Mazda CX-7 2007 Workshop Manual page 1332

ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)]
STEP
4 INSPECT COIL ANTENNA INPUT SIGNAL
CIRCUIT
• Turn the ignition switch to the LOCK position.
• Disconnect the instrument cluster connector.
• Turn the ignition switch to the ON position.
• Measure the voltage at instrument cluster
terminal 2S.
— Is the voltage 8 V or more?
5 INSPECT COMMUNICATION CIRCUIT
(INPUT) FOR CONTINUITY
• Turn the ignition switch to the LOCK position.
• Is there continuity between coil antenna terminal
B and instrument cluster terminal 2S?
6 INSPECT COIL ANTENNA INPUT SIGNAL
CIRCUIT
• Measure the resistance between coil antenna
terminal B and ground.
— Is the resistance 10 kilohms or more?
7 INSPECT COIL ANTENNA OUTPUT SIGNAL
CIRCUIT
• Connect the coil antenna connector and the
instrument cluster connector.
• Turn the ignition switch to the ON position.
• Measure the voltage at coil antenna terminal A.
— Is the voltage 8 V or more?
8 INSPECT COIL ANTENNA OUTPUT SIGNAL
CIRCUIT
• Turn the ignition switch to the LOCK position.
• Disconnect the coil antenna connector.
• Turn the ignition switch to the ON position.
• Measure the voltage at coil antenna terminal A.
— Is the voltage 8 V or more?
9 INSPECT COMMUNICATION CIRCUIT
(OUTPUT) FOR CONTINUITY
• Turn the ignition switch to the LOCK position.
• Disconnect the instrument cluster connector.
• Is there continuity between coil antenna terminal
A and instrument cluster terminal 2Q?
10 INSPECT COIL ANTENNA OUTPUT SIGNAL
CIRCUIT
• Measure the resistance between instrument
cluster terminal 2Q and ground.
— Is the resistance 10 kilohms or more?
End Of Sie
09-02C–6
INSPECTION
Yes Replace the instrument cluster and perform the
resetting procedure for the immobilizer system when
replacing the instrument cluster.
(See 09-22-2 INSTRUMENT CLUSTER REMOVAL/
INSTALLATION.)
(See 09-14-20 IMMOBILIZER SYSTEM COMPONENT
REPLACEMENT/KEY ADDITION AND
CLEARING[KEYLESS ENTRY SYSTEM].)
No Go to the next step.
Yes Go to the next step.
No Repair the wiring harness.
Yes Replace the coil antenna.
(See 09-14-11 COIL ANTENNA REMOVAL/
INSTALLATION.)
No Repair the wiring harness.
Yes Replace the coil antenna.
(See 09-14-11 COIL ANTENNA REMOVAL/
INSTALLATION.)
No Go to the next step.
Yes Replace the coil antenna.
(See 09-14-11 COIL ANTENNA REMOVAL/
INSTALLATION.)
No Go to the next step.
Yes Repair the wiring harness.
No Go to the next step.
Yes Replace the instrument cluster and perform the
resetting procedure for the immobilizer system when
replacing the instrument cluster.
(See 09-22-2 INSTRUMENT CLUSTER REMOVAL/
INSTALLATION.)
(See 09-14-20 IMMOBILIZER SYSTEM COMPONENT
REPLACEMENT/KEY ADDITION AND
CLEARING[KEYLESS ENTRY SYSTEM].)
No Repair the wiring harness.
ACTION