DESCRIPTION When the ignition switch is turned ON, positive (+) battery voltage is applied to the air conditioning amplifier. WIRING DIAGRAM ![]() PROCEDURE
(a) Remove the ECU-IG1 NO.3 fuse from the driver side junction block. (b) Measure the resistance according to the value(s) in the table below. Standard resistance:
![]() (a) Disconnect the J19 air conditioning amplifier connector. (b) Measure the resistance and voltage according to the value(s) in the table below. Standard resistance:
Standard voltage:
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Toyota Tundra Service Manual > Sfi System: System Voltage (P0560)
DESCRIPTION The battery supplies electricity to the ECM even when the ignition switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the battery voltage falls below a minimum level, the memory is cleared and the ECM determines that the ...