P1115
Diagnostic Chart:
Diagnostic Chart (cont'd):
Electrical Diagram:
CIRCUIT DESCRIPTION
The Engine Coolant Temperature (ECT) sensor is a thermistor mounted in the engine coolant stream. The PCM applies a voltage (about 5.0 volts) through a pull up resistor to the ECT signal circuit. When the engine coolant is cold, the sensor (thermistor) resistance is high, therefore the PCM will measure a high signal voltage. As the engine coolant warms, the sensor resistance becomes less, and the ECT signal voltage measured at the PCM drops. With a fully warmed up engine, the ECT signal voltage should measure about 1.5-2.0 volts. If the PCM detects an ECT signal that is intermittently above the range of the ECT sensor, DTC P1115 will set.
CONDITIONS FOR SETTING THE DTC
- Engine run time longer than 3 seconds
- The ECT sensor signal is intermittently greater than 4.8 volts.
- Above conditions present for longer than 5 seconds.
ACTION TAKEN WHEN THE DTC SETS
- The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
- The PCM will store conditions which were present when the DTC set as Fail Records data only. This information will not be stored as Freeze Frame data.
CONDITIONS FOR CLEARING THE MIL/DTC
- A history DTC will clear after 40 consecutive warm-up cycles have occurred without a fault.
- DTC can be cleared by using the scan tool Clear Info function, or by disconnecting the PCM battery feed.
DIAGNOSTIC AIDS
Check for the following conditions:
- Poor connection at PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor, terminal to wire connection.
- Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the ECT display on the scan tool while moving connectors and wiring harnesses related to the ECT sensor. A change in the ECT display will indicate the location of the fault.
Review the Fail Records vehicle mileage since the diagnostic test last failed. This may help determine how often the condition that caused the DTC to be set occurs.