7
−
76
62-11389
Alarm
NO.
Steps
Alarm/Cause
Corrective Action
P145 CHECK SPEED SOL CIRCUIT
•
TRIGGER–ON: Normal Amps for the Speed Solenoid Circuit is 0 to 1.0 Amps. The circuit tests out-
sidethis range.
•
UNIT CONTROL: Alarm Only
•
RESET CONDITION: Auto Reset if Pretrip is started again or alarm may be manually reset via
keypad or by turning the unit off then back on again.
1
Check For Bad F2 Or F3 Fuse Alarm
Check for Alarm 71.
Alarm conditions must be corrected and the alarm
cleared to continue.
2
Check Speed Circuit To ENSCU And FSA
a. Check voltage to ENSCU and amp
draw of engine speed control circuit
(ENSCU) pin 16 and MPQC3 on the
microprocessor.
Use Component Test mode to energize the Speed
Relay. (Section 5.2.2)
Refer to Section 2.12 for amp values.
View current draw in the Unit Data. (Refer to Section
3.13).
Check voltage at ENSCU16 and ground. Must be 11
VDC or higher.
b. Check operation of Speed Relay
LED
LED 27 must be ON when the Speed Relay is ON in
component Test Mode.
3
Check Engine Speed Control Unit (ENSCU)
a.Check resistance of FSA
Refer to Section 2.12. With FSA unplugged, ohm
spec is 3 to 4 ohms,
$
10%.
b. Inspect ENSCU and wiring
No physical damage to harness.
No damage, moisture, or corrosion in connectors.
No damage to ENSCU
4
Check ENSCU Circuit Wiring
Inspect harness & control box con-
nector pins & terminals (See wiring
schematic)
No physical damage to harness.
No damage, moisture, or corrosion in connectors.
