P0504: Brake Switch Correlation; Dtc: P0504 - Hino Motors HINO 155 series Workshop Manual

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DTC: P0504

P0504: Brake Switch Correlation

INFORMATION
Engine ECU
1. Technical description
• The brake switch detects brake input during deceleration.
<Description of malfunction>
• Malfunction of the brake switch caused by disconnection has been detected.
2. DTC set condition
(1) DTC detection condition
• Starter key "ON".
• Battery voltage is in the range of 10 V to 16 V.
• Absence of input of the brake switch is detected during deceleration.
(2) Judgement criteria
• Absence of input of the brake switch remains for 3 seconds or longer during deceleration.
3. Reset condition
• Immediately after normal operation is restored.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: OFF
• SVS light: OFF
• Cruise control function is not available.
5. Symptoms on the vehicle when the DTC is set
<Symptoms on the vehicle due to backup control (fail safe function)>
• Cruise control does not work.
<Symptoms on the vehicle due to malfunction>
• –
6. Pre-inspection work
• Check that the battery voltage is in the normal range.
7. After-inspection work
• Clear all past DTCs.
• Check that no DTC is stored after test drive.
8. Estimated failure factors
• Brake switch failure (stuck switch)
• Irregular contact (disconnection or poor fit of connector)
• Harness disconnection or short-circuit
• CAN signal: Noise
ENGINE (J05E)/TROUBLESHOOTING
12.7mA
J4K
(ST1-)
Stop light switch signal
Brake switch
EKE
(NC-)
EN01H02127030602016088
SHTS021270300521