Dtc P2507[L3 With Tc] - Mazda CX-7 2007 Workshop Manual

STEP
5 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (damaged/pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
6 INSPECT GENERATOR CONTROL CIRCUIT
FOR SHORT TO POWER
• Turn the ignition switch to the ON position
(engine off).
• Measure the voltage between generator
terminal D (wiring harness-side) and body
ground.
• Is the voltage B+?
7 INSPECT GENERATOR CONTROL TERMINAL
FOR SHORT TO POWER
• Measure the voltage between generator
terminal D (part-side) and body ground.
• Is the voltage B+?
8 VERIFY TROUBLESHOOTING OF DTC P2504
COMPLETED
• Make sure to reconnect all connectors.
• Clear the DTC from the PCM memory using
the M-MDS.
• Perform the KOER self-test.
• Start the engine.
• Is the same DTC present?
9 VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
(See01-14-4 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Ares any DTCs present?
End Of Sie

DTC P2507[L3 WITH TC]

DTC P2507 PCM +BB (back-up battery) voltage low
• The PCM monitors the voltage of the back-up battery positive terminal. If the PCM detects that the battery
positive terminal voltage isbelow 2.5 V for2 s, the PCM determines that the backup voltage circuit has
a malfunction.
Diagnostic support note
DETECTION
• This is a continuous monitor (CCM).
CONDITION
• MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
• Melt down EEC fuse
• Open circuit in the wiring harness between the EEC fuse and PCM terminal 1BA
POSSIBLE
• Short to ground between the EEC fuse and PCM terminal 1BA
CAUSE
• Poor connection of the PCM connector.
• PCM malfunction
01-02–256
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
Yes Repair or replace the pins, then go to Step 8.
No Go to the next step.
Yes Repair or replace the wiring harness for a short to power
supply, then go to Step 8.
No Go to Step 8.
Yes Repair or replace the generator, then go to the next step.
No Go to the next step.
Yes Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)
No Go to the next step.
Yes Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Troubleshooting completed.
ACTION
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