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Acura CSX. Manual - part 569

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Order of

Priority

Symptom

Possible cause

22-323

Symptom Troubleshooting

1. Troubleshoot the immobilizer system by the order of the priority shown:

•

Immobilizer indicator blinks.

Symptom troubleshooting (see page 22-324).

Engine does not start with the immobilizer key.

Symptom troubleshooting (see page 22-325).

Immobilizer indicator does not come on.

Check the MIL indication.

If the MIL comes on, go to the PGM-FI System
MIL circuit troubleshooting (see page 11-203).
If the MIL does not come on, replace the gauge
control module (tach).

Immobilizer indicator does not go off.

Symptom troubleshooting (see page 22-325).

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０１

０２

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−

Immobilizer indicator blinks

YES

22-324

Immobilizer System

IMMOBILIZER-KEYLESS CONTROL UNIT 7P CONNECTOR

IG1 (YEL)

IMMOBILIZER-KEYLESS CONTROL UNIT 7P CONNECTOR

LG (BLK)

NOTE: Before troubleshooting, check the items listed in
‘‘General Check before Troubleshooting’’.

1. Turn the ignition switch to LOCK (0).

2. Connect the HDS, then turn the ignition switch to

ON (II).

3. Enter the IMMOBILIZER, then select the

IMMOBILIZER SETUP.

4. Select the SYSTEM CHECK.

Troubleshoot the immobilizer system

according to the result of the SYSTEM CHECK
(see page 22-326).

Go to step 5.

5. Turn the ignition switch to LOCK (0).

6. Enter the vehicle, and remove the ignition key from

the ignition switch, then close the all doors.

7. Operate the keyless transmitter LOCK and UNLOCK

several times in the vehicle.

Go to step 8.

Check for a poor ground (G101) and/or an

open in the wire between immobilizer-keyless
control unit 7P connector terminal No. 7 and body
ground (G101).

8. Turn the ignition switch to ON (II).

9. Measure the voltage between immobilizer-keyless

control unit 7P connector terminal No. 2 and body
ground.

Go to step 10.

Repair open in the YEL wire between the

under-dash fuse/relay box and the immobilizer-
keyless control unit.

10. Measure the voltage between immobilizer-keyless

control unit 7P connector terminal No. 7 and body
ground.

Repair poor connection or open between

immobilizer-keyless control unit 7P connector
terminal No. 7 and G101.

Replace the immobilizer-keyless control unit

(see page 22-332).

Wire side of female terminals

Is the SY ST EM CHECK indicated?

Do the door lock actuator s wor k nor mally?

Is ther e batter y voltage?

Is ther e 0.5 V or mor e?

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−

Engine does not start with the immobilizer
key

Immobilizer indicator does not go off

YES

22-325

NOTE: Before troubleshooting, check the items listed in
‘‘General Check before Troubleshooting’’ and ‘‘How to
Troubleshoot’’ (see page 22-322).

1. Try to start the engine.

Intermittent failure, the system is OK at this

time. Check status log (see page 22-328).

Go to step 2.

2. Turn the ignition switch to LOCK (0).

3. Turn the ignition switch to ON (II), and check the

immobilizer indicator.

Go to step 4.

Go to the immobilizer indicator blinks

troubleshooting (see page 22-324).

4. Turn the ignition switch to START (III).

Go to step 5.

Go to Starting System and check the starter

motor (see page 4-6).

5. Try to start the engine with the immobilizer key.

Go to step 6.

Go to the PGM-FI System Symptom

Troubleshooting.

6. Wait for a few minutes with the engine running.

Go to the PGM-FI System Symptom

Troubleshooting.

The system is OK at this time.

1. Turn the ignition switch to LOCK (0).

2. Connect the HDS to the data link connector.

3. Turn the ignition switch to ON (II).

4. Enter IMMOBILIZER, then select the IMMOBILIZER

INFORMATION.

5. Do the SYSTEM CHECK with the HDS.

Replace the gauge control module (tach)

(see page 22-277).

Substitute a known-good immobilizer-keyless

control unit, then register it and recheck. If the
symptom goes away, replace the original
immobilizer-keyless control unit (see page 22-332).

Does the engine star t?

Does the indicator come on f or 2 seconds, then go
of f ?

Does the star ter motor r un?

Does the engine star t?

Does the engine stop?

Is N-1 OK indicated?

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System

Check No.

System Check

Possible Cause

22-326

Immobilizer System

System Check

1. Connect the HDS to the data link connector.

2. Turn the ignition switch to ON (II).

3. Monitor the SYSTEM CHECK in the IMMOBILIZER INFO with the HDS.

4. If the HDS displays NORMAL N-1, the immobilizer system is OK at this time, refer to the STATUS LOG. If the HDS

displays any other messages, check as follows:

•

•
•

•
•
•

•
•
•
•
•

•
•
•

•

•
•

•

A-1

The key is not
registered

This key is not registered in the immobilizer-keyless control unit. Try
to register keys using the HDS.
No communication between the antenna and the immobilizer key
because of interference from metal such as key chains/key rings/
other keys.
Low battery voltage.

A-2

Communication
error between the
key and
immobilizer unit

Intermittent interruption between transponder and immobilizer-
keyless control unit.
The immobilizer key type is incorrect non-Acura key.
Key failure (transponder failure)
No communication between the antenna and the immobilizer key
because of interference from metal such as key chains/key rings/
other keys.
Low battery voltage.

A-3

No communication
between the key
and immobilizer
unit

The ignition switch was turned to ON (II) with a non-immobilizer key.
The immobilizer key type is incorrect non-Acura key.
Key failure (transponder failure)
No communication between the antenna and the immobilizer key
because of interference from metal such as key chains/key rings/
other keys.
Low battery voltage.
Immobilizer-keyless control unit failure

B-1

The ECM/PCM is
not registered

The ECM/PCM was not registered. Try to register the ECM/PCM
using the HDS.
No communication between the ECM/PCM and the immobilizer-
keyless control unit because of low battery voltage.
No communication between the immobilizer-keyless control unit
and the ECM/PCM because of interference.
Open in the IG1 line

B-2

Error of
communication
format in ECM/
PCM

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