SPN 97 - FMI 4 (Fault Code 429)

SPN 97 - FMI 4 (Fault Code 429)
ISB, ISC, and ISL with CM2150 - Water-in-Fuel Sensor Indicator

Fault Code: 429
PID(P), SID(S): P097
SPN: 97
FMI: 4/4

REASON: Water-in-Fuel Indicator Sensor Circuit - Voltage Below Normal or Shorted to Low Source. Low voltage detected at the water-infuel circuit.

EFFECT: None on performance. No water-in-fuel warning available.

Circuit Description:
The water-in-fuel sensor is attached to the fuel filter. The electronic control module (ECM) provides a 5 VDC reference signal to the water-in-fuel sensor. When the water collected in the fuel filter covers the sensor probes, the water-in-fuel sensor then pulls the 5 VDC reference voltage to ground, indicating high water accumulation in the fuel filter.

Component Location:
The water-in-fuel sensor is integrated into the bottom of the OEM supplied suction fuel filter. The OEM supplied fuel filter is located on the intake side of the engine.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes:
The ECM detects that the sensor signal voltage is below 0.05-VDC for 1 second.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.

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. If necessary, recalibrate the ECM.

Possible causes of this fault code include:
• Signal circuit shorted to ground in the harness, sensor, or connector.

Read More:
SPN 97 - FMI 3 (Fault Code 428)
SPN 97 - FMI 15 (Fault Code 418)


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