Mitsubishi Grandis. Manual — part 774
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-347
Inspection Procedure 25: A/C Compressor Relay System
1
2
3
4
1
AK305581
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
1 2 3
4 5 6
Fusible link (26)
W
W
IG2
ST
R
LOCK
ACC
IG1
5
7.5A
10
10A
L-R
L-R
L-R
L-R
G-R
Ignition switch
4
C-202
C-205
11
J/B
A/C compressor relay
Relay box
GR
B-O
B-O
4
3
1
1
2
B-16X
A/C-ECU
B-120
MU802653
A/C refrigerant
temperature
switch
A/C compressor assembly
Magnetic
clutch
7
A-16
A/C compressor relay circuit
8
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AB
C-110
(MU803802)
Engine-ECU <M/T> or
engine-A/T-ECU <A/T>
16
2
C-17
J/C (5)
C-31(*1)
J/C (6)
C-01(*2)
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
6
1(*1)
11(*2)
C-307
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-348
OPERATION
• The battery voltage is applied to the A/C
compressor relay (terminal No. 4).
• The battery voltage is applied to the A/C
compressor relay (terminal No. 3) from the
ignition switch. The engine-ECU <M/T> or
engine-A/T-ECU <A/T> (terminal No. 8) makes
the power transistor in the unit be in ON position
and makes currents go on the A/C compressor
relay coil, and that makes the relay be in ON
position.
• When the A/C compressor is in ON position, the
battery voltage is supplied to the A/C compressor
(terminal No. 1) from the A/C compressor relay
assembly (terminal No. 1).
FUNCTION
• When the A/C switch ON signal is input to the
engine-ECU <M/T> or engine-A/T-ECU <A/T>,
the engine-ECU <M/T> or engine-A/T-ECU
<A/T> places the A/C compressor relay in the ON
position. Accordingly, the battery voltage supplied
to the A/C compressor operates the magnet
clutch.
PROBABLE CAUSE
• Failed A/C compressor relay
• Failed A/C compressor magnet clutch
• Open/short circuit in A/C compressor relay circuit
or loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS PROCEDURE
NOTE:
.
*1: L.H.drive vehicle
*2: R.H.drive vehicle
STEP 1. Connector check: B-16X A/C
compressor relay connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
STEP 2. A/C compressor relay check.
• Check A/C compressor relay (Refer to GROUP
55
− On-vehicle Service
).
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace A/C compressor relay.
STEP 3. Perform voltage measurement at B-16X
A/C compressor relay connector.
• Remove relay, and measure at relay box side.
• Ignition switch: ON
• Voltage between terminal No. 3 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Go to Step 4 .
AK301005
2
1
3
4
AC
B-16X
Connector: B-16X
Harness side
connector
Relay box’s
Triangle marks
AK301005
2
1
3
4
AC
B-16X
Connector: B-16X
Harness side
connector
Relay box’s
Triangle marks
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-349
STEP 4. Connector check: C-307 ignition switch
connector
Q: Is the check result normal?
YES :
Check intermediate connectors C-17,
C-31
*1
, C-01
*2
, C-205 and C-202 and repair
if necessary. If intermediate connectors are
normal, check and repair harness between
B-16X (terminal No. 3) A/C compressor
relay connector and C-307 (terminal No. 4)
ignition switch connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace.
STEP 5. Perform voltage measurement at B-16X
A/C compressor relay connector.
• Remove relay, and measure at relay box side.
• Voltage between terminal No. 4 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Check intermediate connector A-16, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-16X (terminal No. 4)
A/C compressor relay connector and
battery.
• Check power supply line for
open/short circuit.
STEP 6. Connector check: B-120 A/C compressor
assembly connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair or replace.
1
2
3
4
5
6
AK305629
C-307
C-307
Connector: C-307
Harness side connector
<R.H.drive vehicle>
<L.H.drive vehicle>
AB
AK301005
2
1
3
4
AC
B-16X
Connector: B-16X
Harness side
connector
Relay box’s
Triangle marks
AK301005
2
1
3
4
AC
B-16X
Connector: B-16X
Harness side
connector
Relay box’s
Triangle marks
1
AK305637AB
B-120 (B)
Connector: B-120
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-350
STEP 7. Perform voltage measurement at B-120
A/C compressor assembly connector.
• Disconnect connector, and measure at harness
side.
• Remove B-16X (terminal No. 1 and No. 4) A/C
compressor relay and short-circuit of harness
side connector.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Check and repair harness between B-120
(terminal No. 1) A/C compressor assembly
connector and B-16X (terminal No. 1) A/C
compressor relay connector.
• Check output line for open/short
circuit.
STEP 8. Perform voltage measurement at C-110
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 8 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Go to Step 9 .
1
AK305637AB
B-120 (B)
Connector: B-120
Harness side connector
AK301005
2
1
3
4
AC
B-16X
Connector: B-16X
Harness side
connector
Relay box’s
Triangle marks
AK305618AB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
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