ELECTRIC PARKING BRAKE AUTOMATIC RELEASE FUNCTION DURING ACCELERATION OPERATION TOO EARLY/LATE ON SLOPE [ELECTRIC PARKING BRAKE (US)]
ELECTRIC PARKING BRAKE AUTOMATIC RELEASE FUNCTION DURING ACCELERATION OPERATION TOO EARLY/LATE ON SLOPE [ELECTRIC PARKING BRAKE (US)]
SM2565951
id040328250734
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Troubleshooting item |
Electric parking brake automatic release function during acceleration operation too early/late on slope |
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Description
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• Electric parking brake is released too early when the electric parking brake automatic release function during acceleration is operated on a slope.
• Electric parking brake is released too late when the electric parking brake automatic release function during acceleration is operated on a slope.
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Possible cause
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• DSC HU/CM malfunction
• Back-up light switch connector or terminal malfunction
• Back-up light switch malfunction
• Open circuit in back-up light switch ground circuit
• PCM connector or terminal malfunction
• Short to ground in back-up light switch signal circuit
• Short to power supply in back-up light switch signal circuit
• PCM malfunction
• Open circuit in back-up light switch signal circuit
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Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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VERIFY ALL SYSTEM DTCs
• Switch the ignition off.
• Switch the ignition ON (engine off or on) and wait for 10 s or more.
• Perform a DTC inspection using the M-MDS. (See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [DSC HU/CM (US)].)
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No
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Go to the next step.
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2
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VERIFY IF THE ELECTRIC PARKING BRAKE WARNING LIGHT IS TURNED ON
• Verify if the electric parking brake warning light is turned on.
• Is the electric parking brake warning light turned on?
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Yes
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Perform an inspection referring to “ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON”.
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No
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ATX:
• Replace the DSC HU/CM, and perform the repair completion verification. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (US)].)
MTX:
• Go to the next step.
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3
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VERIFY IF BACK-UP LIGHTS ARE ILLUMINATED
• Shift the shift lever to the reverse position.
• Are the back-up lights illuminated?
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Yes
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Replace the DSC HU/CM, and perform the repair completion verification.
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No
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Go to the next step.
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4
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INSPECT BACK-UP LIGHT SWITCH CONNECTOR CONDITION
• Switch the ignition off.
• Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Disconnect the back-up light switch connector.
• Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
• Is the connector normal?
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Yes
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Go to the next step.
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No
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Repair or replace the connector, and perform the repair completion verification.
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5
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INSPECT BACK-UP LIGHT SWITCH
• Inspect the back-up light switch. (See BACK-UP LIGHT SWITCH INSPECTION.)
• Is the back-up light switch normal?
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Yes
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Go to the next step.
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No
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Replace the back-up light switch, and perform the repair completion verification.
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6
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INSPECT BACK-UP LIGHT SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT
• Inspect the ground circuit for an open circuit. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location, and perform the repair completion verification.
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7
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INSPECT PCM CONNECTOR CONDITION
• Disconnect the PCM connector.
• Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
• Is the connector normal?
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Yes
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Go to the next step.
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No
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Repair or replace the connector, and perform the repair completion verification.
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8
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INSPECT BACK-UP LIGHT SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
• Inspect the signal circuit for a short to ground. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location, and perform the repair completion verification.
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9
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INSPECT BACK-UP LIGHT SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
• Inspect the signal circuit for a short to power supply. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location, and perform the repair completion verification.
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10
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INSPECT BACK-UP LIGHT SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Inspect the signal circuit for an open circuit. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
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Yes
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Replace the PCM, and perform the repair completion verification.
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No
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Repair or replace the malfunctioning location, and perform the repair completion verification.
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Repair completion verification
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VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Has the malfunction symptom been eliminated?
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Yes
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Complete the symptom troubleshooting.
Explain to the customer what has been repaired.
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No
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
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