Honda Civic Service Manual page 935

Troubleshooting Flowchart - TMA and TMB Signals
NOTE: Record all freeze data before you troubleshoot'
Possible Cause
. S h o r l o r o p . n i n T M A w i . o
botwo6n 87 terminal and ECM
. S h o r t o r o p e n i n T M B w i r o
bdtwoon BG to.min.l .nd ECM
. F.ulty ECM
. Faulty TCM
TCM CONNECTOR B (22P)
GRY
Wire side oI temale terminals
o
I
2
a 5
8 9 1 0
1 2
1 3 1 1 1 5 1 6 1 7 1 8
20
GRY
ECM CONNECTOR C 13lPI
1
2 3
a
5 6
l 8
9 r 0
1 112
t 3
l a
16
1 8
/ /
29130 /
::)
I
2
a
5 6
8 9 1 0
12 t 3
1 4 1 5 1 6 1 7 1 8
20
. OBD ll Scsn Tool indicate3 Codo
P1655.
. Self-diagnosb E indicator light
indicales Cod6 37.
Check TMA Wire Continuity:
1. Turn the ignition switch OFF.
2- Disconnect the I (22P) con-
nector lrom the TCM
3 . D i s c o n n e c t t h e c ( 3 1 P ) c o n '
nector from the ECM
4. Check for continuity between
t h e 8 7 t e r m i n a l o f t h e T C M
a n d t h e C g t e r m i n a l o I t h e
E C M ,
Ropail open in the wire betwcen
the TCM and the ECM.
Check TMA Wir€ for a Short Cir-
cuit:
Check for continuity between the
87 terminal of the TCM or the Cg
t e r m i n a l o l t h e E C M a n d b o d y
ground.
check rhe EcM:
1 . R e c o n n e c t t h e C ( 3 1 P ) c o n '
nector to lhe ECM, and the B
(22P) connector to the TCM
2. Turn the ignition switch ON (ll).
3. Measure the voltage between
t h e C 9 t e r m i n a l o I t h e E C M
and body ground.
Chock tor loose ECM connectors.
lf nscossary, subdituta a known'
good ECM .nd lecheck.
ls there approx. 10 V?
To page 14 258
(cont'd)
14-257