GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1996 🢒 Regal 🢒 DTC 🢒 DTC P1672 Low Engine Oil Level Lamp Control Circuit

Refer to

GEN Control, Low Oil Lamp, Volts Lamp


Object Number: 23213 Size: FS
Engine Controls Components
Powertrain Control Module Controlled Warning Lamps Diagnosis
A/C Control
TCC Brake Switch, TCC Solenoid
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
 .

Circuit Description

Output Driver Modules (ODMs) are used by the PCM to turn ON many of the current-driven devices that are needed to control various engine and Transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON.

Unlike the Quad Driver Modules (QDMs) used in prior model years, ODMs have the capability of diagnosing each output circuit individually. DTC P1672 set indicates an improper voltage level has been detected on ODM D output 2, which controls the Low Engine Oil Level Lamp.

Conditions for Setting the DTC
    • Ignition is ON.
    • An improper voltage level has been detected on ODM D output 2 (the low engine oil level lamp control circuit).
    • Above conditions for at least 30 seconds.

Action Taken When the DTC Sets
    • The PCM will not illuminate the MIL.
    • The PCM will store conditions which were present when the DTC set as Fail Records data only. This information will not be stored as Freeze Frame data.

Conditions for Clearing the MIL/DTC
    • A history DTC P1672 will clear after 40 consecutive warm-up cycles have occurred without a fault.
    • DTC P1672 can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Chart.

  1. Normally, ignition feed voltage should be present on the output driver circuit with the PCM disconnected and the ignition turned ON.

    2.

  2. Checks for a shorted component or a short to B+ on the output driver circuit. Either condition would result in a measured current of over 500 milliamps. Also checks for a component that is going open while being operated, resulting in a measured current of 0 milliamps.

    3.

  3. Checks for a short to voltage on the low engine oil level lamp control circuit.

    4.

  4. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.

DTC P1672 - Low Engine Oil Level Lamp Control Circuit

Step

Action

Value(s)

Yes

No

1

Was the Powertrain On-Diagnostic System Check performed?

--

Go to Step 2

Go to the Powertrain On Board Diagnostic (OBD) System Check

2
  1. Turn OFF the ignition switch.
  2. Disconnect the PCM.
  3. Turn ON the ignition switch.
  4. Using a J 39200 digital mulitimeter, measure voltage between the low engine oil level lamp control circuit at the PCM harness connector and ground.

Is voltage near the specified value?

B+

Go to Step 3

Go to Step 6

3
  1. Connect the digital multimeter to measure current between the low engine oil level lamp control circuit at the PCM harness connector and ground.
  2. Monitor the current reading on the digital multimeter for at least 2 minutes.

Does the current reading remain between the specified values?

0.05-0.5 Amp

(50-500 mA)

Go to Step 11

Go to Step 4

4
  1. Turn OFF the ignition switch.
  2. Disconnect the instrument panel (leave the PCM disconnected).
  3. Turn ON the ignition switch.
  4. Measure voltage between the low engine oil level lamp control circuit at the PCM harness connector and ground.

Is voltage at the specified value?

0 V

Go to Step 10

Go to Step 5

5

Locate and repair short to voltage in the low engine oil level lamp control circuit (refer to Repair Procedures in Electrical Diagnosis Section 8A-5).

Is action complete?

--

Go to Step 15

--

6

Check the ignition feed fuse for the instrument panel indicators.

Is the fuse blown?

--

Go to Step 7

Go to Step 8

7
  1. Locate and repair short to ground in ignition feed circuit for the instrument panel indicators (refer to Fuse Block Details in Electrical Diagnosis).
  2. Replace fuse.

Is action complete?

--

Go to Step 15

--

8
  1. Disconnect the instrument cluster.
  2. Turn ON the ignition switch, measure voltage between the ignition feed circuit for the instrument cluster indicators and ground.

Is voltage near the specified value?

B+

Go to Step 9

Go to Step 13

9
  1. Check the low engine oil level lamp control circuit for an open or a short to ground.
  2. If a problem is found, repair the low engine oil level lamp control circuit (refer to Repair Procedures in Electrical Diagnosis Section 8A-5).

Was a problem found?

--

Go to Step 15

Go to Step 10

10
  1. Check the low engine oil level lamp control circuit and the instrument panel indicators ignition feed circuit for a poor connection at the instrument panel and at the PCM.
  2. If a problem is found, replace faulty terminal(s) (refer to Repair Procedures in Electrical Diagnosis Section 8A-5).

Was a problem found?

--

Go to Step 15

Go to Instrument Panel in Electrical Diagnosis

11
  1. Turn OFF the ignition switch.
  2. Reconnect the PCM.
  3. Disconnect the instrument cluster.
  4. Turn ON the ignition switch.
  5. Connect a test light between the low engine oil level lamp control circuit and the ignition feed circuit at the instrument panel harness connector.
  6. Using the scan tool outputs test function, cycle the low engine oil level lamp ON and OFF.

Does the test light flash ON and OFF?

--

Refer to Diagnostic Aids

Go to Step 12

12
  1. Check the low engine oil level lamp control circuit for a poor connection at the PCM.
  2. If a problem is found, replace faulty terminal (refer to Repair Procedures in Electrical Diagnosis Section 8A-5).

Was a problem found?

--

Go to Step 15

Go to Step 14

13

Locate and repair open in the ignition feed circuit to the I/P indicators (refer to Repair Procedures in Electrical Diagnosis Section 8A-5).

Is action complete?

--

Go to Step 15

--

14

Replace the PCM.

Important: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .

Is action complete?

--

Go to Step 15

--

15
  1. Review and record scan tool Fail Records data.
  2. Clear DTCs.
  3. Operate the vehicle within Fail Records conditions.
  4. Using a scan tool, monitor Specific DTC info for DTC P1672 until the DTC P1672 test runs.

Does the scan tool indicate DTC P1672 failed this ign?

--

Go to Step 2

System OK