Isuzu 2000 Trooper Workshop Manual page 1351

6E–482
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1523 - Actuator Control Return Performance (Cont'd)
Step
10 Check the following items;
1. TP1and TP2 signal circuit or 5 volt reference circuit
for a poor connection.
2. TP1 and TP2 signal circuit or 5 volt reference circuit
for high resistance between the PCM and the
TP1and TP2 sensor.
3. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
11 Replace the TP sensor.
Is the action complete?
12 Replace the PCM.
IMPORTANT:
The replacement PCM must be programmed. Refer to
ON-Vehicle Service in Power Control Module and
Sensors for procedures.
And also refer to latest Service Bulletin. Check to see if
the latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replasement PCM.
Is the action complete?
Action Value(s) Yes
— Verify repair
— Verify repair
— Verify repair
No
Go to Step 12
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