P1218

Circuit Description
The Powertrain Control Module (PCM) uses a calibrated resistor which is mounted internally in the injection pump in order to determine the fuel rates. The resistor value is stored in the PCM memory. If the PCM memory has been disturbed or the PCM has been replaced, the PCM will relearn the resistor value on the next ignition cycle.

Conditions for Running the DTC
The ignition switch is in the ON position.

Conditions for Setting the DTC
^ The PCM currently does not have a valid resistor valve.
^ The PCM is unable to read a resistor value.

Action Taken When the DTC Sets
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive drive trip the diagnostic runs and fails.
^ The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the Failure Records store this information. If the diagnostic reports a failure on the second consecutive drive trip, the Freeze Frame records the operating conditions at the time of failure and updates the Failure Records.

Conditions for Clearing the MIL/DTC
^ The PCM will turn the MIL off after three consecutive trips without a fault condition.
^ A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures
^ The use of a scan tool.

Diagnostic Aids
Check the connection at fuel injector driver. Clear the DTC, and the cycle ignition. If the DTC clears, treat the condition as an intermittent.

Test Description
The number(s) below refer to the step number(s) on the Diagnostic Table.
3. This step will determine if there is a problem with the connection at the fuel solenoid driver or a malfunctioning injection pump.