Workshop Manual

6E–495
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1625 PCM Unexpected Reset
Circuit Description
The powertrain control module (PCM) monitors
unexpected PCM reset. This will not turn on MIL light on,
only record code DTC P1625.
Conditions for Setting the DTC
B Clock or COP (Computer Operating Properly) reset.
Action Taken When the DTC Sets
B The PCM will not illuminate the malfunction indicator
lamp (MIL).
B The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC
B The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
B A history DTC P1625 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
B DTC P1625 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
B P1625 stored alone does not need diagnosis. Clear
DTC code.
DTC P1625 – PCM Unexpected Reset
Step Action Value(s) Yes No
1 Was the “On-Board Diagnostic (OBD) System Check”
performed?
— Go to Step 2
Go to OBD
System
Check
2 1. Ignition is “ON”.
2. Install the Tech 2.
3. Start the engine and let it Idle.
4. On the Tech 2, select “DTC info”.
Does the Tech 2 indicate DTC P1625 failed?
— Go to Step 3
Go to
Diagnostic
Aids
3 1. Ignition is “ON”.
2. Clear DTC P1625 by using the Tech 2 “Clear Info”.
3. Start the engine and let it Idle.
4. On the Tech 2, select “DTC info”.
Does the Tech 2 indicate DTC P1625 failed?
— Go to Step 4
Go to
Diagnostic
Aids
4 1. Check for aftermarket electronics, such as
transceiver, stereos, and anti theft devices. They
may radiate EMI into the control system if they are
improperly installed. (This may cause a false sensor
reading and turn on the MIL.)
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair —