Monitor Description
The diagnostics system monitors the E.F.I. water temperature sensor functional checks. After the engine is started, if the engine coolant temperature does not reach to the range required for the closed loop air/fuel ratio control within the specified time period, the diagnostics system judges that there is a malfunction in the E.F.I. water temperature sensor and stores the DTC.
MONITOR STRATEGY
| Related DTCs | P0125: Engine coolant temperature sensor range check |
| Required Sensors/Components (Main) | E.F.I. water temperature sensor, thermostat, cooling system |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Once per driving cycle |
| Duration | 120 seconds: Closed loop temperature -10°C {14°F} 300 seconds: Closed loop -10 to 20°C {14 to 68°F} |
| MIL Operation | 2 operation cycle |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| Overlap prohibited DTC | P0117, P0118 (engine coolant temperature (ECT) sensor) P0122, P0123, P0222, P0223 (Throttle position sensor) P0300, P0301, P0302, P0303, P0304 (misfire) P0500 (Vehicle Speed Sensor (VSS)) P0604, P0605 (ECM ROM) P1160 (throttle return spring) P2101, P2102 (Throttle actuator control motor) P2109 (Throttle position sensor minimum stop) P2119 (Throttle actuator control) P2122, P2123, P2127, P2128 (Accelerator Pedal Position Sensor (APPS) circuit) P2135 (Throttle position sensor (TPS) degree of correlation) P2138 (Accelerator pedal position sensor (APPS) degree of correlation) |
| Battery Voltage | 10.9V or more |
| Engine Speed | 500 RPM or more |
Diagnostic timer
64 ms + (0 to 185.3) ms (varies depending on vehicle speed, lowest engine coolant temperature and idle switch status) |
[390574 - (20900 x lowest engine coolant temperature)] or more |
TYPICAL MALFUNCTION THRESHOLDS
| Engine coolant temperature | Less than 20°C {68°F} |