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1A-102
Engine Control System (4JJ1)
Step
Observe the Intake Air Temperature (IAT) Sensor
parameter with a scan tool.
3
1.
2.
Disconnect the mass air flow/ intake air
temperature (MAF/ IAT) sensor harness
connector (Euro 4 specification) or the IAT
sensor harness connector (expect Euro 4
specification).
4
3.
(pin 4 of J38 [Euro 4 specification] or pin 1 of
J217 [expect Euro 4 specification]) and a
known good ground.
4.
Important: The IAT sensor may be damaged if the
sensor signal circuit is shorted to a voltage source.
1.
Test the signal circuit between the ECM (pin
72 of J14) and the IAT sensor (pin 4 of J38
[Euro 4 specification] or pin 1 of J217 [expect
Euro 4 specification]) for the following
5
conditions:
• A short to battery or ignition voltage
• A short to the 12 volts reference
2.
and 5 of J38 [Euro 4 specification] or pins 1 and 2
6
of J217 [expect Euro 4 specification]).
Is the IAT Sensor parameter less than the specified
Connect a 3-amp fused jumper wire between the
signal circuit (pin 4 of J38 [Euro 4 specification] or
pin 1 of J217 [expect Euro 4 specification]) and a
7
known good ground.
1.
72 of J14) and the IAT sensor (pin 4 of J38
[Euro 4 specification] or pin 1 of J217 [expect
Euro 4 specification]) for an open circuit or
8
high resistance.
2.
Action
Value(s)
Yes
-
Go to Step 15
0.1 volts
Go to Step 10
-
Go to Step 15
No
Go to Step 6
Go to Step 14
Go to Step 8
Go to Step 12
- Quick Links:
- Diagnostic Trouble Code (Dtc) List
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