Mazda 6 2002 Workshop Manual page 1014

ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM]
STEP
6 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 9 V?
7 INSPECT COIL OUTPUT SIGNAL CIRCUIT
• Turn ignition switch to OFF position.
• Disconnect PCM connector.
• Measure resistance between PCM connector
terminal 2Q and ground.
• Is resistance more than 10 kilohms?
8 INSPECT COIL OUTPUT SIGNAL CIRCUIT
FOR SHORT TO GND
• Disconnect coil connector.
• Measure resistance between coil connector
terminal A and ground.
• Is resistance more than 10 kilohms?
9 INSPECT COMMUNICATION CIRCUIT
(OUTPUT) FOR CONTINUITY
• Disconnect coil and PCM connectors.
• Is there continuity between coil connector
terminal A and PCM terminal 2Q?
10 INSPECT COMMUNICATION CIRCUIT
(OUTPUT) FOR CONTINUITY
• Disconnect coil and PCM connectors.
• Is there continuity between coil connector
terminal A and PCM terminal 2Q?
11 INSPECT COIL OUTPUT CIRCUIT FOR
SHORT TO POWER SUPPLY
• Disconnect coil connector.
• Measure voltage at terminal A of coil
connector.
• Is there voltage?
12 INSPECT PCM
• Turn ignition switch from LOCK position to
START position for 2 seconds.
• Does security light indicate DTC B1681
again?
End Of Sie
DTC B2103
DTC B2103 Coil not connected.
POSSIBLE • Defective Coil
CAUSE • Poor connection of coil connector
Diagnostic procedure
STEP
INSPECT CONNECTOR CONNECTION
—
• Is connector of coil and PCM connected
securely?
End Of Sie
T–162
INSPECTION
INSPECTION
Yes Go to Step 10.
No Go to net step.
Yes Go to Step 9.
No Go to net step.
Yes Replace coil.
(See T–90 COIL REMOVAL/INSTALLATION)
No Repair wiring harness.
Yes Replace PCM and reprogram immobilizer system.
(See T–90 IMMOBILIZER SYSTEM REPROGRAM
PROCEDURE)
No Repair wirimg harness.
Yes Replace coil.
(See T–90 COIL REMOVAL/INSTALLATION)
No Go to net step.
Yes Repair wirimg harness.
No Replace PCM and reprogram immobilizer system.
(See T–90 IMMOBILIZER SYSTEM REPROGRAM
PROCEDURE)
Yes Replace PCM and reprogram immobilizer system.
(See T–90 IMMOBILIZER SYSTEM REPROGRAM
PROCEDURE)
No Troubleshooting is completed.
Yes Replace coil.
(See T–90 COIL REMOVAL/INSTALLATION)
No Connect connector securely.
ACTION
A6E817067000W04
ACTION