Inspection Procedure

NOTE:

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

CHECK OPERATION OF SPEEDOMETER
1. Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.
  NOTE:
  The vehicle speed sensor is operating normally if the speedometer display is normal.
1. NG: CHECK SPEEDOMETER CIRCUIT (See MALFUNCTION IN SPEEDOMETER )
2. OK: Go to next step.

INSPECT ECM (SPD VOLTAGE)

Shift the lever to the neutral position.
Jack up the vehicle.
Turn the ignition switch ON.

Check the voltage between the terminals of the E4 and E5 ECM connectors as the wheel is turned slowly.

Standard:

CONNECTOR SPECIFIED CONDITION

Tester Connection	Specified Condition
SPD (E5-17) - E1 (E4-7)	Voltage is generated intermittently

Fig 1: Checking Voltage Between Terminal Of E4 And E5 ECM Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE:

The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly.

Fig 2: Output Voltage Fluctuation Graph

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE ECM (See REPLACEMENT )