62-11389
7−77
Alarm
NO.
Steps Alarm/Cause Corrective Action
P151 CHECK GLOW PLUG CIRCUIT (This applies to the Intake Air Heater)
• TRIGGER–ON: Normal Amps for the Intake Air Heater Circuit is 23 to 75 Amps after 15 seconds.
The circuit tests outside this 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.
Check glow plug circuit - refer to procedure for alarm 40
P152 CHECK FUEL SOLENOID CIRC
• TRIGGER–ON: Normal Amps for the Fuel Solenoid Hold Circuit is 0.2 to 4.5 Amps (including
possible electric fuel pump). The circuit tests outside this range.
• UNIT CONTROL: Alarm Only
• RESET CONDITION: Auto Reset if Pretrip 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 for bad F2 or F3 fuse alarm
Check for alarm 71 Alarm conditions must be corrected and the alarm
cleared to continue.
2 Check fuel and speed actuator (FSA)
a. Check resistance of FSA Refer to Section 2.12.
b. Check amp draw between MPQC4
& terminal 13 of the ENSCU.
Use Component Test Mode (Section 5.2.2) to test.
Refer to Section 2.12 for amp values.
3 Check FSA & circuits
a. Inspect FSA and wiring No physical damage to harness.
No damaged or corroded pins
No damage to component
b. Check operation of Run Relay With microprocessor powered, see Note 2. LED 28
must be ON.
c. Check voltage to FSA With microprocessor powered, see Note 2. OR
component test mode, 12 VDC between engine
speed control unit (ENSCU) pins 13 and 19.
With Main Power switch not in the OFF position, 12
VDC between ENSCU pins 24 and 19.
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