P1338

DTC P1338: FUEL PUMP FEEDBACK CIRCUITS

G92396t28: CHECK SIGNAL POWER CIRCUIT TO FUEL PUMP MODULE
1. Disconnect fuel pump module electrical connector CA105.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between electrical connector CA105 pin 9 (NG) and GROUND.

- Is the voltage greater than 10 volts?

-> Yes
GO to Pinpoint Test G92396t29.

-> No
GO to Pinpoint Test G92396t31.

G92396t29: CHECK FEEDBACK CIRCUIT TO FUEL PUMP MODULE
1. Reconnect fuel pump module electrical connector CA105.
2. Turn the ignition switch to the CRANK position.
3. Measure the voltage between ECM electrical connector EN16 pin 25 (W) and GROUND.

- Is the voltage greater than 4 volts?

-> Yes
No electrical fault in circuit. Recheck DTCs.

-> No
GO to Pinpoint Test G92396t30.

G92396t30: CHECK FEEDBACK CIRCUIT FOR CONTINUITY
1. Disconnect fuel pump module electrical connector CA105.
2. Disconnect ECM electrical connector EN16.
3. Measure the resistance between electrical connector CA105 pin 7 (W) and electrical connector EN16 pin 25 (W).

- Is the resistance less than 5 ohms?

-> Yes
GO to Pinpoint Test G92396t31.

-> No
REPAIR the circuit between electrical connector CA105 pin 7 (W) and electrical connector EN16 pin 25 (W). For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

G92396t31: CHECK CONTROL CIRCUIT FOR CONTINUITY
1. Measure the resistance between electrical connector CA105 pin 1 (N) and electrical connector EN16 pin 27 (N).

- Is the resistance less than 5 ohms?

-> Yes
INSTALL a new fuel pump module. CLEAR the DTC. TEST the system for normal operation. If the DTC is repeated, INSTALL a new ECM. Before replacing a ECM, contact Dealer technical support.

-> No
REPAIR the circuit between electrical connector CA105 pin 1 (N) and electrical connector EN16 pin 27 (N). For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.