DTC 44. Chevrolet Joy 2008

For 1990-2009 cars

### Circuit Description

No engine RPM signal.

### Conditions for Running the DTC

• | Automatic transmission output speed is greater than 2,000 RPM.

• | Vehicle speed is in the range of 24-91 km/h (15-57 mph).

### Conditions for Setting the DTC

No engine speed signal

### Action Taken When the DTC Sets

The transmission control module (TCM) illuminates the A/T warning lamp when the diagnostic runs and fails.

### Conditions for Clearing the MIL/DTC

The TCM turns OFF the A/T warning lamp when the diagnostic runs and does not fail.

#### DTC 44

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Automatic Transmission

2

1. Ignition OFF.
2. Disconnect the transmission control module (TCM) connector.
3. Turn ON the ignition, with the engine OFF.
4. Using a DMM, measure voltage between TCM connector terminal 39 and ground.

Is the voltage greater than the specified value?

10 V

Go to Step 3

Go to Step 5

3

Important: Engine running at idle speed at operating temperature.

1. Ignition OFF.
2. Connect a tachometer between TCM connector terminal 39 and ground.

Is the RPM within the specified value?

630-930 RPM

Go to Step 8

Go to Step 4

4 | Inspect circuit for a short to voltage between the TCM connector terminal 39 and engine control module (ECM) connector terminal 48. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 5
5 | Test for an open circuit between TCM connector terminal 39 and ECM connector terminal 48. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 6
6 | Test circuit for a short to ground between TCM connector terminal 39 and ECM connector terminal 48. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 7
7 | Replace the ECM. Refer to Engine Control Module Replacement . Did you complete the replacement? | -- | Go to Step 9 | --
8 | Replace the TCM. Refer to Transmission Control Module Replacement . Did you complete the replacement? | -- | Go to Step 9 | --

9

1. Clear the DTCs. Refer to Clearing Transmission Diagnostic Trouble Codes .
2. Start the engine.
3. Operate the vehicle within Conditions for Running the DTC.

Does the DTC reset?

--

Go to Step 2

System OK