P1218

DTC P1218 Injection Pump Calibration Circuit






Circuit Description

The PCM uses a calibrated resistor mounted internally in the injection pump to determine 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. This is a type B DTC.

Conditions for Setting the DTC

^ PCM currently does not have a valid resistor valve.
^ PCM is unable to read a resistor value.

Action Taken When the DTC Sets

The lowest fuel table. Possible poor performance problem.

Conditions for Clearing the MIL/DTC

^ The PCM will turn the MIL off after three consecutive trips without a fault condition.
^ A History DTC will clear when forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71°C (16O°F) that same ignition cycle).
^ Use of a scan.

Diagnostic Aids

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

Test Description

Number(s) below refer to the 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 faulty injection pump.