On Board Diagnostics II PCED

1999 PCED On Board Diagnostics II

SECTION 5: Pinpoint Tests

HX: Evaporative Emission (EVAP) Monitor and System
Introduction

Note

Enter this Pinpoint Test only when directed here.

The use of a soap solution, such as SNOOP, around the fuel filler cap or the use of the hydrocarbon emission analyzer to determine an evaporative emission system leak is not recommended. The mandatory Rotunda Evaporative Emission System Leak Tester for OBD II (including the ultra-sonic tester) is the only device to be used at this time for evaporative emission system leak detection.

This Pinpoint Test is intended to diagnose the following:

Canister vent (CV) solenoid (9F945) (electrical concern only)
Fuel filler cap (9030)
Fuel tank pressure (FTP) sensor (9C052)
In-line fuel tank pressure (FTP) sensor (9C052)
EVAP canister tube (fuel tank to EVAP canister) (9A228)
Front fuel vapor hose assembly (fuel tank to EVAP canister) (9K313)
Fuel canister purge outlet tube (EVAP canister to EVAP canister purge valve) (9D661)
EVAP return tube (EVAP canister purge valve to intake manifold) (9G271)
EVAP canister purge valve (9C915)
Vacuum source line (input port vacuum to intake manifold)
Harness circuits: CV, FLI, FTP, EVAP Canister Purge Valve, SIG RTN, vehicle power (VPWR), reference voltage (VREF) and power ground (PWR GND)
Powertrain control module (PCM) (12A650)

This Pinpoint Test is used as an assistance in diagnosing the following EVAP components:

EVAP canister and bracket assembly (9E857)

EVAP canister sleeve assembly (fitting) (9D925)
Canister vent (CV) solenoid - hose assembly (9F976 or 9K318)
EVAP canister (9D653)
Canister vent (CV) solenoid - (9F945)(mechanical concern only)

Fill limit valve assembly (9A086)
Fuel filler pipe flapper valve (9B085)
Fuel filler pipe check valve (9189), assembly (9285)
Fuel tank filler pipe (9034)
Fuel tank assembly (with fuel vapor vent valve) (9K007)
Fuel tank assembly (without fuel vapor vent valve) (9002)
Fuel vapor control valve (9B190) [can be referred to as a grade vent valve (GVV)]
Fuel vapor vent valve (9B593) [can be referred to as a fill limiting vent valve (FVV)]
Fuel vapor separator assembly (9B328) [can be referred to as a dust separator]
Liquid/vapor fuel discriminator (9G332)
On-board refueling vapor recovery (ORVR) T - connector assembly (9S314)