Circuit Description
To determine the engine oil life remaining, the PCM monitors engine coolant temperature, the number of crankshaft revolutions, vehicle speed, engine speed, and calculated oil temperature. When the PCM determines that the engine oil is near the end of its useful life, it will command the cluster via serial data (CKT 800) to illuminate the Change Oil Soon indicator or Change Oil Soon/Now message after startup. The PCM will command the Change Oil Soon indicator or Change Oil Soon/Now message ON after each startup until the engine oil life monitor is reset by grounding the Oil Life Monitor reset circuit through the oil life monitor reset switch for longer than 5 seconds.
Conditions for Running the DTC
The ignition is on.
Conditions for Setting the DTC
The Oil Life Monitor reset circuit is grounded for over 60 seconds.
Action Taken When the DTC Sets
The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.
Conditions for Clearing the MIL/DTC
| • | The DTC becomes history when the conditions for setting the DTC are no longer present. |
| • | The history DTC clears after 40 malfunction free warm-up cycles. |
| • | The PCM receives a clear code command from the scan tool. |
Diagnostic Aids
An intermittent may be caused by rubbed through wire insulation. Check for the following conditions:
| • | Poor Connection or Damaged Harness: Inspect the PCM harness for a short to ground in the Oil Life Monitor reset circuit, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness. |
| • | Intermittent Test: Using a DMM to B+, observe voltage on the Oil Life Monitor reset circuit at the PCM connector while moving related connectors and wiring harness. If the failure is induced, the voltage will change. This may help to isolate the location of the malfunction. |
| • | DTC P1619 can be set by depressing the Oil Life Monitor Reset switch for an extended period of time. |
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic System Check performed? | -- | ||
2 |
Does Oil Life Switch display Pressed? | -- | Go to Diagnostic Aids | |
Is the test lamp ON? | -- | |||
Is the test lamp ON? | -- | |||
5 | Locate and repair short to ground in the Oil Life Monitor Reset circuit. Refer to Wiring Repairs . Is the action complete? | -- | -- | |
6 |
Important: The replacement PCM must be reprogrammed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete? | -- | -- | |
7 | Replace the Oil Life Monitor Reset switch. Refer to Instrument Panel Storage Compartment Replacement . Is the action complete? | -- | -- | |
8 |
Does Oil Life Switch display Pressed? | -- | System OK |
