Mazda 2002 6 - Security Light: Dtc

T–162
ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM]
End Of Sie
SECURITY LIGHT: DTC 11 (WDS OR EQUIVALENT: DTC B1681)
A6E817067000W03
Diagnostic procedure
DTC 11 (B1681) Coil signal is not received.
POSSIBLE
CAUSE
• Defective wiring harness
• Defective coil
• Defective PCM
COIL
HARNESS SIDE CONNECTOR
ABCD
PCM
HARNESS SIDE CONNECTOR
2T 2Q
STEP INSPECTION ACTION
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?
Yes Go to next step.
No Repair wiring harness.
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?
Yes Go to next step.
No Repair wiring harness.
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?
Yes Go to Step 7.
No Go to next step.
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?
Yes Replace PCM and reprogram immobilizer system.
(See T–90 IMMOBILIZER SYSTEM REPROGRAM
PROCEDURE)
No Go to next step.
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?
Yes Go to next step.
No Repair wiring harness.
6 INSPECT COIL INPUT SIGNAL CIRCUIT
• Measure resistance between coil connector
terminal B and ground.
• Is resistance more than 10 kilohms?
Yes Replace coil.
(See T–90 COIL REMOVAL/INSTALLATION)
No Repair wiring harness.
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?
Yes Replace coil.
(See T–90 COIL REMOVAL/INSTALLATION)
No Go to next step.