ENGINE AND EMISSION CONTROL SYSTEM
6E1-27
SH410
CODE NO.18 (P0110) IAT SENSOR CIRCUIT
(SIGNAL VOLTAGE HIGH OR LOW)
1. ECM (PCM)
2. IAT sensor
3. IAT sensor connector
4. To other sensors
NOTE:
When Code No.11 (P0105), 13 (P0120), 18 (P0110) and
19 (P0115) are indicated together, it is possible that “B/
Or” wire is open or “E02-9” terminal connections are
poor.
STEP
ACTION
YES
NO
1
1) Disconnect IAT sensor connector with igni-
tion switch OFF.
2) Check voltage between “Lg” wire terminal
of IAT sensor connector and ground with
ignition switch ON.
Is voltage about 4 – 5 V?
Go to Step 2.
“Lg/B” wire open or short.
Poor “E02-14” connection.
2
1) Connect IAT sensor coupler terminals using
service wire.
2) Check voltage between “Lg” wire terminal
of IAT sensor connector and ground with
ignition switch ON.
Is voltage 0.15 V or less?
Go to Step 3.
“O” wire open or poor “E02-9”
connection.
If wire and connection are OK,
substitute a known-good ECM
(PCM) and recheck.
3
1) Perform IAT SENSOR INSPECTION in this
section.
Is IAT sensor in good condition?
Poor connection of IAT
sensor connector ter-
minals.
If connection is OK,
substitute a known-
good ECM (PCM) and
recheck.
Faulty IAT sensor.
Fig. for STEP 1
Fig. for STEP 2
1. IAT sensor connector disconnected
2. Engine ground
1. IAT sensor connector disconnected
2. Service wire
3. Engine ground
NOTE:
Upon completion of inspection and repair work, perform DTC Confirmation Procedure, referring to page
6E1-33 to confirm that the trouble has been corrected.