richierevs
08-10-2009, 02:40 PM
Abstract
This knowledgebase post describes a potential hazardous and damaging condition that may occur due to corrupt PCM/ECU software. This condition may occur when restoring the original base tune from the Predator.
Predator Write Fail Condition
While attempting to restore the original base tune to the PCM/ECU the Predator returns a write fail error after attempting the verify the write. When this condition occurs the Predator cannot be updated (CROM update) nor can the Predator be used to restore any prior tunes to the PCM/ECU.
Under normal lockout conditions the Predator and the PCM/ECU may need to be sent to DiabloSport to be reset. A reset by the dealer (StarScan) may not correct the lockout.
Important Rare Case
In very rare cases the PCM/ECU may become corrupt and may cause the fuel injectors to cycle at or near their full duty cycle during a Key On, Engine OFF (KOEO) condition.
The symptom is a rapid clicking sound coming from under the hood in an around the intake manifold. The clicking sound is the injector selenoids firing in rapid succession.
In this extreme and potential harmful and hazardous condition it is important to do the following:
Turn-off key immediately!!
Disconnect the Negative (-) Ground on the Battery
If uncertain of how to fix, make arrangements to have the vehicle towed to either a reputable service center or dealer.
Check oil level to determine if it is abnormally high (sign of gas in the oil).
When vehicle is lifted onto tow truck, inspect the area for signs of oil/gas spillage. Use appropriate material to cover and soak up oil/gas.
Call the service center and indicate the potential seriousness of the situation. Make sure they understand!!! Under these conditions, THE ENGINE SHOULD NOT BE CRANKED. Cranking the engine under hydrolock can cause severe damage to pistons, rods, valves, and even the engine block resulting in a costly repair.
Servicing Hydrolock
To resolve a hydrolock condition do the following (for illustrative purposes only, refer to service manual for details):
Remove the fuses for the ignition and fuel pump (see owners manual for fuse location).
Remove coil packs.
Remove spark plugs from all cylinders.
Disconnect mid-pipes from CATS/Headers. Allow any oil/fuel to drain.
Cover the fenders with protective material.
Assure that the area is clear on both sides of the engine compartment.
Connect battery.
Reset PCM/ECU to enable engine crank (if necessary).
Using a scope, examine each cylinder for potential damange. STOP!!! DO NOT PROCEED IF DAMAGE IS PRESENT!!!
Change the oil (precautionary in case of fuel contamination)
Crank engine to allow excess fuel to escape (may exit cylinders in forceful streams).
Disconnect battery.
Using compressed air, blow out any excess fuel from the cylinders.
Clean/Replace spark plugs.
Replace coil packs
Replace fuses for ignition and fuel pump.
Reconnect mid-pipes to CATS/Headers.
Connect battery.
Crank and start engine.
If engine runs normally, allow to warm up to operating temperature; otherwise, STOP!!!
This knowledgebase post describes a potential hazardous and damaging condition that may occur due to corrupt PCM/ECU software. This condition may occur when restoring the original base tune from the Predator.
Predator Write Fail Condition
While attempting to restore the original base tune to the PCM/ECU the Predator returns a write fail error after attempting the verify the write. When this condition occurs the Predator cannot be updated (CROM update) nor can the Predator be used to restore any prior tunes to the PCM/ECU.
Under normal lockout conditions the Predator and the PCM/ECU may need to be sent to DiabloSport to be reset. A reset by the dealer (StarScan) may not correct the lockout.
Important Rare Case
In very rare cases the PCM/ECU may become corrupt and may cause the fuel injectors to cycle at or near their full duty cycle during a Key On, Engine OFF (KOEO) condition.
The symptom is a rapid clicking sound coming from under the hood in an around the intake manifold. The clicking sound is the injector selenoids firing in rapid succession.
In this extreme and potential harmful and hazardous condition it is important to do the following:
Turn-off key immediately!!
Disconnect the Negative (-) Ground on the Battery
If uncertain of how to fix, make arrangements to have the vehicle towed to either a reputable service center or dealer.
Check oil level to determine if it is abnormally high (sign of gas in the oil).
When vehicle is lifted onto tow truck, inspect the area for signs of oil/gas spillage. Use appropriate material to cover and soak up oil/gas.
Call the service center and indicate the potential seriousness of the situation. Make sure they understand!!! Under these conditions, THE ENGINE SHOULD NOT BE CRANKED. Cranking the engine under hydrolock can cause severe damage to pistons, rods, valves, and even the engine block resulting in a costly repair.
Servicing Hydrolock
To resolve a hydrolock condition do the following (for illustrative purposes only, refer to service manual for details):
Remove the fuses for the ignition and fuel pump (see owners manual for fuse location).
Remove coil packs.
Remove spark plugs from all cylinders.
Disconnect mid-pipes from CATS/Headers. Allow any oil/fuel to drain.
Cover the fenders with protective material.
Assure that the area is clear on both sides of the engine compartment.
Connect battery.
Reset PCM/ECU to enable engine crank (if necessary).
Using a scope, examine each cylinder for potential damange. STOP!!! DO NOT PROCEED IF DAMAGE IS PRESENT!!!
Change the oil (precautionary in case of fuel contamination)
Crank engine to allow excess fuel to escape (may exit cylinders in forceful streams).
Disconnect battery.
Using compressed air, blow out any excess fuel from the cylinders.
Clean/Replace spark plugs.
Replace coil packs
Replace fuses for ignition and fuel pump.
Reconnect mid-pipes to CATS/Headers.
Connect battery.
Crank and start engine.
If engine runs normally, allow to warm up to operating temperature; otherwise, STOP!!!