DTC Descriptors
DTC P0601: Control Module Read Only Memory (ROM)
DTC P0602: Control Module Not Programmed
DTC P0603: Control Module Long Term Memory Reset
DTC P0604: Control Module Random Access Memory (RAM)
DTC P0606: Control Module Internal Performance
DTC P0607: Control Module Performance
DTC P060D: Control Module Accelerator Pedal Position (APP) System Performance
DTC P062F: Control Module Long Term Memory Performance
DTC P2610: Control Module Ignition Off Timer Performance
Description
This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM) and the throttle actuator control (TAC) system. 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. The ECM and the TAC processors are used to monitor the TAC system data. Both processors monitor the other processors data to verify that the indicated APP
calculation is correct. The ECM performs an intrusive test in order to confirm that the APP signals are not shorted together. The ECM accomplishes this by pulling the APP sensor 2 low momentarily and looking for sensor 1 to also be pulled low.
Conditions for Running the DTC
P0601, P0603
| • | The ignition switch is in Run or Crank. |
| • | The system voltage is more than 5 volts. |
P0602
| • | The ignition switch is in Run or Crank. |
| • | The controller is identified as a service replacement ECM. |
P0604, P062F
The ignition switch is in Run or Crank.
P0606
| • | The ignition switch is in Run or Crank. |
| • | During test function after key off before the control module powers down. |
P0607
| • | The ignition switch is in Unlock, Accessory, Run or Crank. |
| • | The system voltage is more than 5.23 volts. |
| • | DTCs P0601, P0602, P0603, P0604, P0606, P0607, P062F, P0641, P0651, P2610 are not set |
P060D
| • | The ignition switch is in Run or Crank. |
| • | The system voltage is more than 5 volts. |
P2610
| • | The ignition switch is in the OFF position for at least 1.6 seconds. |
| • | A low battery voltage or a battery disconnect condition has not taken place. Ignition OFF timer from the previous ignition cycle is stored. |
Conditions for Setting the DTC
P0601
The ECM checksum value is incorrect for at least one sample. Each sample is 50 milliseconds. The ECM detects that the check sum value is incorrect for 0.05 second. This diagnostic runs continuous.
P0602
The ECM has not been programmed with Key On and Engine Off for one sample. Each sample is 100 milliseconds. The ECM has not been programmed at Key On and Engine Off for 0.1 second. This diagnostic runs continuous.
P0603
The ECM check sum value at the last power down does not match the ECM check sum value during the current power up for one sample. Each sample is 10 milliseconds. The ECM detects that the check sum value at the last power down does not match the
ECM check sum value during the current power up is incorrect for 0.01 second. This diagnostic runs once per ignition cycle at power up.
P0604
The ECM is unable to correctly write and read to and from random access memory (RAM) during the following conditions:
| • | Key up initialization for one count. Each count is a read and write sample. Each sample is 100 milliseconds. This portion runs once per ignition cycle. |
| • | Counter increments by 10 for each sample that does not correctly read and write to the RAM, and decrements by one for each correct sample. No more than 20 counts which do not read and or write correctly. Each read and write sample is 100 milliseconds.
This portion runs continuously. |
| • | Counter increments by 10 for each sample that does not correctly read and write to the Desired Throttle Position RAM and decrements by one for each correct sample. No more than 20 counts which do not read and or write correctly. Each read and write
sample is 12.5 milliseconds. This portion runs continuously. |
P0606
The ECM detects that the TAC system has a process sequence error, clock error, and 2 motor processor errors, or ETC Internal Processor is not operating correctly. Each test runs in 12.5, 25, 50, 100 and 250 milliseconds. This DTC runs continuously.
P0607
The state of health discrete line between the ETC internal processor and the ECM is not toggling for more than 0.5 second. This DTC runs continuously.
P060D
The difference between the main processor (ECM) indicated accelerator pedal position and the MHC processor indicated accelerator pedal position is more than 2.5 percent.
P062F
The ECM did not complete the last electrically erasable programmable read only memory (EEPROM) write event during the last ECM power down. This diagnostic runs once per ignition cycle at power up.
P2610
This diagnostic has 2 tests that may set this DTC:
Phase 1
| • | The ECM detects the ignition off timer is less than 1 second at any time. |
| • | The ECM detects the ignition off timer is 15 seconds or more if the actual elapsed time is less than 15 seconds. |
| • | This diagnostic runs continuous. |
Phase 2
| • | The last ignition off time event increments more than 1.375 seconds or less than 0.8 second for each second. |
| • | This diagnostic runs continuous. |
Actions Taken When the DTC Sets
| • | DTC P0601-P0604, P0606, P0607, P060D, and P062F are Type A DTCs. |
| • | DTC P2610 is a Type B DTC. |
Conditions for Clearing the DTC
| • | DTC P0601-P0604, P0606, P0607, P060D, and P062F are Type A DTCs. |
| • | DTC P2610 is a Type B DTC. |
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Testing
- Observe the DTCs with the scan tool.
| ⇒ | If DTC P0602 resets, replace the ECM. |
- Test the voltage and ground circuits to the ECM for the following:
| ⇒ | If all circuits test normal, replace the ECM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for ECM replacement, programming and setup
