Mazda 626 - DTC P1633 (Except for GF4 A-EL Models);Diagnostic Procedure

ON-BOARD DIAGNOSTIC
DTC P1633
Except for GF4A-EL Models
DTC P1633
Battery overcharge
DETECTION
CONDITION
PCM monitors input voltage from generator and battery positive terminal. If PCM detects that
generator output voltage is above 16.5 V or battery voltage above 16.0 V for 5 seconds while engine
running, PCM determines that charging system has malfunction.
POSSIBLE
CAUSE
• Short to power circuit between the generator connector terminal D and the PCM connector terminal 10
• Generator malfunction
• PCM malfunction
PCM
GENERATOR
ÌP □ (I D 11 P I)
30
\
PCM
71
HARNESS SIDE CONNECTOR
(VIEW FROM TERMINAL SIDE)
i III III I III
rr V -i I I I ri 1111 ; I
I I I I I I -I I I I
1,1,1,1,1,1
53
HARNESS SIDE CONNECTOR
(VIEW FROM TERMINAL SIDE)
X I
97
Diagnostic procedure
STEP INSPECTION
ACTION
1
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
Yes Perform repair or diagnosis according to available
Service Information.
• If vehicle is not repaired, then go to next step.
No Go to next step.
2 CLASSIFY INTERMITTENT CONCERN OR
CONTINUOUS CONCERN
• Start engine.
• Access ALTT V PID and B+ PID using NGS
tester
• Is ALTT V PID above 16.5 V and B + PID
below 16.0 V?
Yes Go to next step.
No Intermittent concern is existing. Go to
INTERMITTENT CONCERN TROUBLESHOOTING
procedure.
(See F1-142 No.26 INTERMITTENT CONCERNS)
3 INSPECT POOR CONNECTION OF
GENERATOR CONNECTOR
• Turn ignition key to OFF.
• Disconnect generator connector.
• Check for poor connection (damaged,
pulled-out terminals, corrosion, etc.).
• Are there any malfunctions?
Yes Repair or replace terminals, then go to Step 8.
No Go to next step.
F1-95