P0500

CRUISE CONTROL: CRUISE CONTROL SYSTEM: P0500: Vehicle Speed Sensor Malfunction

DTC P0500 - Vehicle Speed Sensor Malfunction

DESCRIPTION

The hybrid vehicle control ECU receives a vehicle speed signal from a combination meter to control the cruise control system.
A voltage of 12 V or 5 V is output from the combination meter assembly and then input to the skid control ECU.
A voltage of 12 V or 5 V is output from each ECU or relay and then input to the combination meter assembly.
The signal is changed to a pulse signal at the transistor in the combination meter assembly.
Each ECU controls the respective system based on the pulse signal.
If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below will not operate normally.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)





(a) Remove the combination meter.
(b) Connect the oscilloscope to terminal E1-9 (+S) and body ground.
(c) Turn the power switch on (IG).
(d) Turn the wheel slowly.
(e) Check the signal waveform according to the condition(s) in the table below.






OK:
The waveform is displayed as shown in the illustration.
HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

NG -- GO TO SPEED SIGNAL CIRCUIT
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HYBRID VEHICLE CONTROL ECU)





(a) Disconnect the E1 connector from the combination meter.
(b) Disconnect the D35 connector from the hybrid vehicle control ECU.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):





(d) Reconnect the E1 connector to the combination meter.
(e) Reconnect the D35 connector to the hybrid vehicle control ECU.
NG -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - JUNCTION CONNECTOR)
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
3. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - JUNCTION CONNECTOR)





(a) Disconnect the D35 connector from the hybrid vehicle control ECU.
(b) Disconnect the D53 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(d) Reconnect the D53 connector to the hybrid vehicle control ECU.
(e) Reconnect the D53 junction connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - JUNCTION CONNECTOR)
OK -- REPLACE JUNCTION CONNECTOR (NO. 4 JUNCTION CONNECTOR)