Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL FS]
DTC P1602 Immobilizer unit (IU) — PCM communication error
DESCRIPTION
• Command transmission from PCM to IU exceed limit
• No response from IU
[Possible Cause]
• Defective wiring harness • Defective coil
• Defective IU • Defective key (transponder)
• Defective PCM
STEP
INSPECTION ACTION
1 CHECK DTC PRESENT
• RESET PCM to completely clear DTCs.
e r After Repair Procedure
• RERUN OBD test.
• Is same DTC present after cranking?
Yes Go to next step.
No
Different DTC displayed:
Go to appropriate DTC inspection.
No DTC displayed:
Troubleshooting is completed.
2
CHECK IMMOBILIZER SYSTEM DTC
PRESENT
• Does security light indicate DTC 01 ?
Yes Go to DTC 01 inspection.
No Go to next step.
3
CHECK IMMOBILIZER SYSTEM DTC
PRESENT
• Does security light indicate DTC 03?
Yes Go to DTC 03 inspection.
No Go to next step.
4 CHECK IMMOBILIZER SYSTEM DTC
PRESENT
• Is other DTC present except P1624?
Yes Go to other DTC inspection.
No Go to next step.
5 CHECK WIRING HARNESS OPEN CIRCUIT
• Check for wiring harness open circuit with
IU connector disconnected:
• IU(A) - PCM(5)
• IU (C )-G ro u n d
• IU(J) - Battery
• IU(L) - Ignition switch(black/white)
• Is there open circuit?
Yes Repair wiring harness.
No Go to next step.
6
CHECK WIRING HARNESS SHORT
CIRCUIT
• Check for wiring harness short circuit with
IU connector disconnected:
• IU(A) - PCM(5)
• IU(F) - Coil(yellow)
• IU(D) - Coil(green)
• Is there short circuit?
Yes Repair wiring harness.
No Replace IU and reprogram immobilizer system.
I r 0 9 -1 4 IMMOBILIZER SYSTEM REPROGRAMMING
PROCEDURE, Immobilizer Replacement
Go to next step.
7 CHECK DTC REPRESENT
• Does engine start after replacing IU and
clearing DTC?
Yes Troubleshooting is completed.
No Replace PCM and reprogram immobilizer system.
w 0 9-14 IMMOBILIZER SYSTEM REPROGRAMMING
PROCEDURE, PCM Replacement
DTC P1603
P1604
Code word unregistered in PCM
Key ID numbers unregistered in PCM
DESCRIPTION
• Code word is not registered in PCM. (P1603)
• Key ID numbers are not registered in PCM. (P1604)
[Possible Cause]
• Immobilizer system reprogram procedure was not
performed correctly after replacing PCM.
STEP
INSPECTION
ACTION
1
CHECK DTC PRESENT
• RESET PCM to completely clear DTCs.
tr After Repair Procedure
• RERUN OBD test.
• Is same DTC present after cranking?
Yes Perform reprogram procedure again.
D- 0 9-14 IMMOBILIZER SYSTEM REPROGRAMMING
PROCEDURE, PCM Replacement
No Troubleshooting is completed.
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