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Trouble Code: P0700 (3.2L V6 VIN N Auto)Malfunction Indicator Lamp Circuit Malfunction (TCM) Print this code data

OBD II Monitor Type: CCM DetailsIndicators: MIL Details

CCM Details MIL Details

Trouble Code Conditions:Key on or engine running; and the PCM received a signal from the TCM requesting that the Malfunction Indicator Lamp be illuminated.

Possible Causes: MIL control circuit is shorted to ground Check the TCM for any trouble codes in memory

that are responsible for the request to turn on the MIL

TCM has failed2003 Cadillac CTS - Powertrain - Engine Controls - 2.6L and 3.2L - DTC P0700

PATH: Diagnostics > Diagnostic Routines > Powertrain > Engine Controls - 2.6L and 3.2L > DTC P0700

DTC P0700

NOTE

Applicable vehicles: CTS (VIN D)

DTC P0700 Circuit DescriptionThis diagnostic trouble code (DTC) indicates that an emissions related transmission fault has occurred. The transmission control module (TCM) has no direct control of the malfunction indicator lamp (MIL), but if a transmission fault occurs that is emissions related, the MIL must illuminate. The TCM transmits a MIL request signal over the CAN bus to the ECM and the ECM will turn ON the MIL. This allows the MIL to illuminate, even though the fault was detected by the TCM. If a TCM MIL request signal is received by the ECM, P0700 will set.Conditions for Running the DTCTested continuously

Conditions for Setting the DTCAn emission related transmission DTC has been stored by the TCM.Action Taken When the DTC Sets

The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

Conditions for Clearing the MIL/DTC The control module turns OFF the malfunction

indicator lamp (MIL) after 6 consecutive ignition cycles that the diagnostic runs and does not fail.

A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

Clear the MIL and the DTC with a scan tool.

Step Action Yes No

1 Did you perform the Diagnostic System Check-Engine Controls? Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

Observe the DTC Information with a scan tool.Does the scan tool display any ECM DTCs other than P0700?

Go to Diagnostic Trouble Code

(DTC) List

Go to Diagnostic System Check - Automatic

Transmission in Automatic Transmission 5L40E

Trouble Code: P1779 (3.2L V6 VIN N Auto)Incorrect or Invalid Torque Signal to the TCM Print this code data


Trouble Code Conditions: The ignition voltage is 8-18 volts.

The engine run time is greater than 5 seconds. No other CAN errors are present.

Possible Causes: (n/a) 2003 Cadillac CTS - Powertrain - Automatic Transmission - 5L40-E - DTC P1779

PATH: Diagnostics > Diagnostic Routines > Powertrain > Automatic Transmission - 5L40-E > DTC P1779

DTC P1779

NOTE


DTC P1779 Circuit DescriptionEngine torque information is sent to the transmission control module (TCM) by the engine control module (ECM) through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM. A fault in the CAN will not cause DTC P1779 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P1779. When the ECM sends the TCM an engine torque signal that is invalid, DTC P1779 will set. DTC P1779 is a type B DTC.Conditions for Running the DTC

The ignition voltage is 8-18 volts. The engine run time is greater than 5 seconds. No other CAN errors are present.

Conditions for Setting the DTCEngine torque signal is below the lower limit, above the upper limit, or is an unreliable value for 2 seconds.Action Taken When the DTC Sets

The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.

The TCM turns off the pressure control solenoid. When the pressure control solenoid is off, line pressure is at maximum and updates to the transmission adaptive pressure (TAP) memory cells are discontinued.

At the time of the first failure, the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record.

At the time of the second failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.

The TCM stores DTC P1779 in TCM history.Conditions for Clearing the DTC

The ECM turns OFF the MIL after the sixth consecutive drive trip in which the TCM does not send a MIL illumination request.

A scan tool can clear the DTC. The TCM clears the DTC from TCM history if the

vehicle completes 40 warm-up cycles without a non emission related diagnostic fault occurring.

The TCM cancels the DTC default actions when the ignition is OFF long enough in order to power down the TCM.

Step Action Value(s) Yes No

1

Did you perform the Diagnostic System Check - Engine Controls?

--

Go to Step 2

Go to Diagnostic

System Check - Engine

Controls in Engine

Controls - 2.6L and

3.2L

2 1. Install a scan tool.

2. Turn ON the ignition with the engine OFF.

WARNING

Important:

-- Go to Diagnostic

Trouble Code

(DTC) List in Engine

Controls - 2.6L and

3.2L

Go to Step 3


Before clearing the DTC, use the scan tool in order to record the ECM Freeze Frame and the TCM Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the ECM and the TCM.

Using the Clear Info function


erases stored DTCs in both the ECM and TCM.

22 Record the DTC Failure Records.

Did you record any ECM Failure Records?

3

1. Clear the DTC.2. Turn the ignition

OFF for at least 30 seconds.

3. Start, and allow the engine to idle.

Did DTC P1779 reset?

--

Go to Step 4

Go to Intermittent Conditions in Engine Controls - 2.6L and

3.2L

4

Did any other DTCs set?

--

Go to Diagnostic

Trouble Code


Controls- 2.6L and

3.2L Go to Step 5

5

Replace the TCM. Refer to Transmission Control Module Replacement .Is the action complete?

--Go to Step

6

--

6 Perform the following operation to verify the repair:

1. Select DTC on the scan tool.

-- Go to Step 7

Go to Step 2


2. Select Clear Info.

3. Start, and idle the engine.

4. Select Specific DTC.

5. Enter DTC P1779.

Has the test run and passed?

7

With the scan tool, observe the stored information, capture info and DTC info.Does the scan tool display any DTCs that you have not diagnosed?

--

Go to Diagnostic

Trouble Code


Controls - 2.6L and

3.2L System OK

Trouble Code: P1795 (3.2L V6 VIN N Auto)Throttle Plate Position Invalid Data Received Print this code data



Trouble Code Conditions:Engine started, system voltage at 8-18v, no other CAN codes set, and the TCM received invalid throttle plate position data from the PCM for 2 seconds. The PCM sends throttle plate position data to the TCM. The data is sent to the TCM via the CAN. Two circuits are used to communicate CAN data between the PCM and TCM. A fault in the CAN will not cause DTC P1795 to set by itself. If a CAN fault occurs, other codes will set before DTC P1795. The TCM sets this code if it receives invalid throttle plate position data from the PCM.

Possible Causes: Perform the Diagnostic System Check for the Engine

Controls

TCM may need to be replaced to repair this trouble code

2003 Cadillac CTS - Powertrain - Automatic Transmission - 5L40-E - DTC P1795

PATH: Diagnostics > Diagnostic Routines > Powertrain > Automatic Transmission - 5L40-E > DTC P1795

DTC P1795

NOTE


DTC P1795 Circuit DescriptionThe engine control module (ECM) sends throttle plate position data to the transmission control module (TCM). The data is sent to the TCM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM. A fault in the CAN will not cause DTC P1795 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P1795.When the TCM receives invalid throttle plate position data from the ECM, then DTC P1795 will set. DTC P1795 is a type B DTC.Conditions for Running the DTC

The ignition voltage is 8-18 volts. The engine run time is greater than 6 seconds. No other CAN errors present.

Conditions for Setting the DTCThe TCM receives no valid throttle plate position data from the ECM for 2.0 seconds.Action Taken When the DTC Sets

The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.

The TCM turns off the pressure control solenoid. When the pressure control solenoid is off, line pressure is at maximum and updates to the transmission adaptive pressure (TAP) memory cells are discontinued.

The TCM uses the ECM default throttle plate position value for determining shift speeds.

At the time of the first failure, the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record.

At the time of the second failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.

The TCM stores DTC P1795 in TCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.

Conditions for Clearing the DTC The ECM turns OFF the MIL after the sixth

consecutive drive trip in which the TCM does not send a MIL illumination request.

A scan tool can clear the DTC. The TCM clears the DTC from TCM history if the

vehicle completes 40 warm-up cycles without a non emission related diagnostic fault occurring.

The TCM cancels the DTC default actions when the ignition is OFF long enough in order to power down the TCM.


1

Did you perform the Diagnostic System Check - Engine Controls?

--

Go to Step 2

Go to Diagnostic


Controls in Engine

Controls - 2.6L and

3.2L

2

1. Install a scan tool.

2. Turn ON the ignition with the engine OFF.

--

Go to Diagnostic

Trouble Code

(DTC) List in Engine Go to Step 3


WARNING

Important: Before

clearing the DTC, use the scan tool in order to record the ECM Freeze Frame and the TCM Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the ECM and the TCM.

Using

Controls - 2.6L and

3.2L


the Clear Info function erases stored DTCs in both the ECM and TCM.

22 Record the DTC Failure Records.

Did you record any ECM Failure Records?

3

1. Clear the DTC.2. Turn the ignition

OFF for at least 30 seconds.


Did DTC P1795 reset?

--

Go to Step 4

Go to Intermittent Conditions in Engine Controls - 2.6L and

3.2L

4

Did any other DTCs set?

--

Go to Diagnostic

Trouble Code


Controls - 2.6L and

3.2L Go to Step 5

5

Replace the TCM. Refer to Transmission Control Module Replacement .Is the action complete?

--Go to Step

6

--


6

Perform the following operation to verify the repair:

1. Select DTC on the scan tool.

2. Select Clear Info.


4. Select Specific DTC.

5. Enter DTC P1795.

Has the test run and passed?

--

Go to Step 7 Go to Step 2

7

With the scan tool, observe the stored information, capture info and DTC info.Does the scan tool display any DTCs that you have not diagnosed?

--

Go to Diagnostic

Trouble Code


Controls - 2.6L and

3.2L System OK

Trouble Code: P2176 (3.2L V6 VIN N Auto)Throttle Position Sensor Minimum Position Not Detected Print this code data



Trouble Code Conditions:DTC P0121, P0122, P0123, P0221, P0222 and P0223 not set, key on, engine speed less than 40 rpm, system voltage over 10v, ECT sensor from 41-185ºF, IAT sensor less than 122ºF, accelerator pedal position under 15%, VSS less than 0 mph, and the PCM could not determine the minimum throttle position. The PCM controls the throttle blades by applying a varying voltage to the throttle valve motor. The PCM monitors

the actual throttle blade position using throttle position (TP) Sensor 1 and 2. If the PCM cannot detect the minimum throttle position, DTC P2176 is set.

Possible Causes: TAC motor control circuit (one or more) open or

shorted to B+ TAC motor control circuit (one or more) shorted to

ground Throttle valves not at the "rest" position Throttle valve are binding open, or are binding

closed Throttle valves moving open or closed without

spring pressure TP connector is damaged, open or shorted Throttle body assembly is damaged or it has failed PCM has failed

2003 Cadillac CTS - Powertrain - Engine Controls - 2.6L and 3.2L - DTC P2176

PATH: Diagnostics > Diagnostic Routines > Powertrain > Engine Controls - 2.6L and 3.2L > DTC P2176

DTC P2176

NOTE


DTC P2176 Circuit DescriptionThe engine control module (ECM) controls the throttle blades by applying a varying voltage to the throttle valve motor. The ECM monitors the actual throttle blade position using throttle position (TP) sensor 1 and 2. If the ECM cannot detect the minimum throttle position, DTC P2176 sets.Conditions for Running the DTC

The vehicle speed is 0 km/h (0 mph). The engine speed is less than 40 RPM. The engine coolant temperature (ECT) is between 5-

85°C (41-185°F). The intake air temperature (IAT) is less than 50°C

(122°F).

The battery voltage is more than 10 volts. The accelerator pedal position (APP) is less than 15

percent.Conditions for Setting the DTCThe control module can not determine the minimum throttle position.Action Taken When the DTC Sets

The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.

The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC The control module turns OFF the malfunction

indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

Clear the MIL and the DTC with a scan tool.Diagnostic Aids

Inspect for a condition in which the throttle valves may be held open.

Inspect for conditions in which ice may have formed in the throttle bore.

The throttle valves are spring loaded to a slightly open position. The throttle valves should be open approximately 3-5 percent. This is referred to as the rest position. The throttle valves should not be completely closed, nor should they be open any more than the specified amount. The throttle valves should move open and to the closed position without binding under the normal spring pressure. The throttle should NOT be free to move open or closed WITHOUT spring pressure.

WARNING

Important: Operating the throttle blade with the Throttle Blade Control function of the scan tool may cause additional DTCs to set. DO NOT attempt to diagnose DTCs set during this function.

The scan tool has the ability to operate the throttle control system using Special Functions. Actuate the throttle valves using the Throttle Position function located in the TAC system menu. This function will operate the throttle valve through the entire range in order to determine if the throttle body and system operate correctly.For intermittent conditions, refer to Intermittent Conditions .Test DescriptionThe numbers below refer to the step numbers on the diagnostic table.

4. The throttle valves are spring loaded in a slightly open position and should move in either direction without binding. The throttle valves should always be under spring pressure.

7. When the ignition is turned ON, the ECM operates the throttle control motor to verify the integrity of the system prior to start-up. This can be seen by the momentary flash of the test lamp as the ignition is turned ON.

Step Action Values Yes No

Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views

1

Did you perform the Diagnostic System Check-Engine Controls?

--

Go to Step 2

Go to Diagnostic


Controls

2

Observe the DTC information with a scan tool.Are DTCs P0121, P0122, P0123, P0221, P0222, P0223 also set?

--

Go to Diagnostic

Trouble Code

(DTC) List Go to Step 3

3 1. Perform the idle learn procedure.

-- Go to Step 4

Go to Step 14


Refer to Idle Learn .

2. Clear the DTCs with a scan tool.

3. Turn OFF the ignition for 30 seconds.

4. Start the engine.5. Operate the

vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records .

Did DTC P2176 fail since code clear?

4 1. Turn OFF the ignition.

2. Visually inspect the throttle body for the following conditions:

Throttle valves that are NOT in the rest position

Throttle valves that are binding open or closed

Throttle valves that are free to

-- Go to Step 12

Go to Step 5


move open or closed WITHOUT spring pressure. Refer to Diagnostic Aids.

Did you find any of these conditions with the throttle body?

5

WARNING

Important: Disconnecting the throttle body connector will cause additional codes to set.

1. Disconnect the throttle body connector.

2. Turn ON the ignition, with the engine OFF.

3. Measure the voltage of the TAC motor control 1 and the TAC motor control 2 circuits of the throttle actuator motor with a DMM connected to ground.

Is the voltage within the specified range for both circuits?

2.5-4.5 V

Go to Step 7 Go to Step 6

6 Is the voltage less than the specified value for either circuit? 2 V Go to Step

9 Go to Step 8

7 1. Turn OFF the ignition.

-- Go to Step 10

Go to Step 11


2. Connect the test lamp between the TAC motor control 1 and the TAC motor control 2 circuits.

3. Observe the test lamp as you turn ON the ignition.

Does the test lamp flash ON and then turn OFF?

8

Test the TAC motor control circuit that measured above the specified value for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.Did you find and correct the condition?

--

Go to Step 14

Go to Step 11

9

Test the TAC motor control circuit that measured below the specified value for an open or for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.Did you find and correct the condition?

--

Go to Step 14

Go to Step 11

10

Test for an intermittent and for a poor connection at the throttle body harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.Did you find and correct the condition?

--

Go to Step 14

Go to Step 12

11 Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to

-- Go to Step 14

Go to Step 13


Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.Did you find and correct the condition?

12

Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement .Did you complete the replacement?

--Go to Step

14 --

13

Replace the ECM. Refer to Engine Control Module Replacement .Did you complete the replacement?

--Go to Step

14 --

14

1. Clear the DTCs with a scan tool.

2. Turn OFF the ignition for 30 seconds.

3. Start the engine.4. Operate the

vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

--

Go to Step 2

Go to Step 15

15 Observe the Capture Info with a scan tool.Are there any DTCs that have not been diagnosed?

-- Go to Diagnostic

Trouble Code

System OK


(DTC) List

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