PCM Reset
Revised on the 26/01/2002

PCM reset Proceduce

Motor at operationing temperature a MUST

1.Turn ignition ON
2.
Model VT Remove PCM/BCM fuse number 4 which is F31 Note: for VX,VU ,V2 remove fuse F29 10amp Eng Cont/BCM

fusebox.jpg
3.
Wait 20 seconds for the Car to chime to you.
4. Turn ignition OFF.
5.
Model VT Replace PCM/BCM fuse 4 which is F31 Note: for VX,VU ,V2 remove fuse F29 10amp Eng Cont/BCM
6.
Proceed to the idle learn Procedure.

CLEARING THE DTCS
To clear a current diagnostic trouble code from the memory of the PCM, the PCM power feed must be disconnected
for at least ten (20) seconds, or the Tech 2 scan tool must be used. The battery power feed can be disconnected
by:
• Disconnecting the negative battery terminal
• Removing the Fuse F31 in the engine compartment fuse/relay panel.


CLEARING THE DTC HISTORY CODE
The Tech 2 scan tool is the only tool capable of clearing the DTC history code. Disconnecting the battery will not
erase DTC history. The Tech 2 scan tool sends a special message to the PCM to erase the DTCs.

IGNITION CYCLE DEFAULT
If the ignition is cycled (OFF and ON) 50 times without a particular fault resetting,
that DTC will be cleared from the
PCM memory
and the ignition cycle counter in the PCM will reset to zero. This is another way to clear any code, but not all, but might help you out.


 

Then follow the idle learn procedures

Idle Learn Procedure

Anytime the powertrain control module (PCM) or the battery is disconnected, the PCM loses power
by removing
F31, or the PCM is reprogrammed, the PCMs learned idle position is lost.

Perform the following procedure in order to return the learned idle to the correct position:-

Automatic Transmission

1. Turn OFF the ignition.
2.Restore the
PCM battery feed if removed, or replace fuse 4 which is F31.
3.Turn
OFF the A/C controls.
4. Set the parking brake and block the drive wheels.
5.Start the engine.
6.Ensure that the engine coolant temperature is more than
80 Degrees.( Check in Mode Up button).
7.Shift the transmission into
Drive.
8.Allow the engine to
idle for 5 minutes.
9.Shift the transmission into
Park.
10.Allow the engine to
idle for 5 minutes.
11.Turn OFF the engine for
30 seconds.

Manual Transmission

1.Turn OFF the ignition
2.Restore the
PCM battery feed if removed, or replace Fuse 4 which is F31.
3.Turn
OFF the A/C controls.
4.Set the parking brake and block the drive wheels.
5.Place the transmission in
Neutral.
6.Start the engine.
7.Ensure that the engine coolant temperature is more than
80 Degrees.( Check in Mode Up button).
8.Allow the engine to idle for
5 minutes.
9.Turn
OFF the engine for 30 seconds.

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