(P0446) Charcoal Canister Shutoff Valve

(P0446) CHARCOAL CANISTER SHUTOFF VALVE






When Monitored and Set Condition
^ When Monitored: The ignition on or engine running. Battery voltage greater than 10 volts.
^ Set Condition:

POSSIBLE CAUSES
OPEN FUSED ENGINE CONTROL RELAY OUTPUT CIRCUIT
CHARCOAL CANISTER SHUTOFF VALVE CONTROL CIRCUIT SHORT TO GROUND
CHARCOAL CANISTER SHUTOFF VALVE CONTROL CIRCUIT OPEN
CHARCOAL CANISTER SHUTOFF VALVE CONTROL CIRCUIT SHORT TO VOLTAGE
CHARCOAL CANISTER SHUTOFF VALVE
POWERTRAIN CONTROL MODULE

Diagnostic Test
1. CHARCOAL CANISTER SHUTOFF VALVE





Turn the ignition off.
Disconnect the Charcoal Canister Shutoff Valve harness connector.

Note: Check connectors-Clean/repair as necessary.

Turn the ignition on.
Using a 12-volt test light, jumper across the Charcoal Canister Shutoff Valve harness connector.
Does the test light illuminate?
Yes>> Replace the Charcoal Canister Shutoff Valve.
Perform Powertrain Verification Test - Ver 2
No>> Go To 2

2. CHECKING THE FUSED ENGINE CONTROL RELAY OUTPUT CIRCUIT TO THE CHARCOAL CANISTER SHUTOFF VALVE





With the ignition on.
Connect a 12-volt test light between ground and the Fused Engine Control
Relay Output circuit and a ground of the Charcoal Canister Shutoff Valve harness connector.
Does the test illuminate brightly?
Yes>> Go To 3
No>> Repair the Fused Engine Control Relay Output circuit for an open.
Perform Powertrain Verification Test - Ver 2

3. CHECKING THE CHARCOAL CANISTER SHUTOFF VALVE CONTROL CIRCUIT FOR AN OPEN





Turn the ignition off.
Disconnect the PCM C4 harness connectors.

Note: Check connectors-Clean/repair as necessary. Measure the resistance of the Charcoal Canister Shutoff Valve Control circuit from the Charcoal Canister Shutoff Valve harness connector to the PCM C4 harness connector.

Is the resistance below 5.0 ohms?
Yes>> Go To 4
No>> Repair the Charcoal Canister Shutoff Valve Control circuit for an open.
Perform Powertrain Verification Test - Ver 2

4. CHARCOAL CANISTER SHUTOFF VALVE CONTROL CIRCUIT SHORT TO GROUND.





With the ignition off.
Measure the resistance between ground and the Charcoal Canister Shutoff Valve Control circuit at the Charcoal Canister Shutoff Valve harness connector.
Is the resistance below 5.0 ohms?
Yes>> Repair the Charcoal Canister Shutoff Valve Control circuit for a short to ground.
Perform Powertrain Verification Test - Ver 2
No>> Replace and program the Powertrain Control Module.
Perform Powertrain Verification Test - Ver 2