Toyota 4Runner manuals

Toyota 4Runner: Generator Signal Circuit

DESCRIPTION

When the engine is started, the generator assembly turns on and a voltage pulse signal is generated.

This signal is used by the air conditioning amplifier assembly.

The signal expressing the amount of output from the generator assembly is one element of PTC heater control.

WIRING DIAGRAM


PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - GENERATOR)

(a) Disconnect the F42 amplifier connector.

(b) Disconnect the C5 generator connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

F42-25 (ALT) - C5-3 (M)

Always

Below 1 Ω

F42-25 (ALT) - Body ground

Always

10 kΩ or higher


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

PTC Heater Circuit
DESCRIPTION PTC heater relays are closed in accordance with signals from the air conditioning amplifier assembly and power is supplied to the quick heater assembly installed on the radiator heate ...

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