Toyota Tundra. Manual — part 2409
clutch.
WIRING DIAGRAM
Fig. 72: Air Conditioning Compressor Magnetic Clutch - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1. READ VALUE USING TECHSTREAM (A/C SIGNAL)
a. Use the Data List to check if the air conditioning signal is functioning properly.
ECM
DATA LIST
Tester
Display
Measurement Item/Range
Normal Condition
Diagnostic
Note
A/C Signal
Air conditioning switch signal/ON or
OFF
ON: Air conditioning ON
OFF: Air conditioning
OFF
-
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
OK:
The display is as specified in the normal condition.
NG: Go to step 2
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE (See PROBLEM SYMPTOMS TABLE )
2. INSPECT FUSE (A/C IG)
a. Remove the A/C IG fuse from the main body ECU.
b. Measure the resistance according to the value(s) in the table below.
Standard Resistance
TESTER CONNECTION SPECIFIED CONDITION CHART
NG: REPLACE FUSE
OK: Go to Next Step
3. INSPECT MAGNETIC CLUTCH RELAY (MG CLT)
a. Remove the magnetic clutch relay from the engine room relay block.
Fig. 73: Inspecting Magnetic Clutch Relay (MG CLT)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the resistance according to the value(s) in the table below.
Standard Resistance
TESTER CONNECTION SPECIFIED CONDITION CHART
Tester Connection Condition Specified Condition
A/C IG fuse
Always
Below 1 ohms
Tester Connection
Condition
Specified Condition
3 - 5
When battery voltage is not applied between terminals 10 kohms or higher
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
NG: REPLACE MAGNETIC CLUTCH RELAY
OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)
a. Disconnect the J19 air conditioning amplifier connector.
Fig. 74: Identifying Terminals Of J19 Air Conditioning Amplifier Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the voltage according to the value(s) in the table below.
Standard Voltage
TESTER CONNECTION SPECIFIED CONDITION CHART
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to Next Step
5. CHECK AIR CONDITIONING AMPLIFIER (MGC VOLTAGE)
a. Reconnect the J19 air conditioning amplifier connector.
When battery voltage is applied to terminals 1 and 2
Below 1 ohms
Tester Connection
Switch Condition Specified Condition
J19-20 (MGC) - Body ground
Ignition switch OFF
Below 1 V
Ignition switch ON
11 to 14 V
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
Fig. 75: Identifying Terminals Of J19 Air Conditioning Amplifier Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the voltage according to the value(s) in the table below.
Standard Voltage
TESTER CONNECTION SPECIFIED CONDITION CHART
NG: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )
OK: Go to Next Step
6. INSPECT AIR CONDITIONING COMPRESSOR (COMPRESSOR HARNESS)
a. Disconnect the D60 air conditioning compressor connector.
Tester Connection
Switch Condition
Specified
Condition
J19-20 (MGC) - Body
ground
Engine running and air conditioning switch ON
Below 1 V
Engine running and air conditioning switch
OFF
11 to 14 V
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
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