Workshop Manual

6E–457
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1299 - ETC Forced Engine Shutdown Mode (Cont'd)
Step NoYesValue(s)Action
10 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. TP1and TP2 sensor ground circuit for a poor
connection.
4. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
— Verify repair Go to Step 13
11 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?
— Verify repair Go to Step 13
12 Replace the TP sensor.
Is the action complete?
— Verify repair —
13 1. Start the engine.
2. With the engine idling, monitor “MAF Frequency”
display on the Tech 2.
Is the “MAF Frequency” below the specified value?
6 ∼ 10 g/s Go to Step 16 Go to Step 17
14 1. Ignition “OFF”.
2. Disconnect the MAF sensor connector.
3. Ignition “ON”, engine idling.
4. Using a Tech 2, monitor “MAF Frequency”.
Does the Tech 2 indicate a “MAF Frequency” at the
specified value?
0g/s Go to Step 15 Go to Step 16
15 Replace the MAF sensor.
Is the action complete?
— Verify repair Go to Step 18
16 1. Check the MAF harness for incorrect routing near
high voltage components (solenoids, relays,
motors).
2. If incorrect routing is found, correct the harness
routing.
Was a problem found?
— Verify repair Go to Step 22
17 1. With the engine idling, monitor “MAF Frequency”
display on the Tech 2.
2. Quickly snap open throttle to wide open throttle
while under a road load and record value.
Does the Tech 2 indicate a “MAF Frequency” at the
specified value?
6 ∼ 10 g/s Go to Step 15 Go to Step 18
18 1. Ignition “ON”, engine not running.
2. Observe the MAP reading on the Tech 2.
Is the MAP reading less than the specified value?
65kPa Go to Step 19 Go to Step 22