Isuzu 2000 Trooper Workshop Manual page 1341

6E–472
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1514 - TPS-MAF Correlation Error (Cont'd)
Step
9 1. Ignition"ON", engine not running.
2. Observe the MAP reading on the Tech 2.
Is the MAP reading less than the specified value?
10 1. Disconnect the MAP sensor.
2. Connect a test 5 volt reference circuit and the MAP
signal at the MAP sensor harness connector.
3. Observe the MAP reading on the Tech 2.
Is the MAP reading less than the specified value? (If no,
start with diagnosis chart for other sensors in the circuit
and see if 5Vreturns.)
11 1. Check the MAP signal circuit between the PCM and
MAP ground circuit.
2. If the MAP signal circuit is open or shoted, repair it
as necessary.
Was the MAP signal circuit open or shorted?
12 Replace the MAP sensor.
Is the action complete?
13 Observe the TP angle reading on the Tech 2 while
slowly opening the throttle.
Does the TP angle increase steadily and evenly from
the closed throttle value to the wide open throttle
value?
14 1. Disconnect the TP sensor.
2. Observe the TP sensor reading on the Tech2.
Is the TP sensor reading near the specified value?
15 1. Connect a test light between the 5Volt reference
circuit and the TP1 and TP2 sensor signal circuit at
the TP sensor harness connector.
2. Observe the TP sensor reading on the Tech2.
Is the TP sensor reading near the specified value?
16 Check the following items;
1. TP1 and TP2 signal circuit for a short to voltage.
2. TP1 and TP2 sensor ground circuit for high
resistance between the PCM and the TP sensor.
3. TP1 and TP2 sensor ground circuit for a poor
connection.
4. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
Action Value(s) Yes
Go to Step 10
65kPa
— Go to Step 12
— Verify repair
— Verify repair
Closed
throttle TP
sensor 1 =8 ∼
10 % TP
sensor 2 =90
∼ 92 % Wide
open throttle
TP sensor 1
=90 ∼ 92 %
Refer to
TP sensor 2 Diagnostic
=8 ∼ 10 %
Aids
0V Go to Step 15
5V Go to Step 18
— Verify repair
No
Go to Step 13
Go to Step 11
Go to Step 13
—
Go to Step 14
Go to Step 16
Go to Step 17
Go to Step 19