DTC 15


BHE070201038W14

DTC 15

ECT sensor system inspection

POSSIBLE CAUSE

• ECT malfunction
• Open or short circuit in wiring harness between A/C amplifier and ECT sensor

Diagnostic Procedure

STEP

INSPECTION

ACTION

1
• Inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION.)
• Is it normal?
Yes
Go to the next step.
No
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.)