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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 46 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0603, DTC P1605, DTC P1633 Or DTC P1639 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. 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, go to next step.
    NOTE: If PCM KAPWR is interrupted (i.e. when installing or removing breakout box or battery disconnect), DTCs P0603 and/or P1605 may be set on first power-up.

  2. Check Battery Terminals

    Inspect battery cables for loose connections and corrosion. If battery cable connections are okay, go to next step. If battery cable connections are not okay, repair as necessary. Go to step  5 .

  3. Inspect Engine Compartment For Proper Wire Routing

    Inspect engine compartment for proper wire routing paying specific attention to ignition components and wires. If wiring is to close to ignition components or wires, reroute wires as necessary. Go to step  5 . If wiring is not to close to ignition components or wires, wire routing is okay. Go to next step.

  4. Check Keep Alive Power (KAPWR) To PCM

    Disconnect PCM connector. Install breakout box, leaving PCM disconnected. Measure voltage between breakout box terminals No. 55 (KAPWR circuit) and No. 103 (PWR GND circuit). While observing DVOM, wiggle and shake wiring harness, and bend wiring harness working from PCM to dash panel. If voltage is less than 10.5 volts at any time, isolate and repair open in KAPWR circuit. Go to next step. If voltage did not drop to less than 10.5 volts, KAPWR circuit is okay. Go to next step.

  5. Verify Trouble Shooting Of DTCs Completed

    Reconnect all electrical connectors. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTCs are set, trouble shooting is complete.
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