EVAP System - MIL ON DTC P1447 Set

Reference:
ITB98-061

Classification:
EC98-029

Date:
January 1, 1999

1999 MY G20 MIL "ON" DTC P1447 (PURGE FLOW MONITOR) STORED

APPLIED VEHICLE: 1999 G20

SERVICE INFORMATION

If the 1999 G20 shows a MIL "ON" and DTC P1447 (Purge Flow Monitor) stored, use this bulletin to diagnose and repair the incident.

The cause for this incident is no detectable EVAP purge flow under normal purge conditions. The cause may be due to:

1. A blocked purge distribution hose (P/N 14912-7J102);
2. A vacuum leak due to hose disconnected and/or damaged between EVAP purge control solenoid valve and EVAP purge control valve.

SERVICE PROCEDURE

Blocked Purge Distribution Hose

Figure 1:

1. Remove the purge distribution hose and check for blockage (see Figure 1).

2. If purge distribution hose is blocked, replace hose.

Vacuum Leak Between EVAP Purge Control Solenoid Valve and EVAP Purge Control Valve

If the incident is not found to be caused by blockage in the purge distribution hose, check for a vacuum leak. This could be due either to a disconnected vacuum hose or damage to one of the hoses and/or a portion of the metal vacuum piping between the EVAP purge control solenoid valve and EVAP purge control valve. Perform the vacuum leak test using a hand held vacuum tester as follows:

Figure 2:

1. Disconnect the vacuum hose to the EVAP canister purge control valve at the EVAP canister purge control solenoid valve (lower hose shown in Figure 2). For ease of access, you may have to disconnect the upper hose also.

2. Connect the bottom hose to the hand held vacuum pump (see Figure 2) and apply vacuum.

A. If vacuum can be maintained and the purge distribution hose is not blocked, this bulletin does not apply. Refer to the Service Manual, diagnosis procedure for P1447.
B. If a vacuum cannot be maintained, continue to Step 3 and inspect for disconnected or damaged hose and/or metal vacuum piping.

Figure 3:

3. Check for disconnected vacuum hose between the EVAP canister purge control solenoid valve and EVAP canister purge control valve. Figure 3 shows the routing of the vacuum line between the EVAP purge control solenoid valve and EVAP purge control valve. This visual continuity check is best performed from beneath the vehicle.

Figure 4:

4. Ensure there are no excessive bends in the metal vacuum piping that would prevent proper insertion into the vacuum hoses (see Figure 4 for example).

5. Reconnect any disconnected sections found and/or correct excessive bends.

6. Visually inspect line (hoses and metal vacuum piping) for obvious splits and/or damage.

7. Replace damaged sections.

8. Reconnect all hoses.





PARTS INFORMATION

CLAIMS INFORMATION





Submit a Primary Failed Part (PP) line using the claims coding: