Engine Oil Level Sensor Circuit — Voltage Above Normal, or Shorted to High Source Page 1 of 13

FAULT CODE 498

Engine Oil Level Sensor Circuit — Voltage Above
Normal, or Shorted to High Source
Overview

CODE REASON EFFECT

Fault Code: 498 Engine Oil Level Sensor Circuit — Voltage Above No protection for
PID: P098 Normal, or Shorted to High Source. High signal low engine oil
SPN: 98 voltage detected at engine oil level sensor circuit. level.
FMI: 3
LAMP: Amber
SRT:

Circuit: Engine Oil Level Sensor.

Circuit Description

The engine oil level sensor is used by the ECM to determine high or low engine oil levels.
The oil level is only checked when the engine has not been running for period of time. The
engine oil level check only occurs at initial key-on and the engine speed must be zero.

Component Location

The engine oil level sensor is located on the engine oil dipstick, on the air intake side of the
engine. Refer to Procedure 100-002 (Engine Diagrams) in section E for further details on
dipstick location.

Shop Talk

The engine oil level sensor shares supply and return wires in the engine harness with other
sensors. Opens and shorts in the engine harness can cause multiple fault codes to be
active. Before troubleshooting Fault Code 498, check for multiple faults.

Possible causes of this fault code include:

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z Open return circuit in the harness, connectors, or sensor

z Signal circuit shorted to sensor supply or battery voltage.

On-Board Diagnostics (OBD) Information:

z The ECM illuminates the appropriate amber or red fault lamp when the diagnostic
runs and fails
z The ECM turns off the appropriate fault lamp when the diagnostic runs and passes.

Cautions and Warnings

CAUTION
To reduce the possibility of damaging a new ECM, all other active fault
codes must be investigated prior to replacing the ECM.

CAUTION
To reduce the possibility of pin and harness damage, use the following
test leads when taking a measurement:
Part Number 3822758 - male Deutsch/AMP/Metri-Pack test lead
Part Number 3822917 - female Deutsch/AMP/Metri-Pack test lead.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the fault codes.
STEP 1A. Check for sensor Fault Code 227 active?
supply fault codes.
STEP 1B. Check for an inactive Fault Code 498 inactive?
fault code.
STEP 2. Check the engine oil level sensor
and circuit.
STEP 2A. Inspect the engine oil Dirty or damaged pins?
level sensor and connector pins.
STEP 2B. Check the circuit Fault Code 499 is active and fault
response. code 498 inactive?
STEP 2C. Check the sensor 4.75 to 5.25 VDC?
supply voltage and return circuit.
STEP 2D. Check the fault codes Fault code 498 active?
and verify sensor condition.
STEP 3. Check the ECM and engine
harness.

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STEP 3A. Inspect the ECM and Dirty or damaged pins?

engine harness connector pins.

STEP 3A-1. Check the ECM

response.
STEP 3A-2. Check for an active
fault code.
STEP 3B. Inspect engine control Dirty or damaged pins?
module and engine harness
connector pins.

STEP 3B-1. Check the sensor

supply voltage and return circuit.
STEP 3B-2. Check for an active
fault code.
STEP 4. Clear the fault codes.
STEP 4A. Disable the fault code. Fault Code 498 inactive?
STEP 4B. Clear the inactive fault All fault codes cleared?
codes.

Guided Step 1 - Check the fault codes

Guided Step 1A - Check for sensor supply fault codes.

Conditions

z Turn keyswitch ON
z Connect INSITE™ electronic
service tool.

Action

Check for sensor supply fault codes.

z Use INSITE™ to read the fault

codes.

Fault Code 227 active? Fault Code 227 active?

YES NO
No Repair No Repair

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Refer to Fault Code 227 Go to 1B

Guided Step 1B - Check for an inactive fault code.

Conditions

z Turn keyswitch ON
z Connect INSITE™ electronic
service tool.

Action

Check for inactive fault code.

z Use INSITE™ to read the fault

codes.

Fault code 498 is inactive? Fault code 498 is inactive?

YES NO
No Repair No Repair
Inactive or Intermittent Fault Code
Go to 2A
Procedure 019-362.

Guided Step 2 - Check the engine oil level sensor and

circuit.

Guided Step 2A - Inspect the engine oil level sensor and connector pins.

Conditions

z Turn keyswitch OFF.

z Disconnect the engine oil level
sensor from the engine harness.

Action

Inspec the engine harness and engine

oil level sensor connector pins for the
following:

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z Corroded pins
z Bent or broken pins
z Pushed back or expanded pins
z Wire insulation damage
z Moisture in or on the connector
z Missing or damaged connector
seals
z Connector shell broken
z Dirt or debris in or on the
connector pins

For general inspection techniques, refer

to Component Connector and Pin
Inspection, Procedure 019-361.

Dirty or damaged pins? Dirty or damaged pins?

YES NO
A defective connection has been detected No Repair
in the sensor or harness connector.

Clean the connector and pins.

Repair the damaged harness, connector,

or pins if possible.

Refer to Procedure 019-043.

Go to 4A Go to 2B

Guided Step 2B - Check the circuit response.

Conditions

z Turn keyswitch OFF.

z Disconnect the engine oil level
sensor from the engine harness.
z Turn keyswitch ON.
z Connect INSITE™ electronic
service tool.

Action

Check for the approriate circuit response

after 30 seconds.

z Using INSITE™ read the fault

codes.

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Fault code 499 is active and fault code Fault code 499 is active and fault code
498 is inactive? 498 is inactive?
YES NO
No Repair No Repair
Go to 2C Go to 3A

Guided Step 2C - Check the sensor supply voltage and return circuit.

Conditions

z Turn keyswitch OFF.

z Disconnect the engine oil
level sensor from the
engine harness.
z Turn keyswitch ON.

Action

Check the supply votage and

return circuit.

z Measure the voltage from

the ENGINE OIL LEVEL
+5 VOLT SUPPLY pin to
the ENGINE OIL LEVEL
RETURN pin at the sensor
connector of the engine
harness.

Refer to wiring diagram for

connector identification.

4.75 to 5.25 VDC? 4.75 to 5.25 VDC?

YES NO
No Repair No Repair
Go to 2D Go to 3B

Guided Step 2D - Check the fault codes and verify sensor condition

Conditions

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z Turn keyswitch OFF.

z Connect the engine oil level sensor
to the engine harness.
z Turn keyswitch ON.
z Connect INSITE™ electronic
service tool.

Action

Check for the approriate circuit response

after 30 seconds.

z Using INSITE™ read the fault

codes.

Fault code 498 is active? Fault code 498 is active?

YES NO
A defective sensor has been detected. The removal and reinstallation of the
connector corrected the failure.
Replace the oil level sensor.

Refer to procedure 019-056

Go to 4A Go to 4A

Guided Step 3 - Check the ECM and engine harness.

Guided Step 3A - Inspect the ECM and engine harness connector pins.

Conditions

z Turn keyswitch OFF.

z Disconnect the engine harness
from the ECM connector.

Action

Inspect the engine harness and ECM

connector pins for the following:

z Corroded pins
z Bent or broken pins
z Pushed back or expanded pins

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z Wire insulation damage

z Moisture in or on the connector
z Missing or damaged connector
seals
z Connector shell broken
z Dirt or debris in or on the
connector pins

For general inspection techniques, refer

to Component Connector and Pin
Inspection, Procedure 019-361.

Dirty or damaged pins? Dirty or damaged pins?

YES NO
A defective connection has been detected No Repair
in the ECM connector or the engine
harness connector.

Clean the connector and pins.

Repair the damaged harness, connector,

or pins if possible.

Refer to Procedure 019-043.

Go to 4A Go to 3A-1

Guided Step 3A-1 - Check the ECM response.

Conditions

z Turn keyswitch OFF

z Disconnect the engine harness
from the ECM
z Turn keyswitch ON
z Connect INSITE™ electronic
service tool.

Action

Check the appropriate circuit response

after 30 seconds.

z Using INSITE™, read the fault

codes.

Fault code 499 active and fault code 498 Fault code 499 active and fault code 498

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inactive? inactive?
YES NO
No Repair Call for pre-authorization.

Replace the ECM.

Refer to Procedure 019-031.

Go to 3A-2 Go to 4A

Guided Step 3A-2 - Check for an active fault code.

Conditions

z Connect all components.

z Turn keyswitch ON
z Connect INSITE™ electronic
service tool.

Action

Check the appropriate circuit response

after 30 seconds.

z Using INSITE™, read the fault

codes.

Fault code 498 active? Fault code 498 active?

YES NO
None. The removal and reinstallation of the A pin to pin short circuit has been detected
connector corrected the failure. on the signal line of the engine harness.

Repair or replace the engine harness.

Refer to Procedure 019-043.

Go to 4A Go to 4A

Guided Step 3B - Inspect engine control module and engine harness

connector pins.

Conditions

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z Turn keyswitch OFF.

z Disconnect the engine harness
from the ECM.

Action

Inspect the engine harness and engine

control module engine connector pins for
the following:

z Corroded pins
z Bent or broken pins
z Pushed back or expanded pins
z Wire insulation damage
z Moisture in or on the connector
z Missing or damaged connector
seals
z Connector shell broken
z Dirt or debris in or on the
connector pins

For general inspection techniques, refer

to Component Connector and Pin
Inspection, Procedure 019-361.

Dirty or damaged pins? Dirty or damaged pins?

YES NO
A defective connection has been detected No Repair
in the engine control module engine
connector or engine harness connector.

Clean the connector and pins.

Repair the damaged harness, connector or

pins if possible.

Refer to Procedure 019-043.

Go to 4A Go to 3B-1

Guided Step 3B-1 - Check the sensor supply voltage and return circuit

Conditions

z Turn
keyswitch
OFF

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z Disconnect
the engine
harness from
the ECM
engine
connector
z Turn
keyswitch
ON

Action

Check the supply

voltage and return
circuit.

z Measure the
voltage from
the ENGINE
OIL LEVEL
+5 VOLT
SUPPLY pin
to the
ENGINE OIL
LEVEL
RETURN pin
at the engine
control
module
engine
connector.

Refer to the wiring

diagram for
connector pin
identification.

4.75 to 5.25 VDC? 4.75 to 5.25 VDC?

YES NO
No Repair Call for pre-authorization.

Replace the ECM.

Refer to Procedure 019-031.

Go to 3B-2 Go to 4A

Guided Step 3B-2 - Check for an active fault code.

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Conditions

z Connect all components.

z Turn keyswitch ON
z Connect INSITE™ electronic
service tool.

Action

Check for the appropriate circuit

response after 30 seconds.

z using INSITE™ read the fault

codes.

Fault code 498 inactive? Fault code 498 inactive?

YES NO
None. The removal and reinstallation of the An open RETURN circuit has been
connector corrected the failure. detected in the engine harness.

Repair or replace the engine harness.

Refer to Procedure 019-043.

Go to 4A Go to 4A

Guided Step 4 - Clear the fault code.

Guided Step 4A - Disable the fault code.

Conditions

z Connect all components.

z Turn keyswitch ON.
z Connect INSITE™ electronic
service tool.

Action

Disable the fault code.

z Start the engine and let it idle for 1

minute.

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z Use INSITE™ to verify the fault

code is inactive.

Fault Code 498 inactive? Fault Code 498 inactive?

YES NO
No Repair No Repair
Go to 4B Go to 1A

Guided Step 4B - Clear the inactive fault codes.

Conditions

z Connect all components.

z Turn keyswitch ON.
z Connect INSITE™ electronic
service tool.

Action

Clear the inactive fault codes.

z Using INSITE™ erase the inactive

fault codes.

All fault codes cleared? All fault codes cleared?

YES NO
No Repair No Repair
Repair complete Appropriate troubleshooting steps

Last Modified: 02-Jun-2005

Copyright© 2005
Cummins, Inc.
All rights reserved

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