Security Light: Dtc - Mazda 2002 6 Workshop Manual

ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM]
End Of Sie
SECURITY LIGHT: DTC 11 (WDS OR EQUIVALENT: DTC B1681)
DTC 11 (B1681) Coil signal is not received.
• Defective wiring harness
POSSIBLE
• Defective coil
CAUSE
• Defective PCM
Diagnostic procedure
STEP
1 INSPECT POWER SUPPLY CIRCUIT OF COIL
• Disconnect coil connector.
• Turn ignition switch to ON position.
• Measure voltage at terminal D of coil
connector.
• Is voltage more than 8 V?
2 INSPECT WIRING HARNESS BETWEEN COIL
AND GROUND
• Turn ignition switch to LOCK position.
• Inspect wiring harness between coil
connector terminal C and ground for
following.
— Short to power supply
— Open circuit
• Is wiring harness okay?
3 INSPECT COIL INPUT SIGNAL CIRCUIT
• Connect coil connector.
• Turn ignition switch to ON position.
• Measure voltage at terminal B of coil
connector.
• Is voltage more than 8 V?
4 INSPECT COIL INPUT SIGNAL CIRCUIT
• Turn ignition switch to LOCK position.
• Disconnect PCM connector.
• Turn ignition switch to ON position.
• Measure voltage at terminal 2T of PCM
connector.
• Is voltage more than 8 V?
5 INSPECT COMMUNICATION CIRCUIT
(INPUT) FOR CONTINUITY
• Turn ignition switch to LOCK position.
• Disconnect coil and PCM connectors.
• Is there continuity between coil connector
terminal B and PCM connector terminal 2T?
6 INSPECT COIL INPUT SIGNAL CIRCUIT
• Measure resistance between coil connector
terminal B and ground.
• Is resistance more than 10 kilohms?
7 INSPECT COIL OUTPUT SIGNAL CIRCUIT
• Connect coil and PCM connectors.
• Turn ignition switch to ON position.
• Measure voltage at terminal A of coil
connector.
• Is voltage more than 8 V?
T–162
COIL
HARNESS SIDE CONNECTOR
D C B A
INSPECTION
PCM
HARNESS SIDE CONNECTOR
2T 2Q
Yes Go to next step.
No Repair wiring harness.
Yes Go to next step.
No Repair wiring harness.
Yes Go to Step 7.
No Go to next step.
Yes Replace PCM and reprogram immobilizer system.
(See T–90 IMMOBILIZER SYSTEM REPROGRAM
PROCEDURE)
No Go to next step.
Yes Go to next step.
No Repair wiring harness.
Yes Replace coil.
(See T–90 COIL REMOVAL/INSTALLATION)
No Repair wiring harness.
Yes Replace coil.
(See T–90 COIL REMOVAL/INSTALLATION)
No Go to next step.
A6E817067000W03
ACTION