DTC P2420. Pontiac Vibe

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2006 🢒 Vibe - AWD 🢒 Restraints 🢒 SIR 🢒 DTC P2420

System Description

The diagnostic strategy for the evaporative emission (EVAP) system uses a vacuum pump to test for system leaks, after the engine is OFF. A unique fuel tank, EVAP canister, and EVAP vacuum leak pump work together to provide enhanced system diagnosis. The vacuum leak pump, the fuel tank pressure (FTP) sensor and the EVAP canister vent valve are all integral parts of one assembly. The assembly is attached directly to the EVAP canister, located near the fuel tank.

After the vehicle has sat with the engine OFF for about 5 hours, a comprehensive diagnostic is enabled with no operator input necessary. The complete test can take up to 15 minutes to run, with leak detection comprising the largest portion of the test. For more detailed information on the EVAP system components and diagnostic theory, refer to Evaporative Emission Control System Description .

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P2420 Fuel Tank Pressure (FTP) Control Solenoid Control Circuit High Voltage

Conditions for Running the DTC

•	DTCs P0110, P0112, P0113, P0115, P0117, P0118, P0450, P0451, P0452, P0453, P2610 are not set.

•	Five hours have elapsed after the engine was turned OFF.

•	Atmospheric pressure is between 70-110 kPa.

•	Battery voltage is more than 10.5 volts.

•	Engine coolant temperature (ECT) is between 4-35°C (40-95°F).

•	Intake air temperature (IAT) is between 4-35°C (40-95°F).

•	The ignition remains OFF for the duration of the test.

•	DTC P2420 runs once per drive cycle when the above conditions are met.

Conditions for Setting the DTC

The powertrain control module (PCM) has determined the EVAP vent solenoid may be stuck OFF, OPEN, because vacuum pressure was not obtained.

Action Taken When the DTC Sets

•	The PCM illuminates the malfunction indicator lamp (MIL) after 2 consecutive ignition cycles in which the diagnostic runs with the fault active.

•	The PCM records the operating conditions at the time the diagnostic fails. This information is stored in the Freeze Frame buffer.

Conditions for Clearing the MIL/DTC

•	The PCM turns OFF the MIL on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.

•	A DTC will clear after 40 consecutive warm-up cycles have occurred without a fault.

•	A DTC can be cleared by using the scan tool Clear Information function.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

This step uses the EVAP Service Bay test in order to verify the correct operation of the EVAP vent solenoid, the EVAP purge solenoid, and the EVAP vacuum leak pump. Using the Service Bay test also tests for leaks by sealing the system and monitoring the FTP sensor.

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	--	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Install a scan tool. Turn ON the ignition, with the engine OFF. Disconnect the electrical connector of the evaporative emission (EVAP) vacuum leak pump assembly. Connect a test lamp across the EVAP vent solenoid control circuit and the ignition positive voltage circuit. Command the EVAP vent solenoid ON with the scan tool. Refer to Scan Tool Output Controls . Did the test lamp illuminate?	--	Go to Step 3	Go to Step 5
3	Remove the EVAP vacuum leak pump assembly. Refer to Evaporative Emission System Vacuum Leak Pump Replacement . Inspect the operation of the EVAP vent solenoid located in the vacuum pump assembly. Refer to Evaporative Emission Control System Diagnosis . Replace the part as necessary. Did you find and correct the condition?	--	Go to Step 11	Go to Step 4
4	Inspect for intermittent and for poor electrical terminal connections at the EVAP vacuum leak pump. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Repair as necessary. Refer to Wiring Repairs and Connector Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 11	Go to Step 8
5	Turn ON the ignition, with the engine OFF. Measure the voltage of the vent solenoid ignition positive voltage circuit. Is the voltage at the specified value?	B+	Go to Step 7	Go to Step 6
6	Repair the open in the vent solenoid ignition positive voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	--	Go to Step 11	--
7	Test for open or short in the vent solenoid control circuit. Repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 11	Go to Step 9
8	Replace the EVAP vacuum leak pump assembly. Refer to Evaporative Emission System Vacuum Leak Pump Replacement . Did you complete the replacement?	--	Go to Step 11	--
9	Inspect for intermittent and for poor electrical terminal connections at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Repair as necessary. Refer to Wiring Repairs and Connector Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 11	Go to Step 10
10	Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?	--	Go to Step 11	--
11	Use the scan tool in order to clear the DTCs. Turn OFF the ignition for 30 seconds. Turn ON the ignition, with the engine OFF. Perform the EVAP service bay test with the scan tool. Refer to EVAP Service Bay Test in Service Bay Test . Is DTC P2420 set in Last Test Failed?	--	Go to Step 2	Go to Step 12
12	Check for other EVAP DTCs in Last Test Failed. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	--	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information	System OK