Mazda CX-7 2007 Workshop Manual page 1425

SYMPTOM TROUBLESHOOTING [INSTRUMENT CLUSTER]
NO. 7 SPEEDOMETER INDICATION IS DEFECTIVE[INSTRUMENT CLUSTER]
7 Speedometer indication is defective
• DSC HU/CM malfunction
• PCM malfunction
• TCM 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, and drive the vehicle.
1
— Does the speedometer needle move
smoothly?
— Does the speedometer needle indicate
correct speed?
• Inspect the DTC for the instrument cluster
2
ON-BOARD DIAGNOSTIC SYSTEM.
• Has DTC U2023 been recorded in memory?
• Inspect the FREEZE FRAME DATA for DTC
3
U2023.
• Has the speedometer fall-safe function been
requested?
• Start the instrument cluster input/output
4
check mode.
• Inspect the speedometer using the check
code 12.
• Is the speedometer normal?
• Disconnect the negative battery cable.
5
• Measure the resistance between the DLC-2
terminals F and E.
• Is the resistance 54— 66 ohms?
• Disconnect the negative battery cable.
6
• Inspect the DLC-2 terminals F and E for
short to power supply or GND.
• Is there any malfunction?
• Turn the ignition switch off.
7
• 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.
8
• 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
End Of Sie
INSPECTION
2M 2K 2I 2G 2E 2C 2A
2N 2L 2J 2H 2F 2D 2B
Yes Troubleshooting completed.
No Go to the next step.
Yes Go to the next step.
No Go to Step 4.
Yes Inspect the DTC for the PCM, DTC HU/CM and TCM.
(See 01-02-7 ON-BOARD DIAGNOSTIC TEST[L3 WITH
TC].)
(See 04-02-3 ON-BOARD DIAGNOSIS.)
(See 05-02-3 AUTOMATIC TRANSAXLE ON-BOARD
DIAGNOSTIC FUNCTION[AW6A-EL, AW6AX-EL].)
No Go to the next step.
Yes Inspect the DSC HU/CM, or connectors.
No Replace the instrument cluster.
Yes Go to the next step.
No Go to Step 7.
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.
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ACTION
09-03C–7
09-03C