Circuit Description
The PCM controls the change oil soon indicator when it determines that the engine oil life has decreased to a certain level. DTC P1663 will set when the PCM detects an improper voltage level on the control circuit of the change oil soon indicator.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The system voltage is between 9.0 and 16.0 volts. |
Conditions for Setting the DTC
| • | The PCM detects an improper voltage level at the control circuit of the change oil soon indicator. |
| • | The above condition is present for at least 30 seconds. |
Action Taken When the DTC Sets
The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC
| • | A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The PCM receives the clear code command from the scan tool. |
Diagnostic Aids
| • | Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature, etc.). This will isolate when the DTC failed. |
| • | Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Driver Information System Schematics | |||
1 | Did you perform the DIC Diagnostic System Check? | Go to Step 2 | |
2 |
Does the lamp turn on and off with each command? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp turn on and off? | Go to Step 5 | Go to Step 4 |
4 | Test the signal circuit of the change oil soon indicator for an open, for a short to ground, or for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
5 | Inspect for poor connections at the harness connector of the DIC. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
7 | Replace the DIC. Refer to Driver Information Center Module Replacement . Did you complete the replacement? | Go to Step 9 | -- |
8 |
Important: : Program the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls (3.1L) or Powertrain Control Module Replacement in Engine Controls (3.8L). Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
