Ground HONDA CIVIC 2000 6.G Workshop Manual

Troubleshooting
Symptom Chart
NOTE:
. Any abnormality must be corrected before continuing the test.. Because of the precise measurements needed. use a multimeter when testinq.. Before performing any troubleshooting procedures check:- Fuses No. 47 l7 -5 Al, No. 56 (20 A) in the under-hood fuse/relay box, and No. 17 (7.5 A) in the under_dash fuse/relavbox- Grounds No. c401, c402, G751- Cleanliness and tightness of alt connectors
SymptomRemedy
Condenser fan does not run at all.Perform the procedures in the flowchart {see page 22-9).
Compressor clutch does not engage.Perform the procedures in the flowchart lsee page 22-12).
Ay'C system does not come on (compressor and fan),Perform the procedures in the flowchan (see page 22-17).
Both heater and A,/C do not work.. '96 - 98 models-Perform the procedures in the flowchart
{see page 21-18).. '99 - 00 models-Perform the procedures in the flowchart(see page 21-35).
22-8

Condenser Fan
CONDENSER FAN RELAY 4P SOCKET
JUMPERwlRE
(cont'd)
22-9
Conden3er fan does not run at all.
Check the No. 56 (20 A) fuse in the
unde.hood frJse/relaY box, and the
No. 17 (7.5 A) fuse in the under-
dash fuse/relay box.
Reolace the fuse{s), and techeck
Remove the condenser lan rclaY'
and test it (see page 22 21i
Replace the condensei fan relav.
Check the under-hood tus6/relaY
Measure the vohage between the
No. 2 terminalofthe condenser fan
relav 4P socket and bodv ground.
ls there battery voltage?
Check the condenser lan Powersupply circuit:Connect the No. 1 and No. 2 teF
minals of the condenser fan relay
4P socket with a jumper wire
Does the condenser fan run?To page 22-10
Io page 22 11

Troubleshooting
Condenser Fan (cont'd)
CONDENSER FAN RELAY 4P SOCKET
CONDENSEB FAN 2P CONNECTORWire side of female terminals
-=F_
l!.lI slx
@I
Check tor an opon in the wi.o:1. Disconnect the jumper wire.2. oisconnect the condenser tan2P connector.3. Check for continuity betweenthe No. 1 terminal of the con-denser fan relay 4P socket andthe No. 1 terminal of the con-denser fan 2P connector.
Rapair op6n in the wirs bgtwconthe condcnsor tan rclay and thecondgnlar fan.
ls there continuity?
Check to. en open in the wire:Check for continuity between theNo. 2 terminal ot the condenserfan 2P connector and bodyground.
Check Ior rn opon in th6 wirebctwoen the condcnser tan andbody ground, lf iho wirc ii OK,chcck for poor ground at G751.
ls there continuity?
Replaco the condense. fan motor.
22-10

Check the diode:1. Disconnect the iumPer wire
2. Remove the A/C diode from
the under hood fuse/relaY box
3. Check for current flow in both
directions between the A and
B terminals.
ls there current flow in onlY
one direction?
Chock for an open in the wire:
1. Turn the ignition switch ON(ll).
2. Measure the voltage between
the No. 2 terminal of the AJC
diode 2P socket and body
ground.
Repair opon in the wire betwe€n
the No. 17 luse and the A/c
diode.ls there battery voltage?
B()-=iFA
A/C DIOOE 2P SOCKET

Troubleshooting
Compressor
COMPRESSOR CLUTCH RELAY.P SOCKET
JUMPERWIRE
check the No. 56 (20 A) fuse in theunder'hood fuse/relay box, and theNo. 17 (7.5 A) fuse in the under,dash fuse/relay box.
Replace the fussls), and .echeck.
Remove the compressor clutchrelay, and test it {see page 22 21).
Check th6 und€r-hood tu3e/reby
Measure the voltage between theNo. 2 terminal of the compressorclutch relay 4P socket and bodyground.
Check the compressor clutchpow€r supply circuit:Connect the No. 1 and No. 2 termi-nals of the compressor clutch relay4P socket with a jumper wire.
Does the compressor clutch click?fo page 22-13
To page 22 14
22-12

Troubleshooting
Compressor lcont'dl
COMPRESSOR CLUTCH RELAY4P SOCKET
l--;l
12 |---r--]l.l3 |L-J--J
] BLK/YEL
A(v)
!
ECM/PCM CONNECTOR A I32P}
Wire side of female terminats
*Howto use the backprobe setsConnect the backprobe adapters to the stackang patch cords, andconnect the cords to a multimeter. Using the wire insulation as aguide for the contoured tip of the backprobe adapter, gently slidethe tip into the connector from the wire side until it comes in con-tact with the terminalend ofthe wire (see section 11).
Frcm page 22-12
To page 22-15
Check Ior an open in the wire;1. Disconnecl the jumper wire.2. Turn the ignition swatch ON (ll).
3. l\4easure the voltage betweenthe No. 4 terminal of the com-pressor clutch relay 4P socketand body ground.
Repair open in the wire betw€enthe No. 17 fuso and the compres-sor clutch relav.
Check for an open in the wira:1. Turn the ignition switch OFF,then reinstall the compressorclutch relay.2. Make sure the A/C switch isOFF, then turn the ignitionswitch ON (ll).
3. Using a *Backprobe Set (T/N07SAZ 0010004), measurethe voltage between the No.17 terminal oI the ECM/PCMconnector A (32P) and bodyground with the ECM/PCMconnectors connected.
Repair open in the wirc betweonthe compressor clutch relay andthe ECM/PCtvt.
ls there battery voltage?

Frcm page 22-14
Check lor an open in the wire:1. Turn the ignition switch OFF.
2. Disconnect the A/C pressure
switch 2P connector.3. Turn th ignition switch ON lll).4. Measure the voltage between
the No. 1 terminal of the AJCpressure switch 2P conneclorand body ground.
Check the A/C pressure switch:1. Turn the ignition switch OFF.
2. Check for continuity between
the No. 1 and No. 2 terminalsof the Ay'C pressure switch.
ls there continuity?
Check for A/C system ptessure.
ls the pressure within sPeci_f cations?Repair the A/C pressure Problem
A/C PRESSURE SWITCH 2P CONNECTOR
ls there battery voltage?
wire side of {emale terminals
A/C PRESSURE SWITCH
Repair open in the wire between
the condenser fan relay tnd the
A/C oressure switch.
1o page 22-16
(cont'd)
22-15

Troubleshooting
Gompressor (cont'dl
'96 -98 models:
ECM/PCM CONNECTOR C 13lPI
Wire side ot female terminals
'9!t - 00 mod.bi
ECM/PCM CONNECTOR A I32P)
Wire side ot female terminals
*How to use the backprobe setsConnect the backprobe adapters to the stacking patch cords, andconnect the cords to a multimeter. Using the wire insulation as aguide for the contoured tip of the backprobe adapter, gently slidethe tip into the connector from the wire side until it comes in con-tact with the terminal end ofthe wire {see section 11}.
From page 22-15
Check for an open in thg wire:'1. Reconnect the A"/C pressure
switch 2P connector.2. Make sure the A/C switch isOFF, then turn the ignitionswitch ON (ll).
3. Using a *Backprobe Set {T/N07SAZ - 001000A), measurethe voltage between the No. 5terminal of the ECM/PCM con-nector C (31P) and bodyground with the EcM/PcMconnectors connected ('96 -
98 models), or between theNo. 27 terminal of theECM/PCM connector A (32P)
and body ground with theECM/PCM connectors connected ('99 - 00 models).
Rapdir open in tho wi?e botwaonthe A/C pr..-ruro lwitch rnd th.ECM/PCM.
Check lor loo3e wires or ooolconnections at the ECM/PCMconnectoB A l32P) and at the A/Cpressure switch 2P connector, lfthe connections are good, substi-tute a known-good ECM/PCM,and recheck. lf the svmptom/indication goos away, repbce theoriginal ECM/PCM.
31501E91011
tat6l11E1921222321
BLU/RED
22-16

A/C System
CONDENSER FAN RELAY 4P SOCKET
A/C system does not come on
{comDressor and fan).
Check the No. 56 fuse in theunder'hood fuse/relay box andthe No. 17 fuse in the under-dashfuse/relay box.
ReDlace the fus6{s}, and recheck.
Check for tn open in the wire:
1. Remove the condenser lanrelay from the u nderhood
luse/relay box.2. Turn the ignition switch ON {lli.3- Measure the voltage betweenthe No. 4 terminal of the condenser fan relav 4P socketand body ground.
Repair open in the wire between
the No. 17 fuse and the con-denser fan r6lay,
Check the under-hood fus€/r6laybox:Measure the voltage between the
No. 2 terminal of the condenser
fan relay 4P socket and bodyground,
YES
Io page 22-18
(cont'd)

Troubleshooting
A/C System (cont'd)
From page 22-11
. _Ff,, __
I11213[
,r,il*"-T",-.r-'..owrRE I
To page 22-19 1'96 - 98 models)
A/C THERMOSTAT 3P CONNECTOR
Wire side oI female terminals
Check tor an open in the wire:1. Turn the ignition switch OFF.2. Disconnect the A/C thermostat 3P connector.3. Turn the ignition switch ON (ll).
4. Measure the voltage betweenthe No. 3 terminal of the Ay'Cthermostat 3P connector andbody ground.
Repai. open in the wire betweentho No. 17 tuso and the A/C the.-mostat.
Check loi an open in the wi.e:Measure the voltage between theNo. 1 terminal of the A,/C thermostat 3P connector and bodyground,
Ropair open in the wire betwoenthe condedlo. lan rolay and theA/C thormostat.
ls there battery voltage?
Check the A/C th6rmostat:1. Turn the ignition switch OFF.2. Reconnect the A,/C thermostat3P connector.3. Connect the No. 2 terminal toground with a iumperwire.4. Start the engine.
Do the fan run and the com-pressor clutch engage?
To page 22-20 ('99 - 00 models)
22-18