(c) If signal is correct, proceed to
If correct, proceed to Gear Selector Input
Check that socket 8 (full throttle
If rpm is less than range, check throttle
switch input) has 24 vDC signal
cable and throttle assembly for proper
at idle and drops out when
installation, Refer to THROTTLE AIR
engine reaches 2250-2350 rpm.
CYLINDER AND THROTTLE LINKAGE
Installation procedures, Section 2.
(a) If signal is not present or
does not drop out, check full
Gear Selector Input Diagnostics
throttle switch. Switch should
be closed until rpm setting is
Disconnect relay box harness (rectangular
connector) from APC 100 control box.
Position ignition switch to 1 (run).
(b) If signal drops out at wrong
rpm setting, adjust full throttle
Place transmission shift lever in each position
switch by slightly loosening
and check input signals (voltages) at sockets 1, 2,
the mounting screws (33,
20, 21, and 22 for 24 vDC or 0 v. Readings should
screw (36) clockwise to
decrease rpm setting and
If all input signals are correct, proceed to
counterclockwise to increase
Speed Sender Input Diagnostics.
setting. Correct and recheck
If input signals are incorrect, check the
APC fuse and relay box for faults
between the manual mode relays and
APC 100 harness connector. Faults in
A slight reduction in rpm setting usually
the rest of the relay box would create
occurs as mounting screws are
Therefore, adjust toward
operation and would be detected during
upper end of rpm range.
that diagnosis. Correct any fault(s) and
Check maximum engine RPM by increasing
engine speed to full throttle (2500-2800 rpm).
(Voltages) to APC 100
SOCKET ID (RELAY
TRANSMISSION SHIFT LEVER POSITION