
If not within the specification, replace the ECT sensor. (See
ENGINE COOLANT
TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [LF]
)
STANDARD ECT SENSOR RESISTANCE SPECIFICATION
CIRCUIT OPEN/SHORT INSPECTION
1. Disconnect the PCM connector. (See
PCM REMOVAL/INSTALLATION [LF]
.)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
NOTE:
Before performing the following inspection, make sure to follow the
procedure as indicated in the troubleshooting flow diagram. (See
TROUBLESHOOTING PROCEDURE .)
Water temperature (°C {°F})
Resistance (kilohm)
20 {68}
35.48-39.20
80 {176}
3.65-4.02
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Engine Control System - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:41:10 PM
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© 2005 Mitchell Repair Information Company, LLC.