SPN 3241 - FMI 4 (Fault Code 1665)
SPN324 FMI4
Aftertreatment Exhaust Gas Temperature 1 Circuit - Voltage Below Normal or Shorted to Low Source
CODES:
Fault Code: 1665
PID(P), SID(S): None
SPN: 3241
FMI: 4/4
Lamp: Amber
REASON: Aftertreatment Exhaust Gas Temperature 1 Circuit - Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the catalyst inlet sensor circuit.
EFFECT: Active aftertreatment diesel particulate filter regeneration will be disabled.
Conditions for Setting the Fault Codes:
The ECM detects that the aftertreatment diesel oxidation catalyst inlet temperature sensor signal voltage is less than 0.1-VDC for more than 2 seconds.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• A default value for the aftertreatment diesel oxidation catalyst inlet temperature sensor reading is used.
• Active regeneration of the aftertreatment diesel particulate filter is disabled.
Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes. The ECM detects that the aftertreatment diesel oxidation catalyst inlet temperature sensor signal voltage has returned to normal operating conditions for more than 4 seconds.
Shop Talk:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM.
The aftertreatment diesel oxidation catalyst inlet temperature sensor shares return wires in the OEM harness with other sensors. A shorted return wire can cause multiple fault codes to be active.
Possible causes of this fault code include:
• Signal shorted to ground in the harness
• Signal shorted to return or ground in the sensor.
Read More:
SPN 3241 - FMI 11 (Fault Code 1663)
SPN 3050 - FMI 11 (Fault Code 1664)
Blog.Teknisi
Aftertreatment Exhaust Gas Temperature 1 Circuit - Voltage Below Normal or Shorted to Low Source
 |
| ISB, ISC, and ISL - Aftertreatment Temperature Sensors |
CODES:
Fault Code: 1665
PID(P), SID(S): None
SPN: 3241
FMI: 4/4
Lamp: Amber
REASON: Aftertreatment Exhaust Gas Temperature 1 Circuit - Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the catalyst inlet sensor circuit.
EFFECT: Active aftertreatment diesel particulate filter regeneration will be disabled.
Conditions for Setting the Fault Codes:
The ECM detects that the aftertreatment diesel oxidation catalyst inlet temperature sensor signal voltage is less than 0.1-VDC for more than 2 seconds.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• A default value for the aftertreatment diesel oxidation catalyst inlet temperature sensor reading is used.
• Active regeneration of the aftertreatment diesel particulate filter is disabled.
Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes. The ECM detects that the aftertreatment diesel oxidation catalyst inlet temperature sensor signal voltage has returned to normal operating conditions for more than 4 seconds.
Shop Talk:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM.
The aftertreatment diesel oxidation catalyst inlet temperature sensor shares return wires in the OEM harness with other sensors. A shorted return wire can cause multiple fault codes to be active.
Possible causes of this fault code include:
• Signal shorted to ground in the harness
• Signal shorted to return or ground in the sensor.
Read More:
SPN 3241 - FMI 11 (Fault Code 1663)
SPN 3050 - FMI 11 (Fault Code 1664)
Blog.Teknisi
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