Inspection Procedure

Check pattern select switch (PWR mode switch).
PREPARATION:

Disconnect the pattern select switch connector.

CHECK:

Check continuity between terminals 3 and 5 of pattern select switch connector when the select switch is set to PWR and NORM positions.

Fig 1: Checking Continuity Between Terminals 3 And 5
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Fig 2: Specified Condition Table
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace the pattern select switch.
2. OK: Go To Next Step
Check harness and connector between terminal PWR of ECM and body ground.
PREPARATION:
1. Connect the pattern select switch connector.
2. Disconnect the connector of ECM.
CHECK:

Check continuity between terminal PWR of ECM and body ground when the pattern select switch is set to the PWR (POWER) position and NORM (NORMAL) position.

Fig 3: Checking Continuity Between Terminal PWR of ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Fig 4: Specified Condition Table
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The ECM uses the normal pattern signal if the PWR signal is not input.
1. OK: Proceed to next circuit inspection shown on matrix chart (See PROBLEM SYMPTOMS TABLE ).
2. NG: Repair or replace harness or connector (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).