Dtc 23: Engine Speed Signal - Honda S2000 Service Manual

DTC 23: Engine Speed Signa
NOTE: lf the MIL indicator is on, troubleshootthe PGM-
Fl problem first,
1. Start the engine and check the tachometer.
ls the tachometer working correctly?
YES Go to step 2.
NO Go to step 5.
2. Connect a commercially available spring scale to
the steering wheel.
3. Pull on the scale to measure when the front wheels
start to move. lf the system is in good condition,
the scale should read no more than 34 N {3.5 kgf,
1 .7 tbt).
]t
ls the measurement within the specification?
YES The system is OK at this time.I
NO - Go to step 4.
Test-drive the vehicle with the vehicle above 6.2
m p h ( 1 0 k m / h ) .
Does EPS provide power assist?
YES Go to step 5.
NO Perform the troubleshooting for DfC 22.a
Turn the ignition switch OFF.
Oisconnect EPS control unit connector B (14P).
Start the engine.
5 .
6 .
7 .
9 .
1 0 .
1 1 .
8. lvleasure the voltage between the No. 5 terminal
and body ground.
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YES Check for loose EPS control unit connectors.
lf necessary, substitute a known-good EPS control
unit and recheck.l
NO Go to step 9.
Turn the ignition switch OFF.
Disconnect ECM connector A (32P).
Check for continuity between EClvl connector
t e r m i n a l A ' 1 9 a n d E P S c o n t r o l u n i t ( 1 4 P ) c o n n e c t o r
t e r m i n a l N o . 5 .
ls there continuity?
YES Go to step 12.
NO - Repair the open in the wire between the EPS
control unit and the ECM.I
12. Disconnect gauge assembly connector C (20P).
13. Check for continuity between EPS control unit
connector terminal No. 5 and body ground.
ls thete continuity?
YES - Repair the short in the wire between the EPS
c o n t r o l u n i t a n d t h e E C M . I
NO Check for loose EPS control unit connectors. lf
necessary, substitute a known-good EPS control
u n i t a n d r e c h e c k . I
17-37