DTC P0601, P0602, P0603, or P0604
Diagnostic Instructions
DTC Descriptors
| DTC P0601: Control Module Read Only Memory
Performance |
| DTC P0602: Control Module Not Programmed |
| DTC P0603: Control Module Long Term Memory
Reset |
| DTC P0604: Control Module Random Access Memory
Performance |
Circuit/System Description
This is an internal fault detection of the transmission control
module (TCM). This fault is handled inside the TCM and no external
circuits are involved.
Conditions for Running the DTC
The TCM runs the program to detect an internal condition at key
ON. The only requirements are voltage and ground. This program runs
even if the voltage is out of the valid operating range.
Conditions for Setting the DTC
P0601
The read only memory (ROM) test has failed 5 or more times.
P0602
The TCM has been unable to detected the start program.
P0603
The TCM has detected a memory checksum error.
P0604
The TCM random access memory (RAM) test has failed 5 or more times.
Action Taken When the DTC Sets
P0601, P0602, P0603, P0604
| • |
DTCs P0601, P0603, P0604 are
Type A DTCs. |
| • |
The TCM commands maximum line
pressure. |
| • |
The TCM forces the torque
converter clutch (TCC) OFF. |
| • |
The TCM inhibits TCC
engagement. |
| • |
The TCM freezes transmission
adaptive functions. |
| • |
The TCM commands an immediate
landing to 2nd gear. |
Conditions for Clearing the DTC
DTCs P0601, P0602, P0603, P0604 are Type A DTCs.
Reference Information
Description and Operation
Transmission Component and System Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 1. |
Engine running. Let the engine
run for at least 1 min. |
| 2. |
Ignition OFF for at least 30 s
to allow for the complete shutdown of the TCM. |
| 3. |
Ignition ON, verify that DTC
P0602 is not set. |
| ⇒ |
If the DTC is set, program the TCM. If the DTC
resets, replace the TCM. |
| 4. |
Observe the DTC information
with a scan tool. DTCs P0601, P0603, P0604 should not set.
|
| ⇒ |
If a DTC sets, replace the TCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
