Data Communications

DTC P0601-P0604, P0606, or P062F

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0601 00
- Control Module Read Only Memory Performance Malfunction

DTC P0602 00
- Control Module Not Programmed Malfunction

DTC P0603 00
- Control Module Long Term Memory Reset Malfunction

DTC P0604 00
- Control Module Random Access Memory Performance Malfunction

DTC P0606 00
- Control Module Processor Performance Malfunction

DTC P062F 00
- Control Module Long Term Memory Performance Malfunction

Circuit/System Description

This diagnostic applies to internal microprocessor integrity conditions within the device. This diagnostic also addresses if the device is not programmed. The device monitors its ability to read and write to the memory. It also monitors a timing function. No external circuits are involved.

Conditions for Running the DTC

* The ignition is ON.

* The system voltage is greater than 9.5 V.

Conditions for Setting the DTC

The device detects an internal malfunction or incomplete programming.

Action Taken When the DTC Sets

DTCs P0601, P0602, P0603, P0604, P0606, and P062F are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0601, P0602, P0603, P0604, P0606, and P062F are Type A DTCs.

Diagnostic Aids

If stored only as a history DTC and not retrieved as a current DTC, do not replace the device.

Reference Information

Schematic Reference

Data Communication Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Data Link Communications Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool References

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify DTC P0602 is not set.

• If DTC P0602 is set

1. Program the device that set the DTC.

2. Verify the DTC does not set.

• If the DTC sets, replace the device that set the DTC.

• If the DTC does not set

3. All OK.

• If DTC P0602 is not set

3. Verify DTC P0601, P0603, P0604, P0606, or P062F is not set.

• If DTC P0601, P0603, P0604, P0606, or P062F is set
Replace the device that set the DTC.

• If DTC P0601, P0603, P0604, P0606, or P062F is not set

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Control Module References for device replacement, programming and setup