P1610

Diagnostic Chart:

Wiring Diagram:

Circuit Description

The PCM uses the serial data circuit to communicate with vanous other devices and Systems in the vehicle. The PCM ensures that communication remains established by monitoring the serial data circuit for state of health messages from the other devices using the circuit. If the PCM detects a loss of the state of health serial data message from the Standard Body Module, DTC P1610 will be set.

Conditions for Setting the DTC

The ignition is on and the system voltage is greater than 8.2 volts.

Action Taken When the DTC Sets

^ The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure
Records buffers.

^ A history DTC is stored.

Conditions for Clearing the MIL/DTC

^ A history DTC will clear after 40 consecutive warm up cycles without a fault.

^ DTC(s) can be cleared by using a scan tool.

Diagnostic Aids

An intermittent may be caused by a poor connection, rubbed through wire installation or a wire broken inside the insulation. Check for the following conditions:

^ Intermittent short circuit on the serial data circuit.

Refer to Data Link Connector (DLC) System check in Electrical Diagnosis and check all related wiring for an intermittent short to ground or short to voltage.

^ Poor connection.

Inspect the PCM and the affected control module harness and related connectors for improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.

^ Damaged harness.

Inspect the wiring harness for damage. Check for an intermittent short or open circuit in the wiring harnesses related to the affected control module, including the ignition positive voltage, battery positive voltage, ground, and serial data circuits.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the conditions.

Attempting to start the vehicle by bypassing the Theft Deterrent system or substituting parts without performing the password learn procedure may set a DTC P1631.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.

2. A scan tool that cannot display PCM data indicates that a short, or open may exist on the serial data circuit.

4. An intermittent short on the EBCM serial data circuit could cause this DTC to set. When the fault is present, the scan tool will lose communication with the PCM. Check for chaffed wiring or a malfunctioning EBCM.

5. The DTC is intermittent when a scan tool can communicate with the PCM. DTCs within the BFC or EBCM may lead to a possible cause of the intermittent problem.

If the serial data loss occurred after a good theft password has been received, the PCM must be reprogrammed and the password learn and the crankshaft position variation learn procedures must be completed to allow the theft system to operate properly.

7. If no faults have been found at this point and no additional DTCs were set, refer to Diagnostic Aids for additional checks and information.