P1236

D : Fuel Pump Not Activated When Requested By PCM: P1236

D1 : CHECK THE POWER SUPPLY TO THE REM
1. Disconnect the REM electrical connector, CA103.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between CA103, pin 001 (GR) and GROUND.

Is the voltage greater than 10 volts?

Yes
Goto D2

No
REPAIR the supply circuit to the REM. This circuit includes the rear power distribution box, fuse 47, the fuel pump relay, and fuse 23. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

D2 : CHECK THE REM + OUTPUT TO THE FUEL PUMP
1. Reconnect CA103.
2. Disconnect the fuel pump electrical connector, FP004.
3. Turn the ignition switch to the CRANK position.
4. Measure the voltage between FP004, pin 002 (R) and GROUND.

Is the voltage greater than 10 volts?

Yes
Goto D4

No
Goto D3

D3 : CHECK THE REM - OUTPUT TO THE FUEL PUMP
1. Turn the ignition switch to the CRANK position.
2. Measure the resistance between FP004, pin 004 (B) and GROUND.

Is the resistance less than 10 ohms?

Yes
INSTALL a new fuel pump. CLEAR the DTC. TEST the system for normal operation.

No
Goto D4

D4 : CHECK THE PCM OUTPUT WIRE TO THE REM FOR CONTINUITY
1. Disconnect the battery negative terminal.
2. Disconnect the REM electrical connector, CA103.
3. Disconnect the PCM electrical connector, PI001.
4. Measure the resistance between PI001, pin 027 (WR) and CA103, pin 019 (WR)

Is the resistance less than 5 ohms?

Yes
INSTALL a new REM. CLEAR the DTC. TEST the system for normal operation. If the DTC is repeated, INSTALL a new PCM.

No
REPAIR the circuit between the PCM and the REM. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.