For 1990-2009 cars

## DTC P1860 TCC PWM Solenoid Circuit Electrical 2.4L

Automatic Transmission Components
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

### Circuit Description

The torque converter clutch pulse width modulation (TCC PWM) solenoid valve is a normally closed solenoid used to control the apply and release of the converter clutch. The PCM operates the solenoid with a negative duty cycle. When vehicle operating conditions are appropriate to apply the TCC, the PCM immediately increases the duty cycle to approximately 42%. The PCM then ramps the duty cycle to approximately 90% to achieve full TCC apply pressure. When the solenoid is commanded OFF, the PCM senses low voltage. When the solenoid is commanded ON, the PCM senses high voltage.

When the PCM detects a continuous open, short to ground or short to power in the TCC PWM solenoid valve circuit, then DTC P1860 sets. DTC P1860 is a type A DTC .

### Conditions for Running the DTC

• | The system voltage is 8-18 volts.

• | The engine has been running for more than 5 seconds, and is not in fuel cut off.

### Conditions for Setting the DTC

• | The TCC PWM solenoid valve duty cycle is less than 10% or greater than 90%.

• | The PCM detects an open, short to ground or a short to power on the TCC PWM solenoid valve circuit within 5 seconds.

### Action Taken When the DTC Sets

• | The PCM illuminates the malfunction indicator lamp (MIL).

• | The PCM inhibits TCC engagement.

• | The PCM freezes shift adapts from being updated.

• | The PCM stores DTC P1860 in PCM history.

### Conditions for Clearing the MIL/DTC

• | The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.

• | A scan tool clears the DTC from PCM history.

• | The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.

• | The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM.

### Diagnostic Aids

• | Inspect the wiring at the PCM, the transmission 20-way connector and the TCC PWM solenoid valve 2-way connector for the following conditions:

- | A backed out terminal

- | A damaged terminal

- | Reduced terminal tension

- | A chafed wire

- | A broken wire inside the insulation

- | Moisture intrusion

- | Corrosion

• | Ensure that the transmission fluid is at the proper level.

• | When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change.

### Test Description

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

1. DTCs P0753 and P0758 set if the power circuit is open.

2. This step tests the PCM and the wiring to the transmission 20-way connector.

3. This step tests circuit 418 for a short to battery power.

4. This step tests the circuit for correct resistance.

#### DTC P1860 TCC PWM Solenoid Circuit -- Electrical (2.4L)

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. Turn the ignition switch to the RUN position.

Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.

3. Record the Freeze Frame and Failure Records.
4. Clear the DTCs.

Are DTCs P0753 and P0758 also set?

--

Go to Step 3

Go to Step 8

3 |

1. Remove the AUTO TRANS fuse.
2. Inspect the fuse for an open.

Was the condition found?

--

Go to Step 4

Go to Step 6

4 | Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems, for complete circuit distribution. Inspect circuit 1039 for a short to ground. Refer to General Electrical Diagnosis in Wiring Systems.

Was the condition found?

--

Go to Step 21

Go to Step 5

5 | Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems, for complete circuit distribution. Inspect circuit 839 for a short to ground. Refer to General Electrical Diagnosis in Wiring Systems.

Was the condition found?

--

Go to Step 22

--

6 | Inspect circuit 1039 for an open. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 21 | Go to Step 7
7 | Inspect circuit 839 for an open. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 22 | --
8 |

1. Turn the ignition switch OFF.
2. Disconnect the transmission 20-way connector (additional DTCs will set).
3. Install the J 39775 jumper harness to the engine side of the 20-way connector.
4. Using the J 35616-A connector test adapter kit, connect a test lamp from terminal E to terminal T.
5. Turn the ignition switch to the RUN position.

Is the test lamp ON?

--

Go to Step 9

Go to Step 11

9 |

1. Turn the ignition switch OFF.
2. Disconnect the C2 PCM connector (additional DTCs will set).
3. Turn the ignition switch to the RUN position.

Is the test lamp ON?

--

Go to Step 10

Go to Step 24

10 | Inspect circuit 418 for a short to ground. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 21 | --
11 | Using the scan tool, cycle the TCC PWM solenoid valve ON and OFF three times. Does the test lamp Cycle ON and OFF as commanded? | -- | Go to Step 16 | Go to Step 12
12 | Is the test lamp always OFF? | -- | Go to Step 13 | --
13 | Inspect circuit 418 for an open. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 21 | Go to Step 14
14 | Connect a test lamp from terminal T to a good ground. Is the test lamp ON? | -- | Go to Step 15 | Go to Step 24
15 | Inspect circuit 418 for a short to battery power. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 21 | --
16 |

1. Turn the ignition switch OFF.
2. Disconnect the J 39775 from the engine side of the 20-way connector.
3. Connect the J 39775 to the transmission side of the 20-way connector.
4. Using the J 35616-A , connect the J 39200 digital multimeter (DMM) from terminal E to terminal T and measure the resistance.

Is the resistance within the specified range?

10-15 ohms

Go to Step 19

Go to Step 17

17 | Is the resistance greater than the specified value? | 250 ohms | Go to Step 18 | Go to Step 19
18 |

1. Inspect circuit 418 for an open.
2. Inspect circuit 418 for a poor connection at the connector.
3. Inspect circuit 839 for an open.
4. Inspect circuit 839 for a poor connection at the connector.

Refer to General Electrical Diagnosis in Wiring Systems.

Was a condition found?

--

Go to Step 22

Go to Step 23

19 | Measure the resistance from terminal T to a good ground. Is the resistance less than the specified value? | 1,000 ohms | Go to Step 20 | Go to Step 23
20 | Inspect circuit 418 for a short to ground. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 22 | --
21 | Repair the wiring as necessary. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 25 | --
22 | Replace the automatic transmission wiring harness. Refer to Unit Repair. Is the replacement complete? | -- | Go to Step 25 | --
23 | Replace the TCC PWM solenoid valve. Refer to Control and Shift Solenoids Replacement. Is the replacement complete? | -- | Go to Step 25 | --
24 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls. Is the replacement complete? | -- | Go to Step 25 | --
25 | Perform the following procedure in order to verify the repair:

1. Select DTC.
2. Select Clear Info.
3. Operate the vehicle under the following conditions:

• | Road test the vehicle with the gear select lever in D4.

• | Increase vehicle speed until the TCC is applied.

• | Ensure that the TCC duty cycle is 10-90% for more than 5 seconds.

4. Select Specific DTC.
5. Enter DTC P1860.

Has the test run and passed?

--

System OK

Go to Step 1

## DTC P1860 TCC PWM Solenoid Circuit Electrical 3.1L

Automatic Transmission Components
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

### Circuit Description

The torque converter clutch pulse width modulation (TCC PWM) solenoid valve is a normally closed solenoid used to control the apply and release of the converter clutch. The PCM operates the solenoid with a negative duty cycle. When vehicle operating conditions are appropriate to apply the TCC, the PCM immediately increases the duty cycle to approximately 42%. The PCM then ramps the duty cycle to approximately 90% to achieve full TCC apply pressure. When the solenoid is commanded OFF, the PCM senses low voltage. When the solenoid is commanded ON, the PCM senses high voltage.

When the PCM detects a continuous open, short to ground or short to power in the TCC PWM solenoid valve circuit, then DTC P1860 sets. DTC P1860 is a type A DTC .

### Conditions for Running the DTC

• | The system voltage is 8-18 volts.

• | The engine has been running for more than 5 seconds, and is not in fuel cut off.

### Conditions for Setting the DTC

• | The TCC PWM solenoid valve duty cycle is less than 10% or greater than 90%.

• | The PCM detects an open, short to ground or a short to power on the TCC PWM solenoid valve circuit within 5 seconds.

### Action Taken When the DTC Sets

• | The PCM illuminates the malfunction indicator lamp (MIL).

• | The PCM inhibits TCC engagement.

• | The PCM freezes shift adapts from being updated.

• | The PCM stores DTC P1860 in PCM history.

### Conditions for Clearing the MIL/DTC

• | The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.

• | A scan tool clears the DTC from PCM history.

• | The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.

• | The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM.

### Diagnostic Aids

• | Inspect the wiring at the PCM, the transmission 20-way connector and the TCC PWM solenoid valve 2-way connector for the following conditions:

- | A backed out terminal

- | A damaged terminal

- | Reduced terminal tension

- | A chafed wire

- | A broken wire inside the insulation

- | Moisture intrusion

- | Corrosion

• | Ensure that the transmission fluid is at the proper level.

• | When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change.

### Test Description

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

1. DTCs P0753 and P0758 set if the power circuit is open.

2. This step tests the PCM and the wiring to the transmission 20-way connector.

3. This step tests circuit 418 for a short to battery power.

4. This step tests the circuit for correct resistance.

#### DTC P1860 TCC PWM Solenoid Circuit -- Electrical (3.1L)

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. Turn the ignition switch to the RUN position.

Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.

3. Record the Freeze Frame and Failure Records.
4. Clear the DTCs.

Are DTCs P0753 and P0758 also set?

--

Go to Step 3

Go to Step 8

3 |

1. Remove the AUTO TRANS fuse.
2. Inspect the fuse for an open.

Was the condition found?

--

Go to Step 4

Go to Step 6

4 | Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems, for complete circuit distribution. Inspect circuit 1039 for a short to ground. Refer to General Electrical Diagnosis in Wiring Systems.

Was the condition found?

--

Go to Step 21

Go to Step 5

5 | Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems, for complete circuit distribution. Inspect circuit 839 for a short to ground. Refer to General Electrical Diagnosis in Wiring Systems.

Was the condition found?

--

Go to Step 22

--

6 | Inspect circuit 1039 for an open. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 21 | Go to Step 7
7 | Inspect circuit 839 for an open. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 22 | --
8 |

1. Turn the ignition switch OFF.
2. Disconnect the transmission 20-way connector (additional DTCs will set).
3. Install the J 39775 jumper harness to the engine side of the 20-way connector.
4. Using the J 35616-A connector test adapter kit, connect a test lamp from terminal E to terminal T.
5. Turn the ignition switch to the RUN position.

Is the test lamp ON?

--

Go to Step 9

Go to Step 11

9 |

1. Turn the ignition switch OFF.
2. Disconnect the C2 PCM connector (additional DTCs will set).
3. Turn the ignition switch to the RUN position.

Is the test lamp ON?

--

Go to Step 10

Go to Step 24

10 | Inspect circuit 418 for a short to ground. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 21 | --
11 | Using the scan tool, cycle the TCC PWM solenoid valve ON and OFF three times. Does the test lamp Cycle ON and OFF as commanded? | -- | Go to Step 16 | Go to Step 12
12 | Is the test lamp always OFF? | -- | Go to Step 13 | --
13 | Inspect circuit 418 for an open. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 21 | Go to Step 14
14 | Connect a test lamp from terminal T to a good ground. Is the test lamp ON? | -- | Go to Step 15 | Go to Step 24
15 | Inspect circuit 418 for a short to battery power. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 21 | --
16 |

1. Turn the ignition switch OFF.
2. Disconnect the J 39775 from the engine side of the 20-way connector.
3. Connect the J 39775 to the transmission side of the 20-way connector.
4. Using the J 35616-A , connect the J 39200 digital multimeter (DMM) from terminal E to terminal T and measure the resistance.

Is the resistance within the specified range?

10-15 ohms

Go to Step 19

Go to Step 17

17 | Is the resistance greater than the specified value? | 250 ohms | Go to Step 18 | Go to Step 19
18 |

1. Inspect circuit 418 for an open.
2. Inspect circuit 418 for a poor connection at the connector.
3. Inspect circuit 839 for an open.
4. Inspect circuit 839 for a poor connection at the connector.

Refer to General Electrical Diagnosis in Wiring Systems.

Was a condition found?

--

Go to Step 22

Go to Step 23

19 | Measure the resistance from terminal T to a good ground. Is the resistance less than the specified value? | 1,000 ohms | Go to Step 20 | Go to Step 23
20 | Inspect circuit 418 for a short to ground. Refer to General Electrical Diagnosis in Wiring Systems. Was the condition found? | -- | Go to Step 22 | --
21 | Repair the wiring as necessary. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 25 | --
22 | Replace the automatic transmission wiring harness. Refer to Unit Repair. Is the replacement complete? | -- | Go to Step 24 | --
23 | Replace the TCC PWM solenoid valve. Refer to Control and Shift Solenoids Replacement. Is the replacement complete? | -- | Go to Step 24 | --
24 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls. Is the replacement complete? | -- | Go to Step 24 | --
25 | Perform the following procedure in order to verify the repair:

1. Select DTC.
2. Select Clear Info.
3. Operate the vehicle under the following conditions:

• | Road test the vehicle with the gear select lever in D4.

• | Increase vehicle speed until the TCC is applied.

• | Ensure that the TCC duty cycle is 10-90% for more than 5 seconds.

4. Select Specific DTC.
5. Enter DTC P1860.

Has the test run and passed?

--

System OK

Go to Step 1