GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Riviera 🢒 DTC 🢒 DTC P1689 Traction Control Delivered Torque Output Circuit

Object Number: 248183 Size: SF
Fuel Control
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The Electronic Brake and Traction Control Module (EBTCM) controls the PWM signal on the Desired Torque circuit while monitoring the wheel speed sensors in order to detect slippage. The PCM monitors the PWM signal and reduces engine torque as needed by retarding ignition timing, decreasing boost duty cycle, increasing air/fuel ratio, or, in severe cases, shutting OFF up to three fuel injectors. The PCM sends a PWM signal to the Electronic Brake and Traction Control Module (EBTCM) on the delivered torque circuit informing the EBTCM of response made to the desired torque signal. A problem with the delivered torque circuit should cause DTC P1689 to set and traction control to be disabled. An ABS/TCS DTC may also be set. For further ABS/TCS DTC information, refer to Diagnostic System Check - ABS .

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC
    • The system has detected an improper voltage level on output circuit for the traction control delivered torque output circuit.
    • The above conditions exist for at least 30 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

Check for the following conditions:

    • Poor connection at the PCM.
        Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
    • Damaged harness.
        Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a digital multimeter connected between the Traction Control Delivered Torque control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the EBTCM. A change in voltage will indicate the location of the malfunction.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help you determine how often the condition that caused the DTC to set occurs. This may assist you in diagnosing the condition.

Test Description

The numbers below refer to the step numbers on the Diagnostic Table.

  1. Normally, the ignition feed voltage should be present on the control circuit with the PCM disconnected and the ignition turned ON.

    2.

  2. This step checks for a shorted component or a short to B+ on the control circuit. Either condition would result in a measured current of over 500 milliamps. Also checks for a component that is going open while being operated, resulting in a measured current of 0 milliamps.

    3.

  3. This step checks for a short to voltage on the control circuit.

    4.

  4. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, program the new PCM.

DTC P1689 -- TCS Delivered Torque Control Circuit

Step

Action

Value(s)

Yes

No

1

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

  1. Turn OFF the ignition.
  2. Disconnect the PCM.
  3. Turn ON the ignition.
  4. Use a J 39200 DMM in order to measure the voltage between the delivered torque control circuit at the PCM harness connector and ground.

Is voltage near the specified value?

B+

Go to Step 3

Go to Step 6

3

  1. Connect the J 39200 DMM to measure current between the delivered torque control circuit at the PCM harness connector and ground.
  2. Monitor the current reading on the J 39200 DMM for at least 2 minutes.

Does the current reading remain between the specified values?

0.001-0.5 Amp

(1-500 mA)

Go to Step 11

Go to Step 4

4

  1. Turn OFF the ignition.
  2. Disconnect the EBTCM (leave the PCM disconnected).
  3. Turn ON the ignition.
  4. Use the J 39200 DMM in order to measure voltage between the delivered torque control circuit and ground.

Is voltage at the specified value?

0 V

Go to Step 10

Go to Step 5

5

Locate and repair short to voltage in the delivered torque control circuit. Refer to Wiring Repairs .

Is action complete?

--

Go to Step 16

--

6
  1. Turn OFF the ignition.
  2. Check the ignition feed fuse for the EBTCM.

Is the fuse blown?

--

Go to Step 7

Go to Step 8

7
  1. Locate and repair short to ground in ignition feed circuit for the EBTCM. Refer to

    Cell 44: PWR, GND, and ABS Relays
    Object Number: 378091 Size: FS
    ABS Components
    ABS Description
    Cell 44: Stoplamp/BTSI Switch, Inlet/Outlet Solenoid Valve, and WHEEl Speed Sensors
    Handling ESD Sensitive Parts Notice
    Cell 14: G102, G104, G106, G110, and G301 (Battery Ground)
    Cell 14: G202 (Buick 1 of 3)
    Cell 14: G202 (Oldsmobile 2 of 3)
    Cell 14: G102, G104, G106, G110, and G301 (Battery Ground)
    Cell 50: Serial Data UART
    Cell 44: Stoplamp/BTSI Switch, Inlet/Outlet Solenoid Valve, and WHEEl Speed Sensors
    Cell 44: ABS and Traction Control Indicators
     .
  2. Replace the fuse.

Is action complete?

--

Go to Step 16

--

8
  1. Disconnect the EBTCM.
  2. Turn ON the ignition.
  3. Measure voltage between the ignition feed circuit for the EBTCM and ground.

Is voltage near the specified value?

B+

Go to Step 9

Go to Step 13

9
  1. Check the delivered torque control circuit for an open or a short to ground.
  2. If you find a problem, repair the delivered torque control circuit. Refer to Wiring Repairs .

Did you find and repair a problem?

--

Go to Step 16

Go to Step 10

10
  1. Check for the following conditions:
    2. • The delivered torque control circuit for a poor connection at the PCM.
    • The delivered torque control circuit for a poor connection at the EBTCM.
    • The EBTCM ignition feed circuit for a poor connection at the EBTCM.
  2. If you find a problem, replace loose terminals as necessary. Refer to Intermittents and Poor Connections Diagnosis and Repairing Connector Terminals .

Did you find a problem?

--

Go to Step 16

Go to Step 14

11
  1. Turn OFF the ignition.
  2. Reconnect the PCM.
  3. Disconnect the EBTCM.
  4. Turn ON the ignition.
  5. Connect a J 35616-200 test lamp between the delivered torque control circuit and the ignition feed circuit at the EBTCM harness connector.
  6. Use the scan tool outputs test function in order to cycle the delivered torque output ON and OFF.

Does the test lamp flash ON and OFF?

--

Go to Diagnostic Aids

Go to Step 12

12
  1. Check the delivered torque control circuit for a poor connection at the PCM.
  2. If you find a problem, replace the loose terminal. Refer to Intermittents and Poor Connections Diagnosis and Repairing Connector Terminals .

Did you find a problem?

--

Go to Step 16

Go to Step 15

13

Locate and repair open in ignition feed circuit to the EBTCM. Refer to Wiring Repairs .

Is the action complete?

--

Go to Step 16

--

14

Replace the EBTCM. Refer to Electronic Brake and Traction Control Module Replacement in ABS/TCS.

Is the action complete?

--

Go to Step 16

--

15

Important: The replacement PCM must be programmed.

Refer to Powertrain Control Module Replacement/Programming .

Replace the PCM.

Is the action complete?

--

Go to Step 16

--

16
  1. Review and record the scan tool Fail Records data.
  2. Clear the DTCs.
  3. Operate the vehicle within Fail Records conditions.
  4. Use a scan tool in order to monitor the Specific DTC info for DTC P1689 until the DTC P1689 test runs.

Does the scan tool indicate DTC P1689 failed this ignition?

--

Go to Step 2

System OK