COMBUSTION TYPE POWER HEATER SYSTEM > Power Heater Alternator Circuit

for Preparation Click here


DESCRIPTION

The power heater ECU receives engine operation signals from the L terminal of the generator. If this circuit is open, the power heater ECU will determine that engine operation signals indicate ON. If this circuit is shorted, the power heater ECU will determine that engine operation signals indicate OFF and the power heater will not operate.

WIRING DIAGRAM


E176778E01


INSPECTION PROCEDURE

1.INSPECT GENERATOR

  1. Inspect the generator.
    Item
    		See page
    On-Vehicle Inspection
    		 Click here
    Inspection
    		 Click here



NG
REPLACE GENERATOR (Click here)
OK


2.CHECK HARNESS AND CONNECTOR (POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY) - GENERATOR)


    E176779E01

  1. Disconnect the A45 power heater ECU (combustion heater assembly) connector.

  1. Disconnect the B45 generator connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A45-8 (+) - B45-4 (L)
    		Always
    		Below 1 Ω
    A45-8 (+) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the generator connector.

  1. Reconnect the power heater ECU (combustion heater assembly) connector.

Text in Illustration 
*1
Front view of wire harness connector
(to Power Heater ECU (Combustion Heater Assembly))
*2
Front view of wire harness connector
(to Generator)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY) - BATTERY)


    E176184E02

  1. Disconnect the A45 power heater ECU (combustion heater assembly) connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A45-8 (+) - Body ground
    		Engine idling
    (Generator: Operating)
    		11 to 14 V

Text in Illustration 
*1
Front view of wire harness connector
(to Power Heater ECU (Combustion Heater Assembly))


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)