Mazda MX-6 1998, Workshop Manual

Page: 1023 / 1282

TROUBLESHOOTING [IMMOBILIZER SYSTEM]
DTC indicated by PCM
DTC No. C o n d itio n
MIL
P1602
Immobilizer unit — PCM communication error
OFF
P1603
Code word unregistered in PCM
OFF
P1604
Key ID number unregistered in PCM
OFF
P1621
Code word does not match after engine cranking
OFF
P1622 Key ID number does not match
OFF
P1623 Code word or key ID number write/read error in PCM
OFF
P1624
Immobilizer system communication counter = 0
OFF
DTC indications after 4th engine cranking under immobilizer system malfunctions (Reference)
Note
• When the following malfunctions occur on the immobilizer system, DTC(s) will be indicated as follows.
• These are not all potential malfunctions.
Malfunctions 01 02 03 11 21 24
30
P1602
P1603 P1604 P1621 P1622 P1623 P1624
Open
circuit
IU-PCM
3 3
IU-Ground
3 3
IU-Coil 1 1 3 1
IU-Battery Engine runs normally and no DTC is indicated.
IU-lgnition switch Engine runs normally and no DTC is indicated.
IU-Battery and
IU-lgnition switch
2 2
IU-Security light Engine runs normally and no DTC is indicated. No security light illumination after cranking.
Short
circuit
IU-PCM
1 1
IU-Coil 3 3
IU-Security light Engine runs normally and no DTC is indicated. Security light illuminates at all key positions.
Code word mismatch
(IU-PCM)
1 1
Key without transponder 1
2
1
Unregistered key 1 2
1
1 : DTC is indicated after clearing DTC by NGS.
2 : DTC is indicated after clearing DTC by NGS and turning key to ON.
3 : DTC is indicated after clearing DTC by NGS and cranking the engine.
0 9 -0 1 F -2