DTC P1610 Loss of PZM Serial Data. Cadillac Concours 1996

For 1990-2009 cars

### Circuit Description

This diagnostic test checks for the loss of or invalid Platform Zone Module (PZM) serial data to the PCM. When such a condition exists for 11 seconds DTC P1610 is set.

### Conditions for Setting the DTC

#### Test Condition

DTC P0322 is not set.

#### Failure Conditions

• | Ignition switch ON for 5 seconds and PCM not receiving PZM data.

| OR

• | PCM unable to communicate with the PZM for at least 11 seconds.

### Action Taken When the DTC Sets

• | The Malfunction Indicator Lamp (MIL) will not illuminate.

• | No message will be displayed.

### Conditions for Clearing the DTC

• | A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.

• | A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.

• | Use a scan tool to clear DTCs.

• | Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in PCM Description and Operation.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Refer to PZM System Check | Go to A Powertrain On Board Diagnostic (OBD) System Check