DTC C1446 [DSC/RSC] DIAGNOSTIC PROCEDURE
STEP
INSPECTION
ACTION
1
VERIFY OPEN OR SHORT CIRCUIT
IN BRAKE SWITCH SIGNAL
z
Turn the ignition switch to the ON
position.
z
Measure the voltage between the
PCM terminal 1T and body ground
when the brake pedal is depressed
and released:
Voltage
Brake pedal depressed: B+
Brake pedal released:
1 V or less
Yes Go to Step 5.
No
If it is B+ under any condition, then go to the next
step. If it is 1 V or less under any condition, then
go to Step 3.
2
INSPECT BRAKE SWITCH SIGNAL
FOR SHORT TO POWER SUPPLY
CIRCUIT
z
Disconnect the brake switch
connector.
z
Measure the voltage between the
brake switch connector terminal D
(vehicle harness-side) and body
ground.
z
Is the voltage
1 V or less
?
Yes Go to Step 4.
No Repair or replace the wiring harness between the
PCM and brake switch, then go to Step 5
3
INSPECT BRAKE SWITCH SIGNAL
FOR OPEN CIRCUIT
z
Disconnect the PCM connectors.
z
Disconnect the brake switch
connector.
z
Inspect continuity between the PCM
connector terminal 1T (vehicle
harness-side) and brake switch
terminal D:
z
Is there continuity?
Yes Go to the next step.
No
Repair or replace the wiring harness between the
PCM and brake switch, then go to Step 5.
INSPECT BRAKE SWITCH
z
Inspect the brake switch.
Yes Go to the next step.
2008 Mazda CX-9 Grand Touring
2008 BRAKES On-Board Diagnostic (DSC/RSC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 9:50:13 AM
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