The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
On rare occasions, a check engine light may be experienced with DTC P0171, P0441, P0455, and/or P2420. These DTCs may be a result of an internal PCM driver issue that may keep the EVAP purge solenoid control circuit grounded at times instead of supplying a pulse width signal on the circuit.
If the SI diagnostics do not isolate a cause for the concern, inspect the white PCM label for any of the following part numbers, which may be causing the concern:
If any of the above part numbers are found, replace the PCM with the correct one listed below:
Auto FWD with RPO JL4
Auto FWD without RPO JL4
#PIP3621: DTCs P0171, P0441, and/or P2420 - Inspect Production Part Number on PCM - keywords CEL check ECM EVAP lamp lean light repeat trim updated - (Nov 9, 2005)
IS THERE A NUMBER WE CAN CALL YOU AT?
OUR PCM HAS A TOYOTA PART NUMBER 89661-01133. WHICH DOESNT MATCH THE NUMBER YOU GAVE US. SHOULD THE PCM STILL BE TNE PROBLEM?