Electrical Power Steering (Eps) Signal Circuit Troubleshooting - Honda Civic 2002-2003 Service Manual

•
•
•
15. Check for continuity between body ground and
ECM connector terminal 813.
Q
ECM CONNECTOR B (24PI
17 18
ALTF
(WHT/RED)
6 7
15
21 23
Wire side of female terminals
Is there continuity?
YES-Repair short in the wire between the ECM
(813) and the alternator .•
NO-Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). If the symptom/indication
goes away with a known-good ECM, replace the
original ECM .•
Electrical Power Steering (EPS)
Signal Circuit Troubleshooting
1. Turn the ignition switch ON (III.
2. Measure voltage between ECM connector
terminals A24 and E 1 6.
ECM CONNECTORS
A
(31P)
1 2
I
314 5 6 7lJ/ 9
10
11112VV
15 16 VI18119 20 21
22 231241
~
2712812930V
LG1 (BRN/YEL)
I
E (31P)
t
I
2 1314
5 6
71
8 9
/ /VV114
15 16 V118/120 21
22231241
~
271/129130 31
EPSLD
(L T GRN/BLK)
Wire side of female terminals
Is there battery voltage?
YES-Go to step 6 .
NO-Go to step 3.
3. Start the engine.
4. Turn the steering wheel to the full lock position.
5. Measure voltage between ECM connector
terminals A24 and E16.
Is there momentary battery voltage?
YES- The EPS signal is OK .•
NO-Goto step 10.
6. Turn the ignition switch OFF.
7.
Disconnect the EPS control unit 20P connector.
8. Turn the ignition switch ON (II) .
(cont'd)
11-135