P1218

DTC P1218 Injection Pump Calibration Circuit






Circuit Description

The 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 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 oft after three consecutive trips without a fault condition.
^ A History DTC will clear after forty consecutive warm-up cycles, it this or any other emission related diagnostic does not report any failures.
^ Use of a scan tool will clear the DTC codes.

Diagnostic Aids

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

Test Description

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 malfunctioning injection pump. This DTC will only clear DTC Status when a Time Set procedure has been activated (injection timing does not have to be adjusted).