Based on information from various sensors, the ECM measures the fuel injection amount. The fuel injector is a solenoid-operated valve and the fuel injection amount is controlled by length of time the fuel injector is held open. The ECM controls each injector by grounding the control circuit. When the ECM energizes the injector by grounding the control circuit, the circuit voltage should be low (theoretically 0V) and the fuel is injected. When the ECM de-energizes the injector by opening the control circuit, the fuel injector is closed and circuit voltage should momentarily peak.
If the sensor input voltage is higher than the maximum threshold value during 0.14 sec under normal driving condition, ECM sets DTC P0223.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal check, high |
•
Poor connection
•
Open or short to battery in signal harness
•
Open in ground harness
•
TPS
•
ECM |
Enable Conditions |
•
IG "ON" | |
Threshold value |
•
The voltage of TPS > 4.883V | |
Diagnosis Time |
•
0.14 sec | |
MIL On Condition |
•
1 driving cycles |
Fig. 1) Normal waveform of TPS1 & TPS2 with no accel padal depressed under IG ON condition
