62-11637 7–22
00040 CHECK ENGINE PREHEAT CIRCUIT
• ACTIVATION: Engine preheater amperage is less than 70 Amps with heater activated.
NOTE
This alarm can only occur when the preheat time is greater than 14 seconds. Refer to Table 4–1 for
preheat times.
• UNIT CONTROL: Alarm Only
• RESET CONDITION: Auto reset if amperage is greater than 70 amps for at least 14 seconds during the
preheat cycle, or alarm may be manually reset using the display mounted keys 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, the active
alarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Check for Alarm 05017 (CHECK GLOW PLUG RELAY)
Check for Alarm 05017 CHECK GLOW PLUG RELAY. 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 dis-
played amp draw, must be greater than 70 amps.
NOTICE
DO NOT leave the air intake circuit energized for the full 5 minutes if full amperage is shown,
as the intake air heater element life will be greatly shortened.
b. Check for power at PCM-T4 and EPH +. Must have minimum 11 VDC. If not, check connectors and
wiring between terminals for damage, moisture or corrosion.
c. Replace PCM with known good component.
3. Check Engine Preheater Circuit
Check resistance of EPH. Refer to Section 2.7 for specifications.
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