GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 Engine 🢒 Engine Controls - 4.6L 🢒 Low Engine Oil Level Indicator Diagnosis

Object Number: 603444 Size: SF
Engine Controls Component Views
Generator, PCM, Steering Pressure Switch and Oil Level Switch
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The engine oil level (EOL) switch is a simple float-type switch. The switch grounds when the oil level is at the proper level. The PCM applies an ignition voltage to the switch input circuit through a pull-up resistor. With the ignition turned ON, and the engine OFF, the PCM should detect a low voltage input on the switch circuit. With test conditions met, the PCM should detect a transition from a low voltage to a high voltage input on the switch circuit.

The PCM also sends the oil level information via class 2 serial data to the Driver Information center (DIC). If the DIC detects a low oil level condition, the DIC display a low oil level message.

Diagnostic Aids

If the condition is intermittent, refer the Intermittent Conditions .

Step

Action

Value(s)

Yes

No

1

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

Is DTC P1617 set?

--

Go to DTC P1617 Engine Oil Level Switch Circuit

Go to Step 3

3

  1. Inspect for proper engine oil level using the oil level indicator. Fill or drain the engine oil as necessary.
  2. Observe the engine oil level display on the scan tool.

Does the engine oil level display indicate LOW ?

--

Go to Step 4

Go to Diagnostic Aids

4
  1. Turn OFF the ignition.
  2. Disconnect the oil level switch connector.
  3. Turn OF the ignition with the engine OFF.
  4. Using DMM J 39200, measure the voltage between the oil level switch input circuit and chassis ground.

Does the DMM display a voltage near the specified value?

5V

Go to Step 5

Go to Step 7

5
  1. Connect a jumper between the oil level switch input and the switch ground circuits in the connector.
  2. Observe oil level display on the scan tool.

Does the display indicate the engine oil is OK ?

--

Go to Step 8

Go to Step 6

6

Locate and repair the open or poor oil level switch ground circuit.

Is action complete?

--

Go to Step 11

--

7
  1. Turn OFF the ignition.
  2. Disconnect the PCM connector.
  3. Test the oil level switch input circuit for an open or poor connections at the PCM.
  4. If the condition is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 10

8
  1. Test for poor connections at the oil level switch.
  2. If the condition is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 9

9

Replace the engine oil level switch.

Is action complete?

--

Go to Step 11

--

10

Important: The replacement PCM must be programmed.

Replace the PCM. Refer to Powertrain Control Module Replacement/Programming .

Is action complete?

--

Go to Step 11

--

11

Install the scan tool.

Turn ON the ignition with the engine OFF.

Observe the oil level display on the scan tool.

Does the oil level display indicate OK?

--

Go to Step 12

Go to Step 2

12

Start and idle the engine.

Raise the engine speed to the specified RPM.

Does the oil level display indicate LOW?

--

System OK

Go to DTC P1617 Engine Oil Level Switch Circuit