Mazda 626 Station Wagon, Workshop Manual

Page: 188 / 577

ON-BOARD DIAGNOSTIC SYSTEM
DTC
No.
Output pattern
Diagnosed
circuit
Detection condition
Fail-safe
x : Applied
Not applied
Memory
function
P1402
II
EGR valve
position
signal circuit
• Input voltage from EGR valve
position sensor is below 0.1 V
or above 4.9 V when
continued for
1.0
sec.
Turns EGR
solenoid valve
(vacuum vent) off.
P1602
(with
immo­
bilizer
system)
lili
Immobilizer
unit-PCM
communicati
on line
Command transmission from
PCM to immobilizer unit
exceeds limit. No response
from immobilizer unit.
P1603
(with
immo­
bilizer
system)
ID number is
unregistered.
(Immobilizer)
Key ID is not registered in
PCM.
P1604
(with
immo­
bilizer
system)
Code word is
unregistered.
(Immobilizer)
• Code word numbers are not
registered in PCM.
P1621
(with
immo­
bilizer
system)
i
Code words
do not
match.
(Immobilizer)
• Code word stored in PCM and
immobilizer unit do not match.
P1622
(with
Immo­
bilizer
system)
ID
numbers do
not match.
(Immobilizer)
ID numbers stored in
immobilizer unit and PCM do
not match. (This DTC is
indicated only after immobilizer
unit is replaced and
reprogramming system.)
P1623
(with
immo­
bilizer
system)
Hill
Code
word/ID
number
writing and
reading
error
(Immobilizer)
• PCM internal EEPROM
malfunction.
P1624
(with
immo­
bilizer
system)
m m
PCM does
not receive
unlock
signal from
immobilizer
unit. (PCM
is okay.)
• PCM detects immobilizer
system malfunction more than
three times.
P1649
PCM
internal
circuit
PCM failed to communicate
with injection pump EPROM.
(User warning light flashes.)
F 2-12