EVAP System - MIL ON/Multiple DTC's Set
Classification:EC97-017b
Reference:
NTB97-074b
Date:
Jul 18, 2000
1996-97 TRUCK MIL "ON" WITH EVAPORATIVE EMISSION
SYSTEM DTC(S) STORED
This amended version of NTB97-074a provides revised part number information for the EVAP vent control valves and EVAP canisters. Please refer to this bulletin (NTB97-074b) for complete information.
APPLIED VEHICLE:
1996-97 Truck (D21)
APPLIED VINS:
Vehicles built before 1N6SD11S9VC389078
SERVICE INFORMATION
If a 1996-97 Truck has a MIL "ON" and one or more of the DTCs listed below are stored in self diagnosis, water contamination within the evaporative emission system may be the cause of this condition.
^ P0440 (EVAP Small Leak)
^ P0443 (EVAP Purge Control Valve & Solenoid Valve)
^ P0446 (EVAP Canister Vent Control Valve)
^ P0450 (EVAP Pressure Sensor)
^ P1445 (EVAP Purge Volume Control Valve)
To correct this incident, should it occur:
A) Install a water separator to the evaporative emission system to prevent water entry.
B) Determine the cause of the stored DTC(s) and repair the vehicle accordingly.
Instructions for water separator installation as well as repair diagnostics are included in this bulletin. For additional information regarding the diagnosis and repair of the stored DTC causes, refer to the appropriate section of the applicable service manual.
Parts Removal
1. Remove the spare tire.
2. Remove the hose between the EVAP canister vent control valve and the frame member (see Figure 1). Discard the plastic connector elbow and hose (largest diameter hose).
3. Remove the EVAP canister from the vehicle.
EVAP Canister Vent Control Valve Inspection
1. Remove the vent control valve from the EVAP canister.
2. Apply battery voltage to the valve and make sure the air passage closes (see Figure 2).
NOTE:
The valve must function (click) on the first application of battery voltage.
3. Disconnect the battery voltage and make sure the air passage opens again (valve does not stick closed).
4. Look inside the valve air passage and make sure there is no corrosion or rust on the metal shaft.
If the valve fails any of these tests, install one of the EVAP vent control valves listed below. Use a new 0-ring (P/N 16618-40U00) when replacing the Type-A valve.
^ Type-A* EVAP vent control valve without integral 0-ring P/N 14935-54U06 (to be used with Type-A EVAP canister P/N 14950-1S717)
^ Type-B* EVAP vent control valve with integral 0-ring P/N 14935-54U04 (to be used with Type-B EVAP canister P/N 14950-1S718)
* Refer to NTB98-019a for detail information about the differences between Type-A and Type-B EVAP vent control valves and canisters.
EVAP Canister Inspection
1. Make sure that no liquid drains from the EVAP canister.
2. Weigh the EVAP canister (with vent control valve) and confirm that the weight is less than 4 pounds (1.8 kg).
If liquid drains from the canister or if the weight is over 4 lbs. (1.8 kg), install one of the EVAP canisters listed below. Use a new 0-ring (P/N 16618-40U00) when replacing the Type-A canister.
^ Type-A EVAP canister P/N 14950-1S717 (to be used with Type-A vent control valve P/N 14935-54U06)
^ Type-B* EVAP canister P/N 14950-1S718 (to be used with Type-B vent control valve P/N 14935-54U04)
* Refer to NTB98-019a for detail information about the differences between Type-A and Type-B EVAP canisters and vent control valves.
NOTE:
Do not reinstall the EVAP canister at this time.
Water Separator Kit Installation
1. Assemble the 2 hoses supplied in the kit onto the water separator (see Figure 3).
2. Inspect the plastic connector elbow contained in the water separator kit (see Figure 3).
a. If the plastic connector elbow has an integral mesh (screen) over the opening of the elbow as shown in Figure 4, insert this elbow into the end of the shorter kit supplied hose (see Figure 3).
b. If the plastic connector elbow does not have an integral mesh (screen) over the opening of the elbow or it the water separator kit does not contain a plastic connector elbow, order the plastic connector elbow specified under "Parts Information" in this bulletin. Insert this elbow into the end of the shorter kit supplied hose (see Figure 3).
3. Drill a 5.5 mm (7/32 inch) hole in the vehicle right rear frame rail (lower side). The location of the hole is 205 mm (8 inches) from the end of the frame rail (where the rear bumper attaches) and centered side-to-side (see Figure 5). NOTE: After drilling, apply a protective coating to the hole (Tectyl(R) 517 Bitumen Wax # 999MP-9G001 or equivalent).
4. Install the water separator (with hoses) to the frame rail using the kit supplied self tapping screw (see Figure 5).
5. Install the short hose (with the plastic connector elbow on the end) in the frame member hole that the original hose was removed from (see Figure 5).
6. Reinstall the EVAP canister (with vent control valve) to the vehicle.
7. Reconnect the 2 smaller diameter hoses to the EVAP canister using new clamps that are supplied in the kit. Connect the kit supplied larger diameter hose (from the water separator) to the EVAP canister vent control valve (no clamp is required).
8. Reconnect the EVAP vent control valve electrical harness.
9. Reinstall the spare tire.
PARTS INFORMATION
CLAIMS INFORMATION
Submit a Primary Failed Part (PP) line using the claims coding.