GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century 🢒 DTC 🢒 DTC P1814 Torque Converter Overstressed

Object Number: 360661 Size: LF
Automatic Transmission Components
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice

Circuit Description

This diagnostic test checks for unusually high throttle angle and low vehicle speed when the transmission is in Drive or Reverse. The primary purpose of this DTC is to record the Failure Record Data, because this condition could damage the powertrain or create an unsafe condition.

If the PCM detects an unusually high throttle angle and low vehicle speed when the transmission is in a drive range, then DTC P1814 sets.

DTC P1814 is a Type D DTC.

Conditions for Running the DTC
    • No TP DTCs P0121, P0122, or P0123.
    • No VSS DTCs P0502 or P0503.
    • The vehicle speed is less than 10 km/h (7 mph).
    • System voltage is 10-18 volts.
    • The transmission range is not Park or Neutral.
    • The throttle angle is 70 percent or greater.
    • These conditions must occur for 12 seconds.

Conditions for Setting the DTC

DTC P1814 will set if TCC slip speed is greater than 2200 RPM for 12 seconds.

Action Taken When the DTC Sets

The PCM does not illuminate the malfunction indicator lamp (MIL).

Conditions for Clearing the DTC
    • A scan tool clears the DTC from PCM history.
    • The PCM clears the DTC from the PCM history if the vehicle completes 40 consecutive warm-up cycles without a non-emission related diagnostic fault occurring.
    • The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

Diagnostic Aids

A high throttle angle with the brakes applied (stall test) may cause DTC P1814 to set.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step inspects the failure records for DTC P1814 occurrences.

DTC P1814 Torque Converter Overstress

Step

Action

Value(s)

Yes

No

1

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

  1. Install the Scan Tool .
  2. With the engine OFF, turn the ignition switch to the RUN position.

    3. Important: Before clearing the DTC, use the scan tool in order to record the Failure Records. Using the Clear Info function erases the stored Failure Records from the PCM.

  3. Record the Failure Records, then clear the DTC.
  4. Inspect the transmission fluid level and color.

    5. Refer to Transmission Fluid Check .

Is the inspection complete?

--

Go to Step 3

--

3

Perform the following in order to verify the repair:

  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle under the following conditions:
    4. • Road test the vehicle with the range selector in D4.
       - The TCC slip must be less than 1500 RPM.
       - The TP Angle must be less than 50°.
       - The vehicle speed must be greater than 10 km/h (7 mph).
    • These conditions must persist for more than 7 seconds.
  4. Select Specific DTC.
  5. Enter DTC P1814.

Has the test run and passed?

--

System OK

Go to Step 1