John Deere 318 User Manual
Page 339
Ü
SEAT SWITCH TEST
FOR IGNITION TIME
DELAY
Key switch OFF.
M37289 -UN-25JAN90
Check the black leads
(A) of the TDC 2-pin
connector for good
ground.
GOOD GROUND:
Replace TDC module,
then GO TO
;
, Group
05.
POOR GROUND:
Clean and tighten all
ground connections
then GO TO
Ü
, Group
05.
1Ô
HOUR METER
CIRCUIT TEST
Check fuses.
Put jumper wire across
seat switch terminals.
Key switch OFF.
M77934 -UN-19JAN95
Check for continuity
between terminal with
two black wires (A) and
ground.
Turn key switch to RUN
position.
Check for voltage at
terminal with orange
wire (B).
CONTINUITY AND
VOLTAGE OK: Replace
hour meter.
NO CONTINUITY:
Black wire from hour
meter to ground is
open.
NO VOLTAGE: Check
if orange wire to TDC
8-pin connector is
open. If ok, GO TO
3k
MX,159024025,75-19-16MAY95
MX,159024025,76-19-16MAY95
Electrical System Diagnosis/Hour Meter Circuit Test
TM1590 (17MAY95)
240-20-27
316, 318 & 420 Lawn and Garden Tractors
020895
240
20
27