DTC P1886 Non-European Emissions
Circuit Description
The 4HP 16 Auto Transaxle operates without freewheels. Shifting between individual gears takes place by means of overlapping clutch engagement and release.
The advantages of overlap shifting include the following features:
| • | The transaxle can be more compactly designed and lighter because of the absence of freewheels and the lower number of shift elements. |
| • | Lower drag losses, resulting in higher efficiency. |
| • | Lower peak torque acting on the components and the driveline. |
However, overlap shifting requires high-performance hardware and software and precision engine signals.
Conditions for Setting the DTC
| • | The transmission oil temperature is greater than -10°C (14°F). |
| • | The selector lever is not in Neutral or Park position. |
| • | System voltage is greater than 9 volts. |
| • | No input speed error DTCs P0715, P0716, or P0717. |
| • | Output speed is greater than 256 RPM. |
| • | Input speed is greater than 400 RPM. |
| • | The 4-2 gear shift is active. |
| • | Immediately after the above condition occurs. |
Action Taken When the DTC Sets
| • | The hold lamp will blink. |
| • | The transmission control module (TCM) will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer. |
| • | Adopt Emergency/ Substitute mode and constant 4th gear. |
| • | Open lock-up clutch. |
Conditions for Clearing the Hold Lamp/DTC
| • | The hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycle. |
| • | A history DTC will clear after 40 consecutive warm up cycles without a fault. |
| • | Using a scan tool can clear history DTCs. |
Diagnostic Aids
When DTC P1886 sets, the possible cause of fault could be TCM.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 3 |
3 | Inspect the ECM. Refer to Diagnostic Starting Point - Engine Controls in Engine Controls -1.6L or to Diagnostic Starting Point - Engine Controls in Engine Controls - 1.8L. Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 4 |
4 |
Is the voltage within the specified value? | 11-14V | Go to Step 5 | |
5 | Replace the TCM. Refer to Transmission Control Module Replacement . Is the action complete? | -- | Go to Step 6 | -- |
6 |
Has the last test failed or is the current DTC displayed? | -- | Go to Step 7 | System OK |
7 | Replace the transaxle assembly. Refer to Transmission Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Has the last test failed or is the current DTC displayed? | -- | Go to Step 2 | System OK |
DTC P1886 EuropeanEmissions
Circuit Description
The 4HP 16 Auto Transaxle operates without freewheels. Shifting between individual gears takes place by means of overlapping clutch engagement and release.
The advantages of overlap shifting include the following features:
| • | The transaxle can be more compactly designed and lighter because of the absence of freewheels and the lower number of shift elements. |
| • | Lower drag losses, resulting in higher efficiency. |
| • | Lower peak torque acting on the components and the driveline. |
However, overlap shifting requires high-performance hardware and software and precision engine signals.
Conditions for Setting the DTC
| • | The transmission oil temperature is greater than -10°C (14°F). |
| • | The selector lever is not in Neutral or Park position. |
| • | System voltage is greater than 9 volts. |
| • | No input speed error DTCs P0715, P0716, or P0717. |
| • | Output speed is greater than 256 RPM. |
| • | Input speed is greater than 400 RPM. |
| • | The 4-2 gear shift is active. |
| • | Immediately after the above condition occurs. |
Action Taken When the DTC Sets
| • | The malfunction indicator lamp (MIL) will illuminate. |
| • | The transmission control module (TCM) will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer. |
| • | Adopt Emergency/ Substitute mode and constant 4th gear. |
| • | Open lock-up clutch. |
Conditions for Clearing the MIL/DTC
| • | The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle. |
| • | A history DTC will clear after 40 consecutive warm up cycles without a fault. |
| • | Using a scan tool can clear history DTCs. |
Diagnostic Aids
When DTC P1886 sets, the possible cause of fault could be TCM.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 3 |
3 | Inspect the ECM. Refer to Diagnostic Starting Point - Engine Controls in Engine Controls -1.6L or to Diagnostic Starting Point - Engine Controls in Engine Controls - 1.8L. Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 4 |
4 |
Is the voltage within the specified value? | 11-14V | Go to Step 5 | |
5 | Replace the TCM. Refer to Transmission Control Module Replacement . Is the action complete? | -- | Go to Step 6 | -- |
6 |
Has the last test failed or is the current DTC displayed? | -- | Go to Step 7 | System OK |
7 | Replace the transaxle assembly. Refer to Transmission Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Has the last test failed or is the current DTC displayed? | -- | Go to Step 2 | System OK |
