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DI-632
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3WF-08
Compressor Circuit
CIRCUIT DESCRIPTION
The A/C control assembly outputs the magnetic clutch ON signal from terminal AC1 to the ECM. When the
ECM receives this signal, it sends a signal from terminal ACT and switches the A/C magnetic clutch relay
ON, thus turning on the A/C magnetic clutch.
WIRING DIAGRAM
A32
Magnetic Clutch A/C Amplifier
Relay
4 3 2
B-Y 1 4 G-B
IJ1 IJ1 A30 MGC
L-W B-W
3D 2 9
B-Y
Center J/B
25 2
3D 9 II4 IJ1
W-G W-G
B-Y
1
5 1F A2
Magnetic ECM
9 13
Clutch L-Y
AC1 E14 A30 AC1
GAUGE Driver Side J/B
3 10
2 1I L-B
I14 ACT E14 A30 ACT
Ignition Switch
B-Y 4 2
IG1 AM1
Engine Room R/B W
W ALT AM1
2 2
1 2 1 2
Battery
I21905
2002 4RUNNER (RM887U)
Author : Date : 808
DI-633
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminal MGC of A/C control assembly connector and
body ground.
PREPARATION:
(-) (a) Remove A/C control assembly with connectors still con-
MGCR(+)
nected (See page AC-84 ).
(b) Start the engine and push AUTO switch.
CHECK:
Check voltage between terminal MGC of A/C control assembly
connector and body ground when magnetic clutch is ON and
OFF by A/C switch.
I00344 OK:
A/C switch Voltage
ON Below 1 V
OFF 10 - 14 V
NG Go to step 5.
OK
2 Check magnetic clutch relay.
PREPARATION:
Remove magnetic clutch relay from cooling unit (See page
4 1 AC-28 ).
4 1 CHECK:
Check continuity between each pair of terminals shown below
9
of magnetic clutch relay.
7 OK:
9 7 Tester connection Specified condition
I09222
1-4 62.5 - 90.9
7-9 Continuity
PREPARATION:
Apply battery positive (+) voltage between terminals 1 and 4.
CHECK:
Check continuity between terminals 1 and 9.
OK:
Continuity exists.
NG Replace magnetic clutch relay.
OK
2002 4RUNNER (RM887U)
Author : Date : 809
DI-634
DIAGNOSTICS - AIR CONDITIONING SYSTEM
3 Check A/C magnetic clutch.
PREPARATION:
Disconnect magnetic clutch connector.
CHECK:
Connect positive (+) lead connected to battery to magnetic
clutch connector and negative (-) lead connected to battery to
body ground.
OK:
Magnetic clutch is energized.
N13080
NG Repair A/C magnetic clutch.
OK
4 Check harness and connector between magnetic clutch relay and A/C compres-
sor, A/C compressor and body ground (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI-586 ).
2002 4RUNNER (RM887U)
Author : Date : 810
DI-635
DIAGNOSTICS - AIR CONDITIONING SYSTEM
5 Check voltage between terminal AC1 of A/C control assembly connector side
and body ground.
PREPARATION:
(a) Disconnect A/C control connector.
(b) Ignition switch to ON.
CHECK:
Check voltage between terminal AC1 of A/C control assembly
harness side connector.
OK:
(-) AC1(+) Voltage : 10 - 14 V
I00340
NG Check and replace ECM.
OK
6 Check voltage between terminal AC1 of A/C control assembly connector and
body ground.
PREPARATION:
(-) (a) Remove A/C control assembly with connector still con-
nected (See page AC-84 ).
AC1(+) (b) Start the engine and push AUTO switch.
CHECK:
Check the voltage between terminal AC1 of A/C control assem-
bly connector and body ground when magnetic clutch is ON
and OFF by A/C switch.
I00341 OK:
Magnetic clutch Voltage
ON Below 1 V
OFF 10 - 14 V
NG Check and replace A/C control assembly.
OK
2002 4RUNNER (RM887U)
Author : Date : 811
DI-636
DIAGNOSTICS - AIR CONDITIONING SYSTEM
7 Check voltage between terminal ACT of A/C control assembly and body ground.
PREPARATION:
(-) (a) Remove A/C control assembly with connectors still con-
nected (See page AC-84 ).
ACT(+) (b) Start the engine and push AUTO switch.
CHECK:
Check the voltage between terminal ACT of A/C control assem-
bly and body ground.
OK:
I00342 A/C switch Voltage
ON 10 - 14 V
OFF Below 1.5 V
NG Check and replace ECM.
OK
8 Check voltage between terminal ACT of ECM connector and body ground (See
page DI-18 ).
NG Check and replace ECM.
OK
9 Check harness and connector between A/C control assembly and ECM (See
page IN-28 ).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI-586 ).
2002 4RUNNER (RM887U)
Author : Date : 812
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