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DTC 15

BHE070201038W14

DTC 15 | 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

Diagnostic Procedure

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