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Home >> Mazda >> 2000 >> 626 ES L4-2.0L DOHC >> Repair and Diagnosis >> Accessories and Optional Equipment >> Antitheft and Alarm Systems >> Service and Repair >> Key/Steering Lock/Immobilizer Unit/PCM Replacement

Key/Steering Lock/Immobilizer Unit/PCM Replacement

NOTE:
- When an error occurs during the reprogram procedures, except when both the immobilizer unit and PCM are replaced, repeat the procedure from Step 1. If you still cannot reprogram, confirm how many keys can start the engine. Then, perform the key replacement or addition reprogram procedure according to the valid key number.
- To make a copy of the key or replace the immobilizer system component parts (the key(s), steering lock, immobilizer unit and/or PCM), customer should bring all keys to the dealer. This is because the previously programmed key IDs are erased when reprogramming the key IDs into the immobilizer unit and PCM.
- If the customer has only one valid key when replacing the immobilizer system component parts, the dealer should contact a distributor to obtain the code word.
To replace the immobilizer unit or PCM, there should be at least one valid key. Otherwise, both the immobilizer unit and PCM should be replaced.
- The immobilizer unit and PCM cannot be changed from one car to another. If the immobilizer unit or PCM is replaced with one from another car, the engine will not start. Reprogramming of the IDs and code word of an immobilizer unit that has already programmed as a set is not possible.
- The immobilizer unit and PCM should not be newly replaced as a trial during troubleshooting. If this is done, the ID and code word will be programmed into the new unit and it cannot be used for other cars even if you find that the old unit was normal.
- The immobilizer system cannot be deactivated.
- Confirm that all keys registered can start the engine after the reprogram procedure. When confirming, wait for more than 5 seconds before inserting the next key.
- When the customer does not need to register more than two keys, the following procedures can be stopped after registering two keys.

Key Replacement or Addition




When the customer has two or more valid keys

NOTE: If no specific time interval is given, each step should be performed within 30 seconds of the previous step.

1. Cut new transponder equipped key(s).
2. Using key 1, turn ignition switch to ON then back to LOCK five times.

NOTE: Key should not remain at ON or LOCK for more than one second.

1. Turn key 1 back to ON. Observe illumination of security light in instrument panel.
2. Turn key 1 to LOCK and remove key 1 from steering lock. Observe security light goes out.

3. Using key 2, start engine. Observe security light illuminates (for 1 - 2 seconds) and engine continues to run.
1. Turn key 2 to LOCK and remove from steering lock.

4. Repeat step 3 with key 1.
5. Repeat step 3 with key 3.
6. If there are 4 - 8 keys (valid and/or new keys), repeat step 3.
7. Wait for 30 seconds to quit reprogram mode.




When the customer has only one or no valid key (code word is required)

NOTE: If no specific time interval is given, each step should be performed within 30 Seconds of the previous step.

1. Cut new transponder equipped key(s).
2. Using key 1, turn ignition switch to ON then back to LOCK five times.

NOTE: Key should not remain at ON or LOCK for more than one second.

1. Turn key 1 back to ON. Observe flashing of security light (300 ms ON - 300 ms OFF) in instrument panel.
2. Turn key 1 to LOCK and wait for 5 minutes until security light decreases in flashing frequency to 1.2 seconds.
3. Input code word. (See CODE WORD INPUT PROCEDURE.)
4. Observe security light stops flashing and illuminates.
5. Start engine with key 1. Observe security light illuminates (about 1 - 2 seconds) and engine continues to run.
6. Turn key 1 to LOCK and remove from steering lock.

3. Using key 2, start engine. Observe security light illuminates (for 1 - 2 seconds) and engine continues to run.
1. Turn key 2 to LOCK and remove from steering lock.

4. Repeat step 3 with key 3.
5. If there are 4 - 8 keys (valid and/or new keys), repeat step 3.
6. Wait for 30 Seconds to quit reprogram mode.

Steering Lock Replacement




When the customer has two or more valid keys from old steering lock

NOTE:
- When replacing the steering lock, the coil and keys should be replaced as a set.
- If no specific time interval is given, each step should be performed within 30 Seconds of the previous step.

1. Remove old steering lock. (See STEERING SHAFT COMPONENT DISASSEMBLY/ASSEMBLY.)
2. Connect new steering lock to ignition switch connector.
3. Connect old steering lock to coil connector as shown in figure.
4. Insert key 1 into old steering lock.

5. Insert key 3 into new steering lock and turn to ON then back to LOCK five times. Key should not remain at ON or LOCK for more than one second.
1. Turn key 3 back to ON. Observe illumination of security light in instrument panel.
2. Turn key 3 to LOCK. Observe security light goes out.

NOTE: Operate next two steps within 30 Seconds of step 5-(2).

6. Remove key 1 from old steering lock and insert key 2 into old steering lock.
7. Using key 3 of new steering lock, start engine. Observe security light illuminates (for 1 - 2 seconds) and engine continues to run.
1. Turn key 3 to LOCK.

NOTE: Operate next two steps within 30 Seconds of step 7-(1).

8. Disconnect coil connector from old steering lock, and reconnect coil connector to new steering lock.
9. Using key 3 of new steering lock, start engine. Observe security light illuminates (for 1 - 2 seconds) and engine continues to run.
1. Turn key 3 to LOCK and remove from steering lock.

10. Repeat step 9 with key 4.
11. Repeat step 9 with key 5.
12. Wait for 30 Seconds to quit reprogram mode.
13. Install new steering lock.




When the customer has only one or no valid key (code word is required)

NOTE:
- When replacing the steering lock, the coil and keys should be replaced as a set.
- If no specific time interval is given, each step should be performed within 30 Seconds of the previous step.

1. Replace steering lock. (See STEERING SHAFT COMPONENT DISASSEMBLY/ASSEMBLY.)
2. Using key 1, turn ignition switch to ON then back to LOCK five times. Key should not remain ON or LOCK for more than one second.
1. Turn key 1 back to ON. Observe flashing of security light (300 ms ON - 300 ms OFF) in instrument panel.
2. Turn key 1 to LOCK and wait for 5 minutes until security light decreases in flashing frequency to 1.2 seconds.
3. Input code word. (See CODE WORD INPUT PROCEDURE.)
4. Observe the security light stops flashing and illuminates.
5. Start engine with key 1. Observe security light illuminates (about 1 - 2 seconds) and engine continues to run.
6. Turn key 1 to LOCK and remove from steering lock.

3. Using key 2, start engine. Observe security light illuminates (for 1 - 2 seconds) and engine continues to run.
1. Turn key 2 to LOCK and remove from steering lock.

4. Repeat step 3 with key 3.
5. Wait for 30 Seconds to quit reprogram mode.

Immobilizer Unit Replacement

When the customer does not have valid key
- PCM needs to be replaced with immobilizer unit. Perform "Both Immobilizer unit and PCM Replacement" of the IMMOBILIZER SYSTEM REPROGRAMMING PROCEDURE.




When the customer has at least one valid key (code word Is required)

NOTE: If no specific time interval is given, each step should be performed within 30 Seconds of the previous step.

1. Cut new transponder equipped key(s) if necessary.
2. Replace immobilizer unit.
3. Using key 1, start engine. Observe security light illuminates (for 1 - 2 seconds) and engine continues to run.
1. Turn key 1 to LOCK and remove from steering lock.

4. Using key 2, turn ignition switch to ON then back to LOCK five times. Key should not remain at ON or LOCK for more than one second.
1. Turn key 2 back to ON. Observe flashing of security light (300 ms ON - 300 ms OFF) in instrument panel.
2. Turn key 2 to LOCK and wait for 5 minutes until security light decreases in flashing frequency to 1.2 seconds.
3. Input code word. (See CODE WORD INPUT PROCEDURE.)
4. Observe the security light stops flashing and illuminates.
5. Start engine with key 2. Observe security light illuminates (about 1 - 2 seconds) and engine continues to run.
6. Turn key 2 to LOCK and remove from steering lock.

5. Using key 1, start engine. Observe security light illuminates (for 1 - 2 seconds) and engine continues to run.
1. Turn key 1 to LOCK and remove from steering lock.

6. Repeat step 5 with key 3.
7. If there are 4 - 8 keys (valid and/or new keys), repeat step 5.
8. Wait for 30 Seconds to quit reprogram mode.

PCM Replacement

When the customer does not have valid key

NOTE:
- Immobilizer unit needs to be replaced with PCM. Perform "Both Immobilizer unit and PCM Replacement" of the IMMOBILIZER SYSTEM REPROGRAM PROCEDURE.
- If no specific time interval is given, each step should be performed within 30 Seconds of the previous step.




When the customer has two or more valid keys
1. Cut new transponder equipped key(s) if necessary.
2. Replace PCM.
3. Using key 1, turn ignition switch to ON, and observe security light illuminates (for 1 - 2 seconds) in instrument panel.
1. Turn key 1 to LOCK.
2. Turn key 1 to ON then back to LOCK six times. Key should not remain at ON or LOCK for more than one second. It is particularly important to ensure that the 6th turn is done within 1 second.
3. Remove key 1.

4. Using key 2, turn ignition switch to ON. Observe security light illuminates (for 1 - 2 seconds).
1. Turn key 2 to LOCK and remove from steering lock.

5. Using key 1, start engine. Observe security light illuminates (for 1 - 2 seconds) and engine continues to run.
1. Turn key 1 to LOCK and remove from steering lock.

6. Repeat step 5 with key 3.
7. If there are 4 - 8 keys (valid and/or new keys), repeat step 5.
8. Wait for 30 Seconds to quit reprogram mode.
9. After reprogramming, clear DTCs of PCM with NGS.




When the customer has only one valid key (code word is required)

NOTE: If no specific time interval is given, each step should be performed within 30 Seconds of the previous step.

1. Cut new transponder equipped key(s) if necessary.
2. Replace PCM.
3. Using key 3, turn ignition switch to ON. Observe security light illuminates (for 1 - 2 seconds) in instrument panel.
1. Turn key 3 to LOCK and remove from steering lock.

4. Using key 1, turn ignition switch to ON then back to LOCK six times. Key should not remain at ON or LOCK for more than one second. It is particularly important to ensure that the 6th turn is done within 1 second.
1. Observe flashing of security light (300 ms ON - 300 ms OFF) in instrument panel.
2. Wait for 5 minutes until security light decreases in flashing frequency to 1.2 seconds.
3. Input code word. (See CODE WORD INPUT PROCEDURE.)
4. Observe the security light stops flashing and illuminates.
5. Turn key 1 to ON. Observe security light illuminates (about 1 - 2 seconds).
6. Turn key 1 to LOCK and remove from steering lock.

5. Using key 2, start engine. Observe security light illuminates (for 1 - 2 seconds) and engine continues to run.
1. Turn key 2 to LOCK and remove from steering lock.

6. Repeat step 5 with key 3.
7. If there are 4 - 8 keys (valid and/or new keys), repeat step 5.
8. Wait for 30 Seconds to quit reprogram mode.
9. After reprogramming, clear DTCs of PCM with NGS.

Both Immobilizer Unit and PCM Replacement

When the customer has two or move valid keys

NOTE:
- Keys may be valid or new keys.
- When an error occurs in steps 1 to 4, repeat the procedure from step 1.
- When an error occurs in step 5, perform the "Reprogram error recovery procedure for both immobilizer unit and PCM replacement".
- If no specific time interval is given, each step should be performed within 30 Seconds of the previous step.

1. Cut new transponder equipped key(s) if necessary.
2. Replace immobilizer unit and PCM.
3. Using key 1, turn ignition switch to ON. Observe security light illuminates and then goes out in instrument panel.
1. Turn key 1 to LOCK. Observe security light blinks once repeatedly.

4. Using key 2, turn ignition switch to ON. Observe security light illuminates and then goes out.
1. Turn key 2 to LOCK. Observe security light blinks twice repeatedly.

5. Using key 3, turn ignition switch to ON. Observe security light illuminates and then goes out.
1. Turn key 3 to LOCK. Observe security light blinks three times repeatedly.

6. If there are 4 - 8 keys (valid and/or new keys), repeat step 4.
7. Wait for 30 Seconds to quit reprogram mode.
8. After reprogramming, clear DTCs of PCM with NGS.

Reprogram error recovery procedure for both immobilizer unit and PCM replacement

NOTE: If no specific time interval is given, each step should be performed within 30 Seconds of the previous step.

1. Using key 1, start engine. After security light illuminates for 1 - 2 seconds, turn key 1 to LOCK.
2. Using key 1, turn ignition switch to ON then back to LOCK five times. Key should not remain at ON or LOCK for more than one second.
3. Using key 1, turn ignition switch to ON (security light illuminates).
4. Turn key 1 to LOCK and remove from steering lock (security light goes out).
5. Using key 2, start engine. Observe security light illuminates (about 1 - 2 seconds) and engine continues to run.
6. Turn key 2 to LOCK and remove from steering lock.
7. Repeat step 5 and 6 with key 1.
8. Repeat step 5 and 6 with key 3.
9. If there are 4 - 8 keys (valid and/or new keys), repeat step 5 and 6.
10. Wait for 30 Seconds to quit reprogram mode.
11. After reprogramming, clear DTCs of PCM with NGS.



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