P1216

Circuit Description
The Injection Pump delivers the fuel to the individual cylinders by opening and closing a solenoid control fuel valve. The Powertrain Control Module (PCM) monitors the amount of time it takes for the fuel solenoid valve to physically close after commanded to close. The closure time out of range is seen as a fault. This response time is measured in milliseconds.

Conditions for Running the DTC
^ The battery voltage is greater than 10 volts and less than 16 volts.
^ The Engine Coolant Temperature is greater than -1°C (34°F).
^ The engine speed is greater than 506 RPM.
^ The requested fuel rate is greater than 0.0 mm.

Conditions for Setting the DTC
The Inj. Pump Closure Time is less than 0.75 ms.

Action Taken When the DTC Sets
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM records the operating conditions at the time the diagnostic fails. This information is stored in 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
Intermittent DTCs (P0251, P0370 and P1216) may be caused by air entering the fuel system when fuel levels get below 1/8 of a tank while performing hard acceleration or turning maneuvers. Its also possible that a DTC P0251, P0370 and P1216 will set if vehicle has run out of fuel. Customer driving habits should be checked to determine if vehicle has been performing in these manners. If it has been determine that the vehicle has been performing in these conditions, bleed fuel system of all air and test drive vehicle.

If DTC P1216 is set with any of the other DTCs, diagnose those DTCs first. If the vehicle is running close to the DTC setting closure time, the vehicle should be checked during the cold start ups and during hot conditions.

An intermittent may be caused by the following:
^ Poor connections Rubbed through wire insulation
^ Broken wire inside the insulation

Test Description
The number(s) below refer to the step number(s) on the Diagnostic Table.
2. This step will determine if the ground circuit is open which causes the vehicle not to start.
3. This step will determine if the signal circuit is open or an injection pump (fuel solenoid) is malfunctioning.