No Response From All Modules

*NO RESPONSE FROM ALL MODULES









For a complete Data Link Connector Circuit Diagram, Communications.

Diagnostic Test

1. CHECK PCM C4 HARNESS CONNECTOR CONNECTION
Turn the ignition off.
Disconnect the PCM C4 harness connector.

NOTE: Check connector - Clean/repair as necessary.

Reconnect the PCM C4 harness connector.
Turn the ignition on.
Attempt to communicate with any module with the scan tool.
Does the scan tool communicate with the module selected?

Yes

- The repair is complete.
- Perform POWERTRAIN VERIFICATION TEST - VER 2. Powertrain Verification Test

No

- Go to 2

2. DISCONNECT THE FUEL TANK PRESSURE SENSOR
Turn the ignition off.
Disconnect the Fuel Tank Pressure Sensor harness connector.
Attempt to communicate with any module with the scan tool.
Does the scan tool communicate with the module selected?

Yes

- Replace the Fuel Tank Pressure Sensor. Removal.

No

- Go to 3

3. MEASURE THE PCM SENSOR GROUND CIRCUIT VOLTAGE




With the ignition on.
Measure the voltage of the Sensor Ground circuit at DLC cavity 5.
Is the voltage below 0.5 volts?

Yes

- Go to 4

No

- Go to 5

4. MEASURE THE PCM SENSOR GROUND CIRCUIT




Turn the ignition off.
Disconnect the PCM C4 harness connector.

NOTE: Check connector - Clean/repair as necessary.

Measure the resistance of the Sensor Ground circuit from PCM C4 harness connector cavity 10 to DLC cavity 5.
Is the resistance below 5.0 ohms?

Yes

- Replace the Powertrain Control Module. Powertrain Control Module - Removal.
- Perform POWERTRAIN VERIFICATION TEST - VER 2. Powertrain Verification Test

No

- Repair the Sensor Ground circuit for an open.
- Perform POWERTRAIN VERIFICATION TEST - VER 2. Powertrain Verification Test

5. MEASURE THE PCM SENSOR GROUND CIRCUIT VOLTAGE WITH THE PCM DISCONNECTED




Turn the ignition off.
Disconnect the PCM C4 harness connector.

NOTE: Check connector - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Sensor Ground circuit at DLC cavity 5.
Is the voltage below 0.5 volt?

Yes

- Replace the Powertrain Control Module. Powertrain Control Module - Removal.
- Perform POWERTRAIN VERIFICATION TEST - VER 2. Powertrain Verification Test

No

- Repair the Sensor Ground circuit for a short to voltage.
- Perform POWERTRAIN VERIFICATION TEST - VER 2. Powertrain Verification Test