Possible ECM Damage When Checking Fuel Pump Relay (NTB93-177)

WARNING: This page is about the Sentra E, 2D Sedan, Automatic, which is a different variant/trim than selected.

Publication date: 1993-11-29
Reference number: NTB93-177

POSSIBLE ECM DAMAGE WHEN CHECKING FUEL PUMP RELAY

TECHNICAL SERVICE BULLETIN

Reference Number(s): NTB93-177, Date of Issue: November 29, 1993

SENTRA FUEL PUMP RELAY CAUTION

Model(s): 1991-93 Nissan Sentra

Section: Engine Fuel

Classification: EF & EC93-017

Bulletin No.: NTB93-177

Date: November 29, 1993

SERVICE INFORMATION

When servicing a customer's vehicle with any fuel pump incident, exercise caution when diagnosing/checking at the fuel pump relay.

SERVICE PROCEDURE

Note that the schematic on the fuel pump relay is rotated 90 degrees from the orientation of the fuel pump relay terminals in connector E19 (see Fig 1 ).

Fig 1: Fuel Pump Relay & Fuel Pump Relay Schematic Connector E19

WARNING: Use caution to ensure that the correct terminals are being probed at connector E19 during diagnosing/checking.

NOTE: If terminals 2 or 3 (battery voltage) are connected to terminal 1 (ECM terminal), the ECM will become damaged, resulting in a no fuel pump operation (no ground from ECM on pin #104).