DTC detecting condition | Trouble area |
---|---|
•
Low intake air temperature
(High voltage – High resistance) • High intake air temperature (Low voltage – Low resistance) |
•
“LT GRN/BLK” circuit open or shorted to power.
• “BLK/BLU” circuit open • IAT sensor malfunction • ECM malfunction |
Step | Action | YES | NO |
---|---|---|---|
1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
2 |
Check IAT sensor and its circuit
2)
Turn ignition switch ON.
3)
Check intake air temp. displayed on scan tool.
Is – 40 °C (–40 °F) or 119 °C (246 °F) indicated?
|
Go to Step 3.
|
Intermittent trouble. Check for intermittent referring to
Intermittent and Poor Connection Inspection
.
|
3 |
Does scan tool indicate –40 °C (–40 °F) at Step 2.
|
Go to Step 4.
|
Go to Step 6.
|
4 |
Check wire harness
1)
Disconnect IAT sensor connector with ignition switch OFF.
3)
If OK, then with ignition switch ON.
Is voltage applied to “LT GRN/BLK” wire terminal about 4 – 6 V?
|
Go to Step 5.
|
“LT GRN/BLK” wire open or shorted to power, or poor “E115-15 (E115-23)” connection.
If wire and connection are OK, substitute a known-good ECM and recheck.
|
5 |
Check wire harness
1)
Measure resistance between “BLK/BLU” wire terminal of IAT sensor connector and body ground.
Is resistance continuity?
|
Replace IAT sensor.
|
“BLK/BLU” wire open or poor “E115-10” connection.
If wire and connection are OK, substitute a known-good ECM and recheck.
|
6 |
Check wire harness
1)
Disconnect IAT sensor connector with ignition switch OFF.
2)
Measure resistance between “LT GRN/BLK” wire terminal of IAT sensor connector and body ground.
Is resistance infinity?
|
Replace IAT sensor.
|
“LT GRN/BLK” wire is shorted to ground.
If wire is OK, substitute a known-good ECM and recheck.
|