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CHECK GLOW PLUG RELAY
• ACTIVATION: A problem has been detected in the engine preheat enable circuit (EPHT). If this alarm is
activated when the circuit is energized, the circuit is detected shorted. If this alarm is activated at any other
time, the circuit is detected open.
• UNIT CONTROL: Alarm only.
• RESET CONDITION: Auto reset when circuit is normal, 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 EPHT Wiring
Inspect 3MM and PCM connectors. Verify there is no damage to modules, and no damage, moisture,
or corrosion in connector.
2.
Check Engine Preheat Enable Circuit
a. Using Component Test Mode, refer to
, energize engine preheat circuit. Verify the cir-
cuit is energized and amp draw is displayed.
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 3MM-14 Must have minimum 11 VDC. If not, download data and replace main
microprocessor. For complete Main Microprocessor Module replacement instructions refer to
c. Check for power at PCM
−
27. Must have minimum 11 VDC. If not, check wiring and connectors
between 3MM
−
14 and PCM
−
27. Good continuity, no damage, moisture, or corrosion in connectors.
d. Replace PCM. Refer to
3. Is the component functioning? Are there additional alarms?
a. If the component is functioning, and additional alarms are present (often within 3MM01 - 3MM12 or
3MM13 - 3MM18) check related fuses, wires, and connectors.
b. If the fuses/wires/connectors are OK, it indicates an internal problem with the MM or the PCM.
Download data and replace main microprocessor. For complete Main Microprocessor Module
replacement instructions refer to
.
c. If problem persists reinstall the old MM, and replace the PCM. Refer to
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