P1216

Diagnostic Chart:

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 milliseconds. This is a type D DTC.

Conditions for Setting the DTC

^ Battery voltage greater than 12 volts and less than 15 volts.
^ Engine coolant temperature greater than 50°C (122°F).
^ ENGINE SPEED greater than 1350 RPM.
^ Requested fuel rate is greater than 0.0 mm.
^ Inj. Pump Closure Time less than 0.75 ms.

Action Taken When the DTC Sets
The MIL will not illuminate.

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
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. It's also possible that a 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 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.

An intermittent can be caused by the following:

^ Poor connections
^ Rubbed through wire insulation
^ Broken wire inside the insulation.

Test Description
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 at fault.

***This is TSB update 67-65-39, dated January 1997****

Subject:
Intermittent Malfunction Indicator Lamp (MIL) with DTCs P0251, P0370, P1216 and Stumble, Stall, Hard Start (Check Fuel Tank Level)

Condition
Some owners may experience an intermittent Malfunction indicator Lamp (MIL) associated with history DTC's P0251, P0370, P1216. Also, owners may experience a stumble, hard start or stall. It is possible that the technician may not be able to duplicate the driveability concern but will notice history DTCs on the Tech 2 scanner.

Cause
Air entering the fuel system when fuel levels get below 1/8 of a tank during hard acceleration or turning maneuvers.

Correction
Check fuel tank level, if necessary fill tank to at least 1/2 full and purge air from fuel system using procedure in Service Manual. Erase DTCs on Tech 2 scanner. Additionally, inform customer of conditions associated with low fuel levels indicated in the Diesel Supplement Owner's Manual.