3.
Point ③ is where ECM makes FUEL PUMP ON when it detects starting RPM(50) with CKPS signal.
The ECM provides ground to one side of the coil in the fuel pump relay to control the fuel pump relay. The other side of the fuel pump relay coil is connected to fuel pump relay, which activates when the ignition switch is ON. The ECM monitors the control circuit between the fuel pump relay and the ECM. When the ignition switch is turned ON, the ECM energizes the fuel pump relay, which sends power to the fuel pump.
ECM sets DTC P0230 if the ECM detects that fuel pump relay control line is open or short to ground or battery line.
Item | Detecting Condition | Possible cause | |
Case1) | DTC Strategy | ● Signal check High | ● Open in power line ● Open in signal line ● Faulty fuel pump relay ● Faulty ECM |
Case2) | ● Signal check Low | ||
Case3) | ● Signal interruption | ||
Case4) | ● Rationality check | ||
Case1) | Threshold value | ● Short circuit to GND | |
Case2) | ● Short circuit to GND | ||
Case3) | ● Wire disconnection | ||
Case4) | |||
Case1) | Enable Conditions | ● Engine speed : > 40rpm / Ub : < 15.49V , > 6.34V | |
Case2) | ● Counter test pulse trigger : > 0 | ||
Case3) | |||
Case4) | |||
Diagnostic Time | ● Error counter = 3 , ≥ 0(100ms) | ||
MIL on condition |
Service standard
Ignition switch ON : ON 1.5 sec →OFF
Engine running : ON
This signal waveform shows how MAIN RELAY and FUEL PUMP operate each other.
Point ① is the duration ECM makes FUEL PUMP RELAY ON for 1.5 second after ignition switch ON.
Point ② is MAIN RELAY ON and its voltage should be over 12V.
Point ③ is where ECM makes FUEL PUMP ON when it detects starting RPM(50) with CKPS signal.
If the oprating sound of fuel pump relay is heard,when ignition key has been turned ON, the pump relay control system is considered normal.
In case DTC is displayed but FUEL PUMP RELAY is OK and no problem is found
The problem may be intermittent so slightly shake the connector and harness vertically and horizontally to check if there is any data changes
If the data changes normally, the problem was intermittent so erase DTC and verify the same DTC reoccure.
Go to "Terminal and Connector inspection" procedure.
In case there is symptom and wrong data with DTC
Check open,short or connector’s connection for RELAY
Check the deterioration of RELAY performance.
Go to "Signal circuit inspection" procedure.
This signal waveform shows how MAIN RELAY and FUEL PUMP operate each other.
Point ① is the duration ECM makes FUEL PUMP RELAY ON for 1.5 second after ignition switch ON.
Point ② is MAIN RELAY ON and its voltage should be over 12V.
Point ③ is where ECM makes FUEL PUMP ON when it detects starting RPM(50) with CKPS signal.
