Use the following procedure to troubleshoot the immobiliser system.
*: Use the GTS.
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In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
The following 5 items are important points for problem analysis:
| What | Vehicle model, system name |
| When | Date, time, occurrence frequency |
| Where | Whether the problem occurs at a specific location |
| Under what conditions? | Whether the doors were locked or unlocked, whether the ignition switch was ON, whether the engine was running |
| How did it happen? | Problem symptoms |
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Measure the battery voltage.
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
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Check for DTCs and note any codes that are output.
Before checking for DTCs, perform the "DTC Output Confirmation Operation" of each diagnostic procedure.
| Result | Proceed to |
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| DTCs are not output | A |
| SFI system DTCs are output | B |
| ECD system DTCs are output (for 1GD-FTV (w/ EGR Cooler)) | C |
| ECD system DTCs are output (for 1GD-FTV (w/ DPF)) | D |
| ECD system DTCs are output (for 1GD-FTV (w/o EGR Cooler)) | E |
| ECD system DTCs are output (for 1GD-FTV (for Water Cooled Type Intercooler)) | F |
| ECD system DTCs are output (for 1GD-FTV (w/ Urea SCR System)) | G |
| ECD system DTCs are output (for 1GD-FTV (w/ Exhaust Gas Temperature Sensor for EGR)) | H |
| Immobiliser system DTCs are output | I |
A
B
C
D
E
F
G
H
I
Check for DTCs and note any codes that are output.
Before checking for DTCs, perform the "DTC Output Confirmation Operation" of each diagnostic procedure.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| Immobiliser system DTCs are output | B |
A
B
Refer to Problem Symptoms Table.
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| Fault is not listed in Problem Symptoms Table | A |
| Fault is listed in Problem Symptoms Table | B |
A
B
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If the transponder key ECU assembly, ECM, or door control transmitter assembly are replaced, refer to Service Bulletin.
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Clear the DTCs.
Check for DTCs.
Before checking for DTCs, perform the "DTC Output Confirmation Operation" of each diagnostic procedure.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| Immobiliser system DTCs are output | B |
A
B