Engine Cranking Diagnostic Mode

NOTE: Access the battery energy control module (BECM) and monitor the high voltage traction battery state of charge parameter identification (PID). If the monitored PID displays the state of charge below 45%, run the vehicle in the Engine Running Diagnostic Mode to raise the BECM state of charge. When the high voltage traction battery state of charge exceeds 45%, the engine cranking diagnostic mode can be activated.

The engine cranking diagnostic mode is a PCM strategy which is separate from the normal operating strategy. It allows the engine to crank in a similar fashion as a conventional vehicle with the fuel disabled. When in this mode, the PCM commands the TCM to spin the generator which cranks the engine with the speed between 900 and 1, 200 RPM. To activate the engine cranking diagnostic mode the gear selector must be in the PARK position, the high voltage traction battery state of charge must be greater than 45%, and the ignition must be cycled to the START position. The engine cranks as long as the high voltage traction battery state of charge stays greater than 35%. The hazard indicator (red triangle) flashing once per second indicates the vehicle is in the engine cranking diagnostic mode. In this mode the throttle plates can be moved from closed to open by applying and holding the brake pedal before applying the accelerator pedal. After moving the throttle plate position twice, function may be disabled and diagnostic trouble code (DTC) P2111 may set. To carry out this function again, clear the DTCs and enter this mode again. This mode is helpful whenever the engine must be cranked but not started. Carry out the following sequence to activate this mode:

apply the parking brake
place the gear selector in the PARK position
ignition in the OFF position
NOTE: Do not start the engine.
ignition in the ON position with the engine OFF
within 5 seconds of the ignition in the ON position, fully apply the accelerator pedal and hold for 10 seconds
within 5 seconds release the accelerator pedal, shift the gear selector to the NEUTRAL position and fully apply the accelerator pedal
hold the accelerator pedal fully applied for 10 seconds
release the accelerator pedal and shift the gear selector to the PARK position

If the sequence is correctly executed the hazard indicator (red triangle) flashes once per second when the gear selector is shifted to the PARK position. The engine may be cranked by cycling the ignition to the START position. If the ignition stays in the START position for 15 seconds or longer, the PCM may set the DTC P2535. The PCM exits the engine cranking diagnostic mode when the high voltage traction battery state of charge drops below 35%, the gear selector is shifted to any gear other than PARK, or when the ignition is turned to the OFF or ACC position.