DTC 15
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ECT sensor system inspection
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POSSIBLE CAUSE |
• ECT malfunction
• Open or short circuit in wiring harness between A/C amplifier and ECT sensor
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Diagnostic Procedure
STEP
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INSPECTION
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ACTION
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1
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• Inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION.)
• Is it normal?
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Yes
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Go to the next step.
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No
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Replace the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION.)
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2
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• Disconnect the A/C amplifier connector (16-pin) and the PCM connector (31-pin).
• Is there an open circuit in the wiring harness between A/C amplifier connector (16-pin) terminal 2M and PCM connector terminal 5W?
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Yes
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Repair the wiring harness.
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No
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Go to the next step.
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3
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• Is there an open circuit in the wiring harness between ECT sensor connector terminal A and PCM connector terminal 2K?
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Yes
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Repair the wiring harness.
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No
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Go to the next step.
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4
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• Disconnect the PCM connector (28-pin).
• Is there an open circuit in the wiring harness between PCM connector (28-pin) terminal 2K and ECT sensor connector terminal A?
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Yes
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Repair the wiring harness.
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No
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Go to the next step.
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5
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• Is there a short circuit to ground in the wiring harness between A/C amplifier connector (16-pin) terminal 2M and PCM connector terminal 5W?
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Yes
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Repair the wiring harness.
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No
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Connect the A/C amplifier connector (16-pin), ECT sensor connector, and the PCM connectors, then go to the next step.
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6
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• Is there a short circuit to ground in the wiring harness between PCM connector (28-pin) terminal 2Q and ECT sensor connector terminal B?
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Yes
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Repair the wiring harness.
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No
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The system is normal at present. (Clear the past malfunction from memory.)
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