Sentra Sedan L4-1597cc 1.6L SOHC (E16S) (1986)
Electronic Carburetor Control (ECC) Unit: Technical Service Bulletins
ECM - Green or Blue Relay Caution
Date: July 5, 1995
GREEN OR BLUE (FUEL PUMP & A/C) RELAY CAUTION
When servicing a customer's vehicle, exercise caution when diagnosing / checking the harness at any green or blue colored relay (Fuel pump & A/C)
When diagnosing the harness at any green or blue colored relay (Fuel pump & A/C) connector, observe the following pre-cautions to prevent damage to
the Engine Control Module (ECM):
Note that the schematic on the relay is different than the orientation of the relay terminals in the harness connectors (see diagram):
Exercise caution to ensure that the correct terminals are being probed at the relay connector during diagnosing / checking.
Use a circuit tester first to verify the terminals that are supplied with battery voltage. If battery voltage is connected to terminal 2, the ECM will be
damaged if the circuit being tested has terminal 2 connected to the ECM.