Page 422 of 2267
INSPECTION START
(Air conditioner relay signal circuit)
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect air conditioner relay har-
ness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between air condi-
tioner relay connector terminals
p2,
p5and engine ground.
Voltage: Battery voltage
OK
ENG
Check the following:
lHarness and connec-
tors for open or short-
circuit between ignition
switch and air condi-
tioner relay.
l10A fuse
If NG, replace or repair
the parts affected.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect ECM harness connector.
3. Check harness continuity between
ECM harness connector terminal
204and air conditioner relay har-
ness connector terminal
p1.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Check the following:
lHarness connectors
E43,F2
lHarness for open or
short-circuit between
ECM and air condi-
tioner relay.
If NG, repair harness or
connectors.
CHECK AIR CONDITIONER RELAY.
Refer to HA section for inspection.
OK
ENG
Replace air conditioner
relay.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
YEC375 Air conditioner relay
harness connector
Air conditioner relay
harness connector
NEF218A
H
H
H
H
H
H
TROUBLE DIAGNOSES 15CD20T
Air Conditioner Cut Control (Cont'd)
EC-128
Page 425 of 2267
YEC814
BATTERY
Refer to EL-POWER.: Detectable line for DTC
: Non-detectable line for DTC
EGRC-
SOLENOID
VA LV E A ENGINE
CONTROL
MODULE
RELAY
ECM EGRC-
SOLENOID
VA LV E B
TROUBLE DIAGNOSES 16CD20T
EGRC-Solenoid Valve (Cont'd)
EC-131
Page 426 of 2267
DIAGNOSTIC PROCEDURE
INSPECTION START
(Circuit for EGRC-solenoid valve A)
CHECK MAIN POWER SUPPLY.
Refer to Trouble Diagnosis for main
power supply (EC-CD-59)
CHECK POWER SUPPLY.
1. Turn ignition switch to the ªLOCKº
position.
2. Disconnect EGRC-solenoid valve A
harness connector.
3. Turn ignition switch to the ªONº posi-
tion.
4. Check voltage between connector
terminal
p2and engine ground.
Voltage: Battery voltage
OK
ENG
Check the following:
lHarness continuity
between ECM relay
and EGRC-solenoid
valve A connector.
If NG, repair harness or
connectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Turn ignition switch to the ªLOCKº
position.
2. Disconnect ECM harness connector.
3. Check harness continuity between
ECM harness connector terminal
208and EGRC solenoid valve A
connector terminal
p1.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Check the following:
lHarness for open or
short-circuit between
ECM and solenoid
valve.
If NG, repair harness or
connectors.
CHECK COMPONENTS
(EGRC-solenoid valve).
Refer to ªCOMPONENT INSPECTIONº
EC-CD-135.
OK
ENG
Replace malfunctioning
component(s).
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
or the connection of ECM harness con-
nector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
EGRC solenoid valve A
harness connector
NEF219A
EGRC solenoid
valve A harness
connector
NEF220A
H
H
H
H
H
H
H
TROUBLE DIAGNOSES 16CD20T
EGRC-Solenoid Valve (Cont'd)
EC-132
Page 428 of 2267
pA
CHECK CONTROL FUNCTION.
1. Turn ignition switch to ªONº
position.
2. Turn EGRC-solenoid valve A
ªONº and ªOFFº in ªACTIVE
TESTº mode with CONSULT-II
and check operating sound.
----------------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------------
1. Check voltage between EGRC
solenoid valve A connector ter-
minal
p1, and ground with
tester under the following condi-
tions:
Voltage:
At idle
Battery voltage
Engine speed is 2,800 rpm
Approximately 0.4V
NG
EOK
CHECK VACUUM
HOSE.
Check vacuum hose
for clogging, cracks or
improper connection.
Perform electrical circuit inspection.
Refer to EC-CD-132.
OK
pB
C2ESA01
NEF435
NEF846
Crack
Clogging
Improper connection
.
NEF436
.EGRC-solenoid valve
harness connector
H
H
H
TROUBLE DIAGNOSES 16CD20T
EGRC-Solenoid Valve (Cont'd)
EC-134
Page 429 of 2267
COMPONENT INSPECTION
EGR valve
Apply vacuum to EGR vacuum port with a hand vacuum pump.
EGR valve spring should lift.
If NG, replace EGR valve.
EGRC-solenoid valve
Check air passage continuity.
ConditionAir passage
continuity
between
pAandpB
Air passage
continuity
between
pAandpC
12V direct current sup-
ply between terminals
p1andp2
Ye s N o
No supplyNo Yes
If NG, replace solenoid valve.
MEF137D EGR valve
MEC488B BATTERY FUSE
TROUBLE DIAGNOSES 16CD20T
EGRC-Solenoid Valve (Cont'd)
EC-135
Page 432 of 2267
INSPECTION START
(RDNT brake switch)
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect RDNT brake switch har-
ness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between RDNT brake
switch harness connector terminal
p1and body ground.
Voltage: Battery voltage
OK
ENG
Check the following:
lHarness connectors
F104,M50
(RHD models)
lHarness connectors
F2,E43
(LHD models)
lHarness for open or
short-circuit between
RDNT brake switch
harness connector ter-
minal
p1and ECM
connector terminal
416.
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Check harness continuity between
RDNT brake switch harness connec-
tor terminal
p2and body ground.
Continuity should exist.
If OK, check harness for short-
circuit.
OK
ENG
Repair harness or con-
nectors.
CHECK COMPONENT.
(RDNT brake switch)
Refer to ªCOMPONENT INSPECTIONº
on next page.
OK
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
YEC377
RDNT brake switch
harness connector
YEC378
RDNT brake switch
harness connector
H
H
H
H
H
H
TROUBLE DIAGNOSES 17CD20T
Brake Switch (Cont'd)
EC-138
Page 437 of 2267
DIAGNOSTIC PROCEDURE: MODELS BEFORE VIN -
P11U0548750
INSPECTION START
(MI circuit)
CHECK MI BULB.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect combination meter har-
ness connector.
3. Apply battery voltage between com-
bination meter terminal
p5andp13.
4. Check that MI lits on.
OK
ENG
Replace MI bulb.
CHECK POWER SUPPLY.
1. Turn ignition switch to ªONº position.
2. Check voltage between combination
meter terminal
p5and body
ground.
Voltage: Battery voltage
OK
ENG
Check the following:
lHarness for open or
short-circuit between
combination meter and
ignition switch.
l10A fuse
If NG, repair or replace
harness or fuse.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect ECM harness connector.
3. Check continuity between combina-
tion meter connector terminal
p13
and ECM connector terminal215.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Check the following:
lHarness connectors
M50,F104
If NG, repair harness or
connectors.
lHarness and connec-
tors for open or short-
circuit between ECM
and combination meter.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
YEC380
Combination meter
harness connector
YEC381
Combination meter
harness connector
NEF222A
Combination meter
harness connector
H
H
H
H
H
H
TROUBLE DIAGNOSES 19CD20T
MI & Data Link Connectors (Cont'd)
EC-143
Page 438 of 2267
DIAGNOSTIC PROCEDURE: MODELS AFTER VIN -
P11U0548750
INSPECTION START
(MI circuit)
CHECK MI DIODE.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect combination meter har-
ness connector.
3. Apply battery voltage between com-
bination meter terminal
p1andp8.
4. Check that MI lits on.
OK
ENG
Repair or replace combi-
nation meter.
CHECK POWER SUPPLY.
1. Turn ignition switch to ªONº position.
2. Check voltage between combination
meter terminal
p1and body
ground.
Voltage: Battery voltage
OK
ENG
Check the following:
lHarness for open or
short-circuit between
combination meter and
ignition switch.
l10A fuse
If NG, repair or replace
harness or fuse.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect ECM harness connector.
3. Check continuity between combina-
tion meter connector terminal
p8
and ECM connector terminal215.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Check the following:
lHarness connectors
M50,F104
If NG, repair harness or
connectors.
lHarness and connec-
tors for open or short-
circuit between ECM
and combination meter.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
YEC121A
YEC122A
YEC123A
H
H
H
H
H
H
TROUBLE DIAGNOSES 19CD20T
MI & Data Link Connectors (Cont'd)
EC-144
