Hi Crewzin,
Did a search for "leak detection pump" in my repair manual:
An evaporation control system is connected to the
rollover valve(s)/control valve(Refer to 25 - EMISSIONS
CONTROL/EVAPORATIVE EMISSIONS/
ORVR - OPERATION) to reduce emissions of fuel
vapors into the atmosphere, when the tank is vented
due to vapor expansion in the tank. When fuel evaporates
from the fuel tank, vapors pass through vent
hoses or tubes to a charcoal canister where they are
temporarily held. When the engine is running, the
vapors are drawn into the intake manifold. In addition,
fuel vapors produced during vehicle refueling
are allowed to pass through the vent hoses/tubes to
the charcoal canister(s) for temporary storage (prior
to being drawn into the intake manifold). All models
are equipped with a self-diagnosing system using a
Leak Detection Pump (LDP) or Natural Vacuum
Leak Detection (NVLD). Refer to the Emission Control
System for additional information.
Also:
If the engine is shut-off while the On-Board diagnostics
test is running, low level tank pressure can
be trapped in the fuel tank and fuel can not be added
to the tank until the pressure is relieved. This is due
to the leak detection pump closing the vapor outlet
from the top of the tank and the one-way check valve
not allowing the tank to vent through the fill tube to
atmosphere. Therefore, when fuel is added, it will
back-up in the fill tube and shut off the dispensing
nozzle. The pressure can be eliminated in two ways:
1. Vehicle purge must be activated and for a long
enough period to eliminate the pressure. 2. Removing
the fuel cap and allowing enough time for the system
to vent thru the recirulation tube.
PT EVAPORATIVE EMISSIONS 25 - 15
NATURAL VAC LEAK DETECTION ASSY (Continued)
It also gives info about connection on one the harnesses (located near the fuel module?) These are pin out listings of the different connectors.:
C110 - BLACK (HEADLAMP AND DASH SIDE)
CAV CIRCUIT
1 G4 20DB
2 Z2 20BK/LG
3 A141 16DG/WT
4 Z1 16BK
5 K106 18WT/DG (LEAK DETECTION
PUMP)
6 K107 18OR/YL (LEAK DETECTION
PUMP)
7 -
8 -
9 -
10 -
C110 - BLACK (UNDERBODY SIDE)
CAV CIRCUIT
1 G4 20DB
2 Z2 20BK/LG
3 A141 16DG/WT
4 Z1 16BK
5 K106 20WT/DG (LEAK DETECTION
PUMP)
6 K107 20OR/YL (LEAK DETECTION
PUMP)
7 -
8 -
9 -
10 -
C111 (1.6L) - LT. GRAY (ENGINE SIDE)
CAV CIRCUIT
1 -
2 F12 20DB/WT
3 C3 20DB/BK
4 T40 14BR
5 A142 18DG/OR
6 K90 20TN
7 -
8 C21 20DB/OR
9 F20 18WT
10 L1 18VT/BK
11 L50 18WT/TN
12 A14 18GY/WT
13 -
14 -
PT 8W-
Mine is a 2004 so I dont know if any of this is applicable to your model. Hope this helps[:I]
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