Circuit Description
The PZM monitors the fuel level sensor to determine the level of fuel in the tank. The PZM supplies the sensor with a reference voltage. The sensor varies the voltage based on the level of fuel in the tank. When the tank is full, the sensor resistance is high, and the PZM senses a high signal voltage. As the fuel level in the tank decreases, the sensor resistance drops, and the signal voltage at the PZM is pulled low. The PZM calculates the level of fuel in the tank, and sends the information via class 2 serial data to the PCM and the IPC. The IPC uses the data to control the fuel gauge. The PCM uses the fuel level input run certain system tests. Some of these system tests include the following:
| • | EVAP System |
| • | Misfire |
| • | Oxygen Sensor |
Conditions for Running the DTC
| • | No VSS DTCs are set. |
| • | The engine is running. |
| • | System voltage is between 11 and 16 volts. |
| • | Vehicle speed is more than 5 km/h. |
Conditions for Setting the DTC
The fuel level sensor voltage indicates that tank volume has not changed over a distance of 60 kilometers (37.5 miles).
Action Taken When the DTC Sets
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM will store the conditions present when the DTC set as Failure Records data only. |
Conditions for Clearing the MIL/DTC
| • | The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool Clear DTC Information function. |
Diagnostic Aids
Important: Fuel level is used to determine EVAP system diagnosis. Always diagnose the fuel level sensor before any other EVAP system components or DTCs.
Refer to Instrument Panel Cluster (IPC) in for additional diagnostic information.
If the condition is intermittent, refer to Intermittent Conditions in Symptoms.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On Board Diagnostic (OBD) System Check? | -- | Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges, and Console |
