P1432

CIRCUIT DESCRIPTION
The Fuel Tank Pressure (FTP) sensor is a pressure transducer. The Alternative Fuels ECM supplies about 5 volts on the FTP sensor reference voltage circuit. The Alternative Fuels ECM also supplies a ground circuit to the FTP sensor. When fuel level/tank pressure is full the FTP signal voltage rises to 4.1 volts. As fuel level/tank pressure decreases to empty, the FTP signal voltage drops to around 0.5 volts. The Alternative Fuels ECM monitors the FTP signal circuit voltage and the Fuel Tank Temperature (FTT) sensor and determines the amount of fuel within the fuel tank.

This DTC is used to indicate a FTP sensor signal voltage that is below the normal operating range of the sensor.

CONDITIONS FOR RUNNING THE DTC
The engine is operating on alternative fuel.

CONDITIONS FOR SETTING THE DTC
The Alternative Fuels ECM monitors an FTP signal voltage of less than 0.5 volts for at least 1 second continuously.

ACTION TAKEN WHEN THE DTC SETS
^ The Alternative Fuels ECM will NOT illuminate the MIL.
^ The Alternative Fuels ECM will store this DTC as History during one drive trip in which the diagnostic runs and fails.
^ The Alternative Fuels ECM will record operating conditions at the time the DTC sets. This information will be stored as Freeze Frame data.

CONDITIONS FOR CLEARING THE DTC
^ The Last Test Failed status will clear when the DTC runs and passes.
^ The History status will clear after 40 consecutive WARM-UP cycles with NO failures of ANY DTC.
^ All DTC Information can be cleared using a scan tool.
^ Interruption of Control Module (Alternative Fuels ECM or the gasoline VCM I PCM or ECM) power or ground MAY clear DTC Information. Clearing DTC Information with this method is in-consistent and should not be performed.

DIAGNOSTIC AIDS

Intermittent Condition
A fault not present indicates the condition that caused the DTC to set is intermittent and not currently present. Refer to the Intermittent Conditions diagnostic information located in Symptoms - Computers and Control Systems. If any additional DTCs were stored proceed to the applicable DTC table in the order stated in Diagnostic System Check - Alternative Fuels (Computers and Control Systems). Initial Inspection and Diagnostic Overview Intermittent Conditions

TEST DESCRIPTION

Steps 1-3:

Steps 4-11:

The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the failure condition is present.
4. This step determines if the FTP is the cause of the failure condition.
5. This step determines if the 5-volt reference circuit is the cause of the failure condition.