62-11389
7
−
79
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 12 VDC
electrical circuits.
NOTE
: If this alarm occurs, Pretrip Test #2 will not be performed. You will need to run
pretrip again.
•
UNIT CONTROL:
Engine and Standby Operation: Pretrip will fail and display
“PRETRIP FAIL AND COMPLETED”.
•
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.
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 page 7
−
2.) Operate the unit through the appropriate modes to see if any active alarm
occurs. Continue with the steps below as necessary.
1
Check No Load Current Draw
a. Energize circuit (refer to Note 2
page 7
−
2). Observe current draw
on microprocessor display.
Reading is less than 1.5 Amps.
b. Disconnect F5 wire and remove
from inside DC current sensor (see
Figure 2
−
9, page 2
−
12). Reconnect
at F5 and power the microprocessor
by toggling the Main Power switch
out of the OFF position.
Without wire in sensor, reading should be 0 +/- 1
amp.
NOTE: Ensure wire is rerouted through sensor prior
to returning unit to service.
2
Check Individual Circuits
Isolate individual circuits and test
amp draw.
Must be in range. (Refer to Section 2.12 for correct
electrical values.)
3
Check for parasitic loads.
Check for electrical loads that are
drawing current with all circuits OFF
Check for non-factory installed devices such as lift
gates, inside lights, satellite systems, etc. These
devices must be wired so as to not draw current
during Pretrip testing.
P158 CHECK AMBIENT AIR SENSOR
•
TRIGGER–ON: Ambient Air Temperature Sensor (AAT) is not within the range of -53 to +158
°
F
(-47 to +70
°
C.)
•
UNIT CONTROL:
Engine and Standby Operation: Pretrip will fail and display
“PRETRIP FAIL AND COMPLETED”.
•
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.
Check Sensor - refer to procedure for alarm 121
