G 2500 3/4 Ton Van V6-262 4.3L (1986)
Canister Purge Control Valve: Technical Service Bulletins
Fuel Evap Purge Solenoid Valve - Inoperative
NUMBER:
86-B-102
GROUP:
6E - Emission Controls
DATE:
July, 1986
SUBJECT:
SHORTED OUT ELECTRIC CANISTER PURGE SOLENOID VALVE AND A FALSE CODE 54
MODELS:
1985-86 G VANS WITH 4.3L, 5.0L, 5.7L ENGINES AND NB2 CALIFORNIA EMISSIONS
FIGURE 1 - ELECTRIC PURGE SOLENOID VALVE
Some 1985, 86 G Vans with NB2 California emissions may experience a shorted out electric purge solenoid valve (see Figure No. 1). This condition
may be caused by moisture entering tile electrical portion of the canister purge solenoid valve and setting a false Code 54.
If this condition is encountered and the inspection of the solenoid indicates that replacement of the solenoid is required, replace the purge solenoid valve
and install a new moisture shield, P/N 14066503, which has been released to correct this condition. The electronic control module (ECM) may also have
a failed quad driver in the mixture control solenoid (M/C) circuit and the ECM should be checked to make sure it was not damaged if the purge solenoid
valve is shorted out. If the ECM is damaged, it also must be replaced. Removal and installation procedures for the electric canister purge solenoid valve
and the ECM are in Section 6E8, Emissions, of the Light Duty Service Manual. Before the new moisture shield can be installed, modifications to the
purge solenoid valve bracket and moisture shield must be completed.
