10C
DTC 13: No Transponder Code Transmitted or Coil Antenna Opened/Shorted
Wiring Diagram
1. Main fuse 3-1. Immobilizer Control Module
(Vehicle not equipped with air bag system) 		4. Coil antenna
2. Main relay 3-2. Immobilizer Control Module
(Vehicle equipped with air bag system) 		5. To ECM
System Description
Immobilizer Control Module energizes the coil antenna when the ignition switch is ON and reads Transponder code from the ignition key. When Immobilizer Control Module cannot read Transponder code from the ignition key even when the coil antenna is energized, this DTC is set.
Troubleshooting
Vehicle not equipped with air bag system
Step Action YES NO
1
1) Check that knob shape and color for ignition key are as shown below.
• Knob color: Black
• Knob shape: The same as shown in the figure.
Is it the original one?
Go to Step 2.
Replace ignition key with original one and follow Immobilizer Control System Check:M13A Model again.
2
1) Disconnect coil antenna coupler (1) with ignition switch turned OFF.
Is there continuity between coil antenna coupler terminals A and B?
Go to Step 3.
Coil antenna open.
3
1) Measure resistance between terminals of coil antenna coupler (1) and body ground.
Is it ∞ (infinity) Ω?
Go to Step 4.
Coil antenna shorted to ground.
4
1) With coil antenna coupler disconnected, disconnect Immobilizer Control Module coupler.
2) Measure resistance between coil antenna terminal of Immobilizer Control Module coupler (1).
Is it ∞ (infinity) Ω?
Go to Step 5.
“P/B” wire shorted to “Gr/R” wire.
5
1) Measure resistance between terminal “G38-4” of Immobilizer Control Module coupler (1) and body ground.
Is it ∞ (infinity) Ω?
Go to Step 6.
“P/B” wire shorted to ground.
6
1) Measure resistance between terminal “G38–3” of Immobilizer Control Module coupler (1) and body ground.
Is it ∞ (infinity) Ω?
Go to Step 7.
“Gr/R” wire shorted to ground.
7
1) Connect coil antenna coupler.
Is there continuity between Immobilizer Control Module coupler (1) terminals “G38-4” and “G38-3”?
Go to Step 8.
“P/B” or “Gr/R” wire open. Poor coil antenna-to-coupler.
8
1) If connection are OK, connect Immobilizer Control Module coupler and substitute a known-good coil antenna.
Is DTC 13 also indicated with ignition switch turned ON?
Go to Step 9.
Faulty coil antenna.
9
Is DTC 13 still indicated even when another ignition key (with built-in transponder) for that vehicle used?
Substitute a known-good Immobilizer Control Module and recheck. See NOTE.
Faulty transponder.
NOTE:
After replacing with a known-good Immobilizer Control Module, register ECM/Immobilizer Control Module code in ECM and Transponder code and ECM/Immobilizer Control Module code in Immobilizer Control Module by performing procedure described in Procedure after Immobilizer Control Module Replacement:M13A Model .
Vehicle equipped with air bag system
Step Action YES NO
1
1) Check that knob shape and color for ignition key are as shown below.
• knob color: Dark gray
• knob shape: The same as shown in the figure.
Substitute a known-good Immobilizer Control Module and recheck. See NOTE.
Replace ignition key with original one and follow Immobilizer Control System Check:M13A Model again.
NOTE:
After replacing with a known-good Immobilizer Control Module, register ECM/Immobilizer Control Module code in ECM and Transponder code and ECM/Immobilizer Control Module code in Immobilizer Control Module by performing procedure described in Procedure after Immobilizer Control Module Replacement:M13A Model .