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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0603, DTC P0605, DTC P0606, DTC P1605, DTC P1633 Or DTC P1639 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed and DTC P0605 or P1639 is present, go to next step. For all other DTCs, go to step  3.

  2. Program PCM Parameters

    Connect scan tool with flash cable. Turn ignition on, engine off. Select DIAGNOSTIC DATA LINK. Select PCM. Select MODULE CONFIGURATION and follow directions to access. Scroll to TIRE SIZE and press TRIGGER. Turn dial to select 720 for 235/70R16 tires or 749 for 215/70R16 tires then press TRIGGER. Scroll to AXLE RATIO and press TRIGGER. Turn dial to select 3.78 and press TRIGGER. Press START to program PCM parameters. Press CANCEL to return to first screen. If programming was successful, Clear DTCs and perform brief drive cycle of at least a quarter mile. Start and stop vehicle 2 times during cycle, turning ignition on and off. After completing drive cycle, go to step  6. If programming was unsuccessful, refer to appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT.
    3. NOTE: If KAPWR is interrupted to PCM (when breakout box is installed or battery is disconnected), DTCs P0603 and P1605 can be generated on first power-up.
  3. Check Battery Terminals -  Inspect battery cables for loose connections, corrosion. If battery terminal connections are in good condition, go to next step. If battery connections are not good, repair as necessary. After repair, go to step  6.
  4. Inspect Engine Compartment For Proper Wire Routing -  Inspect engine compartment wiring for proximity to ignition components or wires. If wiring is too close to ignition components or wires, reroute wiring as necessary. If wire harness routing is okay, go to next step.
  5. Check Keep Alive Power (KAPWR) To PCM -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure voltage between breakout box terminals No. 55 (KAPWR) and No. 103 (PWR GND). While observing multimeter, grasp engine harness and wiggle, shake or bend a small section while working from PCM to dash panel. If voltage reading indicates less than 10.5 volts at any time, repair open in KAPWR circuit (Red/Light Green wire). If voltage reading does not indicate less than 10.5 volts at any time, go to next step.
  6. Verify Trouble Shooting Of DTCs Completed -  Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is not present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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