Mazda CX-7 2007 Workshop Manual page 1325

[IMMOBILIZER SYSTEM (ADVANCED KEYLESS SYSTEM)]
SECURITY LIGHT 22, DTC B2141/P1260[IMMOBILIZER SYSTEM (ADVANCED KEYLESS 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 keyless control module 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 KEYLESS CONTROL MODULE
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
ON-BOARD DIAGNOSTIC
Communication error between the keyless control module and the PCM (data transfer error)
• Communication error between the keyless control module and the PCM (data transfer error)
• Malfunction in the wiring harness (CAN line) between the keyless control module and the
PCM
• Keyless control module malfunction
• PCM malfunction
INSPECTION ACTION
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 09-14-11 IMMOBILIZER SYSTEM
COMPONENT REPLACEMENT/KEY ADDITION
AND CLEARING[ADVANCED KEYLESS
SYSTEM].)
• Go to the next step.
No DTC troubleshooting completed.
• Replace the keyless control module and perform
Yes
the resetting procedure for the immobilizer
system when replacing the keyless control
module.
(See 09-14-30 KEYLESS CONTROL MODULE
REMOVAL/INSTALLATION[ADVANCED
KEYLESS SYSTEM].)
(See 09-14-11 IMMOBILIZER SYSTEM
COMPONENT REPLACEMENT/KEY ADDITION
AND CLEARING[ADVANCED KEYLESS
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 09-14-11 IMMOBILIZER SYSTEM
COMPONENT REPLACEMENT/KEY ADDITION
AND CLEARING[ADVANCED KEYLESS
SYSTEM].)
No DTC troubleshooting completed.
id0902e3801400
09-02B
09-02B–13