Workshop Manual

6E–390
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1111 –IAT Sensor Circuit Intermittent High Voltage
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 Is DTC P0113 also set?
—
Go to DTC
P0113 chart
first
Go to Step 3
3 Is DTC P1115, also set? — Go to Step 6 Go to Step 4
4 1. Check for a poor sensor ground circuit terminal
connection at the IAT sensor.
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair Go to Step 5
5 1. Check for a poor IAT signal circuit terminal
connection at the IAT sensor.
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair Go to Step 6
6 1. Check the IAT signal circuit between the IAT sensor
connector and the PCM for an intermittent open.
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair Go to Step 7
7 1. Check the IAT signal circuit between the IAT sensor
connector and the PCM for an intermittent short to
voltage.
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair Go to Step 8
8 1. Check for a poor sensor ground circuit terminal
connection at the PCM.
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair Go to Step 9
9 1. Check for an intermittent open or a faulty splice in
the sensor ground circuit.
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair
Refer to
Diagnostic
Aids