Specifications

ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM]
T161
T
Note
• Perform the following if the security light stays on:
 If gasoline engine stalls, go to symptom troubleshooting NO.11 ENGINE STALLS/QUITS, ENGINE
RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES in. (See F204 NO.11
ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/
STUMBLE, SURGES.)
 If gasoline engine wont start, go to symptom troubleshooting NO.6 CRANKS NORMALLY BUT WILL
NOT START in. (See F195 NO.6 CRANKS NORMALLY BUT WILL NOT START.)
 If engine condition is normal but light stays on, inspect for continuity between the following wiring
harness and body ground: security light and PCM connector terminal 2W. Repair or replace the wiring
harness.
End Of Sie
DTC B1681
A6E817067000W03
Diagnostic procedure
DTC B1681 Coil signal is not received.
POSSIBLE
CAUSE
• Defective coil
• Defective PCM
• Defective wiring harness
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 10 V?
Yes Go to next step.
No Repair wiring harness.
2 INSPECT WIRING HARNESS BETWEEN COIL
AND GROUND
• Turn ignition switch to OFF 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 9 V?
Yes Go to Step 5.
No Go to next step.
4 INSPECT COIL INPUT SIGNAL CIRCUIT
• Turn ignition switch to OFF position.
• Disconnect coil connector.
• Measure resistance between coil connector
terminal B and ground.
• Is resistance more than 10 kilohms?
Yes Go to Step 12.
No Repair wiring harness.
5 INSPECT COMMUNICATION CIRCUIT
(INPUT) FOR CONTINUITY
• Disconnect coil and PCM connectors.
• Is there continuity between coil connector
terminal B and PCM terminal 2T?
Yes Go to next step.
No Repair wirimg harness.