| DETECTED CONDITION | POSSIBLE CAUSE | ||
| C15 | Output voltage is not within the following range. | ECT sensor circuit open or short ECT sensor malfunction | |
| P0115 | 0.15 V Sensor voltage < 4.85 V | ECM malfunction | |
| P0115 | H | Sensor voltage is higher than specified value. | ECT sensor circuit open or ground circuit open |
| L | Sensor voltage is lower than specified value. | ECT sensor circuit shorted to ground | |
Inspection
Step 1 (When indicating C15:)
- 1) Turn the ignition switch OFF.
- 2) Remove the right air cleaner box. (6-13)
- 3) Check the ECT sensor coupler for loose or poor contacts.
If OK, then measure the ECT sensor voltage at the wire side coupler.
- 4) Disconnect the coupler and turn the ignition switch ON.
- 5) Measure the voltage between B/Bl wire terminal A and ground.
- 6) If OK, then measure the voltage between B/Bl wire terminal A and B/Br wire terminal B.
- ECT sensor voltage: 4.5 - 5.5 V
- (+ B/Bl - − Ground)
- (+ B/Bl - − B/Br)
- 09900-25008: Multi-circuit tester set
- Tester knob indication: Voltage
Is the voltage OK?
| YES | Go to Step 2. |
| NO | Loose or poor contacts on the ECM coupler (terminal 10 or 29). Open or short circuit in the B/Bl wire or B/Br wire |
Step 1 (When indicating P0115-H:)
- 1) Turn the ignition switch OFF.
- 2) Remove the right air cleaner box. (6-13)
- 3) Check the ECT sensor coupler for loose or poor contacts. If OK, then check the ECT sensor lead wire continuity.
- 4) Disconnect the ECT sensor coupler and ECM coupler. (5-37)
- 5) Check the continuity between B/Bl wire А and terminal 10.
- 6) Also, check the continuity between B/Br wire B and terminal 29.
Caution: When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a needle pointed tester probe to prevent the terminal damage or terminal bend.
- ECTS lead wire continuity: Continuity (•)))
- 09900-25008: Multi-circuit tester set
- 09900-25009: Needle pointed probe set
- Tester knob indication: Continuity test (•)))
Is the continuity OK?
| YES | Go to Step 2. |
| NO | B/Bl or B/Br wire open |
- 7) After repairing the trouble, clear the DTC using SDS tool. (5-26)
Step 1 (When indicating P0115-L:)
- 1) Turn the ignition switch OFF.
- 2) Remove the right air cleaner box. (6-13)
- 3) Check the ECT sensor coupler for loose or poor contacts. If OK, then measure the output voltage.
- 4) Disconnect the ECT sensor coupler.
- 5) Check the continuity between B/Bl wire А and ground.
If the sound is not heard from the tester, the circuit condition is OK.
Tester knob indication: Continuity test (•)))
- 6) Connect the ECT sensor coupler and turn the ignition switch ON.
- 7) Measure the voltage between B/Bl wire А and ground.
- ECT sensor output voltage: 0.15 - 4.84 V
- (+ B/BI - − Ground)
- 09900-25008: Multi-circuit tester set
- 09900-25009: Needle pointed probe set
- Tester knob indication: Voltage
Are the continuity and voltage OK?
| YES | Go to Step 2. |
| NO | B/BI wire shorted to ground If wire is OK, go to Step 2. |
- 8) After repairing the trouble, clear the DTC using SDS tool. (5-26)
Step 2
- 1) Turn the ignition switch OFF.
- 2) Disconnect the ECT sensor coupler.
- 3) Measure the ECT sensor resistance.
ECT sensor resistance:
- Approx. 2.45 kΩ at 20°C (68°F) (Terminal - Terminal)
- 09900-25008: Multi-circuit tester set
- Tester knob indication: Resistance (Ω)
Refer to page 8-9 for details.
Is the resistance OK?
| YES | B/Bl or B/Br wire open or shorted to ground, or poor 10 or 29 connection. If wire and connection are OK, intermittent trouble or faulty ECM. Recheck each terminal and wire harness for open circuit and poor connection. Replace the ECM with a known good one, and inspect it again. |
| NO | Replace the ECT sensor with a new one. |
- 4) After repairing the trouble, clear the DTC using SDS tool. (5-26)
ECT sensor specification
| Engine Oil Temp | Resistance |
| 20°C (68°F) | Approx. 2.45 kΩ |
| 50°C (122°F) | Approx. 0.811 kΩ |
| 80°C (176°F) | Approx. 0.318 kΩ |
| 110°C (230°F) | Approx. 0.142 kΩ |