Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 1  - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store the FREEZE FRAME data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
2. 3  - This step checks the operation of the rocker arm oil control solenoid. When commanded ON, the rocker arm oil control solenoid increases valve lift enough to cause the engine to run rough or to stall.
3. 4  - This step visually inspects the operation of the rocker arm oil control solenoid. The solenoid plunger and spool valve movement should be smooth and rapid from extended to retracted.
4. 8  - This step tests the operation of the rocker arm oil pressure switch. The oil pressure switch is normally closed to ground with less than 3 psi (20.7 kPa) of oil pressure. With the oil control solenoid energized oil pressure will open the switch and the test light should turn off momentarily before the engine stalls.
5. 11  - This step checks for electrical resistance in the wiring and connections of the rocker arm oil control solenoid circuit. Circuit resistance as small as 25 ohms can cause the solenoid to malfunction and a DTC P1693 to set.