P0216

CIRCUIT DESCRIPTION
Timing of the combustion event is accomplished by delivering a pulse of fuel into the combustion chamber at a desired degree of piston travel. This desired degree (desired timing) defines the current position of the piston in relationship of Top Dead Center (TDC). This test compares desired timing to measured timing when certain conditions have been met. To retard injection timing, the Powertrain Control Module (PCM) extends the stepper motor. To advance injection timing the PCM retracts the stepper motor. This is a type B Diagnostic Trouble Code (DTC).

CONDITIONS FOR RUNNING THE DTC
^ The PCM performs this DTC diagnostic continuously.
^ DTCs P0251, P0335, or P0370 are not set.
^ The engine speed has not changed more than 56 RPM for 5 seconds.

CONDITIONS FOR SETTING THE DTC
^ A 5-degree difference between Act. Inj. Time and Des. Inj. Time
^ All of the diagnostic set conditions are met for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
^ A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
^ Use a scan tool in order to clear the MIL and the DTC.

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

A hard start and possible poor performance condition might exist. Act. Inj. Time will freeze at the point of the fault. DTC P0216 may set if the injection timing is not set correctly. Refer to Fuel Injection Pump Timing Adjustment for correct procedure.

TEST DESCRIPTION

Steps 1-9:

Steps 10-18:

The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if DTC P0216 is a hard failure or an intermittent.
4. This step checks for an open or short in the injection timing coil circuit 1.
5. This step checks for an open or short in the injection timing coil circuit 2.
6. The important thing in this step is that the PCM is sending a varying voltage (voltage may vary between 1-12. Usually you will see the voltage vary between 5-6 when the engine is idling), this will indicate that the PCM is OK and that there is a problem with the injection timing stepper motor. If there is a steady voltage present on any circuit, there is a short to voltage or internal PCM problem.