INSPECTION PROCEDURE 1. INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY
(b) Check that the switch illuminates. OK:
If the result is not as specified, replace the back sonar or clearance sonar switch assembly. Text in Illustration
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Toyota Tundra Service Manual > Sfi System: Actuator Supply Voltage Circuit / Open (P0657)
DESCRIPTION The ECM monitors the output voltage to the throttle actuator. This self-check ensures that the ECM is functioning properly. The output voltage usually is 0 V when the ignition switch is turned off. If the output voltage is higher than 7 V when the ignition switch is turned off, the ECM w ...