Diagnostic Trouble Code (Dtc) P1625 Pcm Unexpected Reset - Isuzu 1999 RODEO Workshop Manual

6E2–412
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P1625 PCM Unexpected Reset

Circuit Description
The powertrain control
unexpected PCM reset. This will not turn on MIL light on,
only records code DTC P1625.
Conditions for Setting the DTC
f Clock or COP (Computer Operating Properly) reset.
Action Taken When the DTC Sets
f The PCM will not illuminate the malfunction indicator
lamp (MIL).
f 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.
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 1. Ignition is "ON".
2. Install the Tech 2.
3. Start the engine at let it Idle.
4. On the Tech 2, select "DTC info".
Does the Tech 2 indicate DTC P1625 failed?
3 1. Ignition is "ON".
2. Clear DTC P1625 by using the Tech 2 "Clear Info".
3. Start the engine at let it Idle.
4. On the Tech 2, select "DTC info".
Does the Tech 2 indicate DTC P1625 failed?
4 1. Check for aftermarket electronics, such as
transceiver, stereos, and anti theft devices. 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?
module (PCM) monitors
DTC P1625 – PCM Unexpected Reset
Action
Conditions for Clearing the MIL/DTC
f 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.
f A history DTC P1625 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
f 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:
f P1625 alone stored does not need diagnosis. Clear
DTC code.
Value(s)
— Go to Step 2
— Go to Step 3
— Go to Step 4
— Verify repair
Yes No
Go to OBD
System
Check
Go to
Diagnostic
Aids
Go to
Diagnostic
Aids
—