Carrier VECTOR 1800 MT, Operation & Service Manual

Page: 208 / 315

62-11039 7-77
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
P157 CHECK BATTERY CURRENT
• TRIGGER–ON: With all circuits off current flow of more than 1.5 amps is detected in the electrical
circuits.
NOTE: If this alarm occurs, pre--trip Test #2 will not be performed. You will need to run pre--trip
again again.
• UNIT CONTROL: Engine and standby operation: pre--trip will fail and display “PRE--TRIP FAIL AND
COMPLETED”.
• RESET CONDITION: Auto Reset if pre--trip mode is started again, or alarm may be manually reset via
keypad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (See Note 1) Operate the unit through the appropriate modes to see if any active alarm occurs. Continue
with the steps below as necessary.
1. Check Battery Current Draw.
a. Observe current draw on
microprocessor display. (See Note 3)
Must show plus or minus 0.2 amps
2. Check No Load Current Draw
a. Check current draw at 12 VDC current
sensor at micro
Energize circuit (see Note 2)
b. Check micro current reading with no
load
Remove wire from inside current sensor and check current
draw in Unit Data List. Must be less than 1.0 Amp
3. Check Individual Circuits
a. Isolate individual circuits and test amp
draw
Must be in range. (Refer to Section 2.14)
P158 CHECK AMBIENT AIR SENSOR
• TRIGGER–ON: Ambient Air Sensor is not within the maximum range of --53
°
F to +158
°
F (--47
°
C to
+70
°
C)
•
UNIT CONTROL: Engine and standby operation: pre trip will fail and display “PRE TRIP FAIL AND
•
UNIT CONTROL: Engine and standby operation: pre--trip will fail and display “PRE--TRIP FAIL AND
COMPLETED”.
• RESET CONDITION: Auto Reset if pre--trip mode is started again, or alarm may be manually reset via
keypad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (See Note 1) Operate the unit through the appropriate modes to see if any active alarm occurs. Continue
with the steps below as necessary.
1. Check Ambient Air Sensor
a. Inspect Ambient Air Sensor &
connector
No damage to sensor
No moisture, damage or corrosion in connector
b. Check Ambient Air Sensor resistance
(See Note 4)
10,000 Ohms @ 77
°
F (25
°
C) [See manual for complete
table of temperatures and resistance values.]
2. Check Ambient Air Sensor Wiring
a. Inspect harness & control box
connector pins & terminals (See
wiring schematic)
No physical damage to harness.
No damaged or corroded pins
3. Check Ambient Air Sensor Connector
a.Locate and inspect remote sensor
connector
Cap is in place.
No physical damage.
No moisture or corrosion.