Diagnostic Routine BG
Diagnostic Routine BG
Diagnostic Overview
The Low Oil Pressure Warning Indicator Is Never or Always On
Refer to Wiring Diagram Set 60 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
NOTE: If DTC (Diagnostic Trouble Code) U0100:00 sets in the IPC (Instrument Panel Cluster), other observable symptoms can be an inoperative speedometer, tachometer, temperature gauge or odometer.
REFER to Low Oil Pressure Warning Indicator .
If the IPC (Instrument Panel Cluster) fails to receive the oil pressure warning message from the BCM (Body Control Module) for less than 2 seconds, the IPC (Instrument Panel Cluster) defaults the low oil pressure warning indicator to the last state (on or off), based upon the last known good oil pressure status message.
If the BCM (Body Control Module) fails to receive the oil pressure warning message from the PCM (Powertrain Control Module) for 2 seconds or longer, the BCM (Body Control Module) and the IPC (Instrument Panel Cluster) sets DTC (Diagnostic Trouble Code) U0100:00 and the IPC (Instrument Panel Cluster) defaults the low oil pressure warning indicator on.
Visual Inspection and Diagnostic Pre-checks
- Inspect the engine for noise that can indicate a base engine or low engine oil pressure concern.
- Inspect the engine oil pressure switch for signs of external damage.
- Inspect the engine oil pressure switch connector for signs of corrosion and inspect the harness for damage indicating an open or short to ground.
Pinpoint Test
1. CHECK THE LOW OIL PRESSURE WARNING INDICATOR USING THE DEALER TEST MODE
1. Ignition OFF.
2. Enter the Dealer Test Mode. REFER to Dealer Test Mode .
3. Scroll to LED test.
4. Monitor the low oil pressure warning indicator.
Does the low oil pressure warning indicator illuminate?
2. RETRIEVE THE RECORDED DTCs (Diagnostic Trouble Codes) FROM THE IPC (Instrument Panel Cluster) SELF-TEST
1. Using a scan tool, perform a IPC (Instrument Panel Cluster) self-test.
Is DTC (Diagnostic Trouble Code) U0100:00 recorded?
3. CHECK FOR A STUCK CLOSED ENGINE OIL PRESSURE SWITCH
1. Ignition OFF.
2. Disconnect: Engine Oil Pressure Switch.
3. Ignition ON.
4. Observe the low oil pressure warning indicator.
Does the low oil pressure warning indicator turn off?
4. CHECK THE OIL PRESSURE INPUT CIRCUIT FOR A SHORT TO GROUND
1. Ignition OFF.
2. Disconnect: PCM (Powertrain Control Module) C175E.
3. Measure:
Is the resistance greater than 10,000 ohms?
5. RETRIEVE THE RECORDED DTCs (Diagnostic Trouble Codes) FROM THE PCM (Powertrain Control Module) KOEO (Key ON Engine OFF) SELF-TEST
1. Using a scan tool, perform a PCM (Powertrain Control Module) KOEO (Key ON Engine OFF) self-test.
Are any DTCs (Diagnostic Trouble Codes) recorded?
6. CHECK THE OIL PRESSURE
1. Test the engine for low oil pressure. REFER to Diagnostic Routine A: Low Oil Pressure .
Was a low oil pressure concern detected?
7. CHECK FOR A STUCK OPEN ENGINE OIL PRESSURE SWITCH
1. Ignition OFF.
2. Disconnect: Engine Oil Pressure Switch.
3. Connect a fused jumper wire:
4. Ignition ON.
5. Observe the low oil pressure warning indicator.
Does the low oil pressure indicator turn on?
8. CHECK THE ENGINE OIL PRESSURE INPUT CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Disconnect: PCM (Powertrain Control Module) C175E.
3. Measure:
Is the resistance less than 3 ohms?
9. CHECK FOR CORRECT PCM (Powertrain Control Module) OPERATION
1. Ignition OFF.
2. Disconnect and inspect all PCM (Powertrain Control Module) connectors.
3. Repair:
- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary
4. Reconnect the PCM (Powertrain Control Module) connectors. Make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present
Is the concern still present?
