WHEEL SENSOR (RIGHT, FRONTWARD) SIGNAL BLACKOUT [DTC CODE: P020A, MALFUNCTION CODE: 3-1 (3)]

Expand All

ABS light indication	3-1
Malfunction code	3-1 (3)
Description of malfunction	No wheel sensor signal Excessive air gap of wheel sensor (right, frontward) Extremely low wheel sensor signal voltage compared to standard voltage
Vehicle status	Not actuated right front wheel ABS
Possible cause	Improper adjustment of air gap Disconnection of harness, partially failed connection of connector Untucked wheel sensor Abnormality in clamping bushing
ECU terminals subject to inspect	The 2nd and 3rd terminals of 18 pin connector

1. Measuring output voltage between terminals

Detail

Set the starter key to the "LOCK" position and disconnect the ABS ECU 18 pin connector.
Connect a tester to the 2nd and 3rd terminals of the 18 pin connector (vehicle harness side). Measure voltage between these two terminals when a tire makes one revolution in 5 seconds.

Standard value: 150-1,999 mV (AC voltage range)

NO

Proceed to [2] Measuring resistance between terminals. YES

Normal now. Short-lived disconnection or short-circuit is likely to have occurred in the harness between the ABS ECU and the wheel sensor (right, frontward).
Inspect the harness and connectors.

2. Measuring resistance between terminals

Detail

Measure resistance between the 2nd and 3rd terminals of the 18 pin connector (vehicle harness side).

Standard value: 1.0-1.3 kΩ

NO

Proceed to [3] Measuring resistance between sensor terminals. YES

Normal now. Short-lived disconnection or short-circuit is likely to have occurred in the harness between the ABS ECU and the wheel sensor (right, frontward).
Inspect the harness and connectors.

3. Measuring resistance between sensor terminals

Detail

Disconnect the wheel sensor (right, frontward) connector and measure resistance between terminals of the sensor connector.

Standard value: 1.0-1.3 kΩ

NO

Internal disconnection or short-circuit in the wheel sensor (right, frontward)
Replace the wheel sensor. YES

Normal now. Short-lived disconnection or short-circuit is likely to have occurred in the harness between the ABS ECU and the wheel sensor (right, frontward).
Inspect the harness and connectors.

DTC Clear

Detail

Confirm the DTC P020A is inactive

Start the engine and let it idling condition.
Verify the DTC P020A is inactive.

DTC Clear

Clear the DTC with Hino DX
Confirm the same DTC is not reoccurred

P020A is reoccur: Return to first process
Other DTC appear: Refer to concerned Trouble shooting

Complete