Code 16/Mil - EVP/EGR Assembly Testing (88-25-12)

Publication date: 1988-12-08
Reference number: 88-25-12

CODE 16/MIL - EVP/EGR ASSEMBLY TESTING

TECHNICAL SERVICE BULLETIN

Reference Number(s): 88-25-12, Date of Issue: 12/8/88

CONDITIONS

ELECTRONIC ENGINE CONTROL (EEC) - SELF TEST CODE "16" - CALIFORNIA EMISSION VEHICLES ONLY

LIGHT - CHECK ENGINE (MIL) - SELF TEST CODE "16" - CALIFORNIA EMISSION VEHICLES ONLY

APPLICATION

Model(s): FORD 1988-89 FESTIVA

Buelletin No.: 88-25-12

Date: 12/8/88

ISSUE

A "check engine" light (MIL) that intermittently flashes "on" and "off" or stays "on" may be caused by the EVP sensor. Service code "16" will be displayed during EEC Self Test.

ACTION

Perform and EEC Self Test to determine if service code "16" is present. If service code "16" is present, refer to the following service procedure.

Install a breakout box.
Measure the EVP signal voltage from the EVP sensor to the processor (ECA). Measure between pin 27 and 46 on the breakout box.
NOTE: IF A BREAKOUT BOX IS NOT AVAILABLE, THE SIGNAL VOLTAGE CAN BE MEASURED BETWEEN THE "BLACK" AND "GREEN" WIRES AT THE EVP SENSOR. THE WIRE HARNESS MUST BE CONNECTED AND THE ENGINE MUST BE AT A HOT CURB IDLE.
If the voltage signal is above 0.95 volts, install a new EGR/EVP assembly, (E8BZ-9D475-A).

PARTS INFORMATION

PART NUMBER	PART NAME	CLASS
E8BZ-9D475-A	EVP/EGR Assembly	W