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EVAP Control System Diagnosis: Troubleshooting

TROUBLESHOOTING SPECIFICATIONS

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD II) System Check.
Is the system check complete?		 - Go to Step 2 Go to ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK .
2
  1. Turn the ignition OFF.
  2. Install the scan tool.
  3. Ignition ON.

Are any Diagnostic Trouble Codes (DTCs) set?		 - Go to applicable DTC table Go to Step 3
3
  1. Disconnect the fuel tank pressure sensor electrical connector.
  2. Using a Digital Voltmeter (DVM), measure the voltage between the 5 volt reference circuit and the sensor ground circuit at the fuel tank pressure sensor harness connector.

Is the voltage near the specified value?		 5 V Go to Step 6 Go to Step 4
4 Check the 5 volt reference circuit for a poor terminal connection at the Engine Control Module (ECM).
Is a problem found?		 - Go to Step 12 Go to Step 5
5 Check for an open 5 volt reference circuit to the fuel tank pressure sensor harness connector.
Is a problem found?		 - Go to Step 11 Go to Step 9
6
  1. Remove the fuel cap.
  2. Connect a jumper between terminal A at the fuel tank pressure sensor pigtail and terminal A at the harness connector on the ECM side.
  3. Connect a jumper between terminal C at the fuel tank pressure sensor pigtail and terminal C at the harness connector on the ECM side.
  4. Using a DVM, measure voltage at terminal B at the fuel tank pressure sensor pigtail.

Is the voltage between the specified values?		 1.3 - 1.7 V Go to Step 7 Go to Step 14
7 Check the fuel tank pressure sensor signal circuit for a poor terminal connection at the ECM and repair as necessary.
Is a repair necessary?		 - Go to Step 12 Go to Step 8
8 Check the fuel tank pressure sensor signal circuit between the fuel tank pressure sensor connector and the ECM for an open, short to ground, or short to voltage and repair as necessary.
Is a repair necessary?		 - Go to Step 13 Go to Step 15
9 Check the sensor ground circuit for a poor terminal connection at the ECM and repair as necessary.
Is a repair necessary?		 - Go to Step 12 Go to Step 10
10 Check for an open in the sensor ground circuit.
Is a problem found?		 - Go to Step 13 Go to Step 15
11 Check for a poor circuit terminal connection at the fuel tank pressure sensor connector and repair as necessary.
Is a repair necessary?		 - System OK -
12 Replace the malfunctioning harness connector terminals.
Is the repair complete?		 - System OK -
13 Locate and repair the open/short circuit in the wiring harness.
Is the repair complete?		 - System OK -
14 Replace the fuel tank pressure sensor.
Is the repair complete?		 - System OK -
15 Replace the ECM.
Is the repair complete?		 - System OK -
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