P0216

CIRCUIT DESCRIPTION
The timing of the combustion event is accomplished by controlling the beginning of injection measured in degrees of crankshaft rotation before Top Dead Center (TDC). This test compares the desired timing to the measured timing when certain conditions have been met. In order to retard the injection timing, the Powertrain Control Module (PCM) extends the stepper motor. In order to advance the injection timing, the PCM retracts the stepper motor.

CONDITIONS FOR RUNNING THE DTC
^ The PCM performs this DTC diagnostic test 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
^ There is a 5 degree difference between the Act. Inj. Time and the 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:
^ Faulty connections
^ Rubbed-through wire insulation
^ A broken wire inside the insulation

A hard start and a possible poor performance condition might exist. DTC P0216 will possibly set if the injection timing is not set correctly. Refer to Fuel Injection Pump Timing Adjustment for the correct procedure.

Opens or grounds in any of the circuits may result in full advance and very noisy operation.

Check the Snapshot Data in order to confirm the diagnosis. If the error is less than the Desired Timing, the fault is not the result of a circuit condition. If the error is more than the Desired Timing, check all of the circuits that are related to the Injection Timing Stepper (ITS) motor.

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 a 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. The voltage may vary between 1-12 volts and will usually vary between 5-6 volts when the engine is idling. This indicates that the PCM is OK and that there is a condition with the injection timing stepper motor. If there is a steady voltage present on any circuit, this indicates a condition with the PCM or a circuit that is shorted to voltage.