Step
| Action
| Value(s)
| Yes
| No
|
DEFINITION:
Low or no engine oil pressure indicates a potentialy serious condition with
all of the engine mechanical components. Once the cause of the low or no
oil pressure condition has been identified, repair all collateral damage
to the engine mechanical components as well as the initial cause of the
condition.
|
1
| Check engine oil level. Use only the GM service parts brand and recommended
grade of engine oil specified for the vehicle. Refer to Owners' Manual.
Is the engine oil level between ADD and FULL on the oil level indicator?
| --
|
Go to Step 2
| --
|
2
|
- Operate vehicle until engine reaches normal operating temperature.
Refer to
Engine Mechanical Specifications
.
- Park vehicle on a level surface.
- Wait (15 minutes).
- Check engine oil level. Use only the GM service parts brand and
recommended grade of engine oil specified for the vehicle. Refer to Owners'
Manual.
Is the engine oil level between ADD and FULL on the oil level indicator?
| --
|
Go to Step 3
| --
|
3
| Operate
the engine and measure the engine oil pressure with the vehicle gauge or light.
Refer to
Engine Mechanical Specifications
.
Is engine oil pressure within specification?
| --
| System OK
|
Go to Step 4
|
4
|
- Remove the oil pressure sender or engine block oil gallery plug.
- Install a mechanical oil pressure gauge.
- Operate the engine and measure the engine oil pressure with the
mechanical oil pressure gauge. Refer to
Engine Mechanical Specifications
.
Is engine oil pressure within specification?
| --
| System OK
|
Go to Step 5
|
5
| Change the engine oil and filter.
• | Use only the GM service parts brand and recommended grade of engine
oil specified for the vehicle. Refer to Owners' Manual. |
• | Use only the GM service parts brand and recommended type of engine
oil filter specified for the vehicle. Refer to Owners' Manual. |
Operate the engine and measure the engine oil pressure with the mechanical
oil pressure gauge. Refer to
Engine Mechanical Specifications
.
Is engine oil pressure within specification?
| --
| System OK
|
Go to Step 6
|
6
|
- Inspect the engine for mechanical damage. Special intrest should
be shown to the following areas:
• | Twisted oil cooler lines. |
• | Malfunctioning oil bypass valve |
• | Oil pump-to-engine block bolts loose |
• | Oil pump screen loose, plugged, or damaged |
• | Oil pump screen O-ring seal missing or damaged |
• | Malfunctioning oil pump pressure regulator valve |
• | Excessive bearing clearance |
• | Cracked, porous or restricted oil galleries |
• | Oil gallery plugs missing or incorrectly installed |
• | Damaged or missing oil spray cooling nozzles |
- Inspect the engine for customer modifications.
Is there mechanical damage, or customer modifications to the engine?
| --
|
Go to Step 7
|
Go to Step 1
|
7
| Repair
or replace all damaged or modified components.
Is the repair complete?
| --
|
Go to Step
1
| --
|