Mazda 2002 6 - Dtc P2502

F–176
ON-BOARD DIAGNOSTIC
DTC P2502
A6E397001083W08
Diagnostic procedure
DTC P2502 Generator terminal B circuit open
DETECTION
CONDITION
• PCM judges generator output voltage is above 17 V or battery voltage is below 11 V during engine
running.
POSSIBLE
CAUSE
• Open circuit between generator terminal B and battery positive terminal
• Battery malfunction
• Generator malfunction
• PCM is poorly connected.
• PCM, generator and/or battery are poorly connected.
STEP INSPECTION ACTION
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
2 INSPECT BATTERY
• Turn ignition key to OFF.
• Inspect battery.
• Is battery okay?
Yes Replace battery, then go to Step 6.
No Go to next step.
3 INSPECT POOR INSTALLATION OF
GENERATOR TERMINAL
• Turn ignition key to OFF.
• Inspect for looseness of generator terminal B
installation nut.
• Is nut loose?
Yes Tighten generator terminal B installation nut, then go to
Step 6.
No Go to next step.
4 INSPECT POOR INSTALLATION OF BATTERY
POSITIVE TERMINAL
• Inspect for looseness of battery positive
terminal.
• Is terminal loose?
Yes Connect battery positive terminal correctly, then go to Step
6.
No Go to next step.
5 INSPECT BATTERY CHARGING CIRCUIT
• Start engine.
• Disconnect battery positive terminal.
• Does engine stall?
Yes Repair or replace harness between generator terminal B
and battery positive terminal, then go to next step.
No Go to next step.