Check Engine Preheat Circuit
engine
Description
After 14 seconds of glow time, intake air heater amperage was under 25 Amps or over 70 Amps, and the unit gives an alarm only.
Activation Conditions
Engine Operation: Intake Air Heater amperage is less than 25 Amps, or greater than 70 Amps after 14 seconds of glow time (NOTE: This can only occur when the Engine Coolant Temperature is below 50°F (11°C) due to preheat time allowed. Refer to Table 4–1 for preheat times. Electric Operation: This alarm will not activate in Electric Operation.
Unit Behavior
Engine and Electric Operation: Alarm Only
Reset Conditions
Auto Reset if amperage is between 4 to 55 amps for at least 14 seconds during the glow cycle, or alarm may be manually reset via keypad or by turning the unit off, then back on again.
Corrective Actions
1. Check for Alarm 05017 Check Engine Preheat Enable Circuit - Alarm conditions must be corrected and the alarm cleared to continue. 2. Check Engine Preheater Circuit a. Using Component Test mode, refer to Section 5.2.4, energize engine preheat circuit. Check displayed amp draw, must be greater than 70 amps. NOTICE DO NOT leave the air intake circuit energized for the full five minutes if full amperage is shown, as the intake air heater element life will be greatly shortened. b. Check for power at GP/EPH+ and EPH +. Must have minimum 11 VDC. If not, check connectors and wiring between terminals for damage, moisture or corrosion. c. Download data, replace Power Module, and upload latest software. 3. Check Engine Preheater Circuit - Check resistance of EPH. Refer to Section 2.7 for specifications.