Mazda CX-7 2007 Workshop Manual page 1339

ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)]
STEP
2 VERIFY DTC
• Using the registered key, turn the ignition switch
to the ON position.
• Is the DTC displayed again?
— Security light: 21
— M-MDS: B1213/P1260
End Of Sie
SECURITY LIGHT 22, DTC B2141/P1260[IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)]
SECURITY LIGHT: 22
DTC: B1241/P1260
DETECTION CONDITION
POSSIBLE CAUSE
Diagnostic Procedure
STEP
1 VERIFY DTC
• Are either U1900 or U0073, or both displayed, by
either the instrument cluster or the PCM, or both?
2 VERIFY DTC
• Using the registered key, turn the ignition switch to
the ON position.
• Is the DTC displayed?
— Security light: 22
— M-MDS: B2141/P1260
3 EXAMINE INSTRUMENT CLUSTER AND PCM
• Is the DTC displayed again?
— Security light: 22
— M-MDS: B2141/P1260
4 EXAMINE PCM
• Is the DTC displayed again?
— Security light: 22
— M-MDS: B2141/P1260
End Of Sie
INSPECTION
Communication error between the instrument cluster and the PCM (data transfer error)
• Communication error between the instrument cluster and the PCM (data transfer error)
• Malfunction in the wiring harness (CAN line) between the instrument cluster and the PCM
• Instrument cluster malfunction
• PCM malfunction
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 DTC troubleshooting completed.
Yes Perform troubleshooting according to the
corresponding DTC inspection.
(See 09-02D-14 DTC U0073[MULTIPLEX
COMMUNICATION SYSTEM].)
No Go to the next step.
• Replace the PCM and perform the resetting
Yes
procedure for the immobilizer system when
replacing the PCM.
(See 09-14-20 IMMOBILIZER SYSTEM
COMPONENT REPLACEMENT/KEY ADDITION
AND CLEARING[KEYLESS ENTRY SYSTEM].)
• Go to the next step.
No DTC troubleshooting completed.
• Replace the instrument cluster and perform the
Yes
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].)
• Go to the next step.
No DTC troubleshooting completed.
• Replace the PCM and perform the resetting
Yes
procedure for the immobilizer system when
replacing the PCM.
(See 01-40-6 PCM REMOVAL/
INSTALLATION[L3 WITH TC].)
(See 09-14-20 IMMOBILIZER SYSTEM
COMPONENT REPLACEMENT/KEY ADDITION
AND CLEARING[KEYLESS ENTRY SYSTEM].)
No DTC troubleshooting completed.
ACTION
id0902e5801400
ACTION
09-02C–13
09-02C