Mazda CX-7 2007 Workshop Manual page 1423

SYMPTOM TROUBLESHOOTING [INSTRUMENT CLUSTER]
NO. 4 MIL ILLUMINATES[INSTRUMENT CLUSTER]
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4 MIL illuminates
• PCM malfunction
• Instrument cluster malfunction
• Connector or pin malfunction
POSSIBLE
• Short circuit in wiring harness between CAN-L, CAN-H and GND
CAUSE
• Open circuit in CAN wiring harness (CAN-L, CAN-H)
• CAN wiring harness (CAN-L, CAN-H) short each other
Diagnostic procedure
STEP
• Start the engine.
1
• Does the MIL turn off?
• Inspect the DTC for the instrument cluster
2
ON-BOARD DIAGNOSTIC SYSTEM.
• Have DTCs U2064 or U2023 been recorded
in memory?
• Disconnect the negative battery cable.
3
• Measure the resistance between the DLC-2
terminals F and E.
• Is the resistance 54— 66 ohms?
• Inspect the DLC-2 terminals F and E for
4
short to power supply or GND.
• Is there any malfunction?
• Turn the ignition switch off.
5
• Inspect the instrument cluster connector
terminals for poor connection (such as
damaged/pulled-out pins, and corrosion).
• Are the terminals normal?
• Disconnect the negative battery cable.
6
• Measure the resistance between the
instrument cluster connector terminals 2R
and 2T.
• Is the resistance 114— 126 ohms?
2W 2U 2S 2Q 2O
2X 2V 2T 2R 2P
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NO. 5 BRAKE SYSTEM WARNING LIGHT ILLUMINATES[INSTRUMENT CLUSTER]
5 Brake system warning light illuminates
• DSC HU/CM malfunction
• Brake fluid level sensor malfunction
• Parking brake switch malfunction
• Instrument cluster malfunction
POSSIBLE
• Connector or pin malfunction
CAUSE
• Short circuit in wiring harness between CAN-L, CAN-H and GND
• Open circuit in CAN wiring harness (CAN-L, CAN-H)
• CAN wiring harness (CAN-L, CAN-H) short each other
Diagnostic procedure
STEP
• Start the engine.
1
• Release the parking brake.
• Does the brake system warning light turn
off?
• Does the brake fluid need replenishment?
2
INSPECTION
2M 2K 2I 2G 2E 2C 2A
2N 2L 2J 2H 2F 2D 2B
INSPECTION
Yes Troubleshooting completed.
No Go to the next step.
Yes Inspect the DTC for the PCM.
(See 01-02-7 ON-BOARD DIAGNOSTIC TEST[L3 WITH
TC].)
No Go to the next step.
Yes Go to the next step.
No Go to Step 5.
Yes Inspect the wiring harness and CAN system-related module.
Repair or replace the malfunctioning part.
No Replace the instrument cluster.
Yes Go to the next step.
No Repair or replace the terminal.
Yes Inspect the wiring harness and CAN system-related module.
Repair or replace the malfunctioning part.
No Replace the instrument cluster.
Yes Troubleshooting completed.
No Go to the next step.
Yes Add brake fluid.
No Go to the next step.
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09-03C–5
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