Honda Civic 2002-2003 Service Manual page 804

8. Connect the No.4 terminal of heater control
connector A 114PI to body ground with a jumper
wire.
HEATER CONTROL PANEL CONNECTOR A (14PI
JUMPER WIRE
=
Wire side offemale terminals
Does the AlC system come on?
YES- Replace the heater control panel..
NO-Refer to the multiplex control system Isee
page 22-168) .•
9. Using the 8ackprobe Set, connect the No.9
terminal of under-dash fuse/relay box connector
F 112PI to body ground with a jumper wire.
UNDER-DASH FUSE/RELAY BOX CONNECTOR F (12PI
BLU/WHT
JUMPER
WIRE
=
Wire side offemale terminals
Does the AlC system come on?
YES-Go to step 10.
NO- Refer to the multiplex control system Isee
page 22-1681 .•
NOTE: Check for multiplex codes in mode 1. Follow
the troubleshooting for any codes found. If no
codes are found, subsititute a known-good
multiplex control unit and a ECM one at a time.
10. Disconnect the
Ale
pressure switch 2P connector
and under-dash fuse/relay box connector F 112PI.
11. Check for continuity between the No.2 terminal of
the
Ale
pressure switch 2P connector and the No.9
terminal of under-dash fuse relay box connector
F 112P).
Ale
PRESSURE SWITCH 2P CONNECTOR
Wire side of female terminals
UNDER-DASH FUSE/RELAY BOX CONNECTOR F (12P)
Wire side of female terminals
Is there continuity?
YES-Go to step 12.
NO-Repair open in the wire between the
under-dash fuse/relay box and the
NC
pressure
switch .•
12. Check for continuity between the No.1 and No.2
terminals ofthe
Ale
pressure switch.
Ale
PRESSURE SWITCH
Is there continuity?
YES-Repair open in the wire between the heater
control panel and the
NC
pressure switch .•
NO-Go to step 13.
13. Check for proper
NC
system pressure.
Is the pressure within specifications?
YES-Replace the
NC
pressure switch .•
NO- Repair the
NC
pressure problem .•
21-33