Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0602: Control Module Not ProgrammedDTC P0606: Control Module Internal Performance
DTC P062F: Control Module Long Term Memory Performance
Circuit/System Description
These DTCs apply to internal microprocessor integrity conditions within the engine control module (ECM). This diagnostic also addresses if the ECM is not programmed. The ECM monitors its ability to read and write to the memory. It also monitors a timing function.
Conditions for Running
P0602
The ignition is ON.
P062F
| • | The battery voltage is between 10-16 volts. |
| • | The ignition is ON for longer than 2 seconds. |
Conditions for Setting
P0602
The ECM detects a malfunction in its internal EEPROM.
P0606
The ECM detects that the ECM internal main CPU malfunction or ECM internal monitoring IC malfunction.
P062F
The ECM detects that the calculated checksum does not agree with the ECM internal registered checksum.
Action Taken When the DTC Sets
DTCs P0602, P0606, and P062F are Type A DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0602, P0606, and P062F are Type A DTCs.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Verify the integrity of the ECM power supply or ground circuit by inspecting for the following conditions:
| • | Damaged components |
| • | Loose or improper installation |
Circuit/System Testing
Important: You must perform Circuit/System Verification before proceeding with Circuit/System Testing.
- Test the voltage and ground circuits to the control module for the following:
- Observe the DTCs with the scan tool.
- Replace the ECM.
| • | A short |
| • | An open |
| • | High resistance |
| ⇒ | If DTC P0602 or P062F is set, attempt to program the ECM before replacing the ECM. Refer to Service Programming System (SPS) . |
| ⇒ | If DTC P0606 was set while performing SPS Programming, clear the DTCs and exit the diagnostic. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for engine control module (ECM) replacement, setup, and programming
