GM/Detroit 6.5L ENGINE CONTROLS – DTC P1217 Fuel Solenoid Response Time Too Long

Circuit Description
The injection pump delivers fuel to individual cylinders by opening and closing a solenoid control fuel valve. The PCM monitors the amount of time it takes for the fuel solenoid valve to physically close after commanded to close. Closure time out of range is seen as a fault. This response time is measured in milli seconds.

Conditions for Setting the DTC
• The battery voltage greater than 12 volts and less than 15 volts.
• The engine coolant temperature is greater than 50°C (122°F).
• The ENGINE SPEED greater than 1350 RPM.
• The requested fuel rate is greater than 0.0 mm
• The Closure Time is greater than 2.5 ms.

Action Taken When the DTC Sets
• The Malfunction Indicator Lamp (MIL) will not illuminate.
• The PCM records the operating conditions at the time the diagnostic fails. This information stores in the Failure Records.

Conditions for Clearing the MIL/DTC
• 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 (160°F) that same ignition cycle.
• Use of a Scan tool

Diagnostic Aids
A weak (mechanical failure) fuel solenoid will result in a DTC P1217. If DTC P1217 is set with any other DTCs, diagnose them first. If the vehicle is running close to the DTC setting closure time, vehicle should be checked during cold start ups and during hot conditions. Poor performance and starting conditions will exist. Fuel contamination could also cause this DTC.

Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
3. This step determines if DTC 1217 is a hard failure or an intermittent.
6. This step will determine if the solenoid is at fault, or if there is a problem with the PCM or wiring.


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