replace indicator relay HONDA CIVIC 2003 7.G Workshop Manual

Gharging System
Charging Circuit Troubleshooting (cont'd)
6. Start the engine. Hold the engine at 3,000 rpm with
no load (in Neutral) until the radiator fan comes on,
then let it idle.
7. Raise the engine speed to 2,000 rpm, and hold it
there.
8. Turn the headlights (high beam) on, and measure
voltage at the under-hood fuse/relay box terminal.
ls the voltage between 13.9 and 15.1 v?
YES-Go to step 9.
NO Repair or replace the alternator components
(see page 4-30).1
9. Read the amperage at '13.5 V.
NOTE: Adjust the voltage by turning the blower
motor, rear window defogger, brake lights. etc. ON.
ls the amperage 604 ot morc?
YES-Alternator/regulator operation is OK. I
NO Repair or replace the alternator components(see page 4-30).1
4-24
\,
Alternator Control System Test
NOTE: After troubleshooting, perform the engine
control module (ECM) idle learn procedure (see page
11-139).
1 . Check for proper operation of the electrical load
detector (ELD) by checking the malfunction
indicator lamp (MlL) (see page 1 l-3). lf a DTC is
present, diagnose and repair the cause before
continuing with this test.
2. Disconnect the engine wire harness 6P connector
from the starter sub harness 6P connector.
3. Start the engine, and turn the headlights (high
beam) ON,
4. Measure voltage between the engine wire harness
6P connector terminal No. 2 and the positive
terminal of lhe battery.
C {WHT/GRN)
ENGINE WIRE HARNESS 6P CONNECTOR
Wire side of female terminals
ls there 1 V or less?
YES Go to step 8.
NO-Go to step 5.
Turn the headlights and ignition switch OFF.
Disconnect ECM connector B (24P).
5.
6.
BATTERY

CavityWireTest conditionTest: Desired resultPossible cause il result is not obtained
6GRYiREDSet button pushedCheck for voltage to ground:
There should be battery
voltage,
When testing terminal No.6,
there should be no voltage on
terminal No. 7.
Blown No.7 (15 A)fuse in the
under-hood fuse/relay box
Faulty horn relay
Faulty sevresume/cancel
swrtch
Faulty cable reel
An open in the wire
Shon to ground (horn sounds
when button is pressed)
7LT GRN/
BLK
Resume button
pusneo
Check for voltage to ground:
There should be battery
voltage.
When testing terminal No.7,
there should be no voltage on
terminal No. 6.
BRNConnect battery
power to the BRN
terminal and ground
to the BRNIVEL
termrnal
Check the operation of the
actuator motor: You should
be able to hear the motor.
. Faulty actuator. An open in the wire11BRNI/EL
10B LUIVE Llgnition switch ON
0r)
Attach to groundi
Cruise indicator light in the
gauge assembly should come
on.
Blown No. 10 (7.5 A) fuse in
the under-dash fuse/relay box
Blown cruise indicator bulfl
Faulty gauge assembly
An open in the wire
12BLU/VVHTlgnition switch ON
(ll) and main switch
ON; raise the front of
the vehicle, and
rotate one wheel
slowly while holding
the other wheel
Check for voltage between
thE BLU/VVHT (+) ANd BLK
( )terminals:
Thereshouldbe0 5Vor
more repeatedly.
Faulty VSS
An open in the wire
Short to ground
13LT GRNlgnition switch oN
{ll) and main switch
ON
Check for voltage to ground:
There should be battery
voltage.
Blown No. 4 (10 A)fuse in the
under-dash fuse/relay box
Faulty main switch
An oDen in the wire
14LT BLUClutch pedal
reteaseo
Check for continuity to
grouno:
There should be continuity.
NOTE:There should be no
continuity when the clutch
oedal is Dressed.
Faulty clutch pedal position
swtlcn
Poor ground (G501)
Incorrect clutch switch
adjustment
An open in the wire
lf any test indicates a problem, find and correct the cause, then recheck the system. lf all the input tests prove OK,
the cruise control unit may be faulty. Substitute a known-good cruise control unit and retest. lf the system works
properly, replace the cruise control unit.
4-41

MIL Circuit Troubleshooting
1. Connect an OBD ll scan tool/Honda PGM Tester
(see page 11-3).
2. Turn the ignition switch ON (ll) and read the OBD ll
scan tool/Honda PGM Tester.
Does the OBD ll scan tool/Honda PGM Tester
communicate with the ECM?
YES Go to step 3.
NO Go to troubleshooting " DLC Circuit
Troubleshooting" (see page 11-109).
3. Check the OBD ll scan tool/Honda PGM Testerfor
DTCs.
Are any DTCs ind icated?
YES Go to the DTC Troubleshooting Index.
NO-Go to step 4.
4. Turn the ignition switch OFF.
5. Turn the ignition switch ON (ll)and watch the
lMalfunction Indicator Lamp (MlL).
Does the MIL come on and stay on for more than
20 seconds aftet turning the ignition switch
oN (tr)?
YES lf the MIL always comes on and stays on, go
to step 76. But if the lMlL sometimes works
normally, first check for these problems.
. An intermittent short in the wire between the
ECIM (E29) and the data link connector (DLC).
. An intermittent short in the wire between the
ECM (E31) and the gauge assembly.
NO lf the MIL is always off, go to step 6. But if the
lvllL sometimes works normally, first check for
these problems.
. A loose No. 10 METER (7.5A) fuse in the under
dash fuse/relay box.. A loose No. 20 lG (40A) (Canada: 50A)Iuse in the
under-hood fuse/relay box.. A ioose No. 6 ECU (ECM) (15A) fuse in the under-
hood fuse/relay box.
. A loose No. 17 FUEL PUMP (15A)fuse in the
under-dash fuse/relay box.. A poor connection at ECM terminal E31.. An intermittent open in the GRN/ORN wire
between the ECM (E31) and the gauge assembly.. An intermittent short in the wire between the
ECM (A21) and the manifold absolute pressure
(MAP) sensor.. An intermittent short in the wire between the
ECI\4 (A20) and the throttle posilion (TPi sensor.. An intermittent short in the wire between the
ECM (E5) and the fuel tank pressure (FTP) sensor.
6. Turn the ignition switch OFF.
7. Turn the ignition switch ON (ll).
ls the low oil pressure light on?
YES Go to step 10.
NO-Go to step 8.
8. Inspectthe No. 10 l\4ETER (7.5A)fuse inthe under-
dash fuse/relay box.
ls the luse OK?
YES Go to step L
NO Repair shon in the wire between No. 10
METER (7.5A)fuse and the gauge assembly. Also
replacethe No. 10 METER {7.5A) fuse.l
9. Inspect the No. 20 lG1 (40A) (Canada: 50A) fuse in
the under-hood fuse/relay box.
ls the f use OK?
YES Repair open in the wire between the No. 20
lG (40A) {Canadar 50A)fuse and the gauge
assembly. lf the wire is OK, test the ignition switch
{see page 22 53).
NO Repair short in the wire between No. 20 lG
(40A) lCanada: 50A)fuse and the under'dash fusel
relay box. Also replace the No.20 lG (40Ai
(Canada: 50A) fuse.I
(conr'd)
11-97

EPS Components
11.
12.
DTC Troubleshooting (cont'dl
Substitute a known-good EPS control unit, and
connect all the disconnected connectors.
Sta rt the engine, and turn the steering wheel from
lock to lock several times.
Does the EPS indicator come on?
YES Go to step 13.
NO -Check for loose or poor connections at the
EPS control unit and the motor connections. lf the
connections are good, replace the EPS control unit
and recheck.l
Stop the engine, and verity the DTC.
ls DTC 43 indicated?
YES-Replace the steering gearbox motor and
recheck. tl
NO-Perform the appropriate troubleshooting for
the code indicated.l
13.
17-42
DTC 47: EPS Control Unit lnternal Circuit(Power Relay)
1. Clear the DTC.
2. Start the engine.
Does the EPS indicator come on?
YES-Go to step 3,
NO-Check for loose wires or poor connections, lf
the connections are good, the system is OK at this
time.I
3. Stop the engine, and verify the DTC.
ls DTC 47 indicated?
YES Check for loose EPS control unit connectors.
lf necessary, substitute a known-good EPS control
unit and recheck.l
NO Perform the appropriate troubleshooting for
the code indicated.I
(

EPS Components
DTC Troubleshootang (cont'dl
DTC 62: EPS Control Unit Internal Circuit
(Fail-safe Relay Stuck ON)
'1. Clear the DTC.
2. Start the engine.
Does the EPS indicator come on?
YES-Go to step 3.
NO-Check for loose wires or poor connections. lf
the connections are good, the system is OK at this
time.I
3. Stop the engine, and verify the DTC.
ls DTC 62 indicated?
YES-Check for loose or poor connections at the
EPS control unit. lf the connections are good,
substitute a known-good EPS control unit. lf the
symptom/indication goes away, replace the
original EPS control unit and recheck.l
NO-Perform the appropriate troubleshooting for
the code indicated. t
17-44
DTC 64: Battery Voltage is Excessively Low
(Fail-safe Relay Contact Failure and Motor
Voltage FallOff)
1. Clear the DTC.
2. Start the engine.
Does the EPS indicatot come on?
YES Go to step 3.
NO Check for loose wires or poor connections. lf
the connections are good, the system is OK at this
trme.l
3. Stop the engine, and verify the DTC.
ls DTC 64 indicated?
YES Go to step 4.
NO Perform the appropriate troubleshooting for
the code indicated.
4. Check the No. '18 (604) fuse in the under-hood fuse/
relay box, and reinstallthe fuse if it is OK.
Is the f use OK?
YES Go to step 5.
NO Replace the fuse and recheck.l
5. Disconnect EPS control unit connector A (2P).
6. Measure the voltage between EPS control unit
connector A (2P) terminal No. 1 and body ground.
-Blwt{r/Bl.ur Hl
\9
I
ls there battety voltage?
YES - Check for loose or poor connections at the
EPS control unit connectors, and check for a poor
ground at G 15 1. lf necessary, substitute a known-
good EPS control unit and recheck.l
NO Repair open in the WHT/BLU wire between
the No. 18 (60,4)fuse and EPS control unit.l
(

EPS Indicator Circuit Troubleshooting
1.Turn the ignition switch ON (ll), start the engine,
and watch the EPS indicator.
Does the EPS indicator come on?
YES lf the EPS indicator comes on and goes off, it's
OK. lf the EPS indicator stays on or blinks. go to
step 12.
NO Go to step 2.
Turn the ignition switch OFF, then ON (ll) again,
and watch the brake system indicator,
Does the brake system indicator come on?
YES-Go to step 3.
NO Repair open in the indicator power source
circuit.l. Blown No. 10 (7.5A)fuse.
. Open in the wire between the No. 10 (7.5A) fuse
and gauge assembly.. Open circuit inside the under-dash fuse/relay box,. Faulty gauge assembly.
Turn the ignition switch OFF,
Connect a jumper wire between the gauge
assembly 22P connector terminal No. 13 and body
ground, then turn the ignition switch ON (ll).
GAUGE ASSEMBLY 22P CONNECTOR (Blue connector)
Wire side of female terminals
Does the EPS indicator come on?
YES-Go to step 5.
NO Inspect the EPS indicator bulb, if the bulb is
OK, replace the bulb circuit board in the gauge
assembly.l
3.
4.
5. Turn the ignition switch OFF.
6. Disconnect EPS control u n it connector C (20P).
7. Turn the ignition switch ON (ll).
8. Connect EPS control unit connector C (20P)
terminal No. 6 to body ground with a jumper wire.
Wire s d€ oflemale16rmina s
Does the EPS indicatot come on?
YES Go to step 9.
NO Repair open in the wire between the gauge
assembly and the EPS control unit.l
Turn the ignition switch OFF.
Disconnect EPS control unit connector A (2P),
Check for continuity between EPS control unit
connector A terminal No. 2 and body ground.
EPS CONTROL UNITCONNECTOA A I2PI
wire s de oftemale terminals
ls there continuity?
YES Check for loose or poor connections at the
EPS control unit. lf the connections are good,
substitute a known-good EPS control unit. lf the
symptom/indication goes away, replace the
original EPS control unit and recheck.I
NO Repair open in the wire or a bad ground at
G151,t(cont'd)
9.
10.
'l 1.
EPS CONTBOL UNIT CONNECTOB C {2OP)
17-47

EPS Components
I
12.
EPS Indicator Circuit Troubleshooting (cont'dl
Turn the ignition switch OFF.
Disconnect EPS control unit connector C (20P).
Turn the ignition switch ON (ll).
Does the EPS indicator come on?
YES-Repair short to ground in the YEUBLU wire
between the gauge assembly and the EPS control
unit, or replace the bulb circuit board in the gauge
assembly.l
NO-Go to step 15.
Measure the voltage between EPS control unit
connector C (20P)terminal No. 10 and body ground.
EPS CONTROL UNIT CONNECTOR C I2OP)
Wire side of female terminals
ls there battery voltage?
YES-Go to step 16.
NO-Repair open in the wire between EPS control
unit connector C (20P) and the No, 10 (7.5A) fuse. t
13.
14.
17-48
16. Measure the voltage between EPS control unit
connector A (2P)terminal No. '1 and body ground.
EPS CONTROL UNITCONNECTON A (2P}
+B (WHT/BLUI H
Itr
v-L
17.
18,
19.
20.
Wire side of female terminals
ls there battery voltage?
YES-Go to step 17.
NO-Check for a blown No. 18 (604) fuse in the
under-hood fuse/relay box or open/short in the
WHT/BLU wire between the under-hood fuse/relay
box and the EPS control unit.l
Turn the ignition switch OFF.
Reconnect EPS control unit connector A (2P).
Turn the ignition switch ON (ll).
Measure the voltage between EPS control unit
connector C (20P)terminal No. 8 and body ground.
EPS CONTROL UNIT CONNECTOR C (2OP)
Wire side of female terminals
ls therc about 10 V?
YES Check for loose or poor connections at the
EPS control unit. lf the connections are good,
substitute a known-good EPS control unit. lf the
symptom/indication goes away, replace the
original EPS control unit and recheck.l
NO Repair short to ground in the BRN wire
between the data link connector and the EPS
control unit.I

4. Check for continuity between the ABS control unit
31 P connector terminal No. 16 and body grou nd.
ABS CONTROL UNIT 31P CONNECTOR
Wire side of female terminals
ls there continuity?
YES-Go to step 5.
NO Repair open in the wire between the ABS
control unit and body ground (G202).1
Reconnect the ABS control unit 31P connector.
Clear the DTC, then disconnect the Honda PGM
tester.
Test-drive the vehicle at 6 mph (10 km/h) or more.
Doesthe ABS indicator come on, and is DTC 51
indicated?
YES Replace the ABS modulator-control unit.l
NO The system is OK at this time.l
6.
7.
DTG 52: Motor Stuck OFF
1. Check the No. 10(40A) fuse in the under-hood
fuse/relay box.
ls the f use OK?
YES-Reinstall the fuse, and go to step 2.
NO-Replace the fuse, and recheck.l|
Disconnect the ABS control unit 31P connector.
Measure the voltage between the ABS control unit
31P connector terminal No. 17 and body ground
ABS CONTROL UNIT 31P CONNECTOR
2.
3.
ls there battery voltage?
YES-Go to step 4.
NO Repair open in the wire between the
(40A) fuse and the ABS control unit.l
No. 10
(cont'di
Wire side of female terminals
19-49

DTC 54: Main Relay Stuck OFF
1. Checkthe No.8 (20A) fuse in the under-hood fuse/
relay box, and reinstallthe fuse if it is OK.
ls the f use OK?
YES-Go to step 2.
NO Replace the fuse, and recheck.l
2. Disconnect the ABS control unit 31P connector.
3. l\4easure the voltage between the ABS control unit
connector terminal No. 18 and body ground.
ABS CONTROL UNIT 31P CONNECIOR
Wire side of female terminals
Is there battety voltage?
YES Replace the ABS modulator-control unit.l
NO-Repair open in the wire between the ABS
control unit and the under-hood fuse/relay box.I
DTC 61: lG2 Voltage
NOTE: Check the No. 11 (7.5A) fuse in the under-dash
fuse/relay box before troubleshooting.
1. Clear the DTC, then disconnect the Honda PGM
tesler.
2. Test drive the vehicle.
Doesthe ABS indicator come on and is DTC 61
ind icated ?
YES Go to step 3.
NO The system is OK at this time.l
3. Disconnect the ABS control unit3lPconnector.
4. Turn the ignition switch ON (ll).
5. Measure the voltage between the ABS control unit
31P connectorterminal No. 15 and body ground.
ABS CONTROL UNIT 31P CONNECTOR
ls there battery voltage?
YES Replace the ABS modulator-control unit.l
NO - Repair open in the wire between the ABS
control unit and the under-hood {use/relay box.l
Wire side of female terminals
19-51

8.
9.
Disconnect the gauge assembly connector A (22P).
Check for continuity between gauge assembly
connector A {22P) terminal No, 12 and body ground.
GAUGE ASSEMBLY CONNECTOR A (22P)
Wire side of female terminals
ls there continuity?
YES- Repair shon to body ground in the wire
between the gauge assembly and the ABS control
unit.l
NO Go to step 10.
Disconnect the gauge assembly connector B (22P).
Check for continuity between gauge assembly
connector B (22P) terminal No. 12 and body ground.
GAUGE ASSEMBLY CONNECTOR B (22PI
Wire side ol Iemale terminals
ls there continuity?
YES Check for loose terminals in the gauge
assembly connectors. lf the connectors are OK,
replace the gauge assembly.l
NO Repair open in the wire between the gauge
assembly and body ground (G501).1
'10.
11.
3.
ABS indicator does not go off
1. Checkthe No. 8 (20Alfuse in the under-hood fuse/
relay box, and reinstall the fuse if it is OK.
ls the fuse OK?
YES Go to step 2.
NO-Replace the fuse, and recheck. lf the fuse is
blown, check for a shon to body ground in this fuse
circuit. ll the circuit is OK, replace the ABS
modulator-control unit. I
Check the No. 11 (7.5A) fuse in the under-dash
fuse/relay box, and reinstall the fuse if it is OK.
ls the f use OK?
YES Go to step 3.
NO Replace the fuse, and recheck. If the fuse is
blown, check for a short to body ground in this fuse
circuit. lf the circuit is OK, replace the ABS
modulator-control unit. I
Disconnect the ABS control unit 31P connector.
Measure the voltage between terminal No. l8 and
body ground.
A8S CONTROL UNIT3lP CONNECTOR
ls there battery voltage?
YES-Go to step 5.
NO Repair open in the wire between the No. 8
(20A) fuse and the ABS control unit.l
(cont'd)
Wire side of female terminals
19-53