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Powertrain Control Module (Pcm) Malfunction

DTC P0603, P1605, P1633 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0603, P1605, P1633 POWERTRAIN CONTROL MODULE (PCM) MALFUNCTION
DETECTION CONDITION 
  • PCM has experienced a power interrupt in the Keep Alive Power (KAPWR) circuit.
  • Indicates the PCM has experienced an internal memory test failure. However there are external items that can cause the DTC.
  • Indicates that the Keep Alive Power (KAPWR) circuit has experienced a power interrupt.
POSSIBLE CAUSE 
  • Battery terminal corrosion or loose connections.
  • Improper KAPWR circuit wire routing.
  • Harness open in KAPWR circuit to PCM.
  • Damaged PCM.
  • Reprogramming.
  • Intermittent KAPWR circuit.
DTC P0603, P1605, P1633 INSPECTION

STEP INSPECTION ACTION
1 CHECK BATTERY TERMINALS
NOTE: If KAPWR is interrupted to the PCM (that is, when a Breakout Box is installed or the battery is disconnected), DTCs P0603/P1605 can be generated on the first power-up.
  • Inspect the battery cables for loose connections, corrosion.
  • Are the battery terminal connections in good condition? 
 Yes Battery terminals are OK.
Go to step 2.
No Repair battery terminals as necessary.
Go to step 5.
2 INSPECT ENGINE COMPARTMENT FOR PROPER WIRE ROUTING
  • Inspect engine compartment wiring for proximity to ignition components or wires.
  • Is wiring too close to ignition components or wires? 
 Yes Reroute wires as necessary.
Go to step 5.
No Engine compartment wire routing is OK.
Go to step 3.
3 CHECK KEEP ALIVE POWER (KAPWR) TO PCM
  • Key OFF.
  • Disconnect PCM. Inspect for damaged or pushed out pins, corrosion and loose wires.
  • Repair as necessary.
  • Install Breakout Box, leave PCM disconnected.
  • Measure voltage between test pin 55 (KAPWR) and test pin 51 or 103 (PWR GND) at Breakout Box.
  • While observing multimeter, grasp the engine harness and wiggle, shake or bend a small section while working from the PCM to the dash panel.
  • Does the voltage reading indicate less than 10.5 volts? 
 Yes Isolate and repair open in KAPWR circuit.
Go to step 5.
No No open in KAPWR harness circuit detected.
Remove Breakout Box.
Reconnect PCM.
Go to step 4.
4 CHECK FOR REPEAT OF DTC P0603/P1605/P1633
  • Activate Key On Engine Off (KOEO) Self Test.
  • Is DTC P0603, P1605 or P1633 present? 
 Yes Replace PCM. See POWERTRAIN CONTROL MODULE .
Go to step 5.
No Repair other DTCs as necessary. If none, testing is complete.
Go to step 5.
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