Diagnostic Test

1) CHECK COMMUNICATION WITH OTHER MODULES

Fig 1: Connecting Scan Tool & Turning Ignition On
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition on.

Using the DRB III®, attempt to communicate with any other module.

Is the DRB III® able to communicate with the module selected?

Yes
1. Go to step 2).
No
1. Perform Symptom *No Response From All Modules.
2) TRACTION SYSTEM RELAY OUTPUT CIRCUIT OPEN

Fig 2: Checking Traction System Relay Output Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the TCM harness connector.

NOTE: Check connector - Clean/repair as necessary.

Turn the ignition on.

Measure the voltage of the Traction System Relay Output circuit at the TCM harness connector.

Is the voltage above 10 volts?

Yes
1. Go to step 3).
No
1. Repair the Traction System Relay Output circuit for an open.
2. Perform TRANSMISSION VERIFICATION TEST .
3) GROUND CIRCUIT OPEN

Fig 3: Checking Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance of the Ground circuit from the TCM harness connector to ground.

Is the resistance below 5.0 ohms?

Yes
1. Go to step 4).
No
1. Repair the Ground circuit for an open.
2. Perform TRANSMISSION VERIFICATION TEST .
4) SCI TRANSMIT CIRCUIT OPEN

Fig 4: Checking SCI Transmit Circuit
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition off.

Measure the resistance of the SCI Transmit circuit from the TCM harness connector to the DLC.

Is the resistance below 5.0 ohms?

Yes

Go to step 5).

No
1. Repair the SCI Transmit circuit for an open.
2. Perform TRANSMISSION VERIFICATION TEST .
5) SCI TRANSMIT CIRCUIT SHORTED TO GROUND

Fig 5: Checking SCI Transmit Circuit
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition off.

Measure the resistance between ground and the SCI Transmit circuit.

Is the resistance above 100 kohms?

Yes
1. Go to step 6).
No
1. Repair the SCI Transmit circuit for a short to ground.
2. Perform TRANSMISSION VERIFICATION TEST .
6) SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE

Fig 6: Checking SCI Transmit Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition on.

Measure the voltage of the SCI Transmit circuit at the DLC.

Is the voltage below 0.5 volt?

Yes
1. Replace the Transmission Control Module. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - REMOVAL) .
2. Perform TRANSMISSION VERIFICATION TEST .
No
1. Repair the SCI Transmit circuit for a short to voltage.
2. Perform TRANSMISSION VERIFICATION TEST .