P1234

D : FUEL PUMP CONTROL MODULE. P1234, P1236

D1 : CHECK THE POWER SUPPLY TO THE FUEL PUMP MODULE

1. Disconnect the fuel pump module electrical connector CA105.
2. Turn the ignition switch to the ON position.
3. Measure the voltage at CA105 pin 9 (NG)

Is the voltage greater than 10 volts?
Yes
Go to D2

No
REPAIR the circuit between electrical connector CA105 pin 9 (NG) and the ignition switch. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the central junction fuse box, ignition relay, and the inertia switch. For additional information, refer to wiring diagrams.

D2 : CHECK THE GROUND CIRCUIT TO THE FUEL PUMP MODULE

1. Measure the resistance between CA105 pin 2 (B) and ground.

Is the resistance less than 5 ohms?

Yes
Go to D3

No
REPAIR the circuit between electrical connector CA105 pin 2 (B) and GROUND. For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

D3 : CHECK THE SIGNAL GROUND CIRCUIT TO THE FUEL PUMP MODULE

NOTE: This test would be necessary if there were an EMC (Electro Magnetic Compatibility) issue with the vehicle.

1. Turn the ignition switch to the CRANK position.
2. Measure the resistance between electrical connector CA105 pin 4 (BG) and ground.

Is the resistance less than 5 ohms?

Yes
Go to D4

No
REPAIR the circuit between electrical connector CA105 pin 4 (BG) and GROUND. For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation. This circuit includes the PCM

D4 : CHECK THE POWER SUPPLY CIRCUIT TO THE FUEL PUMP

1. Reconnect the fuel pump module electrical connector CA105.
2. Disconnect the fuel pump electrical connector FT 2.
3. Turn the ignition switch to the ON position.
4. Measure the voltage between electrical connector FT2 pin 2 (R) and GROUND.

Is the voltage greater than 10 volts?
Yes
Go to D5

No
INSTALL a new fuel pump module. CLEAR the DTC. TEST the system for normal operation.

D5 : CHECK THE SIGNAL GROUND CIRCUIT FOR CONTINUITY

1. Disconnect the fuel pump module electrical connector CA105.
2. Measure the resistance between electrical connector CA105 pin 3 (Y) and electrical connector FT2 pin 4 (Y)

Is the resistance less than 5 ohms?
Yes
INSTALL a new fuel pump module. If the DTC is repeated, INSTALL a new fuel pump. CLEAR the DTC. TEST the system for normal operation.

No
REPAIR the circuit between electrical connector CA105 pin 3 (Y) and electrical connector FT2 pin 4 (Y). For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.